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// Copyright 2008, Google Inc.
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 COPYRIGHT
// OWNER OR CONTRIBUTORS 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.
#include "base/thread.h"
#include "base/message_loop.h"
#include "base/ref_counted.h"
#include "base/string_util.h"
// This task is used to trigger the message loop to exit.
class ThreadQuitTask : public Task {
public:
virtual void Run() {
MessageLoop::current()->Quit();
#ifndef NDEBUG
Thread::SetThreadWasQuitProperly(true);
#endif
}
};
Thread::Thread(const char *name)
: thread_id_(0),
message_loop_(NULL),
name_(name) {
}
Thread::~Thread() {
Stop();
}
void* ThreadFunc(void* closure) {
// TODO(pinkerton): I have no clue what to do here
pthread_exit(NULL);
}
// We use this thread-local variable to record whether or not a thread exited
// because its Stop method was called. This allows us to catch cases where
// MessageLoop::Quit() is called directly, which is unexpected when using a
// Thread to setup and run a MessageLoop.
// Note that if we start doing complex stuff in other static initializers
// this could cause problems.
// TODO(evanm): don't rely on static initialization.
TLSSlot Thread::tls_index_;
void Thread::SetThreadWasQuitProperly(bool flag) {
tls_index_.Set(reinterpret_cast<void*>(flag));
}
bool Thread::GetThreadWasQuitProperly() {
return (tls_index_.Get() != 0);
}
bool Thread::Start() {
return StartWithStackSize(0);
}
bool Thread::StartWithStackSize(size_t stack_size) {
bool success = false;
pthread_attr_t attributes;
pthread_attr_init(&attributes);
// A stack size smaller than PTHREAD_STACK_MIN won't change the default value.
pthread_attr_setstacksize(&attributes, stack_size);
int result = pthread_create(&thread_id_,
&attributes,
ThreadFunc,
&message_loop_);
if (!result)
success = true;
pthread_attr_destroy(&attributes);
return success;
}
void Thread::Stop() {
// DCHECK_NE(thread_id_, GetCurrentThreadId())
// << "Can't call Stop() on itself";
// We had better have a message loop at this point! If we do not, then it
// most likely means that the thread terminated unexpectedly, probably due
// to someone calling Quit() on our message loop directly.
DCHECK(message_loop_);
message_loop_->PostTask(FROM_HERE, new ThreadQuitTask());
message_loop_ = NULL;
}
void Thread::StopSoon() {
// TODO(paulg): Make Thread::Stop block on thread join, and Thread::StopSoon
// return immediately after calling (like the Windows versions).
Stop();
}
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