lock()。2) 获得互斥体 m 的所有权而不试图锁定它。若当前线程不在 m 上保有非共享锁(即由 lock、try_lock、try_lock_for 或try_lock_until 取得的锁)则行为未定义。3) 复制构造函数被弃置。若m 先于lock_guard 对象被销毁,则行为未定义。 参数m - 要获得所有权的共享互斥体 t - 用于选择构造
std::lock_guard Member functions lock_guard::lock_guard lock_guard::~lock_guard~lock_guard(); (since C++11) Releases the ownership of the owned mutex. Effectively calls m.unlock() where m is the mutex passed to the lock_guard's constructor. ...
})); auto lck = std::lock_guard(foo.mtx); std::lock_guard lck2(foo.mtx, ul); 类模板的模板实参推导在声明和显式转型表达式中发生;细节见类模板实参推导。 (C++17 起)从函数调用推导模板实参推导试图确定模板实参(类型模板形参 Ti 的类型,模板模板形参 TTi 的模板,和常量模板形参 Ii 的值),它们...
std::lock_guard<Mutex>unique_lock<Mutex>std::adopt_lockstd::try_to_lockstd::defer_lockstd::unique_lock<Mutex>::releasestd::call_oncestd::condition_variable创建条件变量等待条件变量被通知std::condition_variable::notify_onestd::condition_variable::notify_all获取线程的运行结果创建异步任务获取异步...
lock()is usually not called directly:std::unique_lock,std::scoped_lock, andstd::lock_guardare used to manage exclusive locking. Shared mutexes do not support direct transition from shared to unique ownership mode: the shared lock has to be relinquished withunlock_shared()before exclusive ownersh...
(de.m,std::defer_lock);std::unique_lock<std::mutex>lock2(a.m,std::defer_lock);// bloquear ambos unique_locks sin interbloqueostd::lock(lock1, lock2);de.num_cosas-=num;a.num_cosas+=num;// los mutex 'de.m' y 'a.m' se han desbloqueado en los dtores de 'unique_lock'}int...
std::mutex m; std::lock_guard<std::mutex> lock(m); 额外参数:std::adopt_lock:只需解锁,无需上锁 // 手动上锁 m.lock(); std::lock_guard<mutex> lock(m, std::adopt_lock); unique_lock<Mutex> 构造上锁,析构解锁 std::mutex m; std::unique_lock<mutex> lock(m); std::adopt_lock 只...
#include <mutex> std::mutex mtx; void threadFunction() { std::lock_guard<std::mutex> lock(mtx); std::cout << "Thread safe output." << std::endl; } int main() { std::thread t1(threadFunction); std::thread t2(threadFunction); t1.join(); t2.join(); return 0; } 使用std...
#include <mutex> std::mutex mtx; void threadFunction() { std::lock_guard<std::mutex> lock(mtx); std::cout << "Thread safe output." << std::endl; } int main() { std::thread t1(threadFunction); std::thread t2(threadFunction); t1.join(); t2.join(); return 0; } 使用...
std::unique_lock<std::mutex> lock; extern bool predicate(); // 调用方式 1 cond.wait(lock); // 调用方式 2 cond.wait(lock, predicate); wait不断地尝试重新获取并加锁该互斥量,如果获取不到,它就卡在这里并反复尝试重新获取,如果获取到了,执行流程就继续往下走 wait在获取到互斥量并加锁了互斥量...