mirror of
https://github.com/azure-rtos/threadx
synced 2025-02-06 08:08:27 +08:00
120 lines
5.5 KiB
C
120 lines
5.5 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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/* posix_find_sem 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 returns sem descriptor indicating that name of */
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/* in the semaphore exists. */
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/* */
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/* INPUT */
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/* */
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/* const char * name Name of the semaphore. */
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/* */
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/* OUTPUT */
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/* */
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/* sem 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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/* POSIX internal 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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/* 08-02-2021 Scott Larson Removed unneeded semicolon, */
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/* resulting in version 6.1.8 */
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/* */
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/**************************************************************************/
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sem_t* posix_find_sem(const CHAR * name)
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{
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sem_t *sem;
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ULONG index;
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ULONG match;
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CHAR *dummy_name;
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CHAR *dummy_sem_name;
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ULONG namelength;
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/* For checking the name. */
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for(index = 0,sem = posix_sem_pool;index < SEM_NSEMS_MAX;index ++,sem ++)
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{
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/* Assume the worst case. */
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match = TX_FALSE;
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dummy_sem_name = sem->sem_name;
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for(namelength = 0 ,dummy_name = (CHAR *)name ; namelength < 10 ;
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namelength ++, dummy_name++,dummy_sem_name ++)
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{
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/* Copy name. */
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if(* dummy_name == * dummy_sem_name)
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{
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/* End of the string. */
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if(* dummy_name == '\0')
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{
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match = TX_TRUE;
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break;
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}
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}/* Copy name. */
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else
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break;
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}
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/* Stop searching. */
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if ( match == TX_TRUE)
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{
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break;
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}
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}/* For each semaphore. */
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if(match == TX_TRUE)
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{
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return(sem);
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}
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/* return NULL. */
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sem = NULL;
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return(sem);
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}
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