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/*
* Copyright (C) 2014 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 "monitor_pool.h"
#include "base/logging.h"
#include "base/mutex-inl.h"
#include "thread-inl.h"
#include "monitor.h"
namespace art {
MonitorPool::MonitorPool() : allocated_ids_lock_("allocated monitor ids lock",
LockLevel::kMonitorPoolLock) {
}
Monitor* MonitorPool::LookupMonitorFromTable(MonitorId mon_id) {
ReaderMutexLock mu(Thread::Current(), allocated_ids_lock_);
return table_.Get(mon_id);
}
MonitorId MonitorPool::AllocMonitorIdFromTable(Thread* self, Monitor* mon) {
WriterMutexLock mu(self, allocated_ids_lock_);
for (size_t i = 0; i < allocated_ids_.size(); ++i) {
if (!allocated_ids_[i]) {
allocated_ids_.set(i);
MonitorId mon_id = i + 1; // Zero is reserved to mean "invalid".
table_.Put(mon_id, mon);
return mon_id;
}
}
LOG(FATAL) << "Out of internal monitor ids";
return 0;
}
void MonitorPool::ReleaseMonitorIdFromTable(MonitorId mon_id) {
WriterMutexLock mu(Thread::Current(), allocated_ids_lock_);
DCHECK(table_.Get(mon_id) != nullptr);
table_.erase(mon_id);
--mon_id; // Zero is reserved to mean "invalid".
DCHECK(allocated_ids_[mon_id]) << mon_id;
allocated_ids_.reset(mon_id);
}
} // namespace art
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