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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** POSIX wrapper for THREADX */
/** */
/** */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#include "tx_api.h" /* Threadx API */
#include "pthread.h" /* Posix API */
#include "px_int.h" /* Posix helper functions */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* sem_close PORTABLE C */
/* 6.1.7 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This routine is called to indicate that the calling thread is */
/* finished with the specified named semaphore, sem. */
/* */
/* INPUT */
/* */
/* sem type of semaphore */
/* */
/* OUTPUT */
/* */
/* OK If successful */
/* ERROR If error occurs */
/* */
/* CALLS */
/* */
/* posix_internal_error Generic error handler */
/* posix_sem_reset Resets the semaphore structure */
/* tx_thread_identify Returns currently running thread */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
INT sem_close(sem_t * sem)
{
TX_SEMAPHORE * TheSem;
TX_THREAD * Thethread;
/* Make sure we're calling this routine from a thread context. */
Thethread = tx_thread_identify();
if (!Thethread)
{
/* Return appropriate error. */
posix_internal_error(240);
/* there is no error defined for this in POSIX, hence give default. */
return(ERROR);
}
/* Get ThreadX semaphore. */
TheSem = (TX_SEMAPHORE * )sem;
/* Check for an invalid semaphore pointer. */
if ((!TheSem) || (TheSem -> tx_semaphore_id != TX_SEMAPHORE_ID))
{
/* Return appropriate error. */
posix_errno = EINVAL;
posix_set_pthread_errno(EINVAL);
/* return error. */
return(ERROR);
}
if(sem)
sem->count -= 1;
if(! (sem->count) )
{
if(sem->unlink_flag == TX_TRUE)
{
posix_sem_reset(sem );
sem = NULL;
}
}
return(OK);
}
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