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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 */
/* */
/* pthread_mutex_lock PORTABLE C */
/* 6.1.7 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function locks the mutex object referenced. If the mutex is */
/* already locked, the calling thread shall block until the mutex */
/* becomes available. This operation shall return with the mutex object*/
/* referenced by mutex in the locked state with the calling thread as */
/* its owner. */
/* */
/* INPUT */
/* */
/* mutex Address of the mutex */
/* */
/* OUTPUT */
/* */
/* 0 if successful */
/* Value in case of any error */
/* */
/* CALLS */
/* */
/* tx_thread_identify Get calling thread's pointer */
/* tx_mutex_get ThreadX Mutex Service */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
INT pthread_mutex_lock(pthread_mutex_t *mutex )
{
TX_MUTEX *mutex_ptr;
TX_THREAD *thread_ptr;
INT retval,status;
mutex_ptr = (TX_MUTEX*)mutex;
thread_ptr = tx_thread_identify();
if ( (mutex_ptr->tx_mutex_ownership_count > 0 ) && (thread_ptr == (mutex_ptr->tx_mutex_owner )))
{
posix_errno = EDEADLK;
posix_set_pthread_errno(EINVAL);
return (EDEADLK);
}
status = tx_mutex_get( mutex_ptr, TX_WAIT_FOREVER);
switch ( status)
{
case TX_SUCCESS:
retval = OK;
break;
default:
posix_errno = EINVAL;
posix_set_pthread_errno(EINVAL);
retval = EINVAL;
break;
}
return(retval);
}
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