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#pragma once
/*
* Copyright (C) 2016 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.
*/
#if defined(_WIN32)
#include <windows.h>
#include <android-base/macros.h>
#include "adb.h"
// The prebuilt version of mingw we use doesn't support mutex or recursive_mutex.
// Therefore, implement our own using the Windows primitives.
// Put them directly into the std namespace, so that when they're actually available, the build
// breaks until they're removed.
#include <mutex>
namespace std {
// CRITICAL_SECTION is recursive, so just wrap it in a Mutex-compatible class.
class recursive_mutex {
public:
recursive_mutex() {
InitializeCriticalSection(&mutex_);
}
~recursive_mutex() {
DeleteCriticalSection(&mutex_);
}
void lock() {
EnterCriticalSection(&mutex_);
}
bool try_lock() {
return TryEnterCriticalSection(&mutex_);
}
void unlock() {
LeaveCriticalSection(&mutex_);
}
private:
CRITICAL_SECTION mutex_;
DISALLOW_COPY_AND_ASSIGN(recursive_mutex);
};
class mutex {
public:
mutex() {
}
~mutex() {
}
void lock() {
mutex_.lock();
if (++lock_count_ != 1) {
fatal("non-recursive mutex locked reentrantly");
}
}
void unlock() {
if (--lock_count_ != 0) {
fatal("non-recursive mutex unlock resulted in unexpected lock count: %d", lock_count_);
}
mutex_.unlock();
}
bool try_lock() {
if (!mutex_.try_lock()) {
return false;
}
if (lock_count_ != 0) {
mutex_.unlock();
return false;
}
++lock_count_;
return true;
}
private:
recursive_mutex mutex_;
size_t lock_count_ = 0;
};
}
#elif defined(__BIONIC__)
// On M, the recovery image uses parts of adb that depends on recursive_mutex, and uses libstdc++,
// which lacks it.
#include <pthread.h>
#include <mutex>
#include <base/macros.h>
class recursive_mutex {
public:
recursive_mutex() {
}
~recursive_mutex() {
}
void lock() {
pthread_mutex_lock(&mutex_);
}
bool try_lock() {
return pthread_mutex_trylock(&mutex_);
}
void unlock() {
pthread_mutex_unlock(&mutex_);
}
private:
pthread_mutex_t mutex_ = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
DISALLOW_COPY_AND_ASSIGN(recursive_mutex);
};
#endif
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