mirror of
https://github.com/Tencent/MMKV.git
synced 2026-10-17 04:30:56 +08:00
guoling
123 lines
3.4 KiB
C++
123 lines
3.4 KiB
C++
/*
|
|
* Tencent is pleased to support the open source community by making
|
|
* MMKV available.
|
|
*
|
|
* Copyright (C) 2018 THL A29 Limited, a Tencent company.
|
|
* All rights reserved.
|
|
*
|
|
* Licensed under the BSD 3-Clause License (the "License"); you may not use
|
|
* this file except in compliance with the License. You may obtain a copy of
|
|
* the License at
|
|
*
|
|
* https://opensource.org/licenses/BSD-3-Clause
|
|
*
|
|
* 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 "ThreadLock.h"
|
|
#include "MMKVLog.h"
|
|
#include <atomic>
|
|
|
|
using namespace std;
|
|
|
|
namespace mmkv {
|
|
|
|
ThreadLock::ThreadLock() {
|
|
pthread_mutexattr_t attr;
|
|
pthread_mutexattr_init(&attr);
|
|
pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
|
|
|
|
pthread_mutex_init(&m_lock, &attr);
|
|
|
|
pthread_mutexattr_destroy(&attr);
|
|
}
|
|
|
|
ThreadLock::~ThreadLock() {
|
|
pthread_mutex_destroy(&m_lock);
|
|
}
|
|
|
|
void ThreadLock::lock() {
|
|
auto ret = pthread_mutex_lock(&m_lock);
|
|
if (ret != 0) {
|
|
MMKVError("fail to lock %p, ret=%d, errno=%s", &m_lock, ret, strerror(errno));
|
|
}
|
|
}
|
|
|
|
bool ThreadLock::try_lock() {
|
|
auto ret = pthread_mutex_trylock(&m_lock);
|
|
if (ret != 0) {
|
|
MMKVError("fail to try lock %p, ret=%d, errno=%s", &m_lock, ret, strerror(errno));
|
|
}
|
|
return (ret == 0);
|
|
}
|
|
|
|
void ThreadLock::unlock() {
|
|
auto ret = pthread_mutex_unlock(&m_lock);
|
|
if (ret != 0) {
|
|
MMKVError("fail to unlock %p, ret=%d, errno=%s", &m_lock, ret, strerror(errno));
|
|
}
|
|
}
|
|
|
|
#if MMKV_USING_PTHREAD
|
|
void ThreadLock::ThreadOnce(ThreadOnceToken *onceToken, void (*callback)()) {
|
|
pthread_once(onceToken, callback);
|
|
}
|
|
# ifndef NDEBUG
|
|
static uint64_t gettid() {
|
|
uint64_t tid = 0;
|
|
pthread_threadid_np(nullptr, &tid);
|
|
return tid;
|
|
}
|
|
# endif
|
|
#else
|
|
void ThreadLock::ThreadOnce(ThreadOnceToken *onceToken, void (*callback)()) {
|
|
if (!onceToken || !callback) {
|
|
assert(onceToken);
|
|
assert(callback);
|
|
return;
|
|
}
|
|
while (true) {
|
|
auto expected = ThreadOnceUninitialized;
|
|
atomic_compare_exchange_weak(onceToken, &expected, ThreadOnceInitializing);
|
|
switch (expected) {
|
|
case ThreadOnceInitialized:
|
|
return;
|
|
case ThreadOnceUninitialized:
|
|
callback();
|
|
onceToken->store(ThreadOnceInitialized);
|
|
return;
|
|
case ThreadOnceInitializing: {
|
|
// another thread is initializing, let's wait for 1ms
|
|
Sleep(1);
|
|
break;
|
|
}
|
|
default: {
|
|
MMKVError("should never happen:%d", expected);
|
|
assert(0);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void ThreadLock::Sleep(int ms) {
|
|
constexpr auto MILLI_SECOND_MULTIPLIER = 1000;
|
|
constexpr auto NANO_SECOND_MULTIPLIER = MILLI_SECOND_MULTIPLIER * MILLI_SECOND_MULTIPLIER;
|
|
timespec duration = {0};
|
|
if (ms > 999) {
|
|
duration.tv_sec = ms / MILLI_SECOND_MULTIPLIER;
|
|
duration.tv_nsec = (ms % MILLI_SECOND_MULTIPLIER) * NANO_SECOND_MULTIPLIER;
|
|
} else {
|
|
duration.tv_nsec = ms * NANO_SECOND_MULTIPLIER;
|
|
}
|
|
nanosleep(&duration, nullptr);
|
|
}
|
|
|
|
#endif
|
|
|
|
} // namespace mmkv
|