blob: 7b44bd0d42ebc7dbe684f79be19791f1b9f87dbd [file] [log] [blame]
// Copyright 2018 The Cobalt Authors. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "starboard/common/recursive_mutex.h"
#include "starboard/common/log.h"
namespace starboard {
RecursiveMutex::RecursiveMutex()
: owner_id_(kSbThreadInvalidId), recurse_count_(0) {}
RecursiveMutex::~RecursiveMutex() {}
void RecursiveMutex::Acquire() {
SbThreadId current_thread = SbThreadGetId();
if (owner_id_ == current_thread) {
recurse_count_++;
SB_DCHECK(recurse_count_ > 0);
return;
}
mutex_.Acquire();
owner_id_ = current_thread;
recurse_count_ = 1;
}
void RecursiveMutex::Release() {
SB_DCHECK(owner_id_ == SbThreadGetId());
if (owner_id_ == SbThreadGetId()) {
SB_DCHECK(0 < recurse_count_);
recurse_count_--;
if (recurse_count_ == 0) {
owner_id_ = kSbThreadInvalidId;
mutex_.Release();
}
}
}
bool RecursiveMutex::AcquireTry() {
SbThreadId current_thread = SbThreadGetId();
if (owner_id_ == current_thread) {
recurse_count_++;
SB_DCHECK(recurse_count_ > 0);
return true;
}
if (!mutex_.AcquireTry()) {
return false;
}
owner_id_ = current_thread;
recurse_count_ = 1;
return true;
}
ScopedRecursiveLock::ScopedRecursiveLock(RecursiveMutex& mutex)
: mutex_(mutex) {
mutex_.Acquire();
}
ScopedRecursiveLock::~ScopedRecursiveLock() {
mutex_.Release();
}
} // namespace starboard.