80 lines
1.9 KiB
C++
80 lines
1.9 KiB
C++
/*
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* Copyright 2019 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#include "api/task_queue/task_queue_base.h"
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#include "absl/base/attributes.h"
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#include "absl/base/config.h"
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#include "rtc_base/checks.h"
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#if defined(ABSL_HAVE_THREAD_LOCAL)
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namespace webrtc {
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namespace {
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ABSL_CONST_INIT thread_local TaskQueueBase* current = nullptr;
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} // namespace
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TaskQueueBase* TaskQueueBase::Current() {
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return current;
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}
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TaskQueueBase::CurrentTaskQueueSetter::CurrentTaskQueueSetter(
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TaskQueueBase* task_queue)
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: previous_(current) {
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current = task_queue;
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}
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TaskQueueBase::CurrentTaskQueueSetter::~CurrentTaskQueueSetter() {
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current = previous_;
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}
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} // namespace webrtc
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#elif defined(WEBRTC_POSIX)
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#include <pthread.h>
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namespace webrtc {
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namespace {
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ABSL_CONST_INIT pthread_key_t g_queue_ptr_tls = 0;
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void InitializeTls() {
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RTC_CHECK(pthread_key_create(&g_queue_ptr_tls, nullptr) == 0);
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}
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pthread_key_t GetQueuePtrTls() {
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static pthread_once_t init_once = PTHREAD_ONCE_INIT;
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RTC_CHECK(pthread_once(&init_once, &InitializeTls) == 0);
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return g_queue_ptr_tls;
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}
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} // namespace
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TaskQueueBase* TaskQueueBase::Current() {
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return static_cast<TaskQueueBase*>(pthread_getspecific(GetQueuePtrTls()));
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}
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TaskQueueBase::CurrentTaskQueueSetter::CurrentTaskQueueSetter(
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TaskQueueBase* task_queue)
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: previous_(TaskQueueBase::Current()) {
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pthread_setspecific(GetQueuePtrTls(), task_queue);
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}
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TaskQueueBase::CurrentTaskQueueSetter::~CurrentTaskQueueSetter() {
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pthread_setspecific(GetQueuePtrTls(), previous_);
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}
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} // namespace webrtc
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#else
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#error Unsupported platform
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#endif
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