Condition_variable of C + + standard library

Conditon_variable (condition variable) for inter-thread synchronization

Condition_variable has 5 functions, function names and corresponding functions as follows:

Wait to block yourself, waiting to wake up

Wait_for block himself, wait for wake up, wait for a while

Wait_until blocks itself, waits to wake up, waits up to a certain point in time

Notify_one wakes up a thread waiting on this condition variable

Notify_all wakes all the threads waiting on this condition variable

The 3 wait functions require the entry of a locked unique_lock<mutex> variable, and there are two versions, one version accepts one comparator and the other does not. Use wait to illustrate:

void Wait (unique_lock<mutex> &lck);

Template<class predicate> void Wait (unique_lock<mutex> &lck,predicate pred);

The second version is similar to while (!pred ()) Wait (LCK) when multiple threads wait for a wake-up and contention resource at the same time; If the standard library does not provide this version, we can only write the code ourselves.

Condition_variable_any and condition_variable are basically the same, the difference is only the condition_variable requirements of the mutex can only be used unique_lock<mutex>, And Condition_variable_any is not limited.

Condition_variable of C + + standard library