| /* |
| * |
| * 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. |
| * |
| */ |
| |
| #include "src/core/iomgr/iomgr.h" |
| |
| #include <stdlib.h> |
| |
| #include "src/core/iomgr/iomgr_internal.h" |
| #include "src/core/iomgr/alarm_internal.h" |
| #include "src/core/support/string.h" |
| #include <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/string_util.h> |
| #include <grpc/support/sync.h> |
| #include <grpc/support/thd.h> |
| |
| static gpr_mu g_mu; |
| static gpr_cv g_rcv; |
| static grpc_iomgr_closure *g_cbs_head = NULL; |
| static grpc_iomgr_closure *g_cbs_tail = NULL; |
| static int g_shutdown; |
| static gpr_event g_background_callback_executor_done; |
| static grpc_iomgr_object g_root_object; |
| |
| /* Execute followup callbacks continuously. |
| Other threads may check in and help during pollset_work() */ |
| static void background_callback_executor(void *ignored) { |
| gpr_mu_lock(&g_mu); |
| while (!g_shutdown) { |
| gpr_timespec deadline = gpr_inf_future; |
| gpr_timespec short_deadline = |
| gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(100)); |
| if (g_cbs_head) { |
| grpc_iomgr_closure *closure = g_cbs_head; |
| g_cbs_head = closure->next; |
| if (!g_cbs_head) g_cbs_tail = NULL; |
| gpr_mu_unlock(&g_mu); |
| closure->cb(closure->cb_arg, closure->success); |
| gpr_mu_lock(&g_mu); |
| } else if (grpc_alarm_check(&g_mu, gpr_now(GPR_CLOCK_REALTIME), |
| &deadline)) { |
| } else { |
| gpr_mu_unlock(&g_mu); |
| gpr_sleep_until(gpr_time_min(short_deadline, deadline)); |
| gpr_mu_lock(&g_mu); |
| } |
| } |
| gpr_mu_unlock(&g_mu); |
| gpr_event_set(&g_background_callback_executor_done, (void *)1); |
| } |
| |
| void grpc_kick_poller(void) { |
| /* Empty. The background callback executor polls periodically. The activity |
| * the kicker is trying to draw the executor's attention to will be picked up |
| * either by one of the periodic wakeups or by one of the polling application |
| * threads. */ |
| } |
| |
| void grpc_iomgr_init(void) { |
| gpr_thd_id id; |
| gpr_mu_init(&g_mu); |
| gpr_cv_init(&g_rcv); |
| grpc_alarm_list_init(gpr_now(GPR_CLOCK_REALTIME)); |
| g_root_object.next = g_root_object.prev = &g_root_object; |
| g_root_object.name = "root"; |
| grpc_iomgr_platform_init(); |
| gpr_event_init(&g_background_callback_executor_done); |
| gpr_thd_new(&id, background_callback_executor, NULL, NULL); |
| } |
| |
| static size_t count_objects(void) { |
| grpc_iomgr_object *obj; |
| size_t n = 0; |
| for (obj = g_root_object.next; obj != &g_root_object; obj = obj->next) { |
| n++; |
| } |
| return n; |
| } |
| |
| void grpc_iomgr_shutdown(void) { |
| grpc_iomgr_object *obj; |
| grpc_iomgr_closure *closure; |
| gpr_timespec shutdown_deadline = |
| gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_seconds(10)); |
| |
| gpr_mu_lock(&g_mu); |
| g_shutdown = 1; |
| while (g_cbs_head != NULL || g_root_object.next != &g_root_object) { |
| if (g_cbs_head != NULL && g_root_object.next != &g_root_object) { |
| gpr_log(GPR_DEBUG, |
| "Waiting for %d iomgr objects to be destroyed and executing " |
| "final callbacks", |
| count_objects()); |
| } else if (g_cbs_head != NULL) { |
| gpr_log(GPR_DEBUG, "Executing final iomgr callbacks"); |
| } else { |
| gpr_log(GPR_DEBUG, "Waiting for %d iomgr objects to be destroyed", |
| count_objects()); |
| } |
| if (g_cbs_head) { |
