224 lines
8.7 KiB
C
224 lines
8.7 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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/** ThreadX Component */
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/** */
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/** Mutex */
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/** */
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/**************************************************************************/
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/**************************************************************************/
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#define TX_SOURCE_CODE
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/* Include necessary system files. */
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#include "tx_api.h"
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#include "tx_initialize.h"
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#include "tx_thread.h"
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#include "tx_timer.h"
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#include "tx_mutex.h"
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _txe_mutex_create PORTABLE C */
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/* 6.1 */
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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 checks for errors in the create mutex function */
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/* call. */
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/* */
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/* INPUT */
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/* */
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/* mutex_ptr Pointer to mutex control block */
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/* name_ptr Pointer to mutex name */
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/* inherit Initial mutex count */
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/* mutex_control_block_size Size of mutex control block */
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/* */
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/* OUTPUT */
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/* */
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/* TX_MUTEX_ERROR Invalid mutex pointer */
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/* TX_CALLER_ERROR Invalid caller of this function */
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/* TX_INHERIT_ERROR Invalid inherit option */
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/* status Actual completion status */
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/* */
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/* CALLS */
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/* */
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/* _tx_mutex_create Actual create mutex function */
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/* _tx_thread_system_preempt_check Check for preemption */
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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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/* 05-19-2020 William E. Lamie Initial Version 6.0 */
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/* 09-30-2020 Yuxin Zhou Modified comment(s), */
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/* resulting in version 6.1 */
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/* */
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/**************************************************************************/
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UINT _txe_mutex_create(TX_MUTEX *mutex_ptr, CHAR *name_ptr, UINT inherit, UINT mutex_control_block_size)
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{
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TX_INTERRUPT_SAVE_AREA
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UINT status;
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ULONG i;
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TX_MUTEX *next_mutex;
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#ifndef TX_TIMER_PROCESS_IN_ISR
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TX_THREAD *thread_ptr;
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#endif
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/* Default status to success. */
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status = TX_SUCCESS;
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/* Check for an invalid mutex pointer. */
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if (mutex_ptr == TX_NULL)
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{
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/* Mutex pointer is invalid, return appropriate error code. */
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status = TX_MUTEX_ERROR;
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}
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/* Now check to make sure the control block is the correct size. */
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else if (mutex_control_block_size != (sizeof(TX_MUTEX)))
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{
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/* Mutex pointer is invalid, return appropriate error code. */
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status = TX_MUTEX_ERROR;
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}
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else
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{
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/* Disable interrupts. */
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TX_DISABLE
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/* Increment the preempt disable flag. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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/* Next see if it is already in the created list. */
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next_mutex = _tx_mutex_created_ptr;
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for (i = ((ULONG) 0); i < _tx_mutex_created_count; i++)
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{
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/* Determine if this mutex matches the mutex in the list. */
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if (mutex_ptr == next_mutex)
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{
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break;
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}
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else
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{
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/* Move to the next mutex. */
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next_mutex = next_mutex -> tx_mutex_created_next;
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}
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}
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/* Disable interrupts. */
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TX_DISABLE
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/* Decrement the preempt disable flag. */
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_tx_thread_preempt_disable--;
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/* Restore interrupts. */
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TX_RESTORE
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/* Check for preemption. */
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_tx_thread_system_preempt_check();
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/* At this point, check to see if there is a duplicate mutex. */
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if (mutex_ptr == next_mutex)
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{
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/* Mutex is already created, return appropriate error code. */
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status = TX_MUTEX_ERROR;
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}
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else
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{
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/* Check for a valid inherit option. */
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if (inherit != TX_INHERIT)
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{
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if (inherit != TX_NO_INHERIT)
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{
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/* Inherit option is illegal. */
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status = TX_INHERIT_ERROR;
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}
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}
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}
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}
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/* Determine if everything is okay. */
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if (status == TX_SUCCESS)
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{
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#ifndef TX_TIMER_PROCESS_IN_ISR
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/* Pickup thread pointer. */
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TX_THREAD_GET_CURRENT(thread_ptr)
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/* Check for invalid caller of this function. First check for a calling thread. */
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if (thread_ptr == &_tx_timer_thread)
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{
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/* Invalid caller of this function, return appropriate error code. */
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status = TX_CALLER_ERROR;
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}
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#endif
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/* Check for interrupt call. */
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if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
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{
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/* Now, make sure the call is from an interrupt and not initialization. */
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if (TX_THREAD_GET_SYSTEM_STATE() < TX_INITIALIZE_IN_PROGRESS)
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{
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/* Invalid caller of this function, return appropriate error code. */
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status = TX_CALLER_ERROR;
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}
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}
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}
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/* Determine if everything is okay. */
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if (status == TX_SUCCESS)
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{
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/* Call actual mutex create function. */
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status = _tx_mutex_create(mutex_ptr, name_ptr, inherit);
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}
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/* Return completion status. */
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return(status);
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}
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