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/***************************************************************************
* Copyright (c) 2024 Microsoft Corporation
* Copyright (c) 2026-present Eclipse ThreadX contributors
*
* This program and the accompanying materials are made available under the
* terms of the MIT License which is available at
* https://opensource.org/licenses/MIT.
*
* SPDX-License-Identifier: MIT
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Event Flags */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_trace.h"
#include "tx_thread.h"
#include "tx_event_flags.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_event_flags_delete PORTABLE C */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function deletes the specified event flag group. All threads */
/* suspended on the group are resumed with the TX_DELETED status */
/* code. */
/* */
/* INPUT */
/* */
/* group_ptr Pointer to group control block */
/* */
/* OUTPUT */
/* */
/* TX_SUCCESS Successful completion status */
/* */
/* CALLS */
/* */
/* _tx_thread_system_preempt_check Check for preemption */
/* _tx_thread_system_resume Resume thread service */
/* _tx_thread_system_ni_resume Non-interruptable resume thread */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
UINT _tx_event_flags_delete(TX_EVENT_FLAGS_GROUP *group_ptr)
{
TX_INTERRUPT_SAVE_AREA
TX_THREAD *thread_ptr;
TX_THREAD *next_thread;
UINT suspended_count;
TX_EVENT_FLAGS_GROUP *next_group;
TX_EVENT_FLAGS_GROUP *previous_group;
/* Disable interrupts to remove the group from the created list. */
TX_DISABLE
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_EVENT_FLAGS_DELETE, group_ptr, TX_POINTER_TO_ULONG_CONVERT(&thread_ptr), 0, 0, TX_TRACE_EVENT_FLAGS_EVENTS)
/* Optional event flags group delete extended processing. */
TX_EVENT_FLAGS_GROUP_DELETE_EXTENSION(group_ptr)
/* If trace is enabled, unregister this object. */
TX_TRACE_OBJECT_UNREGISTER(group_ptr)
/* Log this kernel call. */
TX_EL_EVENT_FLAGS_DELETE_INSERT
/* Clear the event flag group ID to make it invalid. */
group_ptr -> tx_event_flags_group_id = TX_CLEAR_ID;
/* Decrement the number of created event flag groups. */
_tx_event_flags_created_count--;
/* See if this group is the only one on the list. */
if (_tx_event_flags_created_count == TX_EMPTY)
{
/* Only created event flag group, just set the created list to NULL. */
_tx_event_flags_created_ptr = TX_NULL;
}
else
{
/* Link-up the neighbors. */
next_group = group_ptr -> tx_event_flags_group_created_next;
previous_group = group_ptr -> tx_event_flags_group_created_previous;
next_group -> tx_event_flags_group_created_previous = previous_group;
previous_group -> tx_event_flags_group_created_next = next_group;
/* See if we have to update the created list head pointer. */
if (_tx_event_flags_created_ptr == group_ptr)
{
/* Yes, move the head pointer to the next link. */
_tx_event_flags_created_ptr = next_group;
}
}
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Pickup the suspension information. */
thread_ptr = group_ptr -> tx_event_flags_group_suspension_list;
group_ptr -> tx_event_flags_group_suspension_list = TX_NULL;
suspended_count = group_ptr -> tx_event_flags_group_suspended_count;
group_ptr -> tx_event_flags_group_suspended_count = TX_NO_SUSPENSIONS;
/* Restore interrupts. */
TX_RESTORE
/* Walk through the event flag suspension list to resume any and all threads
suspended on this group. */
while (suspended_count != TX_NO_SUSPENSIONS)
{
/* Decrement the number of suspended threads. */
suspended_count--;
/* Lockout interrupts. */
TX_DISABLE
/* Clear the cleanup pointer, this prevents the timeout from doing
anything. */
thread_ptr -> tx_thread_suspend_cleanup = TX_NULL;
/* Set the return status in the thread to TX_DELETED. */
thread_ptr -> tx_thread_suspend_status = TX_DELETED;
/* Move the thread pointer ahead. */
next_thread = thread_ptr -> tx_thread_suspended_next;
#ifdef TX_NOT_INTERRUPTABLE
/* Resume the thread! */
_tx_thread_system_ni_resume(thread_ptr);
/* Restore interrupts. */
TX_RESTORE
#else
/* Temporarily disable preemption again. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Resume the thread. */
_tx_thread_system_resume(thread_ptr);
#endif
/* Move to next thread. */
thread_ptr = next_thread;
}
/* Execute Port-Specific completion processing. If needed, it is typically defined in tx_port.h. */
TX_EVENT_FLAGS_GROUP_DELETE_PORT_COMPLETION(group_ptr)
/* Disable interrupts. */
TX_DISABLE
/* Release previous preempt disable. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Check for preemption. */
_tx_thread_system_preempt_check();
/* Return TX_SUCCESS. */
return(TX_SUCCESS);
}
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