Ns_WaitForSemaphore

Overview

Wait for a semaphore count to be greater than zero.

Syntax

    int Ns_WaitForSemaphore(
    	Ns_Semaphore * sema
    );

Description

If the semaphore count is greater than zero, decrement it and continue. Otherwise, block until this is possible.

Example

    static Ns_Semaphore sem;
    
    void

Init(void)
    {
    	Ns_InitializeSemaphore(&sem, 0);
    }
    
    void
    Waiter(void)
    {
    	Ns_WaitForSemaphore(&sem);
    	... access resource ...
    }
    
    void
    Releaser(void)
    {
    	Ns_ReleaseSemaphore(&sem, 1);
    }

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