//可以用来解决同一线程需要多次获取互斥量时死锁的问题classrecursive_mutex {public: recursive_mutex(constrecursive_mutex&) =delete; recursive_mutex&operator=(constrecursive_mutex&) =delete; recursive_mutex() noexcept;~recursive_mutex();voidlock();voidunlock();//释放互斥量时需要调用与该锁层次深度相同...
wait(uni_m, [=] { return flag != 1; }); cout << "Thread ID: " << std::this_thread::get_id() << endl; return; } int main() { std::mutex cv_mutex; std::condition_variable cv; int flag = 0; std::thread t1(&PrintID_CV, ref(cv_mutex), ref(cv), flag); while (...
(const mutex&) = delete; mutex& operator=(const mutex&) = delete; void lock() { int __e = __gthread_mutex_lock(&_M_mutex); // EINVAL, EAGAIN, EBUSY, EINVAL, EDEADLK(may) if (__e) __throw_system_error(__e); } bool try_lock() noexcept { // XXX EINVAL, EAGAIN, EBUSY...
std::lock_guard 类模板是对 std::mutex 的 RAII 封装,用于防止忘记解锁以及出现异常时不能被解锁,保证一定程度的线程安全 mutable std::mutex m; 的作用是在声明为 const 的函数里对 std::mutex 进行修改,通过 std::lock_guard,因为只想保护内部数据,而不是保护互斥器不被修改 这个类中大部分成员函数的第...
#include <iostream>#include <string>#include <thread>#include <mutex>#include <condition_variable> std::mutex m;std::condition_variable cv;std::string data;bool ready = false;bool processed = false; voi
unique_lock<std::mutex>lk(m_a); 对象在超出作用域时,会调用析构函数,析构函数会将对象持有的互斥锁解锁,所以即使不主动解锁,超出作用域后 lk(m_a)也会被析构函数解锁。 下面是VS2019中mutex头文件中对~unique_lock()的定义 private: _Mutex* _Pmtx; ...
switch(opn_type) { case 1: { std::unique_lock<std::mutex> ul(m); // do processing and add to queue cv.notify_one(); ul.unlock(); } break; default: break; } 大小...
std::mutex::try_lock booltry_lock(); (since C++11) Tries to lock the mutex. Returns immediately. On successful lock acquisition returnstrue, otherwise returnsfalse. This function is allowed to fail spuriously and returnfalseeven if the mutex is not currently locked by any other thread. ...
1>C:\Program Files (x86)\IntelSWTools\openvino\deployment_tools\ngraph\include\ngraph\factory.hpp(27,21): error C2039: 'mutex': is not a member of 'std'1>C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Tools\MSVC\14.27.29110\include\stack(20): message : ...
根据C++规范,std::recursive_mutex支持在同一thread内递归加锁,而std::mutex不支持。 下面这代码,在VS2017中运行出错,emmm……。 #include<iostream>#include<mutex>std::mutex m;intmain(intargc,char**argv){std::lock_guard<std::mutex>ll(m);std::cout<<"111111111111"<<std::endl;std::lock_guard<...