734 B
734 B
PR_WaitSemaphore
Returns the value of the environment variable.
Syntax
#include <pripcsem.h>
NSPR_API(PRStatus) PR_WaitSemaphore(PRSem *sem);
Parameter
The function has the following parameter:
sem-
A pointer to a
PRSemstructure returned from a call to {ref}PR_OpenSemaphore.
Returns
{ref}PRStatus
Description
{ref}PR_WaitSemaphore tests the value of the semaphore. If the value of
the semaphore is > 0, the value of the semaphore is decremented and the
function returns. If the value of the semaphore is 0, the function
blocks until the value becomes > 0, then the semaphore is decremented
and the function returns.
The "test and decrement" operation is performed atomically.