| /* |
| * |
| * Copyright 2015, Google Inc. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following disclaimer |
| * in the documentation and/or other materials provided with the |
| * distribution. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| * |
| */ |
| |
| /* This file will be removed shortly: it's here to keep refactoring |
| * steps simple and auditable. |
| * It's the combination of the old files: |
| * - fd_posix.{h,c} |
| * - pollset_posix.{h,c} |
| * - pullset_multipoller_with_{poll,epoll}.{h,c} |
| * The new version will be split into: |
| * - ev_poll_posix.{h,c} |
| * - ev_epoll_posix.{h,c} |
| */ |
| |
| #include <grpc/support/port_platform.h> |
| |
| #ifdef GPR_POSIX_SOCKET |
| |
| #include "src/core/lib/iomgr/ev_poll_and_epoll_posix.h" |
| |
| #include <assert.h> |
| #include <errno.h> |
| #include <poll.h> |
| #include <string.h> |
| #include <sys/socket.h> |
| #include <unistd.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/tls.h> |
| #include <grpc/support/useful.h> |
| |
| #include "src/core/lib/iomgr/iomgr_internal.h" |
| #include "src/core/lib/iomgr/wakeup_fd_posix.h" |
| #include "src/core/lib/profiling/timers.h" |
| #include "src/core/lib/support/block_annotate.h" |
| |
| /******************************************************************************* |
| * FD declarations |
| */ |
| |
| typedef struct grpc_fd_watcher { |
| struct grpc_fd_watcher *next; |
| struct grpc_fd_watcher *prev; |
| grpc_pollset *pollset; |
| grpc_pollset_worker *worker; |
| grpc_fd *fd; |
| } grpc_fd_watcher; |
| |
| struct grpc_fd { |
| int fd; |
| /* refst format: |
| bit0: 1=active/0=orphaned |
| bit1-n: refcount |
| meaning that mostly we ref by two to avoid altering the orphaned bit, |
| and just unref by 1 when we're ready to flag the object as orphaned */ |
| gpr_atm refst; |
| |
| gpr_mu mu; |
| int shutdown; |
| int closed; |
| int released; |
| |
| /* The watcher list. |
| |
| The following watcher related fields are protected by watcher_mu. |
| |
| An fd_watcher is an ephemeral object created when an fd wants to |
| begin polling, and destroyed after the poll. |
| |
| It denotes the fd's interest in whether to read poll or write poll |
| or both or neither on this fd. |
| |
| If a watcher is asked to poll for reads or writes, the read_watcher |
| or write_watcher fields are set respectively. A watcher may be asked |
| to poll for both, in which case both fields will be set. |
| |
| read_watcher and write_watcher may be NULL if no watcher has been |
| asked to poll for reads or writes. |
| |
| If an fd_watcher is not asked to poll for reads or writes, it's added |
| to a linked list of inactive watchers, rooted at inactive_watcher_root. |
| If at a later time there becomes need of a poller to poll, one of |
| the inactive pollers may be kicked out of their poll loops to take |
| that responsibility. */ |
| grpc_fd_watcher inactive_watcher_root; |
| grpc_fd_watcher *read_watcher; |
| grpc_fd_watcher *write_watcher; |
| |
| grpc_closure *read_closure; |
| grpc_closure *write_closure; |
| |
| struct grpc_fd *freelist_next; |
| |
| grpc_closure *on_done_closure; |
| |
| grpc_iomgr_object iomgr_object; |
| |
| /* The pollset that last noticed and notified that the fd is readable */ |
| grpc_pollset *read_notifier_pollset; |
| }; |
| |
| /* Begin polling on an fd. |
| Registers that the given pollset is interested in this fd - so that if read |
| or writability interest changes, the pollset can be kicked to pick up that |
| new interest. |
| Return value is: |
| (fd_needs_read? read_mask : 0) | (fd_needs_write? write_mask : 0) |
| i.e. a combination of read_mask and write_mask determined by the fd's current |
| interest in said events. |
| Polling strategies that do not need to alter their behavior depending on the |
| fd's current interest (such as epoll) do not need to call this function. |
| MUST NOT be called with a pollset lock taken */ |
| static uint32_t fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset, |
| grpc_pollset_worker *worker, uint32_t read_mask, |
| uint32_t write_mask, grpc_fd_watcher *rec); |
| /* Complete polling previously started with fd_begin_poll |
| MUST NOT be called with a pollset lock taken |
| if got_read or got_write are 1, also does the become_{readable,writable} as |
| appropriate. */ |
| static void fd_end_poll(grpc_exec_ctx *exec_ctx, grpc_fd_watcher *rec, |
| int got_read, int got_write, |
| grpc_pollset *read_notifier_pollset); |
| |
| /* Return 1 if this fd is orphaned, 0 otherwise */ |
| static bool fd_is_orphaned(grpc_fd *fd); |
| |
| /* Reference counting for fds */ |
| /*#define GRPC_FD_REF_COUNT_DEBUG*/ |
| #ifdef GRPC_FD_REF_COUNT_DEBUG |
| static void fd_ref(grpc_fd *fd, const char *reason, const char *file, int line); |
| static void fd_unref(grpc_fd *fd, const char *reason, const char *file, |
| int line); |
| #define GRPC_FD_REF(fd, reason) fd_ref(fd, reason, __FILE__, __LINE__) |
| #define GRPC_FD_UNREF(fd, reason) fd_unref(fd, reason, __FILE__, __LINE__) |
| #else |
| static void fd_ref(grpc_fd *fd); |
| static void fd_unref(grpc_fd *fd); |
| #define GRPC_FD_REF(fd, reason) fd_ref(fd) |
| #define GRPC_FD_UNREF(fd, reason) fd_unref(fd) |
| #endif |
| |
| static void fd_global_init(void); |
| static void fd_global_shutdown(void); |
| |
| #define CLOSURE_NOT_READY ((grpc_closure *)0) |
| #define CLOSURE_READY ((grpc_closure *)1) |
| |
| /******************************************************************************* |
| * pollset declarations |
| */ |
| |
| typedef struct grpc_pollset_vtable grpc_pollset_vtable; |
| |
| typedef struct grpc_cached_wakeup_fd { |
| grpc_wakeup_fd fd; |
| struct grpc_cached_wakeup_fd *next; |
| } grpc_cached_wakeup_fd; |
| |
| struct grpc_pollset_worker { |
| grpc_cached_wakeup_fd *wakeup_fd; |
| int reevaluate_polling_on_wakeup; |
| int kicked_specifically; |
| struct grpc_pollset_worker *next; |
| struct grpc_pollset_worker *prev; |
| }; |
| |
| struct grpc_pollset { |
| /* pollsets under posix can mutate representation as fds are added and |
| removed. |
| For example, we may choose a poll() based implementation on linux for |
| few fds, and an epoll() based implementation for many fds */ |
| const grpc_pollset_vtable *vtable; |
| gpr_mu mu; |
| grpc_pollset_worker root_worker; |
| int in_flight_cbs; |
| int shutting_down; |
| int called_shutdown; |
| int kicked_without_pollers; |
| grpc_closure *shutdown_done; |
| grpc_closure_list idle_jobs; |
| union { |
| int fd; |
| void *ptr; |
| } data; |
| /* Local cache of eventfds for workers */ |
| grpc_cached_wakeup_fd *local_wakeup_cache; |
| }; |
| |
| struct grpc_pollset_vtable { |
| void (*add_fd)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| struct grpc_fd *fd, int and_unlock_pollset); |
| void (*maybe_work_and_unlock)(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_pollset_worker *worker, |
| gpr_timespec deadline, gpr_timespec now); |
| void (*finish_shutdown)(grpc_pollset *pollset); |
| void (*destroy)(grpc_pollset *pollset); |
| }; |
| |
| /* Add an fd to a pollset */ |
| static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| struct grpc_fd *fd); |
| |
| static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, grpc_fd *fd); |
| |
| /* Convert a timespec to milliseconds: |
| - very small or negative poll times are clamped to zero to do a |
| non-blocking poll (which becomes spin polling) |
| - other small values are rounded up to one millisecond |
| - longer than a millisecond polls are rounded up to the next nearest |
| millisecond to avoid spinning |
| - infinite timeouts are converted to -1 */ |
| static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| gpr_timespec now); |
| |
| /* Allow kick to wakeup the currently polling worker */ |
| #define GRPC_POLLSET_CAN_KICK_SELF 1 |
| /* Force the wakee to repoll when awoken */ |
| #define GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP 2 |
| /* As per pollset_kick, with an extended set of flags (defined above) |
| -- mostly for fd_posix's use. */ |
| static void pollset_kick_ext(grpc_pollset *p, |
| grpc_pollset_worker *specific_worker, |
| uint32_t flags); |
| |
