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// Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/thread_collision_warner.h"
#include "base/atomicops.h"
#include "base/logging.h"
namespace base {
void DCheckAsserter::warn() {
NOTREACHED() << "Thread Collision";
}
void ThreadCollisionWarner::EnterSelf() {
// If the active thread is 0 then I'll write the current thread ID
// if two or more threads arrive here only one will succeed to
// write on valid_thread_id_ the current thread ID.
const int current_thread_id = PlatformThread::CurrentId();
int previous_value = subtle::NoBarrier_CompareAndSwap(&valid_thread_id_,
0,
current_thread_id);
if (previous_value != 0 && previous_value != current_thread_id) {
// gotcha! a thread is trying to use the same class and that is
// not current thread.
asserter_->warn();
}
subtle::NoBarrier_AtomicIncrement(&counter_, 1);
}
void ThreadCollisionWarner::Enter() {
const int current_thread_id = PlatformThread::CurrentId();
if (subtle::NoBarrier_CompareAndSwap(&valid_thread_id_,
0,
current_thread_id) != 0) {
// gotcha! another thread is trying to use the same class.
asserter_->warn();
}
subtle::NoBarrier_AtomicIncrement(&counter_, 1);
}
void ThreadCollisionWarner::Leave() {
if (subtle::Barrier_AtomicIncrement(&counter_, -1) == 0) {
subtle::NoBarrier_Store(&valid_thread_id_, 0);
}
}
} // namespace base
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