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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 */
/** */
/** Thread */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
#define TX_THREAD_SMP_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_trace.h"
#include "tx_thread.h"
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_suspend PORTABLE SMP */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function handles application suspend requests. If the suspend */
/* requires actual processing, this function calls the actual suspend */
/* thread routine. */
/* */
/* INPUT */
/* */
/* thread_ptr Pointer to thread to suspend */
/* */
/* OUTPUT */
/* */
/* status Return completion status */
/* */
/* CALLS */
/* */
/* _tx_thread_system_suspend Actual thread suspension */
/* _tx_thread_system_ni_suspend Non-interruptable suspend thread */
/* */
/* CALLED BY */
/* */
/* Application code */
/* */
/**************************************************************************/
UINT _tx_thread_suspend(TX_THREAD *thread_ptr)
{
TX_INTERRUPT_SAVE_AREA
TX_THREAD *current_thread;
UINT status;
UINT core_index;
/* Lockout interrupts while the thread is being suspended. */
TX_DISABLE
/* Pickup thread pointer. */
TX_THREAD_GET_CURRENT(current_thread)
/* If trace is enabled, insert this event into the trace buffer. */
TX_TRACE_IN_LINE_INSERT(TX_TRACE_THREAD_SUSPEND_API, thread_ptr, thread_ptr -> tx_thread_state, TX_POINTER_TO_ULONG_CONVERT(&status), 0, TX_TRACE_THREAD_EVENTS)
/* Log this kernel call. */
TX_EL_THREAD_SUSPEND_INSERT
/* Check the specified thread's current status. */
if (thread_ptr -> tx_thread_state == TX_READY)
{
/* Initialize status to success. */
status = TX_SUCCESS;
/* Pickup the index. */
core_index = TX_SMP_CORE_ID;
/* Determine if we are in a thread context. */
if (_tx_thread_system_state[core_index] == ((ULONG) 0))
{
/* Yes, we are in a thread context. */
/* Determine if the current thread is also the suspending thread. */
if (current_thread == thread_ptr)
{
/* Determine if the preempt disable flag is non-zero. */
if (_tx_thread_preempt_disable != ((UINT) 0))
{
/* Thread is terminated or completed. */
status = TX_SUSPEND_ERROR;
}
}
}
/* Determine if the status is still successful. */
if (status == TX_SUCCESS)
{
/* Set the state to suspended. */
thread_ptr -> tx_thread_state = TX_SUSPENDED;
#ifdef TX_NOT_INTERRUPTABLE
/* Call actual non-interruptable thread suspension routine. */
_tx_thread_system_ni_suspend(thread_ptr, ((ULONG) 0));
/* Restore interrupts. */
TX_RESTORE
#else
/* Set the suspending flag. */
thread_ptr -> tx_thread_suspending = TX_TRUE;
/* Setup for no timeout period. */
thread_ptr -> tx_thread_timer.tx_timer_internal_remaining_ticks = ((ULONG) 0);
/* Temporarily disable preemption. */
_tx_thread_preempt_disable++;
/* Restore interrupts. */
TX_RESTORE
/* Call actual thread suspension routine. */
_tx_thread_system_suspend(thread_ptr);
#endif
#ifdef TX_MISRA_ENABLE
/* Disable interrupts. */
TX_DISABLE
/* Return success. */
status = TX_SUCCESS;
#else
/* If MISRA is not enabled, return directly. */
return(TX_SUCCESS);
#endif
}
}
else if (thread_ptr -> tx_thread_state == TX_TERMINATED)
{
/* Thread is terminated. */
status = TX_SUSPEND_ERROR;
}
else if (thread_ptr -> tx_thread_state == TX_COMPLETED)
{
/* Thread is completed. */
status = TX_SUSPEND_ERROR;
}
else if (thread_ptr -> tx_thread_state == TX_SUSPENDED)
{
/* Already suspended, just set status to success. */
status = TX_SUCCESS;
}
else
{
/* Just set the delayed suspension flag. */
thread_ptr -> tx_thread_delayed_suspend = TX_TRUE;
/* Set status to success. */
status = TX_SUCCESS;
}
/* Restore interrupts. */
TX_RESTORE
/* Always return success, since this function does not perform error
checking. */
return(status);
}
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