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ChorusOS 5.0 Features and Architecture Overview

POSIX Semaphores (POSIX-SEM)

The POSIX-SEM API is a compatible implementation of the POSIX 1003.1 semaphores API. For general information on this feature, see the POSIX standard (IEEE Std 1003.1 - 1993). This feature is simply a library that might or might not be linked to an application. It is not a feature that can be turned on or off when configuring a system.

POSIX Semaphores API

The POSIX semaphores API is summarized in the following table. Some of the calls listed are also included in other features:

Function 

Comment 

sem_open()

Open/initialize a semaphore 

sem_close()

Close a semaphore 

sem_init()

Initialize a semaphore 

sem_destroy()

Delete a semaphore 

sem_wait()

Wait on a semaphore 

sem_trywait()

Attempt to lock a semaphore 

sem_post()

Signal a semaphore 

sem_getvalue()

Get semaphore counter value 

sem_unlink()

Remove a named semaphore