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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_thread.h"
#include "tx_mutex.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_mutex_cleanup PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function processes mutex timeout and thread terminate */
/* actions that require the mutex data structures to be cleaned */
/* up. */
/* */
/* INPUT */
/* */
/* thread_ptr Pointer to suspended thread's */
/* control block */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_thread_system_resume Resume thread service */
/* _tx_thread_system_ni_resume Non-interruptable resume thread */
/* */
/* CALLED BY */
/* */
/* _tx_thread_timeout Thread timeout processing */
/* _tx_thread_terminate Thread terminate processing */
/* _tx_thread_wait_abort Thread wait abort processing */
/* */
/* 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 */
/* */
/**************************************************************************/
VOID _tx_mutex_cleanup(TX_THREAD *thread_ptr, ULONG suspension_sequence)
{
#ifndef TX_NOT_INTERRUPTABLE
TX_INTERRUPT_SAVE_AREA
#endif
TX_MUTEX *mutex_ptr;
UINT suspended_count;
TX_THREAD *next_thread;
TX_THREAD *previous_thread;
#ifndef TX_NOT_INTERRUPTABLE
/* Disable interrupts to remove the suspended thread from the mutex. */
TX_DISABLE
/* Determine if the cleanup is still required. */
if (thread_ptr -> tx_thread_suspend_cleanup == &(_tx_mutex_cleanup))
{
/* Check for valid suspension sequence. */
if (suspension_sequence == thread_ptr -> tx_thread_suspension_sequence)
{
/* Setup pointer to mutex control block. */
mutex_ptr = TX_VOID_TO_MUTEX_POINTER_CONVERT(thread_ptr -> tx_thread_suspend_control_block);
/* Check for NULL mutex pointer. */
if (mutex_ptr != TX_NULL)
{
/* Determine if the mutex ID is valid. */
if (mutex_ptr -> tx_mutex_id == TX_MUTEX_ID)
{
/* Determine if there are any thread suspensions. */
if (mutex_ptr -> tx_mutex_suspended_count != TX_NO_SUSPENSIONS)
{
#else
/* Setup pointer to mutex control block. */
mutex_ptr = TX_VOID_TO_MUTEX_POINTER_CONVERT(thread_ptr -> tx_thread_suspend_control_block);
#endif
/* Yes, we still have thread suspension! */
/* Clear the suspension cleanup flag. */
thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
/* Decrement the suspension count. */
mutex_ptr -> tx_mutex_suspended_count--;
/* Pickup the suspended count. */
suspended_count = mutex_ptr -> tx_mutex_suspended_count;
/* Remove the suspended thread from the list. */
/* See if this is the only suspended thread on the list. */
if (suspended_count == TX_NO_SUSPENSIONS)
{
/* Yes, the only suspended thread. */
/* Update the head pointer. */
mutex_ptr -> tx_mutex_suspension_list = TX_NULL;
}
else
{
/* At least one more thread is on the same suspension list. */
/* Update the links of the adjacent threads. */
next_thread = thread_ptr -> tx_thread_suspended_next;
previous_thread = thread_ptr -> tx_thread_suspended_previous;
next_thread -> tx_thread_suspended_previous = previous_thread;
previous_thread -> tx_thread_suspended_next = next_thread;
/* Determine if we need to update the head pointer. */
if (mutex_ptr -> tx_mutex_suspension_list == thread_ptr)
{
/* Update the list head pointer. */
mutex_ptr -> tx_mutex_suspension_list = next_thread;
}
}
/* Now we need to determine if this cleanup is from a terminate, timeout,
or from a wait abort. */
if (thread_ptr -> tx_thread_state == TX_MUTEX_SUSP)
{
/* Timeout condition and the thread still suspended on the mutex.
Setup return error status and resume the thread. */
#ifdef TX_MUTEX_ENABLE_PERFORMANCE_INFO
/* Increment the total timeouts counter. */
_tx_mutex_performance_timeout_count++;
/* Increment the number of timeouts on this semaphore. */
mutex_ptr -> tx_mutex_performance_timeout_count++;
#endif
/* Setup return status. */
thread_ptr -> tx_thread_suspend_status = TX_NOT_AVAILABLE;
#ifdef TX_NOT_INTERRUPTABLE
/* Resume the thread! */
_tx_thread_system_ni_resume(thread_ptr);
#else
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Resume the thread! */
_tx_thread_system_resume(thread_ptr);
/* Disable interrupts. */
TX_DISABLE
#endif
}
#ifndef TX_NOT_INTERRUPTABLE
}
}
}
}
}
/* Restore interrupts. */
TX_RESTORE
#endif
}
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_mutex_thread_release PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function releases all mutexes owned by the thread. This */
/* function is called when the thread completes or is terminated. */
/* */
/* INPUT */
/* */
/* thread_ptr Pointer to thread's control block */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* _tx_mutex_put Release the mutex */
/* */
/* CALLED BY */
/* */
/* _tx_thread_shell_entry Thread completion processing */
/* _tx_thread_terminate Thread terminate processing */
/* */
/* 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 */
/* */
/**************************************************************************/
VOID _tx_mutex_thread_release(TX_THREAD *thread_ptr)
{
TX_INTERRUPT_SAVE_AREA
TX_MUTEX *mutex_ptr;
#ifdef TX_MISRA_ENABLE
UINT status;
#endif
/* Disable interrupts. */
TX_DISABLE
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Loop to look at all the mutexes. */
do
{
/* Pickup the mutex head pointer. */
mutex_ptr = thread_ptr -> tx_thread_owned_mutex_list;
/* Determine if there is a mutex. */
if (mutex_ptr != TX_NULL)
{
/* Yes, set the ownership count to 1. */
mutex_ptr -> tx_mutex_ownership_count = ((UINT) 1);
/* Restore interrupts. */
TX_RESTORE
#ifdef TX_MISRA_ENABLE
/* Release the mutex. */
do
{
status = _tx_mutex_put(mutex_ptr);
} while (status != TX_SUCCESS);
#else
_tx_mutex_put(mutex_ptr);
#endif
/* Disable interrupts. */
TX_DISABLE
/* Move to the next mutex. */
mutex_ptr = thread_ptr -> tx_thread_owned_mutex_list;
}
} while (mutex_ptr != TX_NULL);
/* Restore preemption. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
}