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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 */
/** */
/** Event Flags */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_thread.h"
#include "tx_timer.h"
#include "tx_event_flags.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _txe_event_flags_get PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function checks for errors in the event flags get function */
/* call. */
/* */
/* INPUT */
/* */
/* group_ptr Pointer to group control block */
/* requested_event_flags Event flags requested */
/* get_option Specifies and/or and clear options*/
/* actual_flags_ptr Pointer to place the actual flags */
/* the service retrieved */
/* wait_option Suspension option */
/* */
/* OUTPUT */
/* */
/* TX_GROUP_ERROR Invalid event flags group pointer */
/* TX_PTR_ERROR Invalid actual flags pointer */
/* TX_WAIT_ERROR Invalid wait option */
/* TX_OPTION_ERROR Invalid get option */
/* TX_CALLER_ERROR Invalid caller of this function */
/* status Actual completion status */
/* */
/* CALLS */
/* */
/* _tx_event_flags_get Actual event flags get function */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/* 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 */
/* */
/**************************************************************************/
UINT _txe_event_flags_get(TX_EVENT_FLAGS_GROUP *group_ptr, ULONG requested_flags,
UINT get_option, ULONG *actual_flags_ptr, ULONG wait_option)
{
UINT status;
#ifndef TX_TIMER_PROCESS_IN_ISR
TX_THREAD *current_thread;
#endif
/* Default status to success. */
status = TX_SUCCESS;
/* Check for an invalid event flag group pointer. */
if (group_ptr == TX_NULL)
{
/* Event flags group pointer is invalid, return appropriate error code. */
status = TX_GROUP_ERROR;
}
/* Now check for invalid event group ID. */
else if (group_ptr -> tx_event_flags_group_id != TX_EVENT_FLAGS_ID)
{
/* Event flags group pointer is invalid, return appropriate error code. */
status = TX_GROUP_ERROR;
}
/* Check for an invalid destination for actual flags. */
else if (actual_flags_ptr == TX_NULL)
{
/* Null destination pointer, return appropriate error. */
status = TX_PTR_ERROR;
}
else
{
/* Check for a wait option error. Only threads are allowed any form of
suspension. */
if (wait_option != TX_NO_WAIT)
{
/* Is the call from an ISR or Initialization? */
if (TX_THREAD_GET_SYSTEM_STATE() != ((ULONG) 0))
{
/* A non-thread is trying to suspend, return appropriate error code. */
status = TX_WAIT_ERROR;
}
#ifndef TX_TIMER_PROCESS_IN_ISR
else
{
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(current_thread)
/* Is the current thread the timer thread? */
if (current_thread == &_tx_timer_thread)
{
/* A non-thread is trying to suspend, return appropriate error code. */
status = TX_WAIT_ERROR;
}
}
#endif
}
}
/* Is everything still okay? */
if (status == TX_SUCCESS)
{
/* Check for invalid get option. */
if (get_option > TX_AND_CLEAR)
{
/* Invalid get events option, return appropriate error. */
status = TX_OPTION_ERROR;
}
}
/* Determine if everything is okay. */
if (status == TX_SUCCESS)
{
/* Call actual event flags get function. */
status = _tx_event_flags_get(group_ptr, requested_flags, get_option, actual_flags_ptr, wait_option);
}
/* Return completion status. */
return(status);
}