解决方法是,将锁拿到if外面。 voidshared_print(stringid,intvalue){std::unique_lock<mutex>locker2(_mu_open);if(!_f.is_open()){_f.open("log.txt");}std::unique_lock<mutex>locker(_mu,std::deter::defer_lock);_f<<id<<": "<<value<<endl;// ...locker.lock();} 但是这样又有了新...
std::unique_lock<std::mutex> locker(_mu, std::defer_lock); // ... do something else does not access the ofstream locker.lock(); cout << "From " << id << ": " << value << std::endl; locker.unlock(); // ...do something else. locker.lock(); // 可以lock 和unlock 任意...
#include<iostream>#include<deque>#include<thread>#include<mutex>#include<condition_variable>#include<unistd.h>std::deque<int>q;std::mutex mu;std::condition_variable cond;voidfun1(){while(true){std::unique_lock<std::mutex>locker(mu);q.push_front(count);locker.unlock();cond.notify_one();...
std::unique_lock<std::mutex> locker(m_mutex1,std::defer_lock);//第二个参数说明这个锁的状态,默认是锁定的(即只有一个参数的时候是默认锁定的)locker.lock()lock.unlock() 二、unick_lock应用 voidshared_print(stringmsg,intid) { std::unique_lock<std::mutex>guard(_mu, std::defer_lock);//d...
允许⼿动多次 unlock/lock性能消耗⼤ void foo() { unique_lock<mutex> locker(mtx,defer_lock); defer_lock假定还没有上锁 // do something not using mtx mtx.lock();// do something using mtx to protect mtx.unlock();// do something else } Lazy Initialization #include <iostream> ...
(mtx1,defer_lock) unique_lock lock2(mtx2,defer_lock) lock(lock1,lock2) unique_lock VS lock_guard lock_guard 不允许手动unlock/lock 性能消耗小 unique_lock更加灵活, 允许手动多次 unlock/lock 性能消耗大 void foo() { unique_lock<mutex> locker(mtx,defer_lock); defer_lock假定还没有上锁 //...
// helper for releasing connection and placing it in poolinlinevoidpushConnection(std::unique_lock<std::mutex> &locker, ConPool &pool, redisConnection* con ){ pool.second.push(con); locker.unlock();// notify other threads for their wake up in case of they are waiting// about empty conn...
上C++17..。同时，不需要类型擦除。模板函数参数推导为我们提供了一个简单的助手：
i cannot manage the paramters of contextGen like the ((scheme)) type, and ((t_bits)).. Also i cannot enter ((p value)) with 13 Digit Number the maximum is 9 digit number.. it gives me an error from 10 digits and up, is that normal? or this is a package problem? How can ...