本文将介绍 C++ 中常用的锁,包括 std::mutex、std::unique_lock、std::shared_mutex、std::timed_mutex、std::recursive_mutex 和std::lock_guard,并通过示例说明每种锁的原理、使用方式及其适用场景。 1. std::mutex(互斥锁) 原理 std::mutex 是最基本的互斥
std::shared_lock std::lock_guard std::hardware_destructive_interference_size, std::hardware_constructive_interference_size std::counting_semaphore, std::binary_semaphore std::jthread cpp/thread/barrier std::future std::this_thread::yield std::this_thread::sleep_for std::this_thread::sleep_until...
c++11中使用了std::lock_guard互斥锁(#include <thread>)。我们看看#include <pthread.h>中使用方法。 操作函数 pthread_mutex_t lock; /* 互斥锁定义 */ pthread_mutex_init(&lock, NULL); /* 动态初始化, 成功返回0,失败返回非0 */ pthread_mutex_t thread_mutex = PTHREAD_MUTEX_INITIALIZER; /* 静...
std::size_t value = counter.Get(); std::lock_guard<std::mutex> lock(g_io_mutex); std::cout << std::this_thread::get_id() << ' ' << value << std::endl; } } int main() { const std::size_t SIZE = 2; Counter counter; std::vector<std::thread> v; v.reserve(SIZE);...
std::lock_guard<std::mutex> lock(g_workReadyMutex); g_workReady = true; } g_workReadyConditionVariable.notify_one(); // (std::condition_variable) break; } } 然后,在后台线程上,可以侦听此条件变量以唤醒和调用 XTaskQueueDispatch。
C11以及C++11以后,都开始支持原子类型、原子操作以及内存屏障,下面以C++为例,说明C++11在lock-free方面的支持。 3.1 原子类型及操作 std::atomic <type> var_name; type: the type of variable that can be of any primitive data type such as int, bool, char, etc. 目前标准库默认用typedef定义了很多整...
P0152R1 atomic::is_always_lock_free VS 2017 15.3 17 P0154R1 hardware_destructive_interference_size, etc. VS 2017 15.3 17 P0156R0 Variadic lock_guard VS 2015.2 14 P0156R2 Renaming Variadic lock_guard to scoped_lock VS 2017 15.3 17 P0163R0 shared_ptr::weak_type VS 201...
If multiple files are specified, each is processed to produce an object file and then all the object files are presented to the linker. You can stop this sequence at various points using appropriate compiler switches, or by selecting options with the VisualDSP++ IDDE. These switches are -E,...
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void static_mutex::lock() { #ifdef __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION static __gthread_once_t once = __GTHREAD_ONCE_INIT; __gthread_once (&once, init); #endif __gthread_recursive_mutex_lock (&mutex); } void static_mutex::unlock () { __gthread_recursive_mutex_unlock (&mutex)...