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// Copyright 2016 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/spin_lock.h"
#include "starboard/thread.h"
namespace starboard {
void SpinLockAcquire(SbAtomic32* atomic) {
while (SbAtomicAcquire_CompareAndSwap(atomic, kSpinLockStateReleased,
kSpinLockStateAcquired) ==
kSpinLockStateAcquired) {
SbThreadYield();
}
}
void SpinLockRelease(SbAtomic32* atomic) {
SbAtomicRelease_Store(atomic, kSpinLockStateReleased);
}
SpinLock::SpinLock() : atomic_(kSpinLockStateReleased) {}
SpinLock::~SpinLock() {}
void SpinLock::Acquire() {
SpinLockAcquire(&atomic_);
}
void SpinLock::Release() {
SpinLockRelease(&atomic_);
}
ScopedSpinLock::ScopedSpinLock(SbAtomic32* atomic) : atomic_(atomic) {
SpinLockAcquire(atomic_);
}
ScopedSpinLock::ScopedSpinLock(SpinLock& spin_lock)
: atomic_(&spin_lock.atomic_) {
SpinLockAcquire(atomic_);
}
ScopedSpinLock::~ScopedSpinLock() {
SpinLockRelease(atomic_);
}
} // namespace starboard