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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"
#include "tx_timer.h"
#include "tx_mutex.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _txe_mutex_create PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the create mutex function */
/* call. */
/* */
/* INPUT */
/* */
/* mutex_ptr Pointer to mutex control block */
/* name_ptr Pointer to mutex name */
/* inherit Initial mutex count */
/* mutex_control_block_size Size of mutex control block */
/* */
/* OUTPUT */
/* */
/* TX_MUTEX_ERROR Invalid mutex pointer */
/* TX_CALLER_ERROR Invalid caller of this function */
/* TX_INHERIT_ERROR Invalid inherit option */
/* status Actual completion status */
/* */
/* CALLS */
/* */
/* _tx_mutex_create Actual create mutex function */
/* _tx_thread_system_preempt_check Check for preemption */
/* */
/* 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_create(TX_MUTEX *mutex_ptr, CHAR *name_ptr, UINT inherit, UINT mutex_control_block_size)
{
TX_INTERRUPT_SAVE_AREA
UINT status;
ULONG i;
TX_MUTEX *next_mutex;
#ifndef TX_TIMER_PROCESS_IN_ISR
TX_THREAD *thread_ptr;
#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 to make sure the control block is the correct size. */
else if (mutex_control_block_size != (sizeof(TX_MUTEX)))
{
/* Mutex pointer is invalid, return appropriate error code. */
status = TX_MUTEX_ERROR;
}
else
{
/* Disable interrupts. */
TX_DISABLE
/* Increment the preempt disable flag. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Next see if it is already in the created list. */
next_mutex = _tx_mutex_created_ptr;
for (i = ((ULONG) 0); i < _tx_mutex_created_count; i++)
{
/* Determine if this mutex matches the mutex in the list. */
if (mutex_ptr == next_mutex)
{
break;
}
else
{
/* Move to the next mutex. */
next_mutex = next_mutex -> tx_mutex_created_next;
}
}
/* Disable interrupts. */
TX_DISABLE
/* Decrement the preempt disable flag. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Check for preemption. */
_tx_thread_system_preempt_check();
/* At this point, check to see if there is a duplicate mutex. */
if (mutex_ptr == next_mutex)
{
/* Mutex is already created, return appropriate error code. */
status = TX_MUTEX_ERROR;
}
else
{
/* Check for a valid inherit option. */
if (inherit != TX_INHERIT)
{
if (inherit != TX_NO_INHERIT)
{
/* Inherit option is illegal. */
status = TX_INHERIT_ERROR;
}
}
}
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
#ifndef TX_TIMER_PROCESS_IN_ISR
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(thread_ptr)
/* Check for invalid caller of this function. First check for a calling thread. */
if (thread_ptr == &_tx_timer_thread)
{
/* Invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
#endif
/* 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)
{
/* Invalid caller of this function, return appropriate error code. */
status = TX_CALLER_ERROR;
}
}
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
/* Call actual mutex create function. */
status = _tx_mutex_create(mutex_ptr, name_ptr, inherit);
}
/* Return completion status. */
return(status);
}