mirror of
https://github.com/azure-rtos/threadx
synced 2025-02-06 08:08:27 +08:00
101 lines
5.3 KiB
C
101 lines
5.3 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_getvalue 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 updates the location referenced by the sval argument */
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/* to have the value of the semaphore referenced by sem without */
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/* affecting the state of the semaphore */
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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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/* *sval Buffer by which the value is returned. */
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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 fails */
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/* */
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/* CALLS */
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/* */
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/* None */
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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_getvalue(sem_t * sem,ULONG * sval)
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{
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TX_INTERRUPT_SAVE_AREA
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TX_SEMAPHORE *TheSem;
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/* get ThreadX semaphore. */
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TheSem = (TX_SEMAPHORE *)sem;
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/* First, 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(EINVAL);
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}
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/* Disable interrupts. */
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TX_DISABLE
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* sval = TheSem ->tx_semaphore_count;
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/* Restore Interrupts. */
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TX_RESTORE
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return(OK);
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}
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