| do { |
| closure = g_cbs_head; |
| g_cbs_head = closure->next; |
| if (!g_cbs_head) g_cbs_tail = NULL; |
| gpr_mu_unlock(&g_mu); |
| |
| closure->cb(closure->cb_arg, 0); |
| gpr_mu_lock(&g_mu); |
| } while (g_cbs_head); |
| continue; |
| } |
| if (grpc_alarm_check(&g_mu, gpr_inf_future, NULL)) { |
| gpr_log(GPR_DEBUG, "got late alarm"); |
| continue; |
| } |
| if (g_root_object.next != &g_root_object) { |
| int timeout = 0; |
| gpr_timespec short_deadline = |
| gpr_time_add(gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(100)); |
| while (gpr_cv_wait(&g_rcv, &g_mu, short_deadline) && g_cbs_head == NULL) { |
| if (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), shutdown_deadline) > 0) { |
| timeout = 1; |
| break; |
| } |
| } |
| if (timeout) { |
| gpr_log(GPR_DEBUG, |
| "Failed to free %d iomgr objects before shutdown deadline: " |
| "memory leaks are likely", |
| count_objects()); |
| for (obj = g_root_object.next; obj != &g_root_object; obj = obj->next) { |
| gpr_log(GPR_DEBUG, "LEAKED OBJECT: %s", obj->name); |
| } |
| break; |
| } |
| } |
| } |
| gpr_mu_unlock(&g_mu); |
| |
| grpc_kick_poller(); |
| gpr_event_wait(&g_background_callback_executor_done, gpr_inf_future); |
| |
| grpc_alarm_list_shutdown(); |
| |
| grpc_iomgr_platform_shutdown(); |
| gpr_mu_destroy(&g_mu); |
| gpr_cv_destroy(&g_rcv); |
| } |
| |
| void grpc_iomgr_register_object(grpc_iomgr_object *obj, const char *name) { |
| gpr_mu_lock(&g_mu); |
| obj->name = gpr_strdup(name); |
| obj->next = &g_root_object; |
| obj->prev = obj->next->prev; |
| obj->next->prev = obj->prev->next = obj; |
| gpr_mu_unlock(&g_mu); |
| } |
| |
| void grpc_iomgr_unregister_object(grpc_iomgr_object *obj) { |
| gpr_mu_lock(&g_mu); |
| obj->next->prev = obj->prev; |
| obj->prev->next = obj->next; |
| gpr_free(obj->name); |
| gpr_cv_signal(&g_rcv); |
| gpr_mu_unlock(&g_mu); |
| } |
| |
| void grpc_iomgr_closure_init(grpc_iomgr_closure *closure, grpc_iomgr_cb_func cb, |
| void *cb_arg) { |
| closure->cb = cb; |
| closure->cb_arg = cb_arg; |
| closure->next = NULL; |
| } |
| |
| void grpc_iomgr_add_delayed_callback(grpc_iomgr_closure *closure, int success) { |
| closure->success = success; |
| gpr_mu_lock(&g_mu); |
| closure->next = NULL; |
| if (!g_cbs_tail) { |
| g_cbs_head = g_cbs_tail = closure; |
| } else { |
| g_cbs_tail->next = closure; |
| g_cbs_tail = closure; |
| } |
| if (g_shutdown) { |
| gpr_cv_signal(&g_rcv); |
| } |
| gpr_mu_unlock(&g_mu); |
| } |
| |
| void grpc_iomgr_add_callback(grpc_iomgr_closure *closure) { |
| grpc_iomgr_add_delayed_callback(closure, 1 /* GPR_TRUE */); |
| } |
| |
| int grpc_maybe_call_delayed_callbacks(gpr_mu *drop_mu, int success) { |
| int n = 0; |
| gpr_mu *retake_mu = NULL; |
| grpc_iomgr_closure *closure; |
| for (;;) { |
| /* check for new work */ |
| if (!gpr_mu_trylock(&g_mu)) { |
| break; |
| } |
| closure = g_cbs_head; |
| if (!closure) { |
| gpr_mu_unlock(&g_mu); |
| break; |
| } |
| g_cbs_head = closure->next; |
| if (!g_cbs_head) g_cbs_tail = NULL; |
| gpr_mu_unlock(&g_mu); |
| /* if we have a mutex to drop, do so before executing work */ |
| if (drop_mu) { |
| gpr_mu_unlock(drop_mu); |
| retake_mu = drop_mu; |
| drop_mu = NULL; |
| } |
| closure->cb(closure->cb_arg, success && closure->success); |
| n++; |
| } |
| if (retake_mu) { |
| gpr_mu_lock(retake_mu); |
| } |
| return n; |
| } |