| /* turn a pollset into a multipoller: platform specific */ |
| typedef void (*platform_become_multipoller_type)(grpc_exec_ctx *exec_ctx, |
| grpc_pollset *pollset, |
| struct grpc_fd **fds, |
| size_t fd_count); |
| static platform_become_multipoller_type platform_become_multipoller; |
| |
| /* Return 1 if the pollset has active threads in pollset_work (pollset must |
| * be locked) */ |
| static int pollset_has_workers(grpc_pollset *pollset); |
| |
| static void remove_fd_from_all_epoll_sets(int fd); |
| |
| /******************************************************************************* |
| * pollset_set definitions |
| */ |
| |
| struct grpc_pollset_set { |
| gpr_mu mu; |
| |
| size_t pollset_count; |
| size_t pollset_capacity; |
| grpc_pollset **pollsets; |
| |
| size_t pollset_set_count; |
| size_t pollset_set_capacity; |
| struct grpc_pollset_set **pollset_sets; |
| |
| size_t fd_count; |
| size_t fd_capacity; |
| grpc_fd **fds; |
| }; |
| |
| /******************************************************************************* |
| * fd_posix.c |
| */ |
| |
| /* We need to keep a freelist not because of any concerns of malloc performance |
| * but instead so that implementations with multiple threads in (for example) |
| * epoll_wait deal with the race between pollset removal and incoming poll |
| * notifications. |
| * |
| * The problem is that the poller ultimately holds a reference to this |
| * object, so it is very difficult to know when is safe to free it, at least |
| * without some expensive synchronization. |
| * |
| * If we keep the object freelisted, in the worst case losing this race just |
| * becomes a spurious read notification on a reused fd. |
| */ |
| /* TODO(klempner): We could use some form of polling generation count to know |
| * when these are safe to free. */ |
| /* TODO(klempner): Consider disabling freelisting if we don't have multiple |
| * threads in poll on the same fd */ |
| /* TODO(klempner): Batch these allocations to reduce fragmentation */ |
| static grpc_fd *fd_freelist = NULL; |
| static gpr_mu fd_freelist_mu; |
| |
| static void freelist_fd(grpc_fd *fd) { |
| gpr_mu_lock(&fd_freelist_mu); |
| fd->freelist_next = fd_freelist; |
| fd_freelist = fd; |
| grpc_iomgr_unregister_object(&fd->iomgr_object); |
| gpr_mu_unlock(&fd_freelist_mu); |
| } |
| |
| static grpc_fd *alloc_fd(int fd) { |
| grpc_fd *r = NULL; |
| gpr_mu_lock(&fd_freelist_mu); |
| if (fd_freelist != NULL) { |
| r = fd_freelist; |
| fd_freelist = fd_freelist->freelist_next; |
| } |
| gpr_mu_unlock(&fd_freelist_mu); |
| if (r == NULL) { |
| r = gpr_malloc(sizeof(grpc_fd)); |
| gpr_mu_init(&r->mu); |
| } |
| |
| gpr_mu_lock(&r->mu); |
| gpr_atm_rel_store(&r->refst, 1); |
| r->shutdown = 0; |
| r->read_closure = CLOSURE_NOT_READY; |
| r->write_closure = CLOSURE_NOT_READY; |
| r->fd = fd; |
| r->inactive_watcher_root.next = r->inactive_watcher_root.prev = |
| &r->inactive_watcher_root; |
| r->freelist_next = NULL; |
| r->read_watcher = r->write_watcher = NULL; |
| r->on_done_closure = NULL; |
| r->closed = 0; |
| r->released = 0; |
| r->read_notifier_pollset = NULL; |
| gpr_mu_unlock(&r->mu); |
| return r; |
| } |
| |
| static void destroy(grpc_fd *fd) { |
| gpr_mu_destroy(&fd->mu); |
| gpr_free(fd); |
| } |
| |
| #ifdef GRPC_FD_REF_COUNT_DEBUG |
| #define REF_BY(fd, n, reason) ref_by(fd, n, reason, __FILE__, __LINE__) |
| #define UNREF_BY(fd, n, reason) unref_by(fd, n, reason, __FILE__, __LINE__) |
| static void ref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
| int line) { |
| gpr_log(GPR_DEBUG, "FD %d %p ref %d %d -> %d [%s; %s:%d]", fd->fd, fd, n, |
| gpr_atm_no_barrier_load(&fd->refst), |
| gpr_atm_no_barrier_load(&fd->refst) + n, reason, file, line); |
| #else |
| #define REF_BY(fd, n, reason) ref_by(fd, n) |
| #define UNREF_BY(fd, n, reason) unref_by(fd, n) |
| static void ref_by(grpc_fd *fd, int n) { |
| #endif |
| GPR_ASSERT(gpr_atm_no_barrier_fetch_add(&fd->refst, n) > 0); |
| } |
| |
| #ifdef GRPC_FD_REF_COUNT_DEBUG |
| static void unref_by(grpc_fd *fd, int n, const char *reason, const char *file, |
| int line) { |
| gpr_atm old; |
| gpr_log(GPR_DEBUG, "FD %d %p unref %d %d -> %d [%s; %s:%d]", fd->fd, fd, n, |
| gpr_atm_no_barrier_load(&fd->refst), |
| gpr_atm_no_barrier_load(&fd->refst) - n, reason, file, line); |
| #else |
| static void unref_by(grpc_fd *fd, int n) { |
| gpr_atm old; |
| #endif |
| old = gpr_atm_full_fetch_add(&fd->refst, -n); |
| if (old == n) { |
| freelist_fd(fd); |
| } else { |
| GPR_ASSERT(old > n); |
| } |
| } |
| |
| static void fd_global_init(void) { gpr_mu_init(&fd_freelist_mu); } |
| |
| static void fd_global_shutdown(void) { |
| gpr_mu_lock(&fd_freelist_mu); |
| gpr_mu_unlock(&fd_freelist_mu); |
| while (fd_freelist != NULL) { |
| grpc_fd *fd = fd_freelist; |
| fd_freelist = fd_freelist->freelist_next; |
| destroy(fd); |
| } |
| gpr_mu_destroy(&fd_freelist_mu); |
| } |
| |
| static grpc_fd *fd_create(int fd, const char *name) { |
| grpc_fd *r = alloc_fd(fd); |
| char *name2; |
| gpr_asprintf(&name2, "%s fd=%d", name, fd); |
| grpc_iomgr_register_object(&r->iomgr_object, name2); |
| gpr_free(name2); |
| #ifdef GRPC_FD_REF_COUNT_DEBUG |
| gpr_log(GPR_DEBUG, "FD %d %p create %s", fd, r, name); |
| #endif |
| return r; |
| } |
| |
| static bool fd_is_orphaned(grpc_fd *fd) { |
| return (gpr_atm_acq_load(&fd->refst) & 1) == 0; |
| } |
| |
| static void pollset_kick_locked(grpc_fd_watcher *watcher) { |
| gpr_mu_lock(&watcher->pollset->mu); |
| GPR_ASSERT(watcher->worker); |
| pollset_kick_ext(watcher->pollset, watcher->worker, |
| GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP); |
| gpr_mu_unlock(&watcher->pollset->mu); |
| } |
| |
| static void maybe_wake_one_watcher_locked(grpc_fd *fd) { |
| if (fd->inactive_watcher_root.next != &fd->inactive_watcher_root) { |
| pollset_kick_locked(fd->inactive_watcher_root.next); |
| } else if (fd->read_watcher) { |
| pollset_kick_locked(fd->read_watcher); |
| } else if (fd->write_watcher) { |
| pollset_kick_locked(fd->write_watcher); |
| } |
| } |
| |
| static void wake_all_watchers_locked(grpc_fd *fd) { |
| grpc_fd_watcher *watcher; |
| for (watcher = fd->inactive_watcher_root.next; |
| watcher != &fd->inactive_watcher_root; watcher = watcher->next) { |
| pollset_kick_locked(watcher); |
| } |
| if (fd->read_watcher) { |
| pollset_kick_locked(fd->read_watcher); |
| } |
| if (fd->write_watcher && fd->write_watcher != fd->read_watcher) { |
| pollset_kick_locked(fd->write_watcher); |
| } |
| } |
| |
| static int has_watchers(grpc_fd *fd) { |
| return fd->read_watcher != NULL || fd->write_watcher != NULL || |
| fd->inactive_watcher_root.next != &fd->inactive_watcher_root; |
| } |
| |
| static void close_fd_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
| fd->closed = 1; |
| if (!fd->released) { |
| close(fd->fd); |
| } else { |
| remove_fd_from_all_epoll_sets(fd->fd); |
| } |
| grpc_exec_ctx_enqueue(exec_ctx, fd->on_done_closure, true, NULL); |
| } |
| |
| static int fd_wrapped_fd(grpc_fd *fd) { |
| if (fd->released || fd->closed) { |
| return -1; |
| } else { |
| return fd->fd; |
| } |
| } |
| |
| static void fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_closure *on_done, int *release_fd, |
| const char *reason) { |
| fd->on_done_closure = on_done; |
| fd->released = release_fd != NULL; |
| if (!fd->released) { |
| shutdown(fd->fd, SHUT_RDWR); |
| } else { |
| *release_fd = fd->fd; |
| } |
| gpr_mu_lock(&fd->mu); |
| REF_BY(fd, 1, reason); /* remove active status, but keep referenced */ |
| if (!has_watchers(fd)) { |
| close_fd_locked(exec_ctx, fd); |
| } else { |
| wake_all_watchers_locked(fd); |
| } |
| gpr_mu_unlock(&fd->mu); |
| UNREF_BY(fd, 2, reason); /* drop the reference */ |
| } |
| |
| /* increment refcount by two to avoid changing the orphan bit */ |
| #ifdef GRPC_FD_REF_COUNT_DEBUG |
| static void fd_ref(grpc_fd *fd, const char *reason, const char *file, |
| int line) { |
| ref_by(fd, 2, reason, file, line); |
| } |
| |
| static void fd_unref(grpc_fd *fd, const char *reason, const char *file, |
| int line) { |
| unref_by(fd, 2, reason, file, line); |
| } |
| #else |
| static void fd_ref(grpc_fd *fd) { ref_by(fd, 2); } |
