std::lock_guard
From cppreference.com
| Defined in header <mutex>
|
||
| template< class Mutex > class lock_guard; |
(since C++11) | |
The class lock_guard is a mutex wrapper that provides a convenient RAII-style mechanism for owning a mutex for the duration of a scoped block.
When a lock_guard object is created, it attempts to take ownership of the mutex it is given. When control leaves the scope in which the lock_guard object was created, the lock_guard is destructed and the mutex is released.
The lock_guard class is non-copyable. The supplied Mutex type shall implement the Template:concept concept.
Member types
| Member type | Definition |
mutex_type
|
Mutex |
Member functions
Example
Run this code
#include <thread> #include <mutex> int g_i = 0; std::mutex g_i_mutex; // protects g_i void safe_increment() { std::lock_guard<std::mutex> lock(g_i_mutex); ++g_i; // g_i_mutex is automatically released when lock // goes out of scope } int main() { std::thread t1(safe_increment); std::thread t2(safe_increment); t1.join(); t2.join(); }
