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/*
*
* 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/iomgr.h"
#include <stdlib.h>
#include <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>
#include <grpc/support/useful.h>
#include "src/core/lib/iomgr/exec_ctx.h"
#include "src/core/lib/iomgr/iomgr_internal.h"
#include "src/core/lib/iomgr/network_status_tracker.h"
#include "src/core/lib/iomgr/timer.h"
#include "src/core/lib/iomgr/timer_manager.h"
#include "src/core/lib/support/env.h"
#include "src/core/lib/support/string.h"
static gpr_mu g_mu;
static gpr_cv g_rcv;
static int g_shutdown;
static grpc_iomgr_object g_root_object;
void grpc_iomgr_init(void) {
g_shutdown = 0;
gpr_mu_init(&g_mu);
gpr_cv_init(&g_rcv);
grpc_exec_ctx_global_init();
grpc_timer_list_init(gpr_now(GPR_CLOCK_MONOTONIC));
g_root_object.next = g_root_object.prev = &g_root_object;
g_root_object.name = "root";
grpc_network_status_init();
grpc_iomgr_platform_init();
}
void grpc_iomgr_start(void) { grpc_timer_manager_init(); }
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;
}
static void dump_objects(const char *kind) {
grpc_iomgr_object *obj;
for (obj = g_root_object.next; obj != &g_root_object; obj = obj->next) {
gpr_log(GPR_DEBUG, "%s OBJECT: %s %p", kind, obj->name, obj);
}
}
void grpc_iomgr_shutdown(grpc_exec_ctx *exec_ctx) {
gpr_timespec shutdown_deadline = gpr_time_add(
gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_seconds(10, GPR_TIMESPAN));
gpr_timespec last_warning_time = gpr_now(GPR_CLOCK_REALTIME);
grpc_timer_manager_shutdown();
grpc_iomgr_platform_flush();
gpr_mu_lock(&g_mu);
g_shutdown = 1;
while (g_root_object.next != &g_root_object) {
if (gpr_time_cmp(
gpr_time_sub(gpr_now(GPR_CLOCK_REALTIME), last_warning_time),
gpr_time_from_seconds(1, GPR_TIMESPAN)) >= 0) {
if (g_root_object.next != &g_root_object) {
gpr_log(GPR_DEBUG,
"Waiting for %" PRIuPTR " iomgr objects to be destroyed",
count_objects());
}
last_warning_time = gpr_now(GPR_CLOCK_REALTIME);
}
if (grpc_timer_check(exec_ctx, gpr_inf_future(GPR_CLOCK_MONOTONIC), NULL) ==
GRPC_TIMERS_FIRED) {
gpr_mu_unlock(&g_mu);
grpc_exec_ctx_flush(exec_ctx);
grpc_iomgr_platform_flush();
gpr_mu_lock(&g_mu);
continue;
}
if (g_root_object.next != &g_root_object) {
if (grpc_iomgr_abort_on_leaks()) {
gpr_log(GPR_DEBUG, "Failed to free %" PRIuPTR
" iomgr objects before shutdown deadline: "
"memory leaks are likely",
count_objects());
dump_objects("LEAKED");
abort();
}
gpr_timespec short_deadline = gpr_time_add(
gpr_now(GPR_CLOCK_REALTIME), gpr_time_from_millis(100, GPR_TIMESPAN));
if (gpr_cv_wait(&g_rcv, &g_mu, short_deadline)) {
if (gpr_time_cmp(gpr_now(GPR_CLOCK_REALTIME), shutdown_deadline) > 0) {
if (g_root_object.next != &g_root_object) {
gpr_log(GPR_DEBUG, "Failed to free %" PRIuPTR
" iomgr objects before shutdown deadline: "
"memory leaks are likely",
count_objects());
dump_objects("LEAKED");
}
break;
}
}
}
}
gpr_mu_unlock(&g_mu);
grpc_timer_list_shutdown(exec_ctx);
grpc_exec_ctx_flush(exec_ctx);
/* ensure all threads have left g_mu */
gpr_mu_lock(&g_mu);
gpr_mu_unlock(&g_mu);
grpc_iomgr_platform_shutdown();
grpc_exec_ctx_global_shutdown();
grpc_network_status_shutdown();
gpr_mu_destroy(&g_mu);
gpr_cv_destroy(&g_rcv);
}
void grpc_iomgr_register_object(grpc_iomgr_object *obj, const char *name) {
obj->name = gpr_strdup(name);
gpr_mu_lock(&g_mu);
obj->next = &g_root_object;
obj->prev = g_root_object.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_cv_signal(&g_rcv);
gpr_mu_unlock(&g_mu);
gpr_free(obj->name);
}
bool grpc_iomgr_abort_on_leaks(void) {
char *env = gpr_getenv("GRPC_ABORT_ON_LEAKS");
if (env == NULL) return false;
static const char *truthy[] = {"yes", "Yes", "YES", "true",
"True", "TRUE", "1"};
bool should_we = false;
for (size_t i = 0; i < GPR_ARRAY_SIZE(truthy); i++) {
if (0 == strcmp(env, truthy[i])) should_we = true;
}
gpr_free(env);
return should_we;
}
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