| |
| static void fd_unref(grpc_fd *fd) { unref_by(fd, 2); } |
| #endif |
| |
| static void notify_on_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_closure **st, grpc_closure *closure) { |
| if (*st == CLOSURE_NOT_READY) { |
| /* not ready ==> switch to a waiting state by setting the closure */ |
| *st = closure; |
| } else if (*st == CLOSURE_READY) { |
| /* already ready ==> queue the closure to run immediately */ |
| *st = CLOSURE_NOT_READY; |
| grpc_exec_ctx_enqueue(exec_ctx, closure, !fd->shutdown, NULL); |
| maybe_wake_one_watcher_locked(fd); |
| } else { |
| /* upcallptr was set to a different closure. This is an error! */ |
| gpr_log(GPR_ERROR, |
| "User called a notify_on function with a previous callback still " |
| "pending"); |
| abort(); |
| } |
| } |
| |
| /* returns 1 if state becomes not ready */ |
| static int set_ready_locked(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_closure **st) { |
| if (*st == CLOSURE_READY) { |
| /* duplicate ready ==> ignore */ |
| return 0; |
| } else if (*st == CLOSURE_NOT_READY) { |
| /* not ready, and not waiting ==> flag ready */ |
| *st = CLOSURE_READY; |
| return 0; |
| } else { |
| /* waiting ==> queue closure */ |
| grpc_exec_ctx_enqueue(exec_ctx, *st, !fd->shutdown, NULL); |
| *st = CLOSURE_NOT_READY; |
| return 1; |
| } |
| } |
| |
| static void set_read_notifier_pollset_locked( |
| grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_pollset *read_notifier_pollset) { |
| fd->read_notifier_pollset = read_notifier_pollset; |
| } |
| |
| static void fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
| gpr_mu_lock(&fd->mu); |
| GPR_ASSERT(!fd->shutdown); |
| fd->shutdown = 1; |
| set_ready_locked(exec_ctx, fd, &fd->read_closure); |
| set_ready_locked(exec_ctx, fd, &fd->write_closure); |
| gpr_mu_unlock(&fd->mu); |
| } |
| |
| static void fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_closure *closure) { |
| gpr_mu_lock(&fd->mu); |
| notify_on_locked(exec_ctx, fd, &fd->read_closure, closure); |
| gpr_mu_unlock(&fd->mu); |
| } |
| |
| static void fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_closure *closure) { |
| gpr_mu_lock(&fd->mu); |
| notify_on_locked(exec_ctx, fd, &fd->write_closure, closure); |
| gpr_mu_unlock(&fd->mu); |
| } |
| |
| /* Return the read-notifier pollset */ |
| static grpc_pollset *fd_get_read_notifier_pollset(grpc_exec_ctx *exec_ctx, |
| grpc_fd *fd) { |
| grpc_pollset *notifier = NULL; |
| |
| gpr_mu_lock(&fd->mu); |
| notifier = fd->read_notifier_pollset; |
| gpr_mu_unlock(&fd->mu); |
| |
| return notifier; |
| } |
| |
| static uint32_t fd_begin_poll(grpc_fd *fd, grpc_pollset *pollset, |
| grpc_pollset_worker *worker, uint32_t read_mask, |
| uint32_t write_mask, grpc_fd_watcher *watcher) { |
| uint32_t mask = 0; |
| grpc_closure *cur; |
| int requested; |
| /* keep track of pollers that have requested our events, in case they change |
| */ |
| GRPC_FD_REF(fd, "poll"); |
| |
| gpr_mu_lock(&fd->mu); |
| |
| /* if we are shutdown, then don't add to the watcher set */ |
| if (fd->shutdown) { |
| watcher->fd = NULL; |
| watcher->pollset = NULL; |
| watcher->worker = NULL; |
| gpr_mu_unlock(&fd->mu); |
| GRPC_FD_UNREF(fd, "poll"); |
| return 0; |
| } |
| |
| /* if there is nobody polling for read, but we need to, then start doing so */ |
| cur = fd->read_closure; |
| requested = cur != CLOSURE_READY; |
| if (read_mask && fd->read_watcher == NULL && requested) { |
| fd->read_watcher = watcher; |
| mask |= read_mask; |
| } |
| /* if there is nobody polling for write, but we need to, then start doing so |
| */ |
| cur = fd->write_closure; |
| requested = cur != CLOSURE_READY; |
| if (write_mask && fd->write_watcher == NULL && requested) { |
| fd->write_watcher = watcher; |
| mask |= write_mask; |
| } |
| /* if not polling, remember this watcher in case we need someone to later */ |
| if (mask == 0 && worker != NULL) { |
| watcher->next = &fd->inactive_watcher_root; |
| watcher->prev = watcher->next->prev; |
| watcher->next->prev = watcher->prev->next = watcher; |
| } |
| watcher->pollset = pollset; |
| watcher->worker = worker; |
| watcher->fd = fd; |
| gpr_mu_unlock(&fd->mu); |
| |
| return mask; |
| } |
| |
| static void fd_end_poll(grpc_exec_ctx *exec_ctx, grpc_fd_watcher *watcher, |
| int got_read, int got_write, |
| grpc_pollset *read_notifier_pollset) { |
| int was_polling = 0; |
| int kick = 0; |
| grpc_fd *fd = watcher->fd; |
| |
| if (fd == NULL) { |
| return; |
| } |
| |
| gpr_mu_lock(&fd->mu); |
| |
| if (watcher == fd->read_watcher) { |
| /* remove read watcher, kick if we still need a read */ |
| was_polling = 1; |
| if (!got_read) { |
| kick = 1; |
| } |
| fd->read_watcher = NULL; |
| } |
| if (watcher == fd->write_watcher) { |
| /* remove write watcher, kick if we still need a write */ |
| was_polling = 1; |
| if (!got_write) { |
| kick = 1; |
| } |
| fd->write_watcher = NULL; |
| } |
| if (!was_polling && watcher->worker != NULL) { |
| /* remove from inactive list */ |
| watcher->next->prev = watcher->prev; |
| watcher->prev->next = watcher->next; |
| } |
| if (got_read) { |
| if (set_ready_locked(exec_ctx, fd, &fd->read_closure)) { |
| kick = 1; |
| } |
| |
| if (read_notifier_pollset != NULL) { |
| set_read_notifier_pollset_locked(exec_ctx, fd, read_notifier_pollset); |
| } |
| } |
| if (got_write) { |
| if (set_ready_locked(exec_ctx, fd, &fd->write_closure)) { |
| kick = 1; |
| } |
| } |
| if (kick) { |
| maybe_wake_one_watcher_locked(fd); |
| } |
| if (fd_is_orphaned(fd) && !has_watchers(fd) && !fd->closed) { |
| close_fd_locked(exec_ctx, fd); |
| } |
| gpr_mu_unlock(&fd->mu); |
| |
| GRPC_FD_UNREF(fd, "poll"); |
| } |
| |
| /******************************************************************************* |
| * pollset_posix.c |
| */ |
| |
| GPR_TLS_DECL(g_current_thread_poller); |
| GPR_TLS_DECL(g_current_thread_worker); |
| |
| /** The alarm system needs to be able to wakeup 'some poller' sometimes |
| * (specifically when a new alarm needs to be triggered earlier than the next |
| * alarm 'epoch'). |
| * This wakeup_fd gives us something to alert on when such a case occurs. */ |
| grpc_wakeup_fd grpc_global_wakeup_fd; |
| |
| static void remove_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
| worker->prev->next = worker->next; |
| worker->next->prev = worker->prev; |
| } |
| |
| static int pollset_has_workers(grpc_pollset *p) { |
| return p->root_worker.next != &p->root_worker; |
| } |
| |
| static grpc_pollset_worker *pop_front_worker(grpc_pollset *p) { |
| if (pollset_has_workers(p)) { |
| grpc_pollset_worker *w = p->root_worker.next; |
| remove_worker(p, w); |
| return w; |
| } else { |
| return NULL; |
| } |
| } |
| |
| static void push_back_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
| worker->next = &p->root_worker; |
| worker->prev = worker->next->prev; |
| worker->prev->next = worker->next->prev = worker; |
| } |
| |
| static void push_front_worker(grpc_pollset *p, grpc_pollset_worker *worker) { |
| worker->prev = &p->root_worker; |
| worker->next = worker->prev->next; |
| worker->prev->next = worker->next->prev = worker; |
| } |
| |
| static void pollset_kick_ext(grpc_pollset *p, |
| grpc_pollset_worker *specific_worker, |
| uint32_t flags) { |
| GPR_TIMER_BEGIN("pollset_kick_ext", 0); |
| |
| /* pollset->mu already held */ |
| if (specific_worker != NULL) { |
| if (specific_worker == GRPC_POLLSET_KICK_BROADCAST) { |
| GPR_TIMER_BEGIN("pollset_kick_ext.broadcast", 0); |
| GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0); |
| for (specific_worker = p->root_worker.next; |
| specific_worker != &p->root_worker; |
| specific_worker = specific_worker->next) { |
| grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| } |
| p->kicked_without_pollers = 1; |
| GPR_TIMER_END("pollset_kick_ext.broadcast", 0); |
| } else if (gpr_tls_get(&g_current_thread_worker) != |
| (intptr_t)specific_worker) { |
| GPR_TIMER_MARK("different_thread_worker", 0); |
| if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) { |
| specific_worker->reevaluate_polling_on_wakeup = 1; |
| } |
| specific_worker->kicked_specifically = 1; |
| grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| } else if ((flags & GRPC_POLLSET_CAN_KICK_SELF) != 0) { |
| GPR_TIMER_MARK("kick_yoself", 0); |
| if ((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) != 0) { |
| specific_worker->reevaluate_polling_on_wakeup = 1; |
| } |
| specific_worker->kicked_specifically = 1; |
| grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| } |
| } else if (gpr_tls_get(&g_current_thread_poller) != (intptr_t)p) { |
| GPR_ASSERT((flags & GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) == 0); |
| GPR_TIMER_MARK("kick_anonymous", 0); |
| specific_worker = pop_front_worker(p); |
| if (specific_worker != NULL) { |
| if (gpr_tls_get(&g_current_thread_worker) == (intptr_t)specific_worker) { |
| /* Prefer not to kick self. Push the worker to the end of the list and |
| * pop the one from front */ |
| GPR_TIMER_MARK("kick_anonymous_not_self", 0); |
| push_back_worker(p, specific_worker); |
| specific_worker = pop_front_worker(p); |
| /* If there was only one worker on the pollset, we would get the same |
| * worker we pushed (the one set on current thread local) back. If so, |
| * kick it only if GRPC_POLLSET_CAN_KICK_SELF flag is set */ |
| if ((flags & GRPC_POLLSET_CAN_KICK_SELF) == 0 && |
| gpr_tls_get(&g_current_thread_worker) == |
| (intptr_t)specific_worker) { |
| push_back_worker(p, specific_worker); |
| specific_worker = NULL; |
| } |
| } |
| if (specific_worker != NULL) { |
| GPR_TIMER_MARK("finally_kick", 0); |
| push_back_worker(p, specific_worker); |
| grpc_wakeup_fd_wakeup(&specific_worker->wakeup_fd->fd); |
| } |
| } else { |
| GPR_TIMER_MARK("kicked_no_pollers", 0); |
| p->kicked_without_pollers = 1; |
| } |
| } |
| |
| GPR_TIMER_END("pollset_kick_ext", 0); |
| } |
| |
| static void pollset_kick(grpc_pollset *p, |
| grpc_pollset_worker *specific_worker) { |
| pollset_kick_ext(p, specific_worker, 0); |
| } |
| |
| /* global state management */ |
| |
| static void pollset_global_init(void) { |
| gpr_tls_init(&g_current_thread_poller); |
| gpr_tls_init(&g_current_thread_worker); |
| grpc_wakeup_fd_init(&grpc_global_wakeup_fd); |
| } |
| |
| static void pollset_global_shutdown(void) { |
| grpc_wakeup_fd_destroy(&grpc_global_wakeup_fd); |
| gpr_tls_destroy(&g_current_thread_poller); |
| gpr_tls_destroy(&g_current_thread_worker); |
| } |
| |
| static void kick_poller(void) { grpc_wakeup_fd_wakeup(&grpc_global_wakeup_fd); } |
| |
| /* main interface */ |
| |
| static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null); |
| |
| static void pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
| gpr_mu_init(&pollset->mu); |
| *mu = &pollset->mu; |
| pollset->root_worker.next = pollset->root_worker.prev = &pollset->root_worker; |
| pollset->in_flight_cbs = 0; |
| pollset->shutting_down = 0; |
| pollset->called_shutdown = 0; |
| pollset->kicked_without_pollers = 0; |
| pollset->idle_jobs.head = pollset->idle_jobs.tail = NULL; |
| pollset->local_wakeup_cache = NULL; |
| pollset->kicked_without_pollers = 0; |
| become_basic_pollset(pollset, NULL); |
| } |
| |
| static void pollset_destroy(grpc_pollset *pollset) { |
| GPR_ASSERT(pollset->in_flight_cbs == 0); |
| GPR_ASSERT(!pollset_has_workers(pollset)); |
| GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail); |
| pollset->vtable->destroy(pollset); |
| while (pollset->local_wakeup_cache) { |
| grpc_cached_wakeup_fd *next = pollset->local_wakeup_cache->next; |
| grpc_wakeup_fd_destroy(&pollset->local_wakeup_cache->fd); |
| gpr_free(pollset->local_wakeup_cache); |
| pollset->local_wakeup_cache = next; |
| } |
| gpr_mu_destroy(&pollset->mu); |
| } |
| |
| static void pollset_reset(grpc_pollset *pollset) { |
| GPR_ASSERT(pollset->shutting_down); |
| GPR_ASSERT(pollset->in_flight_cbs == 0); |
| GPR_ASSERT(!pollset_has_workers(pollset)); |
| GPR_ASSERT(pollset->idle_jobs.head == pollset->idle_jobs.tail); |
| pollset->vtable->destroy(pollset); |
| pollset->shutting_down = 0; |
| pollset->called_shutdown = 0; |
| pollset->kicked_without_pollers = 0; |
| become_basic_pollset(pollset, NULL); |
| } |
| |
| static void pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_fd *fd) { |
| gpr_mu_lock(&pollset->mu); |
| pollset->vtable->add_fd(exec_ctx, pollset, fd, 1); |
| /* the following (enabled only in debug) will reacquire and then release |
| our lock - meaning that if the unlocking flag passed to add_fd above is |
| not respected, the code will deadlock (in a way that we have a chance of |
| debugging) */ |
| #ifndef NDEBUG |
| gpr_mu_lock(&pollset->mu); |
| gpr_mu_unlock(&pollset->mu); |
| #endif |
| } |
| |
| static void finish_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
| GPR_ASSERT(grpc_closure_list_empty(pollset->idle_jobs)); |
| pollset->vtable->finish_shutdown(pollset); |
| grpc_exec_ctx_enqueue(exec_ctx, pollset->shutdown_done, true, NULL); |
| } |
| |
| static void pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_pollset_worker **worker_hdl, gpr_timespec now, |
| gpr_timespec deadline) { |
| grpc_pollset_worker worker; |
| *worker_hdl = &worker; |
| |
| /* pollset->mu already held */ |
| int added_worker = 0; |
| int locked = 1; |
| int queued_work = 0; |
| int keep_polling = 0; |
| GPR_TIMER_BEGIN("pollset_work", 0); |
| /* this must happen before we (potentially) drop pollset->mu */ |
| worker.next = worker.prev = NULL; |
| worker.reevaluate_polling_on_wakeup = 0; |
| if (pollset->local_wakeup_cache != NULL) { |
| worker.wakeup_fd = pollset->local_wakeup_cache; |
| pollset->local_wakeup_cache = worker.wakeup_fd->next; |
| } else { |
| worker.wakeup_fd = gpr_malloc(sizeof(*worker.wakeup_fd)); |
| grpc_wakeup_fd_init(&worker.wakeup_fd->fd); |
| } |
| worker.kicked_specifically = 0; |
| /* If there's work waiting for the pollset to be idle, and the |
| pollset is idle, then do that work */ |
| if (!pollset_has_workers(pollset) && |
| !grpc_closure_list_empty(pollset->idle_jobs)) { |
| GPR_TIMER_MARK("pollset_work.idle_jobs", 0); |
| grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
| goto done; |
| } |
| /* If we're shutting down then we don't execute any extended work */ |
| if (pollset->shutting_down) { |
| GPR_TIMER_MARK("pollset_work.shutting_down", 0); |
| goto done; |
| } |
| /* Give do_promote priority so we don't starve it out */ |
| if (pollset->in_flight_cbs) { |
| GPR_TIMER_MARK("pollset_work.in_flight_cbs", 0); |
| gpr_mu_unlock(&pollset->mu); |
| locked = 0; |
| goto done; |
| } |
| /* Start polling, and keep doing so while we're being asked to |
| re-evaluate our pollers (this allows poll() based pollers to |
| ensure they don't miss wakeups) */ |
| keep_polling = 1; |
| while (keep_polling) { |
| keep_polling = 0; |
| if (!pollset->kicked_without_pollers) { |
| if (!added_worker) { |
| push_front_worker(pollset, &worker); |
| added_worker = 1; |
| gpr_tls_set(&g_current_thread_worker, (intptr_t)&worker); |
| } |
| gpr_tls_set(&g_current_thread_poller, (intptr_t)pollset); |
| GPR_TIMER_BEGIN("maybe_work_and_unlock", 0); |
| pollset->vtable->maybe_work_and_unlock(exec_ctx, pollset, &worker, |
| deadline, now); |
| GPR_TIMER_END("maybe_work_and_unlock", 0); |
| locked = 0; |
| gpr_tls_set(&g_current_thread_poller, 0); |
| } else { |
| GPR_TIMER_MARK("pollset_work.kicked_without_pollers", 0); |
| pollset->kicked_without_pollers = 0; |
| } |
| /* Finished execution - start cleaning up. |
| Note that we may arrive here from outside the enclosing while() loop. |
| In that case we won't loop though as we haven't added worker to the |
| worker list, which means nobody could ask us to re-evaluate polling). */ |
| done: |
| if (!locked) { |
| queued_work |= grpc_exec_ctx_flush(exec_ctx); |
| gpr_mu_lock(&pollset->mu); |
| locked = 1; |
| } |
| /* If we're forced to re-evaluate polling (via pollset_kick with |
| GRPC_POLLSET_REEVALUATE_POLLING_ON_WAKEUP) then we land here and force |
| a loop */ |
| if (worker.reevaluate_polling_on_wakeup) { |
| worker.reevaluate_polling_on_wakeup = 0; |
| pollset->kicked_without_pollers = 0; |
| if (queued_work || worker.kicked_specifically) { |
| /* If there's queued work on the list, then set the deadline to be |
| immediate so we get back out of the polling loop quickly */ |
