657 lines
29 KiB
C
657 lines
29 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_trace.h"
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#include "tx_thread.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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/* _tx_mutex_put 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 puts back an instance of the specified mutex. */
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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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/* */
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/* OUTPUT */
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/* */
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/* TX_SUCCESS Success completion status */
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/* */
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/* CALLS */
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/* */
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/* _tx_thread_system_preempt_check Check for preemption */
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/* _tx_thread_system_resume Resume thread service */
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/* _tx_thread_system_ni_resume Non-interruptable resume thread */
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/* _tx_mutex_priority_change Restore previous thread priority */
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/* _tx_mutex_prioritize Prioritize the mutex suspension */
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/* _tx_mutex_thread_release Release all thread's mutexes */
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/* _tx_mutex_delete Release ownership upon mutex */
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/* deletion */
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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 _tx_mutex_put(TX_MUTEX *mutex_ptr)
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{
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TX_INTERRUPT_SAVE_AREA
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TX_THREAD *thread_ptr;
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TX_THREAD *old_owner;
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UINT old_priority;
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UINT status;
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TX_MUTEX *next_mutex;
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TX_MUTEX *previous_mutex;
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UINT owned_count;
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UINT suspended_count;
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TX_THREAD *current_thread;
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TX_THREAD *next_thread;
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TX_THREAD *previous_thread;
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TX_THREAD *suspended_thread;
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UINT inheritance_priority;
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/* Setup status to indicate the processing is not complete. */
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status = TX_NOT_DONE;
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/* Disable interrupts to put an instance back to the mutex. */
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TX_DISABLE
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#ifdef TX_MUTEX_ENABLE_PERFORMANCE_INFO
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/* Increment the total mutex put counter. */
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_tx_mutex_performance_put_count++;
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/* Increment the number of attempts to put this mutex. */
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mutex_ptr -> tx_mutex_performance_put_count++;
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#endif
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/* If trace is enabled, insert this event into the trace buffer. */
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TX_TRACE_IN_LINE_INSERT(TX_TRACE_MUTEX_PUT, mutex_ptr, TX_POINTER_TO_ULONG_CONVERT(mutex_ptr -> tx_mutex_owner), mutex_ptr -> tx_mutex_ownership_count, TX_POINTER_TO_ULONG_CONVERT(&old_priority), TX_TRACE_MUTEX_EVENTS)
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/* Log this kernel call. */
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TX_EL_MUTEX_PUT_INSERT
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/* Determine if this mutex is owned. */
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if (mutex_ptr -> tx_mutex_ownership_count != ((UINT) 0))
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{
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/* Pickup the owning thread pointer. */
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thread_ptr = mutex_ptr -> tx_mutex_owner;
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/* Pickup thread pointer. */
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TX_THREAD_GET_CURRENT(current_thread)
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/* Check to see if the mutex is owned by the calling thread. */
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if (mutex_ptr -> tx_mutex_owner != current_thread)
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{
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/* Determine if the preempt disable flag is set, indicating that
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the caller is not the application but from ThreadX. In such
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cases, the thread mutex owner does not need to match. */
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if (_tx_thread_preempt_disable == ((UINT) 0))
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{
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/* Invalid mutex release. */
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/* Restore interrupts. */
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TX_RESTORE
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/* Caller does not own the mutex. */
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status = TX_NOT_OWNED;
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}
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}
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/* Determine if we should continue. */
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if (status == TX_NOT_DONE)
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{
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/* Decrement the mutex ownership count. */
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mutex_ptr -> tx_mutex_ownership_count--;
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/* Determine if the mutex is still owned by the current thread. */
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if (mutex_ptr -> tx_mutex_ownership_count != ((UINT) 0))
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{
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/* Restore interrupts. */
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TX_RESTORE
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/* Mutex is still owned, just return successful status. */
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status = TX_SUCCESS;
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}
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else
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{
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/* Check for a NULL thread pointer, which can only happen during initialization. */
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if (thread_ptr == TX_NULL)
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{
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/* Restore interrupts. */
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TX_RESTORE
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/* Mutex is now available, return successful status. */
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status = TX_SUCCESS;
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}
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else
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{
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/* The mutex is now available. */
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/* Remove this mutex from the owned mutex list. */
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/* Decrement the ownership count. */
