mirror of
https://github.com/azure-rtos/threadx
synced 2025-02-06 08:08:27 +08:00
104 lines
5.6 KiB
C
104 lines
5.6 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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/* pthread_mutex_lock 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 function locks the mutex object referenced. If the mutex is */
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/* already locked, the calling thread shall block until the mutex */
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/* becomes available. This operation shall return with the mutex object*/
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/* referenced by mutex in the locked state with the calling thread as */
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/* its owner. */
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/* */
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/* INPUT */
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/* */
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/* mutex Address of the mutex */
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/* */
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/* OUTPUT */
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/* */
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/* 0 if successful */
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/* Value in case of any error */
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/* */
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/* CALLS */
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/* */
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/* tx_thread_identify Get calling thread's pointer */
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/* tx_mutex_get ThreadX Mutex Service */
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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 pthread_mutex_lock(pthread_mutex_t *mutex )
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{
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TX_MUTEX *mutex_ptr;
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TX_THREAD *thread_ptr;
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INT retval,status;
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mutex_ptr = (TX_MUTEX*)mutex;
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thread_ptr = tx_thread_identify();
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if ( (mutex_ptr->tx_mutex_ownership_count > 0 ) && (thread_ptr == (mutex_ptr->tx_mutex_owner )))
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{
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posix_errno = EDEADLK;
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posix_set_pthread_errno(EINVAL);
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return (EDEADLK);
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}
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status = tx_mutex_get( mutex_ptr, TX_WAIT_FOREVER);
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switch ( status)
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{
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case TX_SUCCESS:
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retval = OK;
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break;
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default:
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posix_errno = EINVAL;
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posix_set_pthread_errno(EINVAL);
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retval = EINVAL;
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break;
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}
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return(retval);
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}
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