| deadline = gpr_inf_past(GPR_CLOCK_MONOTONIC); |
| } |
| keep_polling = 1; |
| } |
| } |
| if (added_worker) { |
| remove_worker(pollset, &worker); |
| gpr_tls_set(&g_current_thread_worker, 0); |
| } |
| /* release wakeup fd to the local pool */ |
| worker.wakeup_fd->next = pollset->local_wakeup_cache; |
| pollset->local_wakeup_cache = worker.wakeup_fd; |
| /* check shutdown conditions */ |
| if (pollset->shutting_down) { |
| if (pollset_has_workers(pollset)) { |
| pollset_kick(pollset, NULL); |
| } else if (!pollset->called_shutdown && pollset->in_flight_cbs == 0) { |
| pollset->called_shutdown = 1; |
| gpr_mu_unlock(&pollset->mu); |
| finish_shutdown(exec_ctx, pollset); |
| grpc_exec_ctx_flush(exec_ctx); |
| /* Continuing to access pollset here is safe -- it is the caller's |
| * responsibility to not destroy when it has outstanding calls to |
| * pollset_work. |
| * TODO(dklempner): Can we refactor the shutdown logic to avoid this? */ |
| gpr_mu_lock(&pollset->mu); |
| } else if (!grpc_closure_list_empty(pollset->idle_jobs)) { |
| grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
| gpr_mu_unlock(&pollset->mu); |
| grpc_exec_ctx_flush(exec_ctx); |
| gpr_mu_lock(&pollset->mu); |
| } |
| } |
| *worker_hdl = NULL; |
| GPR_TIMER_END("pollset_work", 0); |
| } |
| |
| static void pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_closure *closure) { |
| GPR_ASSERT(!pollset->shutting_down); |
| pollset->shutting_down = 1; |
| pollset->shutdown_done = closure; |
| pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST); |
| if (!pollset_has_workers(pollset)) { |
| grpc_exec_ctx_enqueue_list(exec_ctx, &pollset->idle_jobs, NULL); |
| } |
| if (!pollset->called_shutdown && pollset->in_flight_cbs == 0 && |
| !pollset_has_workers(pollset)) { |
| pollset->called_shutdown = 1; |
| finish_shutdown(exec_ctx, pollset); |
| } |
| } |
| |
| static int poll_deadline_to_millis_timeout(gpr_timespec deadline, |
| gpr_timespec now) { |
| gpr_timespec timeout; |
| static const int64_t max_spin_polling_us = 10; |
| if (gpr_time_cmp(deadline, gpr_inf_future(deadline.clock_type)) == 0) { |
| return -1; |
| } |
| if (gpr_time_cmp(deadline, gpr_time_add(now, gpr_time_from_micros( |
| max_spin_polling_us, |
| GPR_TIMESPAN))) <= 0) { |
| return 0; |
| } |
| timeout = gpr_time_sub(deadline, now); |
| return gpr_time_to_millis(gpr_time_add( |
| timeout, gpr_time_from_nanos(GPR_NS_PER_MS - 1, GPR_TIMESPAN))); |
| } |
| |
| /* |
| * basic_pollset - a vtable that provides polling for zero or one file |
| * descriptor via poll() |
| */ |
| |
| typedef struct grpc_unary_promote_args { |
| const grpc_pollset_vtable *original_vtable; |
| grpc_pollset *pollset; |
| grpc_fd *fd; |
| grpc_closure promotion_closure; |
| } grpc_unary_promote_args; |
| |
| static void basic_do_promote(grpc_exec_ctx *exec_ctx, void *args, |
| bool success) { |
| grpc_unary_promote_args *up_args = args; |
| const grpc_pollset_vtable *original_vtable = up_args->original_vtable; |
| grpc_pollset *pollset = up_args->pollset; |
| grpc_fd *fd = up_args->fd; |
| |
| /* |
| * This is quite tricky. There are a number of cases to keep in mind here: |
| * 1. fd may have been orphaned |
| * 2. The pollset may no longer be a unary poller (and we can't let case #1 |
| * leak to other pollset types!) |
| * 3. pollset's fd (which may have changed) may have been orphaned |
| * 4. The pollset may be shutting down. |
| */ |
| |
| gpr_mu_lock(&pollset->mu); |
| /* First we need to ensure that nobody is polling concurrently */ |
| GPR_ASSERT(!pollset_has_workers(pollset)); |
| |
| gpr_free(up_args); |
| /* At this point the pollset may no longer be a unary poller. In that case |
| * we should just call the right add function and be done. */ |
| /* TODO(klempner): If we're not careful this could cause infinite recursion. |
| * That's not a problem for now because empty_pollset has a trivial poller |
| * and we don't have any mechanism to unbecome multipoller. */ |
| pollset->in_flight_cbs--; |
| if (pollset->shutting_down) { |
| /* We don't care about this pollset anymore. */ |
| if (pollset->in_flight_cbs == 0 && !pollset->called_shutdown) { |
| pollset->called_shutdown = 1; |
| finish_shutdown(exec_ctx, pollset); |
| } |
| } else if (fd_is_orphaned(fd)) { |
| /* Don't try to add it to anything, we'll drop our ref on it below */ |
| } else if (pollset->vtable != original_vtable) { |
| pollset->vtable->add_fd(exec_ctx, pollset, fd, 0); |
| } else if (fd != pollset->data.ptr) { |
| grpc_fd *fds[2]; |
| fds[0] = pollset->data.ptr; |
| fds[1] = fd; |
| |
| if (fds[0] && !fd_is_orphaned(fds[0])) { |
| platform_become_multipoller(exec_ctx, pollset, fds, GPR_ARRAY_SIZE(fds)); |
| GRPC_FD_UNREF(fds[0], "basicpoll"); |
| } else { |
| /* old fd is orphaned and we haven't cleaned it up until now, so remain a |
| * unary poller */ |
| /* Note that it is possible that fds[1] is also orphaned at this point. |
| * That's okay, we'll correct it at the next add or poll. */ |
| if (fds[0]) GRPC_FD_UNREF(fds[0], "basicpoll"); |
| pollset->data.ptr = fd; |
| GRPC_FD_REF(fd, "basicpoll"); |
| } |
| } |
| |
| gpr_mu_unlock(&pollset->mu); |
| |
| /* Matching ref in basic_pollset_add_fd */ |
| GRPC_FD_UNREF(fd, "basicpoll_add"); |
| } |
| |
| static void basic_pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_fd *fd, int and_unlock_pollset) { |
| grpc_unary_promote_args *up_args; |
| GPR_ASSERT(fd); |
| if (fd == pollset->data.ptr) goto exit; |
| |
| if (!pollset_has_workers(pollset)) { |
| /* Fast path -- no in flight cbs */ |
| /* TODO(klempner): Comment this out and fix any test failures or establish |
| * they are due to timing issues */ |
| grpc_fd *fds[2]; |
| fds[0] = pollset->data.ptr; |
| fds[1] = fd; |
| |
| if (fds[0] == NULL) { |
| pollset->data.ptr = fd; |
| GRPC_FD_REF(fd, "basicpoll"); |
| } else if (!fd_is_orphaned(fds[0])) { |
| platform_become_multipoller(exec_ctx, pollset, fds, GPR_ARRAY_SIZE(fds)); |
| GRPC_FD_UNREF(fds[0], "basicpoll"); |
| } else { |
| /* old fd is orphaned and we haven't cleaned it up until now, so remain a |
| * unary poller */ |
| GRPC_FD_UNREF(fds[0], "basicpoll"); |
| pollset->data.ptr = fd; |
| GRPC_FD_REF(fd, "basicpoll"); |
| } |
| goto exit; |
| } |
| |
| /* Now we need to promote. This needs to happen when we're not polling. Since |
| * this may be called from poll, the wait needs to happen asynchronously. */ |
| GRPC_FD_REF(fd, "basicpoll_add"); |
| pollset->in_flight_cbs++; |
| up_args = gpr_malloc(sizeof(*up_args)); |
| up_args->fd = fd; |
| up_args->original_vtable = pollset->vtable; |
| up_args->pollset = pollset; |
| up_args->promotion_closure.cb = basic_do_promote; |
| up_args->promotion_closure.cb_arg = up_args; |
| |
| grpc_closure_list_add(&pollset->idle_jobs, &up_args->promotion_closure, 1); |
| pollset_kick(pollset, GRPC_POLLSET_KICK_BROADCAST); |
| |
| exit: |
| if (and_unlock_pollset) { |
| gpr_mu_unlock(&pollset->mu); |
| } |
| } |
| |
| static void basic_pollset_maybe_work_and_unlock(grpc_exec_ctx *exec_ctx, |
| grpc_pollset *pollset, |
| grpc_pollset_worker *worker, |
| gpr_timespec deadline, |
| gpr_timespec now) { |
| #define POLLOUT_CHECK (POLLOUT | POLLHUP | POLLERR) |
| #define POLLIN_CHECK (POLLIN | POLLHUP | POLLERR) |
| |
| struct pollfd pfd[3]; |
| grpc_fd *fd; |
| grpc_fd_watcher fd_watcher; |
| int timeout; |
| int r; |
| nfds_t nfds; |
| |
| fd = pollset->data.ptr; |
| if (fd && fd_is_orphaned(fd)) { |
| GRPC_FD_UNREF(fd, "basicpoll"); |
| fd = pollset->data.ptr = NULL; |
| } |
| timeout = poll_deadline_to_millis_timeout(deadline, now); |
| pfd[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd); |
| pfd[0].events = POLLIN; |
| pfd[0].revents = 0; |
| pfd[1].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd); |
| pfd[1].events = POLLIN; |
| pfd[1].revents = 0; |
| nfds = 2; |
| if (fd) { |
| pfd[2].fd = fd->fd; |
| pfd[2].revents = 0; |
| GRPC_FD_REF(fd, "basicpoll_begin"); |
| gpr_mu_unlock(&pollset->mu); |
| pfd[2].events = |
| (short)fd_begin_poll(fd, pollset, worker, POLLIN, POLLOUT, &fd_watcher); |
| if (pfd[2].events != 0) { |
| nfds++; |
| } |
| } else { |
| gpr_mu_unlock(&pollset->mu); |
| } |
| |