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thread_ptr -> tx_thread_owned_mutex_count--;
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/* Determine if this mutex was the only one on the list. */
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if (thread_ptr -> tx_thread_owned_mutex_count == ((UINT) 0))
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{
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/* Yes, the list is empty. Simply set the head pointer to NULL. */
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thread_ptr -> tx_thread_owned_mutex_list = TX_NULL;
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}
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else
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{
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/* No, there are more mutexes on the list. */
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/* Link-up the neighbors. */
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next_mutex = mutex_ptr -> tx_mutex_owned_next;
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previous_mutex = mutex_ptr -> tx_mutex_owned_previous;
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next_mutex -> tx_mutex_owned_previous = previous_mutex;
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previous_mutex -> tx_mutex_owned_next = next_mutex;
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/* See if we have to update the created list head pointer. */
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if (thread_ptr -> tx_thread_owned_mutex_list == mutex_ptr)
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{
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/* Yes, move the head pointer to the next link. */
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thread_ptr -> tx_thread_owned_mutex_list = next_mutex;
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}
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}
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/* Determine if the simple, non-suspension, non-priority inheritance case is present. */
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if (mutex_ptr -> tx_mutex_suspension_list == TX_NULL)
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{
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/* Is this a priority inheritance mutex? */
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if (mutex_ptr -> tx_mutex_inherit == TX_FALSE)
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{
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/* Yes, we are done - set the mutex owner to NULL. */
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mutex_ptr -> tx_mutex_owner = TX_NULL;
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/* Restore interrupts. */
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TX_RESTORE
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/* Mutex is now available, return successful status. */
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status = TX_SUCCESS;
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}
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}
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/* Determine if the processing is complete. */
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if (status == TX_NOT_DONE)
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{
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/* Initialize original owner and thread priority. */
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old_owner = TX_NULL;
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old_priority = thread_ptr -> tx_thread_user_priority;
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/* Does this mutex support priority inheritance? */
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if (mutex_ptr -> tx_mutex_inherit == TX_TRUE)
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{
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#ifndef TX_NOT_INTERRUPTABLE
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/* Temporarily disable preemption. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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#endif
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/* Default the inheritance priority to disabled. */
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inheritance_priority = ((UINT) TX_MAX_PRIORITIES);
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/* Search the owned mutexes for this thread to determine the highest priority for this
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former mutex owner to return to. */
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next_mutex = thread_ptr -> tx_thread_owned_mutex_list;
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while (next_mutex != TX_NULL)
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{
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/* Does this mutex support priority inheritance? */
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if (next_mutex -> tx_mutex_inherit == TX_TRUE)
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{
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/* Determine if highest priority field of the mutex is higher than the priority to
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restore. */
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if (next_mutex -> tx_mutex_highest_priority_waiting < inheritance_priority)
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{
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/* Use this priority to return releasing thread to. */
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inheritance_priority = next_mutex -> tx_mutex_highest_priority_waiting;
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}
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}
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/* Move mutex pointer to the next mutex in the list. */
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next_mutex = next_mutex -> tx_mutex_owned_next;
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/* Are we at the end of the list? */
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if (next_mutex == thread_ptr -> tx_thread_owned_mutex_list)
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{
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/* Yes, set the next mutex to NULL. */
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next_mutex = TX_NULL;
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}
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}
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#ifndef TX_NOT_INTERRUPTABLE
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/* Disable interrupts. */
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TX_DISABLE
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/* Undo the temporarily preemption disable. */
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_tx_thread_preempt_disable--;
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#endif
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/* Set the inherit priority to that of the highest priority thread waiting on the mutex. */
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thread_ptr -> tx_thread_inherit_priority = inheritance_priority;
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/* Determine if the inheritance priority is less than the default old priority. */
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if (inheritance_priority < old_priority)
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{
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/* Yes, update the old priority. */
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old_priority = inheritance_priority;
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}
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}
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/* Determine if priority inheritance is in effect and there are one or more
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threads suspended on the mutex. */
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if (mutex_ptr -> tx_mutex_suspended_count > ((UINT) 1))
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{
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/* Is priority inheritance in effect? */
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if (mutex_ptr -> tx_mutex_inherit == TX_TRUE)
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{
