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PProvost
183
ports/linux/gnu/src/tx_thread_interrupt_control.c
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183
ports/linux/gnu/src/tx_thread_interrupt_control.c
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/**************************************************************************/
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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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/** Thread */
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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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/* Define small routines used for the TX_DISABLE/TX_RESTORE macros. */
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UINT _tx_thread_interrupt_disable(void)
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{
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UINT previous_value;
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previous_value = _tx_thread_interrupt_control(TX_INT_DISABLE);
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return(previous_value);
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}
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VOID _tx_thread_interrupt_restore(UINT previous_posture)
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{
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previous_posture = _tx_thread_interrupt_control(previous_posture);
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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_thread_interrupt_control Linux/GNU */
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/* 6.0 */
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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 is responsible for changing the interrupt lockout */
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/* posture of the system. */
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/* */
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/* INPUT */
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/* */
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/* new_posture New interrupt lockout posture */
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/* */
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/* OUTPUT */
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/* */
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/* old_posture Old interrupt lockout posture */
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/* */
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/* CALLS */
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/* */
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/* tx_linux_mutex_lock */
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/* pthread_self */
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/* pthread_getschedparam */
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/* tx_linux_mutex_recursive_unlock */
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/* pthread_exit */
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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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/* */
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/**************************************************************************/
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UINT _tx_thread_interrupt_control(UINT new_posture)
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{
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UINT old_posture;
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TX_THREAD *thread_ptr;
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pthread_t thread_id;
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int exit_code = 0;
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/* Lock Linux mutex. */
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tx_linux_mutex_lock(_tx_linux_mutex);
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/* Pickup the id of the current thread. */
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thread_id = pthread_self();
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/* Pickup the current thread pointer. */
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thread_ptr = _tx_thread_current_ptr;
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/* Determine if this is a thread and it does not
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match the current thread pointer. */
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if ((_tx_linux_threadx_thread) &&
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((!thread_ptr) || (!pthread_equal(thread_ptr -> tx_thread_linux_thread_id, thread_id))))
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{
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/* This indicates the Linux thread was actually terminated by ThreadX is only
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being allowed to run in order to cleanup its resources. */
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/* Unlock linux mutex. */
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tx_linux_mutex_recursive_unlock(_tx_linux_mutex);
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pthread_exit((void *)&exit_code);
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}
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/* Determine the current interrupt lockout condition. */
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if (tx_linux_mutex_recursive_count == 1)
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{
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/* Interrupts are enabled. */
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old_posture = TX_INT_ENABLE;
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}
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else
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{
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/* Interrupts are disabled. */
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old_posture = TX_INT_DISABLE;
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}
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/* First, determine if this call is from a non-thread. */
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if (_tx_thread_system_state)
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{
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/* Determine how to apply the new posture. */
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if (new_posture == TX_INT_ENABLE)
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{
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/* Clear the disabled flag. */
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_tx_linux_global_int_disabled_flag = TX_FALSE;
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/* Determine if the critical section is locked. */
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tx_linux_mutex_recursive_unlock(_tx_linux_mutex);
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}
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else if (new_posture == TX_INT_DISABLE)
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{
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/* Set the disabled flag. */
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_tx_linux_global_int_disabled_flag = TX_TRUE;
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}
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}
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else if (thread_ptr)
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{
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/* Determine how to apply the new posture. */
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if (new_posture == TX_INT_ENABLE)
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{
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/* Clear the disabled flag. */
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_tx_thread_current_ptr -> tx_thread_linux_int_disabled_flag = TX_FALSE;
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/* Determine if the critical section is locked. */
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tx_linux_mutex_recursive_unlock(_tx_linux_mutex);
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}
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else if (new_posture == TX_INT_DISABLE)
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{
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/* Set the disabled flag. */
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_tx_thread_current_ptr -> tx_thread_linux_int_disabled_flag = TX_TRUE;
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}
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}
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/* Return the previous interrupt disable posture. */
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return(old_posture);
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}
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