| /* TODO(vpai): Consider first doing a 0 timeout poll here to avoid |
| even going into the blocking annotation if possible */ |
| /* poll fd count (argument 2) is shortened by one if we have no events |
| to poll on - such that it only includes the kicker */ |
| GPR_TIMER_BEGIN("poll", 0); |
| GRPC_SCHEDULING_START_BLOCKING_REGION; |
| r = grpc_poll_function(pfd, nfds, timeout); |
| GRPC_SCHEDULING_END_BLOCKING_REGION; |
| GPR_TIMER_END("poll", 0); |
| |
| if (r < 0) { |
| if (errno != EINTR) { |
| gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
| } |
| if (fd) { |
| fd_end_poll(exec_ctx, &fd_watcher, 0, 0, NULL); |
| } |
| } else if (r == 0) { |
| if (fd) { |
| fd_end_poll(exec_ctx, &fd_watcher, 0, 0, NULL); |
| } |
| } else { |
| if (pfd[0].revents & POLLIN_CHECK) { |
| grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd); |
| } |
| if (pfd[1].revents & POLLIN_CHECK) { |
| grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd); |
| } |
| if (nfds > 2) { |
| fd_end_poll(exec_ctx, &fd_watcher, pfd[2].revents & POLLIN_CHECK, |
| pfd[2].revents & POLLOUT_CHECK, pollset); |
| } else if (fd) { |
| fd_end_poll(exec_ctx, &fd_watcher, 0, 0, NULL); |
| } |
| } |
| |
| if (fd) { |
| GRPC_FD_UNREF(fd, "basicpoll_begin"); |
| } |
| } |
| |
| static void basic_pollset_destroy(grpc_pollset *pollset) { |
| if (pollset->data.ptr != NULL) { |
| GRPC_FD_UNREF(pollset->data.ptr, "basicpoll"); |
| pollset->data.ptr = NULL; |
| } |
| } |
| |
| static const grpc_pollset_vtable basic_pollset = { |
| basic_pollset_add_fd, basic_pollset_maybe_work_and_unlock, |
| basic_pollset_destroy, basic_pollset_destroy}; |
| |
| static void become_basic_pollset(grpc_pollset *pollset, grpc_fd *fd_or_null) { |
| pollset->vtable = &basic_pollset; |
| pollset->data.ptr = fd_or_null; |
| if (fd_or_null != NULL) { |
| GRPC_FD_REF(fd_or_null, "basicpoll"); |
| } |
| } |
| |
| /******************************************************************************* |
| * pollset_multipoller_with_poll_posix.c |
| */ |
| |
| #ifndef GPR_LINUX_MULTIPOLL_WITH_EPOLL |
| |
| typedef struct { |
| /* all polled fds */ |
| size_t fd_count; |
| size_t fd_capacity; |
| grpc_fd **fds; |
| /* fds that have been removed from the pollset explicitly */ |
| size_t del_count; |
| size_t del_capacity; |
| grpc_fd **dels; |
| } poll_hdr; |
| |
| static void multipoll_with_poll_pollset_add_fd(grpc_exec_ctx *exec_ctx, |
| grpc_pollset *pollset, |
| grpc_fd *fd, |
| int and_unlock_pollset) { |
| size_t i; |
| poll_hdr *h = pollset->data.ptr; |
| /* TODO(ctiller): this is O(num_fds^2); maybe switch to a hash set here */ |
| for (i = 0; i < h->fd_count; i++) { |
| if (h->fds[i] == fd) goto exit; |
| } |
| if (h->fd_count == h->fd_capacity) { |
| h->fd_capacity = GPR_MAX(h->fd_capacity + 8, h->fd_count * 3 / 2); |
| h->fds = gpr_realloc(h->fds, sizeof(grpc_fd *) * h->fd_capacity); |
| } |
| h->fds[h->fd_count++] = fd; |
| GRPC_FD_REF(fd, "multipoller"); |
| exit: |
| if (and_unlock_pollset) { |
| gpr_mu_unlock(&pollset->mu); |
| } |
| } |
| |
| static void multipoll_with_poll_pollset_maybe_work_and_unlock( |
| grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_pollset_worker *worker, |
| gpr_timespec deadline, gpr_timespec now) { |
| #define POLLOUT_CHECK (POLLOUT | POLLHUP | POLLERR) |
| #define POLLIN_CHECK (POLLIN | POLLHUP | POLLERR) |
| |
| int timeout; |
| int r; |
| size_t i, j, fd_count; |
| nfds_t pfd_count; |
| poll_hdr *h; |
| /* TODO(ctiller): inline some elements to avoid an allocation */ |
| grpc_fd_watcher *watchers; |
| struct pollfd *pfds; |
| |
| h = pollset->data.ptr; |
| timeout = poll_deadline_to_millis_timeout(deadline, now); |
| /* TODO(ctiller): perform just one malloc here if we exceed the inline case */ |
| pfds = gpr_malloc(sizeof(*pfds) * (h->fd_count + 2)); |
| watchers = gpr_malloc(sizeof(*watchers) * (h->fd_count + 2)); |
| fd_count = 0; |
| pfd_count = 2; |
| pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd); |
| pfds[0].events = POLLIN; |
| pfds[0].revents = 0; |
| pfds[1].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd); |
| pfds[1].events = POLLIN; |
| pfds[1].revents = 0; |
| for (i = 0; i < h->fd_count; i++) { |
| int remove = fd_is_orphaned(h->fds[i]); |
| for (j = 0; !remove && j < h->del_count; j++) { |
| if (h->fds[i] == h->dels[j]) remove = 1; |
| } |
| if (remove) { |
| GRPC_FD_UNREF(h->fds[i], "multipoller"); |
| } else { |
| h->fds[fd_count++] = h->fds[i]; |
| watchers[pfd_count].fd = h->fds[i]; |
| GRPC_FD_REF(watchers[pfd_count].fd, "multipoller_start"); |
| pfds[pfd_count].fd = h->fds[i]->fd; |
| pfds[pfd_count].revents = 0; |
| pfd_count++; |
| } |
| } |
| for (j = 0; j < h->del_count; j++) { |
| GRPC_FD_UNREF(h->dels[j], "multipoller_del"); |
| } |
| h->del_count = 0; |
| h->fd_count = fd_count; |
| gpr_mu_unlock(&pollset->mu); |
| |
| for (i = 2; i < pfd_count; i++) { |
| grpc_fd *fd = watchers[i].fd; |
| pfds[i].events = (short)fd_begin_poll(fd, pollset, worker, POLLIN, POLLOUT, |
| &watchers[i]); |
| GRPC_FD_UNREF(fd, "multipoller_start"); |
| } |
| |
| /* TODO(vpai): Consider first doing a 0 timeout poll here to avoid |
| even going into the blocking annotation if possible */ |
| GRPC_SCHEDULING_START_BLOCKING_REGION; |
| r = grpc_poll_function(pfds, pfd_count, timeout); |
| GRPC_SCHEDULING_END_BLOCKING_REGION; |
| |
| if (r < 0) { |
| if (errno != EINTR) { |
| gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
| } |
| for (i = 2; i < pfd_count; i++) { |
| fd_end_poll(exec_ctx, &watchers[i], 0, 0, NULL); |
| } |
| } else if (r == 0) { |
| for (i = 2; i < pfd_count; i++) { |
| fd_end_poll(exec_ctx, &watchers[i], 0, 0, NULL); |
| } |
| } else { |
| if (pfds[0].revents & POLLIN_CHECK) { |
| grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd); |
| } |
| if (pfds[1].revents & POLLIN_CHECK) { |
| grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd); |
| } |
| for (i = 2; i < pfd_count; i++) { |
| if (watchers[i].fd == NULL) { |
| fd_end_poll(exec_ctx, &watchers[i], 0, 0, NULL); |
| continue; |
| } |
| fd_end_poll(exec_ctx, &watchers[i], pfds[i].revents & POLLIN_CHECK, |
| pfds[i].revents & POLLOUT_CHECK, pollset); |
| } |
| } |
| |
| gpr_free(pfds); |
| gpr_free(watchers); |
| } |
| |
| static void multipoll_with_poll_pollset_finish_shutdown(grpc_pollset *pollset) { |
| size_t i; |
| poll_hdr *h = pollset->data.ptr; |
| for (i = 0; i < h->fd_count; i++) { |
| GRPC_FD_UNREF(h->fds[i], "multipoller"); |
| } |
| for (i = 0; i < h->del_count; i++) { |
| GRPC_FD_UNREF(h->dels[i], "multipoller_del"); |
| } |
| h->fd_count = 0; |
| h->del_count = 0; |
| } |
| |
| static void multipoll_with_poll_pollset_destroy(grpc_pollset *pollset) { |
| poll_hdr *h = pollset->data.ptr; |
| multipoll_with_poll_pollset_finish_shutdown(pollset); |
| gpr_free(h->fds); |
| gpr_free(h->dels); |
| gpr_free(h); |
| } |
| |
| static const grpc_pollset_vtable multipoll_with_poll_pollset = { |
| multipoll_with_poll_pollset_add_fd, |
| multipoll_with_poll_pollset_maybe_work_and_unlock, |
| multipoll_with_poll_pollset_finish_shutdown, |
| multipoll_with_poll_pollset_destroy}; |
| |
| static void poll_become_multipoller(grpc_exec_ctx *exec_ctx, |
| grpc_pollset *pollset, grpc_fd **fds, |
| size_t nfds) { |
| size_t i; |
| poll_hdr *h = gpr_malloc(sizeof(poll_hdr)); |
| pollset->vtable = &multipoll_with_poll_pollset; |
| pollset->data.ptr = h; |
| h->fd_count = nfds; |
| h->fd_capacity = nfds; |
| h->fds = gpr_malloc(nfds * sizeof(grpc_fd *)); |
| h->del_count = 0; |
| h->del_capacity = 0; |
| h->dels = NULL; |
| for (i = 0; i < nfds; i++) { |
| h->fds[i] = fds[i]; |
| GRPC_FD_REF(fds[i], "multipoller"); |
| } |
| } |
| |
| #endif /* !GPR_LINUX_MULTIPOLL_WITH_EPOLL */ |
| |
| /******************************************************************************* |
| * pollset_multipoller_with_epoll_posix.c |
| */ |
| |
| #ifdef GPR_LINUX_MULTIPOLL_WITH_EPOLL |
| |
| #include <errno.h> |
| #include <poll.h> |
| #include <string.h> |
| #include <sys/epoll.h> |
| #include <unistd.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/useful.h> |
| |
| #include "src/core/lib/iomgr/ev_posix.h" |
| #include "src/core/lib/profiling/timers.h" |
| #include "src/core/lib/support/block_annotate.h" |