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/* Yes, this code is simply to ensure the highest priority thread is positioned
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at the front of the suspension list. */
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#ifndef TX_NOT_INTERRUPTABLE
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/* Temporarily disable preemption. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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#endif
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/* Call the mutex prioritize processing to ensure the
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highest priority thread is resumed. */
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#ifdef TX_MISRA_ENABLE
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do
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{
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status = _tx_mutex_prioritize(mutex_ptr);
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} while (status != TX_SUCCESS);
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#else
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_tx_mutex_prioritize(mutex_ptr);
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#endif
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/* At this point, the highest priority thread is at the
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front of the suspension list. */
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/* Optional processing extension. */
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TX_MUTEX_PUT_EXTENSION_1
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#ifndef TX_NOT_INTERRUPTABLE
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/* Disable interrupts. */
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TX_DISABLE
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/* Back off the preemption disable. */
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_tx_thread_preempt_disable--;
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#endif
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}
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}
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/* Now determine if there are any threads still waiting on the mutex. */
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if (mutex_ptr -> tx_mutex_suspension_list == TX_NULL)
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{
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/* No, there are no longer any threads waiting on the mutex. */
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#ifndef TX_NOT_INTERRUPTABLE
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/* Temporarily disable preemption. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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#endif
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/* Mutex is not owned, but it is possible that a thread that
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caused a priority inheritance to occur is no longer waiting
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on the mutex. */
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/* Setup the highest priority waiting thread. */
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mutex_ptr -> tx_mutex_highest_priority_waiting = (UINT) TX_MAX_PRIORITIES;
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/* Determine if we need to restore priority. */
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if ((mutex_ptr -> tx_mutex_owner) -> tx_thread_priority != old_priority)
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{
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/* Yes, restore the priority of thread. */
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_tx_mutex_priority_change(mutex_ptr -> tx_mutex_owner, old_priority);
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}
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#ifndef TX_NOT_INTERRUPTABLE
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/* Disable interrupts again. */
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TX_DISABLE
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/* Back off the preemption disable. */
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_tx_thread_preempt_disable--;
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#endif
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/* Set the mutex owner to NULL. */
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mutex_ptr -> tx_mutex_owner = TX_NULL;
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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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/* Set status to success. */
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status = TX_SUCCESS;
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}
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else
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{
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/* Pickup the thread at the front of the suspension list. */
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thread_ptr = mutex_ptr -> tx_mutex_suspension_list;
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/* Save the previous ownership information, if inheritance is
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in effect. */
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if (mutex_ptr -> tx_mutex_inherit == TX_TRUE)
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{
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/* Remember the old mutex owner. */
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old_owner = mutex_ptr -> tx_mutex_owner;
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/* Setup owner thread priority information. */
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mutex_ptr -> tx_mutex_original_priority = thread_ptr -> tx_thread_priority;
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/* Setup the highest priority waiting thread. */
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mutex_ptr -> tx_mutex_highest_priority_waiting = (UINT) TX_MAX_PRIORITIES;
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}
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/* Determine how many mutexes are owned by this thread. */
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owned_count = thread_ptr -> tx_thread_owned_mutex_count;
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/* Determine if this thread owns any other mutexes that have priority inheritance. */
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if (owned_count == ((UINT) 0))
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{
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/* The owned mutex list is empty. Add mutex to empty list. */
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thread_ptr -> tx_thread_owned_mutex_list = mutex_ptr;
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mutex_ptr -> tx_mutex_owned_next = mutex_ptr;
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mutex_ptr -> tx_mutex_owned_previous = mutex_ptr;
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}
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else
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{
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/* Non-empty list. Link up the mutex. */
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/* Pickup tail pointer. */
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next_mutex = thread_ptr -> tx_thread_owned_mutex_list;
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previous_mutex = next_mutex -> tx_mutex_owned_previous;
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/* Place the owned mutex in the list. */
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next_mutex -> tx_mutex_owned_previous = mutex_ptr;
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previous_mutex -> tx_mutex_owned_next = mutex_ptr;
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/* Setup this mutex's next and previous created links. */
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mutex_ptr -> tx_mutex_owned_previous = previous_mutex;
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mutex_ptr -> tx_mutex_owned_next = next_mutex;
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}
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/* Increment the number of mutexes owned counter. */
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thread_ptr -> tx_thread_owned_mutex_count = owned_count + ((UINT) 1);
