mirror of
https://github.com/eclipse-threadx/threadx.git
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130 lines
5.7 KiB
C
130 lines
5.7 KiB
C
/***************************************************************************
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* Copyright (c) 2024 Microsoft Corporation
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*
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* This program and the accompanying materials are made available under the
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* terms of the MIT License which is available at
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* https://opensource.org/licenses/MIT.
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*
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* SPDX-License-Identifier: MIT
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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_trywait PORTABLE C */
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/* 6.1.7 */
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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 locks(takes) a semaphore if the semaphore is not */
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/* currently locked. */
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/* */
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/* INPUT */
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/* */
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/* *sem Pointer to 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 Returns generic error */
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/* tx_semaphore_get ThreadX Semaphore get */
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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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/* 06-02-2021 William E. Lamie Initial Version 6.1.7 */
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/* */
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/**************************************************************************/
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INT sem_trywait(sem_t * sem)
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{
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TX_SEMAPHORE * TheSem;
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INT retval;
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INT pxerror;
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/* Make sure we're calling this routine from a thread context. */
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if (!tx_thread_identify() )
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{
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/* No error in POSIX. */
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posix_internal_error(242);
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/* Return error. */
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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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/* error in POSIX. */
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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return (EINVAL);
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}
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else
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retval = tx_semaphore_get(TheSem,TX_NO_WAIT);
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switch(retval)
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{
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case TX_SUCCESS :
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sem->refCnt -= 1;
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pxerror = OK;
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break;
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case TX_NO_INSTANCE:
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posix_errno = EAGAIN;
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posix_set_pthread_errno(EAGAIN);
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pxerror = ERROR;
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break;
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case TX_DELETED :
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case TX_WAIT_ABORTED :
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case TX_SEMAPHORE_ERROR :
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case TX_WAIT_ERROR :
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/* No error in POSIX, give default. */
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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pxerror = ERROR;
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break;
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}
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return(pxerror);
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}
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