2 * Copyright (C) 2014 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #include "monitor_pool.h"
19 #include "base/logging.h"
20 #include "base/mutex-inl.h"
21 #include "thread-inl.h"
26 MonitorPool::MonitorPool() : allocated_ids_lock_("allocated monitor ids lock",
27 LockLevel::kMonitorPoolLock) {
30 Monitor* MonitorPool::LookupMonitorFromTable(MonitorId mon_id) {
31 ReaderMutexLock mu(Thread::Current(), allocated_ids_lock_);
32 return table_.Get(mon_id);
35 MonitorId MonitorPool::AllocMonitorIdFromTable(Thread* self, Monitor* mon) {
36 WriterMutexLock mu(self, allocated_ids_lock_);
37 for (size_t i = 0; i < allocated_ids_.size(); ++i) {
38 if (!allocated_ids_[i]) {
39 allocated_ids_.set(i);
40 MonitorId mon_id = i + 1; // Zero is reserved to mean "invalid".
41 table_.Put(mon_id, mon);
45 LOG(FATAL) << "Out of internal monitor ids";
49 void MonitorPool::ReleaseMonitorIdFromTable(MonitorId mon_id) {
50 WriterMutexLock mu(Thread::Current(), allocated_ids_lock_);
51 DCHECK(table_.Get(mon_id) != nullptr);
53 --mon_id; // Zero is reserved to mean "invalid".
54 DCHECK(allocated_ids_[mon_id]) << mon_id;
55 allocated_ids_.reset(mon_id);