mirror of
https://github.com/Tencent/MMKV.git
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guoling
138 lines
3.6 KiB
C++
138 lines
3.6 KiB
C++
/*
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* Tencent is pleased to support the open source community by making
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* MMKV available.
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*
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* Copyright (C) 2018 THL A29 Limited, a Tencent company.
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* All rights reserved.
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*
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* Licensed under the BSD 3-Clause License (the "License"); you may not use
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* this file except in compliance with the License. You may obtain a copy of
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* the License at
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*
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* https://opensource.org/licenses/BSD-3-Clause
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "ThreadLock.h"
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#include "MMKVLog.h"
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#include <atomic>
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#ifdef MMKV_LINUX
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# include <sys/syscall.h>
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# include <unistd.h>
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static pid_t gettid() {
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return syscall(SYS_gettid);
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}
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#endif
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using namespace std;
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namespace mmkv {
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ThreadLock::ThreadLock() {
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pthread_mutexattr_t attr;
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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pthread_mutex_init(&m_lock, &attr);
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pthread_mutexattr_destroy(&attr);
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}
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ThreadLock::~ThreadLock() {
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pthread_mutex_destroy(&m_lock);
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}
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void ThreadLock::lock() {
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auto ret = pthread_mutex_lock(&m_lock);
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if (ret != 0) {
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MMKVError("fail to lock %p, ret=%d, errno=%s", &m_lock, ret, strerror(errno));
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}
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}
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bool ThreadLock::try_lock() {
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auto ret = pthread_mutex_trylock(&m_lock);
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if (ret != 0) {
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MMKVError("fail to try lock %p, ret=%d, errno=%s", &m_lock, ret, strerror(errno));
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}
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return (ret == 0);
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}
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void ThreadLock::unlock() {
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auto ret = pthread_mutex_unlock(&m_lock);
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if (ret != 0) {
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MMKVError("fail to unlock %p, ret=%d, errno=%s", &m_lock, ret, strerror(errno));
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}
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}
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#if MMKV_USING_PTHREAD
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void ThreadLock::ThreadOnce(ThreadOnceToken *onceToken, void (*callback)()) {
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pthread_once(onceToken, callback);
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}
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# ifndef NDEBUG
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static uint64_t gettid() {
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# ifdef MMKV_MAC
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uint64_t tid = 0;
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pthread_threadid_np(nullptr, &tid);
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return tid;
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# elif MMKV_LINUX
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return ::gettid();
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# else
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assert(0);
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return 0;
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# endif
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}
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# endif
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#else
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void ThreadLock::ThreadOnce(ThreadOnceToken *onceToken, void (*callback)()) {
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if (!onceToken || !callback) {
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assert(onceToken);
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assert(callback);
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return;
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}
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while (true) {
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auto expected = ThreadOnceUninitialized;
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atomic_compare_exchange_weak(onceToken, &expected, ThreadOnceInitializing);
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switch (expected) {
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case ThreadOnceInitialized:
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return;
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case ThreadOnceUninitialized:
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callback();
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onceToken->store(ThreadOnceInitialized);
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return;
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case ThreadOnceInitializing: {
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// another thread is initializing, let's wait for 1ms
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Sleep(1);
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break;
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}
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default: {
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MMKVError("should never happen:%d", expected);
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assert(0);
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return;
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}
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}
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}
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}
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void ThreadLock::Sleep(int ms) {
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constexpr auto MILLI_SECOND_MULTIPLIER = 1000;
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constexpr auto NANO_SECOND_MULTIPLIER = MILLI_SECOND_MULTIPLIER * MILLI_SECOND_MULTIPLIER;
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timespec duration = {0};
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if (ms > 999) {
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duration.tv_sec = ms / MILLI_SECOND_MULTIPLIER;
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duration.tv_nsec = (ms % MILLI_SECOND_MULTIPLIER) * NANO_SECOND_MULTIPLIER;
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} else {
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duration.tv_nsec = ms * NANO_SECOND_MULTIPLIER;
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}
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nanosleep(&duration, nullptr);
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}
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#endif
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} // namespace mmkv
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