246 lines
9.5 KiB
C
246 lines
9.5 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_delete 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 deletes the specified mutex. All threads */
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/* suspended on the mutex are resumed with the TX_DELETED status */
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/* code. */
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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 Successful completion status */
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/* */
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/* CALLS */
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/* */
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/* _tx_mutex_put Release an owned mutex */
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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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/* */
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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_delete(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 *next_thread;
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TX_THREAD *owner_thread;
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UINT suspended_count;
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TX_MUTEX *next_mutex;
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TX_MUTEX *previous_mutex;
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#ifdef TX_MISRA_ENABLE
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UINT status;
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#endif
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/* Disable interrupts to remove the mutex from the created list. */
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TX_DISABLE
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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_DELETE, mutex_ptr, TX_POINTER_TO_ULONG_CONVERT(&thread_ptr), 0, 0, TX_TRACE_MUTEX_EVENTS)
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/* Optional mutex delete extended processing. */
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TX_MUTEX_DELETE_EXTENSION(mutex_ptr)
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/* If trace is enabled, unregister this object. */
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TX_TRACE_OBJECT_UNREGISTER(mutex_ptr)
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/* Log this kernel call. */
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TX_EL_MUTEX_DELETE_INSERT
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/* Clear the mutex ID to make it invalid. */
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mutex_ptr -> tx_mutex_id = TX_CLEAR_ID;
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/* Decrement the created count. */
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_tx_mutex_created_count--;
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/* See if the mutex is the only one on the list. */
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if (_tx_mutex_created_count == TX_EMPTY)
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{
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/* Only created mutex, just set the created list to NULL. */
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_tx_mutex_created_ptr = TX_NULL;
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}
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else
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{
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/* Link-up the neighbors. */
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next_mutex = mutex_ptr -> tx_mutex_created_next;
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previous_mutex = mutex_ptr -> tx_mutex_created_previous;
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next_mutex -> tx_mutex_created_previous = previous_mutex;
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previous_mutex -> tx_mutex_created_next = next_mutex;
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/* See if we have to update the created list head pointer. */
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if (_tx_mutex_created_ptr == mutex_ptr)
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{
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/* Yes, move the head pointer to the next link. */
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_tx_mutex_created_ptr = next_mutex;
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}
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}
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/* Temporarily disable preemption. */
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_tx_thread_preempt_disable++;
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/* Pickup the suspension information. */
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thread_ptr = mutex_ptr -> tx_mutex_suspension_list;
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mutex_ptr -> tx_mutex_suspension_list = TX_NULL;
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suspended_count = mutex_ptr -> tx_mutex_suspended_count;
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mutex_ptr -> tx_mutex_suspended_count = TX_NO_SUSPENSIONS;
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/* Determine if the mutex is currently on a thread's ownership list. */
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/* Setup pointer to owner of mutex. */
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owner_thread = mutex_ptr -> tx_mutex_owner;
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/* Determine if there is a valid thread pointer. */
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if (owner_thread != TX_NULL)
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{
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/* Yes, remove this mutex from the owned list. */
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/* Set the ownership count to 1. */
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mutex_ptr -> tx_mutex_ownership_count = ((UINT) 1);
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/* Restore interrupts. */
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TX_RESTORE
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#ifdef TX_MISRA_ENABLE
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/* Release the mutex. */
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do
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{
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status = _tx_mutex_put(mutex_ptr);
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} while (status != TX_SUCCESS);
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#else
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_tx_mutex_put(mutex_ptr);
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#endif
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/* Disable interrupts. */
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TX_DISABLE
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}
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/* Restore interrupts. */
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TX_RESTORE
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/* Walk through the mutex list to resume any and all threads suspended
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on this mutex. */
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while (suspended_count != ((ULONG) 0))
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{
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/* Decrement the suspension count. */
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suspended_count--;
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/* Lockout interrupts. */
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TX_DISABLE
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/* Clear the cleanup pointer, this prevents the timeout from doing
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anything. */
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thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
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/* Set the return status in the thread to TX_DELETED. */
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thread_ptr -> tx_thread_suspend_status = TX_DELETED;
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/* Move the thread pointer ahead. */
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next_thread = thread_ptr -> tx_thread_suspended_next;
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#ifdef TX_NOT_INTERRUPTABLE
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/* Resume the thread! */
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_tx_thread_system_ni_resume(thread_ptr);
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/* Restore interrupts. */
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TX_RESTORE
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#else
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/* Temporarily disable preemption again. */
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_tx_thread_preempt_disable++;
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/* Restore interrupts. */
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TX_RESTORE
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/* Resume the thread. */
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_tx_thread_system_resume(thread_ptr);
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#endif
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/* Move to next thread. */
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thread_ptr = next_thread;
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}
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/* Execute Port-Specific completion processing. If needed, it is typically defined in tx_port.h. */
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TX_MUTEX_DELETE_PORT_COMPLETION(mutex_ptr)
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/* Disable interrupts. */
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TX_DISABLE
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/* Release previous preempt disable. */
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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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/* Return TX_SUCCESS. */
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return(TX_SUCCESS);
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}
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