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/* Mark the Mutex as owned and fill in the corresponding information. */
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mutex_ptr -> tx_mutex_ownership_count = (UINT) 1;
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mutex_ptr -> tx_mutex_owner = thread_ptr;
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/* Remove the suspended thread from the list. */
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/* Decrement the suspension count. */
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mutex_ptr -> tx_mutex_suspended_count--;
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/* Pickup the suspended count. */
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suspended_count = mutex_ptr -> tx_mutex_suspended_count;
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/* See if this is the only suspended thread on the list. */
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if (suspended_count == TX_NO_SUSPENSIONS)
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{
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/* Yes, the only suspended thread. */
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/* Update the head pointer. */
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mutex_ptr -> tx_mutex_suspension_list = TX_NULL;
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}
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else
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{
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/* At least one more thread is on the same expiration list. */
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/* Update the list head pointer. */
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next_thread = thread_ptr -> tx_thread_suspended_next;
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mutex_ptr -> tx_mutex_suspension_list = next_thread;
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/* Update the links of the adjacent threads. */
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previous_thread = thread_ptr -> tx_thread_suspended_previous;
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next_thread -> tx_thread_suspended_previous = previous_thread;
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previous_thread -> tx_thread_suspended_next = next_thread;
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}
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/* Prepare for resumption of the first thread. */
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/* Clear cleanup routine to avoid timeout. */
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thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
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/* Put return status into the thread control block. */
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thread_ptr -> tx_thread_suspend_status = TX_SUCCESS;
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#ifdef TX_NOT_INTERRUPTABLE
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/* Determine if priority inheritance is enabled for this mutex. */
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if (mutex_ptr -> tx_mutex_inherit == TX_TRUE)
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{
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/* Yes, priority inheritance is requested. */
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/* Determine if there are any more threads still suspended on the mutex. */
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if (mutex_ptr -> tx_mutex_suspended_count != ((ULONG) 0))
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{
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/* Determine if there are more than one thread suspended on the mutex. */
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if (mutex_ptr -> tx_mutex_suspended_count > ((ULONG) 1))
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{
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/* If so, prioritize the list so the highest priority thread is placed at the
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front of the suspension list. */
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#ifdef TX_MISRA_ENABLE
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do
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{
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status = _tx_mutex_prioritize(mutex_ptr);
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} while (status != TX_SUCCESS);
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#else
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_tx_mutex_prioritize(mutex_ptr);
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#endif
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}
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/* Now, pickup the list head and set the priority. */
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/* Determine if there still are threads suspended for this mutex. */
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suspended_thread = mutex_ptr -> tx_mutex_suspension_list;
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if (suspended_thread != TX_NULL)
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{
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/* Setup the highest priority thread waiting on this mutex. */
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mutex_ptr -> tx_mutex_highest_priority_waiting = suspended_thread -> tx_thread_priority;
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}
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}
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/* Restore previous priority needs to be restored after priority
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inheritance. */
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/* Determine if we need to restore priority. */
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if (old_owner -> tx_thread_priority != old_priority)
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{
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/* Restore priority of thread. */
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_tx_mutex_priority_change(old_owner, old_priority);
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}
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}
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|
/* Resume the thread! */
|
|
_tx_thread_system_ni_resume(thread_ptr);
|
|
|
|
/* Restore interrupts. */
|
|
TX_RESTORE
|
|
#else
|
|
|
|
/* Temporarily disable preemption. */
|
|
_tx_thread_preempt_disable++;
|
|
|
|
/* Restore interrupts. */
|
|
TX_RESTORE
|
|
|
|
/* Determine if priority inheritance is enabled for this mutex. */
|
|
if (mutex_ptr -> tx_mutex_inherit == TX_TRUE)
|
|
{
|
|
|
|
/* Yes, priority inheritance is requested. */
|
|
|
|
/* Determine if there are any more threads still suspended on the mutex. */
|
|
if (mutex_ptr -> tx_mutex_suspended_count != TX_NO_SUSPENSIONS)
|
|
{
|
|
|
|
/* Prioritize the list so the highest priority thread is placed at the
|
|
front of the suspension list. */
|
|
#ifdef TX_MISRA_ENABLE
|
|
do
|
|
{
|
|
status = _tx_mutex_prioritize(mutex_ptr);
|
|
} while (status != TX_SUCCESS);
|
|
#else
|
|
_tx_mutex_prioritize(mutex_ptr);
|
|
#endif
|
|
|
|
/* Now, pickup the list head and set the priority. */
|
|
|
|
/* Optional processing extension. */
|
|
TX_MUTEX_PUT_EXTENSION_2
|
|
|
|
/* Disable interrupts. */
|
|
TX_DISABLE
|
|
|
|
/* Determine if there still are threads suspended for this mutex. */
|
|
suspended_thread = mutex_ptr -> tx_mutex_suspension_list;
|
|
if (suspended_thread != TX_NULL)
|
|
{
|
|
|
|
/* Setup the highest priority thread waiting on this mutex. */
|
|
mutex_ptr -> tx_mutex_highest_priority_waiting = suspended_thread -> tx_thread_priority;
|
|
}
|
|
|
|
/* Restore interrupts. */
|
|
TX_RESTORE
|
|
}
|
|
|
|
/* Restore previous priority needs to be restored after priority
|
|
inheritance. */
|
|
|
|
/* Is the priority different? */
|
|
if (old_owner -> tx_thread_priority != old_priority)
|
|
{
|
|
|
|
/* Restore the priority of thread. */
|
|
_tx_mutex_priority_change(old_owner, old_priority);
|
|
}
|
|
}
|
|
|
|
/* Resume thread. */
|
|
_tx_thread_system_resume(thread_ptr);
|
|
#endif
|
|
|
|
/* Return a successful status. */
|
|
status = TX_SUCCESS;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
|
|
/* Restore interrupts. */
|
|
TX_RESTORE
|
|
|
|
/* Caller does not own the mutex. */
|
|
status = TX_NOT_OWNED;
|
|
}
|
|
|
|
/* Return the completion status. */
|
|
return(status);
|
|
}
|
|
|