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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());
+}
+
+Thread::Thread(SocketServer* ss) : MessageQueue(ss), priority_(PRIORITY_NORMAL) {
+ g_thmgr.Add(this);
+ started_ = 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);
+ }
+ pthread_create(&thread_, &attr, PreRun, this);
+ started_ = true;
+}
+
+void Thread::Join() {
+ if (started_) {
+ void *pv;
+ pthread_join(thread_, &pv);
+ }
+}
+#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;
+ }
+ 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() {
+ if (started_) {
+ WaitForSingleObject(thread_, INFINITE);
+ CloseHandle(thread_);
+ started_ = false;
+ }
+}
+#endif
+
+void *Thread::PreRun(void *pv) {
+ Thread *thread = (Thread *)pv;
+ 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::Stop();
+ 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 false;
+ 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