| |
| static void set_ready(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_closure **st, |
| grpc_pollset *read_notifier_pollset) { |
| /* only one set_ready can be active at once (but there may be a racing |
| notify_on) */ |
| gpr_mu_lock(&fd->mu); |
| set_ready_locked(exec_ctx, fd, st); |
| |
| /* A non-NULL read_notifier_pollset means that the fd is readable. */ |
| if (read_notifier_pollset != NULL) { |
| /* Note: Since the fd might be a part of multiple pollsets, this might be |
| * called multiple times (for each time the fd becomes readable) and it is |
| * okay to set the fd's read-notifier pollset to anyone of these pollsets */ |
| set_read_notifier_pollset_locked(exec_ctx, fd, read_notifier_pollset); |
| } |
| |
| gpr_mu_unlock(&fd->mu); |
| } |
| |
| static void fd_become_readable(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_pollset *notifier_pollset) { |
| set_ready(exec_ctx, fd, &fd->read_closure, notifier_pollset); |
| } |
| |
| static void fd_become_writable(grpc_exec_ctx *exec_ctx, grpc_fd *fd) { |
| set_ready(exec_ctx, fd, &fd->write_closure, NULL); |
| } |
| |
| struct epoll_fd_list { |
| int *epoll_fds; |
| size_t count; |
| size_t capacity; |
| }; |
| |
| static struct epoll_fd_list epoll_fd_global_list; |
| static gpr_once init_epoll_fd_list_mu = GPR_ONCE_INIT; |
| static gpr_mu epoll_fd_list_mu; |
| |
| static void init_mu(void) { gpr_mu_init(&epoll_fd_list_mu); } |
| |
| static void add_epoll_fd_to_global_list(int epoll_fd) { |
| gpr_once_init(&init_epoll_fd_list_mu, init_mu); |
| |
| gpr_mu_lock(&epoll_fd_list_mu); |
| if (epoll_fd_global_list.count == epoll_fd_global_list.capacity) { |
| epoll_fd_global_list.capacity = |
| GPR_MAX((size_t)8, epoll_fd_global_list.capacity * 2); |
| epoll_fd_global_list.epoll_fds = |
| gpr_realloc(epoll_fd_global_list.epoll_fds, |
| epoll_fd_global_list.capacity * sizeof(int)); |
| } |
| epoll_fd_global_list.epoll_fds[epoll_fd_global_list.count++] = epoll_fd; |
| gpr_mu_unlock(&epoll_fd_list_mu); |
| } |
| |
| static void remove_epoll_fd_from_global_list(int epoll_fd) { |
| gpr_mu_lock(&epoll_fd_list_mu); |
| GPR_ASSERT(epoll_fd_global_list.count > 0); |
| for (size_t i = 0; i < epoll_fd_global_list.count; i++) { |
| if (epoll_fd == epoll_fd_global_list.epoll_fds[i]) { |
| epoll_fd_global_list.epoll_fds[i] = |
| epoll_fd_global_list.epoll_fds[--(epoll_fd_global_list.count)]; |
| break; |
| } |
| } |
| gpr_mu_unlock(&epoll_fd_list_mu); |
| } |
| |
| static void remove_fd_from_all_epoll_sets(int fd) { |
| int err; |
| gpr_once_init(&init_epoll_fd_list_mu, init_mu); |
| gpr_mu_lock(&epoll_fd_list_mu); |
| if (epoll_fd_global_list.count == 0) { |
| gpr_mu_unlock(&epoll_fd_list_mu); |
| return; |
| } |
| for (size_t i = 0; i < epoll_fd_global_list.count; i++) { |
| err = epoll_ctl(epoll_fd_global_list.epoll_fds[i], EPOLL_CTL_DEL, fd, NULL); |
| if (err < 0 && errno != ENOENT) { |
| gpr_log(GPR_ERROR, "epoll_ctl del for %d failed: %s", fd, |
| strerror(errno)); |
| } |
| } |
| gpr_mu_unlock(&epoll_fd_list_mu); |
| } |
| |
| typedef struct { |
| grpc_pollset *pollset; |
| grpc_fd *fd; |
| grpc_closure closure; |
| } delayed_add; |
| |
| typedef struct { int epoll_fd; } epoll_hdr; |
| |
| static void finally_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_fd *fd) { |
| epoll_hdr *h = pollset->data.ptr; |
| struct epoll_event ev; |
| int err; |
| grpc_fd_watcher watcher; |
| |
| /* We pretend to be polling whilst adding an fd to keep the fd from being |
| closed during the add. This may result in a spurious wakeup being assigned |
| to this pollset whilst adding, but that should be benign. */ |
| GPR_ASSERT(fd_begin_poll(fd, pollset, NULL, 0, 0, &watcher) == 0); |
| if (watcher.fd != NULL) { |
| ev.events = (uint32_t)(EPOLLIN | EPOLLOUT | EPOLLET); |
| ev.data.ptr = fd; |
| err = epoll_ctl(h->epoll_fd, EPOLL_CTL_ADD, fd->fd, &ev); |
| if (err < 0) { |
| /* FDs may be added to a pollset multiple times, so EEXIST is normal. */ |
| if (errno != EEXIST) { |
| gpr_log(GPR_ERROR, "epoll_ctl add for %d failed: %s", fd->fd, |
| strerror(errno)); |
| } |
| } |
| } |
| fd_end_poll(exec_ctx, &watcher, 0, 0, NULL); |
| } |
| |
| static void perform_delayed_add(grpc_exec_ctx *exec_ctx, void *arg, |
| bool iomgr_status) { |
| delayed_add *da = arg; |
| |
| if (!fd_is_orphaned(da->fd)) { |
| finally_add_fd(exec_ctx, da->pollset, da->fd); |
| } |
| |
| gpr_mu_lock(&da->pollset->mu); |
| da->pollset->in_flight_cbs--; |
| if (da->pollset->shutting_down) { |
| /* We don't care about this pollset anymore. */ |
| if (da->pollset->in_flight_cbs == 0 && !da->pollset->called_shutdown) { |
| da->pollset->called_shutdown = 1; |
| grpc_exec_ctx_enqueue(exec_ctx, da->pollset->shutdown_done, true, NULL); |
| } |
| } |
| gpr_mu_unlock(&da->pollset->mu); |
| |
| GRPC_FD_UNREF(da->fd, "delayed_add"); |
| |
| gpr_free(da); |
| } |
| |
| static void multipoll_with_epoll_pollset_add_fd(grpc_exec_ctx *exec_ctx, |
| grpc_pollset *pollset, |
| grpc_fd *fd, |
| int and_unlock_pollset) { |
| if (and_unlock_pollset) { |
| gpr_mu_unlock(&pollset->mu); |
| finally_add_fd(exec_ctx, pollset, fd); |
| } else { |
| delayed_add *da = gpr_malloc(sizeof(*da)); |
| da->pollset = pollset; |
| da->fd = fd; |
| GRPC_FD_REF(fd, "delayed_add"); |
| grpc_closure_init(&da->closure, perform_delayed_add, da); |
| pollset->in_flight_cbs++; |
| grpc_exec_ctx_enqueue(exec_ctx, &da->closure, true, NULL); |
| } |
| } |
| |
| /* TODO(klempner): We probably want to turn this down a bit */ |
| #define GRPC_EPOLL_MAX_EVENTS 1000 |
| |
| static void multipoll_with_epoll_pollset_maybe_work_and_unlock( |
| grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, grpc_pollset_worker *worker, |
| gpr_timespec deadline, gpr_timespec now) { |
| struct epoll_event ep_ev[GRPC_EPOLL_MAX_EVENTS]; |
| int ep_rv; |
| int poll_rv; |
| epoll_hdr *h = pollset->data.ptr; |
| int timeout_ms; |
| struct pollfd pfds[2]; |
| |
| /* If you want to ignore epoll's ability to sanely handle parallel pollers, |
| * for a more apples-to-apples performance comparison with poll, add a |
| * if (pollset->counter != 0) { return 0; } |
| * here. |
| */ |
| |
| gpr_mu_unlock(&pollset->mu); |
| |
| timeout_ms = poll_deadline_to_millis_timeout(deadline, now); |
| |
| pfds[0].fd = GRPC_WAKEUP_FD_GET_READ_FD(&worker->wakeup_fd->fd); |
| pfds[0].events = POLLIN; |
| pfds[0].revents = 0; |
| pfds[1].fd = h->epoll_fd; |
| pfds[1].events = POLLIN; |
| pfds[1].revents = 0; |
| |
| /* TODO(vpai): Consider first doing a 0 timeout poll here to avoid |
| even going into the blocking annotation if possible */ |
| GPR_TIMER_BEGIN("poll", 0); |
| GRPC_SCHEDULING_START_BLOCKING_REGION; |
| poll_rv = grpc_poll_function(pfds, 2, timeout_ms); |
| GRPC_SCHEDULING_END_BLOCKING_REGION; |
| GPR_TIMER_END("poll", 0); |
| |
| if (poll_rv < 0) { |
| if (errno != EINTR) { |
| gpr_log(GPR_ERROR, "poll() failed: %s", strerror(errno)); |
| } |
| } else if (poll_rv == 0) { |
| /* do nothing */ |
| } else { |
| if (pfds[0].revents) { |
| grpc_wakeup_fd_consume_wakeup(&worker->wakeup_fd->fd); |
| } |
| if (pfds[1].revents) { |
| do { |
| /* The following epoll_wait never blocks; it has a timeout of 0 */ |
| ep_rv = epoll_wait(h->epoll_fd, ep_ev, GRPC_EPOLL_MAX_EVENTS, 0); |
| if (ep_rv < 0) { |
| if (errno != EINTR) { |
| gpr_log(GPR_ERROR, "epoll_wait() failed: %s", strerror(errno)); |
| } |
| } else { |
| int i; |
| for (i = 0; i < ep_rv; ++i) { |
| grpc_fd *fd = ep_ev[i].data.ptr; |
| /* TODO(klempner): We might want to consider making err and pri |
| * separate events */ |
| int cancel = ep_ev[i].events & (EPOLLERR | EPOLLHUP); |
| int read_ev = ep_ev[i].events & (EPOLLIN | EPOLLPRI); |
| int write_ev = ep_ev[i].events & EPOLLOUT; |
| if (fd == NULL) { |
| grpc_wakeup_fd_consume_wakeup(&grpc_global_wakeup_fd); |
| } else { |
| if (read_ev || cancel) { |
| fd_become_readable(exec_ctx, fd, pollset); |
| } |
| if (write_ev || cancel) { |
| fd_become_writable(exec_ctx, fd); |
| } |
| } |
| } |
| } |
| } while (ep_rv == GRPC_EPOLL_MAX_EVENTS); |
| } |
| } |
| } |
| |
| static void multipoll_with_epoll_pollset_finish_shutdown( |
| grpc_pollset *pollset) {} |
