std::mutex::unlock

Since C++11

Unlocks the mutex.

# Declarations

void unlock();

(since C++11)

# Return value

(none)

# Notes

unlock() is usually not called directly: std::unique_lock and std::lock_guard are used to manage exclusive locking.

# Example

#include <chrono>
#include <iostream>
#include <mutex>
#include <thread>
 
int g_num = 0; // protected by g_num_mutex
std::mutex g_num_mutex;
 
void slow_increment(int id) 
{
    for (int i = 0; i < 3; ++i)
    {
        g_num_mutex.lock();
        int g_num_running = ++g_num;
        g_num_mutex.unlock();
        std::cout << id << " => " << g_num_running << '\n';
 
        std::this_thread::sleep_for(std::chrono::seconds(1));
    }
}
 
int main()
{
    std::thread t1(slow_increment, 0);
    std::thread t2(slow_increment, 1);
    t1.join();
    t2.join();
}

# See also