117 lines
5.7 KiB
C
117 lines
5.7 KiB
C
/**************************************************************************/
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/* */
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/* Copyright (c) Microsoft Corporation. All rights reserved. */
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/* */
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/* This software is licensed under the Microsoft Software License */
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/* Terms for Microsoft Azure RTOS. Full text of the license can be */
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/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
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/* and in the root directory of this software. */
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/* */
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/**************************************************************************/
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/**************************************************************************/
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/**************************************************************************/
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/** */
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/** POSIX wrapper for THREADX */
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/** */
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/** */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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/* Include necessary system files. */
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#include "tx_api.h" /* Threadx API */
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#include "pthread.h" /* Posix API */
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#include "px_int.h" /* Posix helper functions */
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* sem_close PORTABLE C */
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/* 6.x */
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/* AUTHOR */
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/* */
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/* William E. Lamie, Microsoft Corporation */
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/* */
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/* DESCRIPTION */
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/* */
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/* This routine is called to indicate that the calling thread is */
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/* finished with the specified named semaphore, sem. */
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/* */
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/* INPUT */
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/* */
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/* sem type of semaphore */
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/* */
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/* OUTPUT */
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/* */
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/* OK If successful */
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/* ERROR If error occurs */
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/* */
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/* CALLS */
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/* */
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/* posix_internal_error Generic error handler */
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/* posix_sem_reset Resets the semaphore structure */
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/* tx_thread_identify Returns currently running thread */
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/* */
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/* CALLED BY */
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/* */
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/* Application Code */
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/* */
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/* RELEASE HISTORY */
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/* */
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/* DATE NAME DESCRIPTION */
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/* */
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/* xx-xx-xxxx William E. Lamie Initial Version 6.x */
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/* */
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/**************************************************************************/
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INT sem_close(sem_t * sem)
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{
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TX_SEMAPHORE * TheSem;
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TX_THREAD * Thethread;
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/* Make sure we're calling this routine from a thread context. */
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Thethread = tx_thread_identify();
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if (!Thethread)
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{
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/* Return appropriate error. */
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posix_internal_error(240);
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/* there is no error defined for this in POSIX, hence give default. */
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return(ERROR);
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}
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/* Get ThreadX semaphore. */
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TheSem = (TX_SEMAPHORE * )sem;
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/* Check for an invalid semaphore pointer. */
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if ((!TheSem) || (TheSem -> tx_semaphore_id != TX_SEMAPHORE_ID))
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{
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/* Return appropriate error. */
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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/* return error. */
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return(ERROR);
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}
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if(sem)
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sem->count -= 1;
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if(! (sem->count) )
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{
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if(sem->unlink_flag == TX_TRUE)
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{
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posix_sem_reset(sem );
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sem = NULL;
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}
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}
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return(OK);
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}
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