| /* |
| * |
| * Copyright 2015 gRPC authors. |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| * |
| */ |
| |
| #include "src/core/lib/iomgr/port.h" |
| |
| #ifdef GRPC_POSIX_SOCKET |
| |
| #include "src/core/lib/iomgr/ev_posix.h" |
| |
| #include <string.h> |
| |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/useful.h> |
| |
| #include "src/core/lib/debug/trace.h" |
| #include "src/core/lib/iomgr/ev_epoll1_linux.h" |
| #include "src/core/lib/iomgr/ev_epollex_linux.h" |
| #include "src/core/lib/iomgr/ev_epollsig_linux.h" |
| #include "src/core/lib/iomgr/ev_poll_posix.h" |
| #include "src/core/lib/support/env.h" |
| |
| grpc_tracer_flag grpc_polling_trace = |
| GRPC_TRACER_INITIALIZER(false, "polling"); /* Disabled by default */ |
| |
| #ifndef NDEBUG |
| grpc_tracer_flag grpc_trace_fd_refcount = |
| GRPC_TRACER_INITIALIZER(false, "fd_refcount"); |
| #endif |
| |
| /** Default poll() function - a pointer so that it can be overridden by some |
| * tests */ |
| grpc_poll_function_type grpc_poll_function = poll; |
| |
| grpc_wakeup_fd grpc_global_wakeup_fd; |
| |
| static const grpc_event_engine_vtable *g_event_engine; |
| static const char *g_poll_strategy_name = NULL; |
| |
| typedef const grpc_event_engine_vtable *(*event_engine_factory_fn)( |
| bool explicit_request); |
| |
| typedef struct { |
| const char *name; |
| event_engine_factory_fn factory; |
| } event_engine_factory; |
| |
| namespace { |
| |
| extern "C" { |
| |
| grpc_poll_function_type real_poll_function; |
| |
| int dummy_poll(struct pollfd fds[], nfds_t nfds, int timeout) { |
| if (timeout == 0) { |
| return real_poll_function(fds, nfds, 0); |
| } else { |
| gpr_log(GPR_ERROR, "Attempted a blocking poll when declared non-polling."); |
| GPR_ASSERT(false); |
| return -1; |
| } |
| } |
| } // extern "C" |
| |
| const grpc_event_engine_vtable *init_non_polling(bool explicit_request) { |
| if (!explicit_request) { |
| return nullptr; |
| } |
| // return the simplest engine as a dummy but also override the poller |
| auto ret = grpc_init_poll_posix(explicit_request); |
| real_poll_function = grpc_poll_function; |
| grpc_poll_function = dummy_poll; |
| |
| return ret; |
| } |
| } // namespace |
| |
| static const event_engine_factory g_factories[] = { |
| {"epollex", grpc_init_epollex_linux}, {"epoll1", grpc_init_epoll1_linux}, |
| {"epollsig", grpc_init_epollsig_linux}, {"poll", grpc_init_poll_posix}, |
| {"poll-cv", grpc_init_poll_cv_posix}, {"none", init_non_polling}, |
| }; |
| |
| static void add(const char *beg, const char *end, char ***ss, size_t *ns) { |
| size_t n = *ns; |
| size_t np = n + 1; |
| char *s; |
| size_t len; |
| GPR_ASSERT(end >= beg); |
| len = (size_t)(end - beg); |
| s = (char *)gpr_malloc(len + 1); |
| memcpy(s, beg, len); |
| s[len] = 0; |
| *ss = (char **)gpr_realloc(*ss, sizeof(char **) * np); |
| (*ss)[n] = s; |
| *ns = np; |
| } |
| |
| static void split(const char *s, char ***ss, size_t *ns) { |
| const char *c = strchr(s, ','); |
| if (c == NULL) { |
| add(s, s + strlen(s), ss, ns); |
| } else { |
| add(s, c, ss, ns); |
| split(c + 1, ss, ns); |
| } |
| } |
| |
| static bool is(const char *want, const char *have) { |
| return 0 == strcmp(want, "all") || 0 == strcmp(want, have); |
| } |
| |
| static void try_engine(const char *engine) { |
| for (size_t i = 0; i < GPR_ARRAY_SIZE(g_factories); i++) { |
| if (is(engine, g_factories[i].name)) { |
| if ((g_event_engine = g_factories[i].factory( |
| 0 == strcmp(engine, g_factories[i].name)))) { |
| g_poll_strategy_name = g_factories[i].name; |
| gpr_log(GPR_DEBUG, "Using polling engine: %s", g_factories[i].name); |
| return; |
| } |
| } |
| } |
| } |
| |
| /* This should be used for testing purposes ONLY */ |
| void grpc_set_event_engine_test_only( |
| const grpc_event_engine_vtable *ev_engine) { |
| g_event_engine = ev_engine; |
| } |
| |
| const grpc_event_engine_vtable *grpc_get_event_engine_test_only() { |
| return g_event_engine; |
| } |
| |
| /* Call this only after calling grpc_event_engine_init() */ |
| const char *grpc_get_poll_strategy_name() { return g_poll_strategy_name; } |
| |
| void grpc_event_engine_init(void) { |
| grpc_register_tracer(&grpc_polling_trace); |
| |
| char *s = gpr_getenv("GRPC_POLL_STRATEGY"); |
| if (s == NULL) { |
| s = gpr_strdup("all"); |
| } |
| |
