318 lines
14 KiB
C
318 lines
14 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_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_cleanup 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 processes mutex timeout and thread terminate */
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/* actions that require the mutex data structures to be cleaned */
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/* up. */
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/* */
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/* INPUT */
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/* */
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/* thread_ptr Pointer to suspended thread's */
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/* control block */
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/* */
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/* OUTPUT */
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/* */
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/* None */
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/* */
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/* CALLS */
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/* */
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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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/* _tx_thread_timeout Thread timeout processing */
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/* _tx_thread_terminate Thread terminate processing */
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/* _tx_thread_wait_abort Thread wait abort processing */
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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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VOID _tx_mutex_cleanup(TX_THREAD *thread_ptr, ULONG suspension_sequence)
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{
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#ifndef TX_NOT_INTERRUPTABLE
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TX_INTERRUPT_SAVE_AREA
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#endif
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TX_MUTEX *mutex_ptr;
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UINT suspended_count;
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TX_THREAD *next_thread;
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TX_THREAD *previous_thread;
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#ifndef TX_NOT_INTERRUPTABLE
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/* Disable interrupts to remove the suspended thread from the mutex. */
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TX_DISABLE
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/* Determine if the cleanup is still required. */
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if (thread_ptr -> tx_thread_suspend_cleanup == &(_tx_mutex_cleanup))
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{
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/* Check for valid suspension sequence. */
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if (suspension_sequence == thread_ptr -> tx_thread_suspension_sequence)
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{
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/* Setup pointer to mutex control block. */
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mutex_ptr = TX_VOID_TO_MUTEX_POINTER_CONVERT(thread_ptr -> tx_thread_suspend_control_block);
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/* Check for NULL mutex pointer. */
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if (mutex_ptr != TX_NULL)
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{
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/* Determine if the mutex ID is valid. */
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if (mutex_ptr -> tx_mutex_id == TX_MUTEX_ID)
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{
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/* Determine if there are any thread suspensions. */
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if (mutex_ptr -> tx_mutex_suspended_count != TX_NO_SUSPENSIONS)
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{
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#else
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/* Setup pointer to mutex control block. */
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mutex_ptr = TX_VOID_TO_MUTEX_POINTER_CONVERT(thread_ptr -> tx_thread_suspend_control_block);
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#endif
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/* Yes, we still have thread suspension! */
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/* Clear the suspension cleanup flag. */
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thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
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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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/* Remove the suspended thread from the list. */
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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 suspension list. */
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/* Update the links of the adjacent threads. */
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next_thread = thread_ptr -> tx_thread_suspended_next;
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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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/* Determine if we need to update the head pointer. */
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if (mutex_ptr -> tx_mutex_suspension_list == thread_ptr)
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{
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/* Update the list head pointer. */
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mutex_ptr -> tx_mutex_suspension_list = next_thread;
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}
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}
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/* Now we need to determine if this cleanup is from a terminate, timeout,
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or from a wait abort. */
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if (thread_ptr -> tx_thread_state == TX_MUTEX_SUSP)
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{
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/* Timeout condition and the thread still suspended on the mutex.
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Setup return error status and resume the thread. */
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#ifdef TX_MUTEX_ENABLE_PERFORMANCE_INFO
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/* Increment the total timeouts counter. */
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_tx_mutex_performance_timeout_count++;
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/* Increment the number of timeouts on this semaphore. */
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mutex_ptr -> tx_mutex_performance_timeout_count++;
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#endif
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/* Setup return status. */
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thread_ptr -> tx_thread_suspend_status = TX_NOT_AVAILABLE;
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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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#else
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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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/* Resume the thread! */
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_tx_thread_system_resume(thread_ptr);
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/* Disable interrupts. */
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TX_DISABLE
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#endif
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}
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#ifndef TX_NOT_INTERRUPTABLE
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}
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}
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}
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}
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}
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/* Restore interrupts. */
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TX_RESTORE
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#endif
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}
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/**************************************************************************/
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/* */
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/* FUNCTION RELEASE */
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/* */
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/* _tx_mutex_thread_release 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 releases all mutexes owned by the thread. This */
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/* function is called when the thread completes or is terminated. */
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/* */
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/* INPUT */
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/* */
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/* thread_ptr Pointer to thread's control block */
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/* */
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/* OUTPUT */
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/* */
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/* None */
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/* */
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/* CALLS */
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/* */
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/* _tx_mutex_put Release the mutex */
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/* */
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/* CALLED BY */
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/* */
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/* _tx_thread_shell_entry Thread completion processing */
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/* _tx_thread_terminate Thread terminate processing */
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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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VOID _tx_mutex_thread_release(TX_THREAD *thread_ptr)
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{
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TX_INTERRUPT_SAVE_AREA
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TX_MUTEX *mutex_ptr;
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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. */
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TX_DISABLE
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/* Temporarily disable preemption. */
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_tx_thread_preempt_disable++;
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/* Loop to look at all the mutexes. */
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do
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{
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/* Pickup the mutex head pointer. */
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mutex_ptr = thread_ptr -> tx_thread_owned_mutex_list;
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/* Determine if there is a mutex. */
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if (mutex_ptr != TX_NULL)
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{
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/* Yes, 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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/* Move to the next mutex. */
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mutex_ptr = thread_ptr -> tx_thread_owned_mutex_list;
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}
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} while (mutex_ptr != TX_NULL);
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/* Restore 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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}
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