61abe15829
Due to quirks of the Cocoa runtime several platform-specific fixes were in place. See the deleted files maccocoathreadhelper and scoped_autorelease_pool for examples. There is no way to do a stack-based RAII autoreleasepool that is compatible with ARC, and autoreleasepool blocks can't be used with c++. The solution was to separate out the implementation of some methods in thread.h to an ObjC++ file for Darwin platforms, allowing us to get rid of the helper classes and enable ARC everywhere. BUG=webrtc:6412 Review-Url: https://codereview.webrtc.org/2784483002 Cr-Commit-Position: refs/heads/master@{#17436}
94 lines
2.3 KiB
Plaintext
94 lines
2.3 KiB
Plaintext
/*
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* Copyright 2017 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 "webrtc/base/thread.h"
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#import <Foundation/Foundation.h>
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#include "webrtc/base/platform_thread.h"
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/*
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* This file contains platform-specific implementations for several
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* methods in rtc::Thread.
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*/
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namespace {
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void InitCocoaMultiThreading() {
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if ([NSThread isMultiThreaded] == NO) {
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// The sole purpose of this autorelease pool is to avoid a console
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// message on Leopard that tells us we're autoreleasing the thread
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// with no autorelease pool in place.
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@autoreleasepool {
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[NSThread detachNewThreadSelector:@selector(class)
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toTarget:[NSObject class]
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withObject:nil];
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}
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}
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RTC_DCHECK([NSThread isMultiThreaded]);
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}
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}
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namespace rtc {
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ThreadManager::ThreadManager() {
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pthread_key_create(&key_, nullptr);
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#ifndef NO_MAIN_THREAD_WRAPPING
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WrapCurrentThread();
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#endif
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// This is necessary to alert the cocoa runtime of the fact that
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// we are running in a multithreaded environment.
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InitCocoaMultiThreading();
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}
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ThreadManager::~ThreadManager() {
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@autoreleasepool {
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UnwrapCurrentThread();
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pthread_key_delete(key_);
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}
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}
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// static
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void* Thread::PreRun(void* pv) {
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ThreadInit* init = static_cast<ThreadInit*>(pv);
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ThreadManager::Instance()->SetCurrentThread(init->thread);
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rtc::SetCurrentThreadName(init->thread->name_.c_str());
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@autoreleasepool {
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if (init->runnable) {
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init->runnable->Run(init->thread);
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} else {
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init->thread->Run();
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}
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}
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delete init;
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return nullptr;
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}
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bool Thread::ProcessMessages(int cmsLoop) {
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int64_t msEnd = (kForever == cmsLoop) ? 0 : TimeAfter(cmsLoop);
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int cmsNext = cmsLoop;
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while (true) {
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@autoreleasepool {
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Message msg;
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if (!Get(&msg, cmsNext))
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return !IsQuitting();
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Dispatch(&msg);
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if (cmsLoop != kForever) {
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cmsNext = static_cast<int>(TimeUntil(msEnd));
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if (cmsNext < 0)
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return true;
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}
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}
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}
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}
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} // namespace rtc
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