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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_trywait PORTABLE C */
/* 6.1.7 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This routine locks(takes) a semaphore if the semaphore is not */
/* currently locked. */
/* */
/* INPUT */
/* */
/* *sem Pointer to Semaphore */
/* */
/* OUTPUT */
/* */
/* OK If successful */
/* ERROR If error occurs */
/* */
/* CALLS */
/* */
/* posix_internal_error Returns generic error */
/* tx_semaphore_get ThreadX Semaphore get */
/* tx_thread_identify Returns currently running thread */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
INT sem_trywait(sem_t * sem)
{
TX_SEMAPHORE * TheSem;
INT retval;
INT pxerror;
/* Make sure we're calling this routine from a thread context. */
if (!tx_thread_identify() )
{
/* No error in POSIX. */
posix_internal_error(242);
/* Return error. */
return (ERROR);
}
/* Get ThreadX semaphore. */
TheSem = (TX_SEMAPHORE *)sem;
/* Check for an invalid semaphore pointer. */
if ((!TheSem) || (TheSem -> tx_semaphore_id != TX_SEMAPHORE_ID))
{
/* error in POSIX. */
posix_errno = EINVAL;
posix_set_pthread_errno(EINVAL);
return (EINVAL);
}
else
retval = tx_semaphore_get(TheSem,TX_NO_WAIT);
switch(retval)
{
case TX_SUCCESS :
sem->refCnt -= 1;
pxerror = OK;
break;
case TX_NO_INSTANCE:
posix_errno = EAGAIN;
posix_set_pthread_errno(EAGAIN);
pxerror = ERROR;
break;
case TX_DELETED :
case TX_WAIT_ABORTED :
case TX_SEMAPHORE_ERROR :
case TX_WAIT_ERROR :
/* No error in POSIX, give default. */
posix_errno = EINVAL;
posix_set_pthread_errno(EINVAL);
pxerror = ERROR;
break;
}
return(pxerror);
}
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