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/**************************************************************************/
/* */
/* Copyright (c) Microsoft Corporation. All rights reserved. */
/* */
/* This software is licensed under the Microsoft Software License */
/* Terms for Microsoft Azure RTOS. Full text of the license can be */
/* found in the LICENSE file at https://aka.ms/AzureRTOS_EULA */
/* and in the root directory of this software. */
/* */
/**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Mutex */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_initialize.h"
#include "tx_thread.h"
#ifndef TX_TIMER_PROCESS_IN_ISR
#include "tx_timer.h"
#endif
#include "tx_mutex.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _txe_mutex_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the mutex get function call. */
/* */
/* INPUT */
/* */
/* mutex_ptr Pointer to mutex control block */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* TX_MUTEX_ERROR Invalid mutex pointer */
/* TX_WAIT_ERROR Invalid wait option */
/* status Actual completion status */
/* */
/* CALLS */
/* */
/* _tx_mutex_get Actual get mutex function */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* RELEASE HISTORY */
/* */
/* DATE NAME DESCRIPTION */
/* */
/* 05-19-2020 William E. Lamie Initial Version 6.0 */
/* 09-30-2020 Yuxin Zhou Modified comment(s), */
/* resulting in version 6.1 */
/* */
/**************************************************************************/
UINT _txe_mutex_get(TX_MUTEX *mutex_ptr, ULONG wait_option)
{
UINT status;
#ifndef TX_TIMER_PROCESS_IN_ISR
TX_THREAD *current_thread;
#endif
/* Default status to success. */
status = TX_SUCCESS;
/* Check for an invalid mutex pointer. */
if (mutex_ptr == TX_NULL)
{
/* Mutex pointer is invalid, return appropriate error code. */
status = TX_MUTEX_ERROR;
}
/* Now check for a valid mutex ID. */
else if (mutex_ptr -> tx_mutex_id != TX_MUTEX_ID)
{
/* Mutex pointer is invalid, return appropriate error code. */
status = TX_MUTEX_ERROR;
}
else
{
/* Check for a wait option error. Only threads are allowed any form of
suspension. */
if (wait_option != TX_NO_WAIT)
{
/* Is the call from an ISR or Initialization? */
if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
{
/* A non-thread is trying to suspend, return appropriate error code. */
status = TX_WAIT_ERROR;
}
#ifndef TX_TIMER_PROCESS_IN_ISR
else
{
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(current_thread)
/* Is the current thread the timer thread? */
if (current_thread == &_tx_timer_thread)
{
/* A non-thread is trying to suspend, return appropriate error code. */
status = TX_WAIT_ERROR;
}
}
#endif
}
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
/* Check for interrupt call. */
if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
{
/* Now, make sure the call is from an interrupt and not initialization. */
if (TX_THREAD_GET_SYSTEM_STATE() < TX_INITIALIZE_IN_PROGRESS)
{
/* Yes, invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
}
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
/* Call actual get mutex function. */
status = _tx_mutex_get(mutex_ptr, wait_option);
}
/* Return completion status. */
return(status);
}
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