| |
| static void multipoll_with_epoll_pollset_destroy(grpc_pollset *pollset) { |
| epoll_hdr *h = pollset->data.ptr; |
| close(h->epoll_fd); |
| remove_epoll_fd_from_global_list(h->epoll_fd); |
| gpr_free(h); |
| } |
| |
| static const grpc_pollset_vtable multipoll_with_epoll_pollset = { |
| multipoll_with_epoll_pollset_add_fd, |
| multipoll_with_epoll_pollset_maybe_work_and_unlock, |
| multipoll_with_epoll_pollset_finish_shutdown, |
| multipoll_with_epoll_pollset_destroy}; |
| |
| static void epoll_become_multipoller(grpc_exec_ctx *exec_ctx, |
| grpc_pollset *pollset, grpc_fd **fds, |
| size_t nfds) { |
| size_t i; |
| epoll_hdr *h = gpr_malloc(sizeof(epoll_hdr)); |
| struct epoll_event ev; |
| int err; |
| |
| pollset->vtable = &multipoll_with_epoll_pollset; |
| pollset->data.ptr = h; |
| h->epoll_fd = epoll_create1(EPOLL_CLOEXEC); |
| if (h->epoll_fd < 0) { |
| /* TODO(klempner): Fall back to poll here, especially on ENOSYS */ |
| gpr_log(GPR_ERROR, "epoll_create1 failed: %s", strerror(errno)); |
| abort(); |
| } |
| add_epoll_fd_to_global_list(h->epoll_fd); |
| |
| ev.events = (uint32_t)(EPOLLIN | EPOLLET); |
| ev.data.ptr = NULL; |
| err = epoll_ctl(h->epoll_fd, EPOLL_CTL_ADD, |
| GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd), &ev); |
| if (err < 0) { |
| gpr_log(GPR_ERROR, "epoll_ctl add for %d failed: %s", |
| GRPC_WAKEUP_FD_GET_READ_FD(&grpc_global_wakeup_fd), |
| strerror(errno)); |
| } |
| |
| for (i = 0; i < nfds; i++) { |
| multipoll_with_epoll_pollset_add_fd(exec_ctx, pollset, fds[i], 0); |
| } |
| } |
| |
| #else /* GPR_LINUX_MULTIPOLL_WITH_EPOLL */ |
| |
| static void remove_fd_from_all_epoll_sets(int fd) {} |
| |
| #endif /* GPR_LINUX_MULTIPOLL_WITH_EPOLL */ |
| |
| /******************************************************************************* |
| * pollset_set_posix.c |
| */ |
| |
| static grpc_pollset_set *pollset_set_create(void) { |
| grpc_pollset_set *pollset_set = gpr_malloc(sizeof(*pollset_set)); |
| memset(pollset_set, 0, sizeof(*pollset_set)); |
| gpr_mu_init(&pollset_set->mu); |
| return pollset_set; |
| } |
| |
| static void pollset_set_destroy(grpc_pollset_set *pollset_set) { |
| size_t i; |
| gpr_mu_destroy(&pollset_set->mu); |
| for (i = 0; i < pollset_set->fd_count; i++) { |
| GRPC_FD_UNREF(pollset_set->fds[i], "pollset_set"); |
| } |
| gpr_free(pollset_set->pollsets); |
| gpr_free(pollset_set->pollset_sets); |
| gpr_free(pollset_set->fds); |
| gpr_free(pollset_set); |
| } |
| |
| static void pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, |
| grpc_pollset *pollset) { |
| size_t i, j; |
| gpr_mu_lock(&pollset_set->mu); |
| if (pollset_set->pollset_count == pollset_set->pollset_capacity) { |
| pollset_set->pollset_capacity = |
| GPR_MAX(8, 2 * pollset_set->pollset_capacity); |
| pollset_set->pollsets = |
| gpr_realloc(pollset_set->pollsets, pollset_set->pollset_capacity * |
| sizeof(*pollset_set->pollsets)); |
| } |
| pollset_set->pollsets[pollset_set->pollset_count++] = pollset; |
| for (i = 0, j = 0; i < pollset_set->fd_count; i++) { |
| if (fd_is_orphaned(pollset_set->fds[i])) { |
| GRPC_FD_UNREF(pollset_set->fds[i], "pollset_set"); |
| } else { |
| pollset_add_fd(exec_ctx, pollset, pollset_set->fds[i]); |
| pollset_set->fds[j++] = pollset_set->fds[i]; |
| } |
| } |
| pollset_set->fd_count = j; |
| gpr_mu_unlock(&pollset_set->mu); |
| } |
| |
| static void pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, |
| grpc_pollset *pollset) { |
| size_t i; |
| gpr_mu_lock(&pollset_set->mu); |
| for (i = 0; i < pollset_set->pollset_count; i++) { |
| if (pollset_set->pollsets[i] == pollset) { |
| pollset_set->pollset_count--; |
| GPR_SWAP(grpc_pollset *, pollset_set->pollsets[i], |
| pollset_set->pollsets[pollset_set->pollset_count]); |
| break; |
| } |
| } |
| gpr_mu_unlock(&pollset_set->mu); |
| } |
| |
| static void pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *bag, |
| grpc_pollset_set *item) { |
| size_t i, j; |
| gpr_mu_lock(&bag->mu); |
| if (bag->pollset_set_count == bag->pollset_set_capacity) { |
| bag->pollset_set_capacity = GPR_MAX(8, 2 * bag->pollset_set_capacity); |
| bag->pollset_sets = |
| gpr_realloc(bag->pollset_sets, |
| bag->pollset_set_capacity * sizeof(*bag->pollset_sets)); |
| } |
| bag->pollset_sets[bag->pollset_set_count++] = item; |
| for (i = 0, j = 0; i < bag->fd_count; i++) { |
| if (fd_is_orphaned(bag->fds[i])) { |
| GRPC_FD_UNREF(bag->fds[i], "pollset_set"); |
| } else { |
| pollset_set_add_fd(exec_ctx, item, bag->fds[i]); |
| bag->fds[j++] = bag->fds[i]; |
| } |
| } |
| bag->fd_count = j; |
| gpr_mu_unlock(&bag->mu); |
| } |
| |
| static void pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *bag, |
| grpc_pollset_set *item) { |
| size_t i; |
| gpr_mu_lock(&bag->mu); |
| for (i = 0; i < bag->pollset_set_count; i++) { |
| if (bag->pollset_sets[i] == item) { |
| bag->pollset_set_count--; |
| GPR_SWAP(grpc_pollset_set *, bag->pollset_sets[i], |
| bag->pollset_sets[bag->pollset_set_count]); |
| break; |
| } |
| } |
| gpr_mu_unlock(&bag->mu); |
| } |
| |
| static void pollset_set_add_fd(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, grpc_fd *fd) { |
| size_t i; |
| gpr_mu_lock(&pollset_set->mu); |
| if (pollset_set->fd_count == pollset_set->fd_capacity) { |
| pollset_set->fd_capacity = GPR_MAX(8, 2 * pollset_set->fd_capacity); |
| pollset_set->fds = gpr_realloc( |
| pollset_set->fds, pollset_set->fd_capacity * sizeof(*pollset_set->fds)); |
| } |
| GRPC_FD_REF(fd, "pollset_set"); |
| pollset_set->fds[pollset_set->fd_count++] = fd; |
| for (i = 0; i < pollset_set->pollset_count; i++) { |
| pollset_add_fd(exec_ctx, pollset_set->pollsets[i], fd); |
| } |
| for (i = 0; i < pollset_set->pollset_set_count; i++) { |
| pollset_set_add_fd(exec_ctx, pollset_set->pollset_sets[i], fd); |
| } |
| gpr_mu_unlock(&pollset_set->mu); |
| } |
| |
| static void pollset_set_del_fd(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, grpc_fd *fd) { |
| size_t i; |
| gpr_mu_lock(&pollset_set->mu); |
| for (i = 0; i < pollset_set->fd_count; i++) { |
| if (pollset_set->fds[i] == fd) { |
| pollset_set->fd_count--; |
| GPR_SWAP(grpc_fd *, pollset_set->fds[i], |
| pollset_set->fds[pollset_set->fd_count]); |
| GRPC_FD_UNREF(fd, "pollset_set"); |
| break; |
| } |
| } |
| for (i = 0; i < pollset_set->pollset_set_count; i++) { |
| pollset_set_del_fd(exec_ctx, pollset_set->pollset_sets[i], fd); |
| } |
| gpr_mu_unlock(&pollset_set->mu); |
| } |
| |
| /******************************************************************************* |
| * event engine binding |
| */ |
| |
| static void shutdown_engine(void) { |
| fd_global_shutdown(); |
| pollset_global_shutdown(); |
| } |
| |
| static const grpc_event_engine_vtable vtable = { |
| .pollset_size = sizeof(grpc_pollset), |
| |
| .fd_create = fd_create, |
| .fd_wrapped_fd = fd_wrapped_fd, |
| .fd_orphan = fd_orphan, |
| .fd_shutdown = fd_shutdown, |
| .fd_notify_on_read = fd_notify_on_read, |
| .fd_notify_on_write = fd_notify_on_write, |
| .fd_get_read_notifier_pollset = fd_get_read_notifier_pollset, |
| |
| .pollset_init = pollset_init, |
| .pollset_shutdown = pollset_shutdown, |
| .pollset_reset = pollset_reset, |
| .pollset_destroy = pollset_destroy, |
| .pollset_work = pollset_work, |
| .pollset_kick = pollset_kick, |
| .pollset_add_fd = pollset_add_fd, |
| |
| .pollset_set_create = pollset_set_create, |
| .pollset_set_destroy = pollset_set_destroy, |
| .pollset_set_add_pollset = pollset_set_add_pollset, |
| .pollset_set_del_pollset = pollset_set_del_pollset, |
| .pollset_set_add_pollset_set = pollset_set_add_pollset_set, |
| .pollset_set_del_pollset_set = pollset_set_del_pollset_set, |
| .pollset_set_add_fd = pollset_set_add_fd, |
| .pollset_set_del_fd = pollset_set_del_fd, |
| |
| .kick_poller = kick_poller, |
| |
| .shutdown_engine = shutdown_engine, |
| }; |
| |
| const grpc_event_engine_vtable *grpc_init_poll_and_epoll_posix(void) { |
| #ifdef GPR_LINUX_MULTIPOLL_WITH_EPOLL |
| platform_become_multipoller = epoll_become_multipoller; |
| #else |
| platform_become_multipoller = poll_become_multipoller; |
| #endif |
| fd_global_init(); |
| pollset_global_init(); |
| return &vtable; |
| } |
| |
| #endif |