| char **strings = NULL; |
| size_t nstrings = 0; |
| split(s, &strings, &nstrings); |
| |
| for (size_t i = 0; g_event_engine == NULL && i < nstrings; i++) { |
| try_engine(strings[i]); |
| } |
| |
| for (size_t i = 0; i < nstrings; i++) { |
| gpr_free(strings[i]); |
| } |
| gpr_free(strings); |
| gpr_free(s); |
| |
| if (g_event_engine == NULL) { |
| gpr_log(GPR_ERROR, "No event engine could be initialized"); |
| abort(); |
| } |
| } |
| |
| void grpc_event_engine_shutdown(void) { |
| g_event_engine->shutdown_engine(); |
| g_event_engine = NULL; |
| } |
| |
| grpc_fd *grpc_fd_create(int fd, const char *name) { |
| return g_event_engine->fd_create(fd, name); |
| } |
| |
| int grpc_fd_wrapped_fd(grpc_fd *fd) { |
| return g_event_engine->fd_wrapped_fd(fd); |
| } |
| |
| void grpc_fd_orphan(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_closure *on_done, |
| int *release_fd, bool already_closed, const char *reason) { |
| g_event_engine->fd_orphan(exec_ctx, fd, on_done, release_fd, already_closed, |
| reason); |
| } |
| |
| void grpc_fd_shutdown(grpc_exec_ctx *exec_ctx, grpc_fd *fd, grpc_error *why) { |
| g_event_engine->fd_shutdown(exec_ctx, fd, why); |
| } |
| |
| bool grpc_fd_is_shutdown(grpc_fd *fd) { |
| return g_event_engine->fd_is_shutdown(fd); |
| } |
| |
| void grpc_fd_notify_on_read(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_closure *closure) { |
| g_event_engine->fd_notify_on_read(exec_ctx, fd, closure); |
| } |
| |
| void grpc_fd_notify_on_write(grpc_exec_ctx *exec_ctx, grpc_fd *fd, |
| grpc_closure *closure) { |
| g_event_engine->fd_notify_on_write(exec_ctx, fd, closure); |
| } |
| |
| size_t grpc_pollset_size(void) { return g_event_engine->pollset_size; } |
| |
| void grpc_pollset_init(grpc_pollset *pollset, gpr_mu **mu) { |
| g_event_engine->pollset_init(pollset, mu); |
| } |
| |
| void grpc_pollset_shutdown(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_closure *closure) { |
| g_event_engine->pollset_shutdown(exec_ctx, pollset, closure); |
| } |
| |
| void grpc_pollset_destroy(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset) { |
| g_event_engine->pollset_destroy(exec_ctx, pollset); |
| } |
| |
| grpc_error *grpc_pollset_work(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_pollset_worker **worker, |
| grpc_millis deadline) { |
| return g_event_engine->pollset_work(exec_ctx, pollset, worker, deadline); |
| } |
| |
| grpc_error *grpc_pollset_kick(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| grpc_pollset_worker *specific_worker) { |
| return g_event_engine->pollset_kick(exec_ctx, pollset, specific_worker); |
| } |
| |
| void grpc_pollset_add_fd(grpc_exec_ctx *exec_ctx, grpc_pollset *pollset, |
| struct grpc_fd *fd) { |
| g_event_engine->pollset_add_fd(exec_ctx, pollset, fd); |
| } |
| |
| grpc_pollset_set *grpc_pollset_set_create(void) { |
| return g_event_engine->pollset_set_create(); |
| } |
| |
| void grpc_pollset_set_destroy(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set) { |
| g_event_engine->pollset_set_destroy(exec_ctx, pollset_set); |
| } |
| |
| void grpc_pollset_set_add_pollset(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, |
| grpc_pollset *pollset) { |
| g_event_engine->pollset_set_add_pollset(exec_ctx, pollset_set, pollset); |
| } |
| |
| void grpc_pollset_set_del_pollset(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, |
| grpc_pollset *pollset) { |
| g_event_engine->pollset_set_del_pollset(exec_ctx, pollset_set, pollset); |
| } |
| |
| void grpc_pollset_set_add_pollset_set(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *bag, |
| grpc_pollset_set *item) { |
| g_event_engine->pollset_set_add_pollset_set(exec_ctx, bag, item); |
| } |
| |
| void grpc_pollset_set_del_pollset_set(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *bag, |
| grpc_pollset_set *item) { |
| g_event_engine->pollset_set_del_pollset_set(exec_ctx, bag, item); |
| } |
| |
| void grpc_pollset_set_add_fd(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, grpc_fd *fd) { |
| g_event_engine->pollset_set_add_fd(exec_ctx, pollset_set, fd); |
| } |
| |
| void grpc_pollset_set_del_fd(grpc_exec_ctx *exec_ctx, |
| grpc_pollset_set *pollset_set, grpc_fd *fd) { |
| g_event_engine->pollset_set_del_fd(exec_ctx, pollset_set, fd); |
| } |
| |
| #endif // GRPC_POSIX_SOCKET |