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-rw-r--r--third_party/libjingle/files/talk/base/thread.cc375
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diff --git a/third_party/libjingle/files/talk/base/thread.cc b/third_party/libjingle/files/talk/base/thread.cc
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--- a/third_party/libjingle/files/talk/base/thread.cc
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-/*
- * libjingle
- * Copyright 2004--2005, Google Inc.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are met:
- *
- * 1. Redistributions of source code must retain the above copyright notice,
- * this list of conditions and the following disclaimer.
- * 2. 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.
- * 3. The name of the author may not be used to endorse or promote products
- * derived from this software without specific prior written permission.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 AUTHOR 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.
- */
-
-#ifdef POSIX
-extern "C" {
-#include <sys/time.h>
-}
-#endif
-
-#include "talk/base/common.h"
-#include "talk/base/logging.h"
-#include "talk/base/thread.h"
-#include "talk/base/time.h"
-
-#define MSDEV_SET_THREAD_NAME 0x406D1388
-
-namespace talk_base {
-
-ThreadManager g_thmgr;
-
-#ifdef POSIX
-pthread_key_t ThreadManager::key_;
-
-ThreadManager::ThreadManager() {
- pthread_key_create(&key_, NULL);
- main_thread_ = new Thread();
- SetCurrent(main_thread_);
-}
-
-ThreadManager::~ThreadManager() {
- pthread_key_delete(key_);
- delete main_thread_;
-}
-
-Thread *ThreadManager::CurrentThread() {
- return (Thread *)pthread_getspecific(key_);
-}
-
-void ThreadManager::SetCurrent(Thread *thread) {
- pthread_setspecific(key_, thread);
-}
-#endif
-
-#ifdef WIN32
-DWORD ThreadManager::key_;
-
-ThreadManager::ThreadManager() {
- key_ = TlsAlloc();
- main_thread_ = new Thread();
- SetCurrent(main_thread_);
-}
-
-ThreadManager::~ThreadManager() {
- TlsFree(key_);
- delete main_thread_;
-}
-
-Thread *ThreadManager::CurrentThread() {
- return (Thread *)TlsGetValue(key_);
-}
-
-void ThreadManager::SetCurrent(Thread *thread) {
- TlsSetValue(key_, thread);
-}
-#endif
-
-void ThreadManager::Add(Thread *thread) {
- CritScope cs(&crit_);
- threads_.push_back(thread);
-}
-
-void ThreadManager::Remove(Thread *thread) {
- CritScope cs(&crit_);
- threads_.erase(std::remove(threads_.begin(), threads_.end(), thread), threads_.end());
-}
-
-bool ThreadManager::ThreadActive(Thread *thread) {
- CritScope cs(&crit_);
- return(std::find(threads_.begin(), threads_.end(), thread) != threads_.end());
-}
-
-Thread::Thread(SocketServer* ss) : MessageQueue(ss), priority_(PRIORITY_NORMAL) {
- g_thmgr.Add(this);
- started_ = false;
- stopped_ = false;
- has_sends_ = false;
-}
-
-Thread::~Thread() {
- Stop();
- if (active_)
- Clear(NULL);
- g_thmgr.Remove(this);
-}
-
-#ifdef POSIX
-void Thread::Start() {
- pthread_attr_t attr;
- pthread_attr_init(&attr);
- if (priority_ == PRIORITY_IDLE) {
- struct sched_param param;
- pthread_attr_getschedparam(&attr, &param);
- param.sched_priority = 15; // +15 =
- pthread_attr_setschedparam(&attr, &param);
- }
- CritScope cs(&started_crit_);
- // Make sure Join() hasn't been called yet.
- if (stopped_)
- return;
- if (pthread_create(&thread_, &attr, PreRun, this) == 0)
- started_ = true;
-}
-
-void Thread::Join() {
- CritScope cs(&started_crit_);
- stopped_ = true;
- if (started_) {
- void *pv;
- pthread_join(thread_, &pv);
- started_ = false;
- }
-}
-#endif
-
-#ifdef WIN32
-
-typedef struct tagTHREADNAME_INFO
-{
- DWORD dwType;
- LPCSTR szName;
- DWORD dwThreadID;
- DWORD dwFlags;
-} THREADNAME_INFO;
-
-void SetThreadName( DWORD dwThreadID, LPCSTR szThreadName)
-{
- THREADNAME_INFO info;
- {
- info.dwType = 0x1000;
- info.szName = szThreadName;
- info.dwThreadID = dwThreadID;
- info.dwFlags = 0;
- }
- __try
- {
- RaiseException(MSDEV_SET_THREAD_NAME, 0, sizeof(info)/sizeof(DWORD), (DWORD*)&info );
- }
- __except(EXCEPTION_CONTINUE_EXECUTION)
- {
- }
-}
-
-void Thread::Start() {
- DWORD flags = 0;
- if (priority_ != PRIORITY_NORMAL) {
- flags = CREATE_SUSPENDED;
- }
- CritScope cs(&started_crit_);
- // Make sure Join() hasn't been called yet.
