| /* |
| * |
| * 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 <grpc/support/alloc.h> |
| #include <grpc/support/log.h> |
| #include <grpc/support/thd.h> |
| #include <grpc/support/sync.h> |
| |
| typedef struct delayed_callback { |
| grpc_iomgr_cb_func cb; |
| void *cb_arg; |
| int success; |
| struct delayed_callback *next; |
| } delayed_callback; |
| |
| static gpr_mu g_mu; |
| static gpr_cv g_cv; |
| static gpr_cv g_rcv; |
| static delayed_callback *g_cbs_head = NULL; |
| static delayed_callback *g_cbs_tail = NULL; |
| static int g_shutdown; |
| static int g_refs; |
| static gpr_event g_background_callback_executor_done; |
| |
| /* 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; |
| if (g_cbs_head) { |
| delayed_callback *cb = g_cbs_head; |
| g_cbs_head = cb->next; |
| if (!g_cbs_head) g_cbs_tail = NULL; |
| gpr_mu_unlock(&g_mu); |
| cb->cb(cb->cb_arg, cb->success); |
| gpr_free(cb); |
| gpr_mu_lock(&g_mu); |
| } else if (grpc_alarm_check(&g_mu, gpr_now(), &deadline)) { |
| } else { |
| gpr_cv_wait(&g_cv, &g_mu, deadline); |
| } |
| } |
| gpr_mu_unlock(&g_mu); |
| gpr_event_set(&g_background_callback_executor_done, (void *)1); |
| } |
| |
| void grpc_kick_poller(void) { gpr_cv_broadcast(&g_cv); } |
| |
| void grpc_iomgr_init(void) { |
| gpr_thd_id id; |
| gpr_mu_init(&g_mu); |
| gpr_cv_init(&g_cv); |
| gpr_cv_init(&g_rcv); |
| grpc_alarm_list_init(gpr_now()); |
| g_refs = 0; |
| grpc_iomgr_platform_init(); |
| gpr_event_init(&g_background_callback_executor_done); |
| gpr_thd_new(&id, background_callback_executor, NULL, NULL); |
| } |
| |
| void grpc_iomgr_shutdown(void) { |
| delayed_callback *cb; |
| gpr_timespec shutdown_deadline = |
| gpr_time_add(gpr_now(), gpr_time_from_seconds(10)); |
| |
| |
| gpr_mu_lock(&g_mu); |
| g_shutdown = 1; |
| while (g_cbs_head || g_refs) { |
| gpr_log(GPR_DEBUG, "Waiting for %d iomgr objects to be destroyed%s", g_refs, |
| g_cbs_head ? " and executing final callbacks" : ""); |
| while (g_cbs_head) { |
| cb = g_cbs_head; |
| g_cbs_head = cb->next; |
| if (!g_cbs_head) g_cbs_tail = NULL; |
| gpr_mu_unlock(&g_mu); |
| |
| cb->cb(cb->cb_arg, 0); |
| gpr_free(cb); |
| gpr_mu_lock(&g_mu); |
| } |
| if (g_refs) { |
| int timeout = 0; |
| gpr_timespec short_deadline = gpr_time_add(gpr_now(), |
| 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(), 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", |
| g_refs); |
| break; |
| } |
| } |
| } |
| gpr_mu_unlock(&g_mu); |
| |
| grpc_kick_poller(); |
| gpr_event_wait(&g_background_callback_executor_done, gpr_inf_future); |
| |
| grpc_iomgr_platform_shutdown(); |
| grpc_alarm_list_shutdown(); |
| gpr_mu_destroy(&g_mu); |
| gpr_cv_destroy(&g_cv); |
| gpr_cv_destroy(&g_rcv); |
| } |
| |
| void grpc_iomgr_ref(void) { |
| gpr_mu_lock(&g_mu); |
| ++g_refs; |
| gpr_mu_unlock(&g_mu); |
| } |
| |
| void grpc_iomgr_unref(void) { |
| gpr_mu_lock(&g_mu); |
| if (0 == --g_refs) { |
| gpr_cv_signal(&g_rcv); |
| } |
| gpr_mu_unlock(&g_mu); |
| } |
| |
| void grpc_iomgr_add_delayed_callback(grpc_iomgr_cb_func cb, void *cb_arg, |
| int success) { |
| delayed_callback *dcb = gpr_malloc(sizeof(delayed_callback)); |
| dcb->cb = cb; |
| dcb->cb_arg = cb_arg; |
| dcb->success = success; |
| gpr_mu_lock(&g_mu); |
| dcb->next = NULL; |
| if (!g_cbs_tail) { |
| g_cbs_head = g_cbs_tail = dcb; |
| } else { |
| g_cbs_tail->next = dcb; |
| g_cbs_tail = dcb; |
| } |
| gpr_cv_signal(&g_cv); |
| gpr_mu_unlock(&g_mu); |
| } |
| |
| void grpc_iomgr_add_callback(grpc_iomgr_cb_func cb, void *cb_arg) { |
| grpc_iomgr_add_delayed_callback(cb, cb_arg, 1); |
| } |
| |
| int grpc_maybe_call_delayed_callbacks(gpr_mu *drop_mu, int success) { |
| int n = 0; |
| gpr_mu *retake_mu = NULL; |
| delayed_callback *cb; |
| for (;;) { |
| /* check for new work */ |
| if (!gpr_mu_trylock(&g_mu)) { |
| break; |
| } |
| cb = g_cbs_head; |
| if (!cb) { |
| gpr_mu_unlock(&g_mu); |
| break; |
| } |
| g_cbs_head = cb->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; |
| } |
| cb->cb(cb->cb_arg, success && cb->success); |
| gpr_free(cb); |
| n++; |
| } |
| if (retake_mu) { |
| gpr_mu_lock(retake_mu); |
| } |
| return n; |
| } |