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 toPR_OpenSemaphore.
Returns
Description
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.