starboard/shared/pthread/mutex_acquire_try.cc

// Copyright 2015 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/mutex.h"

#include <pthread.h>

#include "starboard/shared/pthread/is_success.h"
#include "starboard/shared/pthread/types_internal.h"
#include "starboard/shared/starboard/lazy_initialization_internal.h"

using starboard::shared::starboard::EnsureInitialized;
using starboard::shared::starboard::SetInitialized;

SbMutexResult SbMutexAcquireTry(SbMutex* mutex) {
  if (!mutex) {
    return kSbMutexDestroyed;
  }

  if (!EnsureInitialized(&(SB_INTERNAL_MUTEX(mutex)->initialized_state))) {
    *SB_PTHREAD_INTERNAL_MUTEX(mutex) = PTHREAD_MUTEX_INITIALIZER;
    SetInitialized(&(SB_INTERNAL_MUTEX(mutex)->initialized_state));
  }

  int result = pthread_mutex_trylock(SB_PTHREAD_INTERNAL_MUTEX(mutex));
  if (IsSuccess(result)) {
    return kSbMutexAcquired;
  }

  return kSbMutexBusy;
}