- if (stopped_)
- return;
- thread_ = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)PreRun, this, flags, NULL);
- if (thread_) {
- if (priority_ != PRIORITY_NORMAL) {
- if (priority_ == PRIORITY_IDLE) {
- ::SetThreadPriority(thread_, THREAD_PRIORITY_IDLE);
- }
- ::ResumeThread(thread_);
- }
- }
- started_ = true;
-}
-
-void Thread::Join() {
- CritScope cs(&started_crit_);
- stopped_ = true;
- if (started_) {
- WaitForSingleObject(thread_, INFINITE);
- CloseHandle(thread_);
- started_ = false;
- }
-}
-#endif
-
-void *Thread::PreRun(void *pv) {
- Thread *thread = (Thread *)pv;
- // Make sure the thread hasn't been deleted.
- if (!g_thmgr.ThreadActive(thread))
- return NULL;
- ThreadManager::SetCurrent(thread);
-#if defined(WIN32) && defined(_DEBUG)
- char buf[256];
- _snprintf(buf, sizeof(buf), "Thread 0x%.8x", thread);
- SetThreadName(GetCurrentThreadId(), buf);
-#endif
- thread->Run();
- return NULL;
-}
-
-void Thread::Run() {
- ProcessMessages(kForever);
-}
-
-void Thread::Stop() {
- MessageQueue::Quit();
- Join();
-}
-
-void Thread::Send(MessageHandler *phandler, uint32 id, MessageData *pdata) {
- if (fStop_)
- return;
-
- // Sent messages are sent to the MessageHandler directly, in the context
- // of "thread", like Win32 SendMessage. If in the right context,
- // call the handler directly.
-
- Message msg;
- msg.phandler = phandler;
- msg.message_id = id;
- msg.pdata = pdata;
- if (IsCurrent()) {
- phandler->OnMessage(&msg);
- return;
- }
-
- AutoThread thread;
- Thread *current_thread = Thread::Current();
- ASSERT(current_thread != NULL); // AutoThread ensures this
-
- bool ready = false;
- {
- CritScope cs(&crit_);
- EnsureActive();
- _SendMessage smsg;
- smsg.thread = current_thread;
- smsg.msg = msg;
- smsg.ready = &ready;
- sendlist_.push_back(smsg);
- has_sends_ = true;
- }
-
- // Wait for a reply
-
- ss_->WakeUp();
-
- bool waited = false;
- while (!ready) {
- current_thread->ReceiveSends();
- current_thread->socketserver()->Wait(kForever, false);
- waited = true;
- }
-
- // Our Wait loop above may have consumed some WakeUp events for this
- // MessageQueue, that weren't relevant to this Send. Losing these WakeUps can
- // cause problems for some SocketServers.
- //
- // Concrete example:
- // Win32SocketServer on thread A calls Send on thread B. While processing the
- // message, thread B Posts a message to A. We consume the wakeup for that
- // Post while waiting for the Send to complete, which means that when we exit
- // this loop, we need to issue another WakeUp, or else the Posted message
- // won't be processed in a timely manner.
-
- if (waited) {
- current_thread->socketserver()->WakeUp();
- }
-}
-
-void Thread::ReceiveSends() {
- // Before entering critical section, check boolean.
-
- if (!has_sends_)
- return;
-
- // Receive a sent message. Cleanup scenarios:
- // - thread sending exits: We don't allow this, since thread can exit
- // only via Join, so Send must complete.
- // - thread receiving exits: Wakeup/set ready in Thread::Clear()
- // - object target cleared: Wakeup/set ready in Thread::Clear()
- crit_.Enter();
- while (!sendlist_.empty()) {
- _SendMessage smsg = sendlist_.front();
- sendlist_.pop_front();
- crit_.Leave();
- smsg.msg.phandler->OnMessage(&smsg.msg);
- crit_.Enter();
- *smsg.ready = true;
- smsg.thread->socketserver()->WakeUp();
- }
- has_sends_ = false;
- crit_.Leave();
-}
-
-void Thread::Clear(MessageHandler *phandler, uint32 id) {
- CritScope cs(&crit_);
-
- // Remove messages on sendlist_ with phandler
- // Object target cleared: remove from send list, wakeup/set ready
- // if sender not NULL.
-
- std::list<_SendMessage>::iterator iter = sendlist_.begin();
- while (iter != sendlist_.end()) {
- _SendMessage smsg = *iter;
- if (phandler == NULL || smsg.msg.phandler == phandler) {
- if (id == (uint32)-1 || smsg.msg.message_id == id) {
- iter = sendlist_.erase(iter);
- *smsg.ready = true;
- smsg.thread->socketserver()->WakeUp();
- continue;
- }
- }
- ++iter;
- }
-
- MessageQueue::Clear(phandler, id);
-}
-
-bool Thread::ProcessMessages(int cmsLoop) {
- uint32 msEnd;
- if (cmsLoop != kForever)
- msEnd = GetMillisecondCount() + cmsLoop;
- int cmsNext = cmsLoop;
-
- while (true) {
- Message msg;
- if (!Get(&msg, cmsNext))
- return !IsQuitting();
- Dispatch(&msg);
-
- if (cmsLoop != kForever) {
- uint32 msCur = GetMillisecondCount();
- if (msCur >= msEnd)
- return true;
- cmsNext = msEnd - msCur;
- }
- }
-}
-
-AutoThread::AutoThread(SocketServer* ss) : Thread(ss) {
- if (!ThreadManager::CurrentThread()) {
- ThreadManager::SetCurrent(this);
- }
-}
-
-AutoThread::~AutoThread() {
- if (ThreadManager::CurrentThread() == this) {
- ThreadManager::SetCurrent(NULL);
- }
-}
-
-} // namespace talk_base
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