tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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task_queue_base.cc (1919B)

      1 /*
      2 *  Copyright 2019 The WebRTC Project Authors. All rights reserved.
      3 *
      4 *  Use of this source code is governed by a BSD-style license
      5 *  that can be found in the LICENSE file in the root of the source
      6 *  tree. An additional intellectual property rights grant can be found
      7 *  in the file PATENTS.  All contributing project authors may
      8 *  be found in the AUTHORS file in the root of the source tree.
      9 */
     10 #include "api/task_queue/task_queue_base.h"
     11 
     12 #include "absl/base/attributes.h"
     13 #include "absl/base/config.h"
     14 
     15 #if defined(ABSL_HAVE_THREAD_LOCAL)
     16 
     17 namespace webrtc {
     18 namespace {
     19 
     20 ABSL_CONST_INIT thread_local TaskQueueBase* current = nullptr;
     21 
     22 }  // namespace
     23 
     24 TaskQueueBase* TaskQueueBase::Current() {
     25  return current;
     26 }
     27 
     28 TaskQueueBase::CurrentTaskQueueSetter::CurrentTaskQueueSetter(
     29    TaskQueueBase* task_queue)
     30    : previous_(current) {
     31  current = task_queue;
     32 }
     33 
     34 TaskQueueBase::CurrentTaskQueueSetter::~CurrentTaskQueueSetter() {
     35  current = previous_;
     36 }
     37 }  // namespace webrtc
     38 
     39 #elif defined(WEBRTC_POSIX)
     40 
     41 #include <pthread.h>
     42 
     43 namespace webrtc {
     44 namespace {
     45 
     46 ABSL_CONST_INIT pthread_key_t g_queue_ptr_tls = 0;
     47 
     48 void InitializeTls() {
     49  RTC_CHECK(pthread_key_create(&g_queue_ptr_tls, nullptr) == 0);
     50 }
     51 
     52 pthread_key_t GetQueuePtrTls() {
     53  static pthread_once_t init_once = PTHREAD_ONCE_INIT;
     54  RTC_CHECK(pthread_once(&init_once, &InitializeTls) == 0);
     55  return g_queue_ptr_tls;
     56 }
     57 
     58 }  // namespace
     59 
     60 TaskQueueBase* TaskQueueBase::Current() {
     61  return static_cast<TaskQueueBase*>(pthread_getspecific(GetQueuePtrTls()));
     62 }
     63 
     64 TaskQueueBase::CurrentTaskQueueSetter::CurrentTaskQueueSetter(
     65    TaskQueueBase* task_queue)
     66    : previous_(TaskQueueBase::Current()) {
     67  pthread_setspecific(GetQueuePtrTls(), task_queue);
     68 }
     69 
     70 TaskQueueBase::CurrentTaskQueueSetter::~CurrentTaskQueueSetter() {
     71  pthread_setspecific(GetQueuePtrTls(), previous_);
     72 }
     73 
     74 }  // namespace webrtc
     75 
     76 #else
     77 #error Unsupported platform
     78 #endif