diff options
Diffstat (limited to 'runtime/barrier.cc')
-rw-r--r-- | runtime/barrier.cc | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/runtime/barrier.cc b/runtime/barrier.cc new file mode 100644 index 0000000..250d468 --- /dev/null +++ b/runtime/barrier.cc @@ -0,0 +1,63 @@ +/* + * Copyright (C) 2012 The Android Open Source Project + * + * 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 "barrier.h" + +#include "base/mutex.h" +#include "thread.h" + +namespace art { + +Barrier::Barrier(int count) + : count_(count), + lock_("GC barrier lock"), + condition_("GC barrier condition", lock_) { +} + +void Barrier::Pass(Thread* self) { + MutexLock mu(self, lock_); + SetCountLocked(self, count_ - 1); +} + +void Barrier::Wait(Thread* self) { + Increment(self, -1); +} + +void Barrier::Init(Thread* self, int count) { + MutexLock mu(self, lock_); + SetCountLocked(self, count); +} + +void Barrier::Increment(Thread* self, int delta) { + MutexLock mu(self, lock_); + SetCountLocked(self, count_ + delta); + if (count_ != 0) { + condition_.Wait(self); + } +} + +void Barrier::SetCountLocked(Thread* self, int count) { + count_ = count; + if (count_ == 0) { + condition_.Broadcast(self); + } +} + +Barrier::~Barrier() { + CHECK(!count_) << "Attempted to destroy barrier with non zero count"; +} + +} |