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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
**************************************************************************/
/**************************************************************************/
/**************************************************************************/
/** */
/** POSIX wrapper for THREADX */
/** */
/** */
/** */
/**************************************************************************/
/**************************************************************************/
/* Include necessary system files. */
#include "tx_api.h" /* Threadx API */
#include "pthread.h" /* Posix API */
#include "px_int.h" /* Posix helper functions */
#include "tx_thread.h" /* Internal ThreadX thread management. */
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* internal_signal_dispatch PORTABLE C */
/* 6.1.7 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* Signal handler thread. */
/* */
/* INPUT */
/* */
/* id Signal */
/* */
/* OUTPUT */
/* */
/* none */
/* */
/* CALLS */
/* */
/* posix_internal_error Generic error Handler */
/* tx_thread_identify */
/* tx_event_flags_set */
/* tx_thread_resume */
/* posix_destroy_pthread */
/* tx_thread_suspend */
/* */
/* CALLED BY */
/* */
/* Internal Code */
/* */
/**************************************************************************/
void internal_signal_dispatch(ULONG id)
{
TX_INTERRUPT_SAVE_AREA
POSIX_TCB *signal_thread;
POSIX_TCB *target_thread;
VOID (*handler)(int);
/* Determine if the desired signal is valid. */
if (id > SIGRTMAX)
{
/* System error! */
posix_internal_error(444);
return;
}
/* Pickup signal thread. */
signal_thread = (POSIX_TCB *) tx_thread_identify();
/* Is it non-NULL? */
if (!signal_thread)
{
/* System error! */
posix_internal_error(444);
return;
}
/* Pickup target thread. */
target_thread = signal_thread -> signals.base_thread_ptr;
/* Pickup signal handler function pointer. */
handler = target_thread -> signals.signal_func[id];
/* See if there is a signal handler setup for this signal. */
if (handler)
{
/* Yes, there is a signal handler - call it! */
(handler)((int) id);
}
/* Set the event flag corresponding the signal. */
tx_event_flags_set(&(target_thread -> signals.signal_event_flags), (((ULONG) 1) << id), TX_OR);
/* Ensure the flag is left in a clear state. */
tx_event_flags_set(&(target_thread -> signals.signal_event_flags), ~(((ULONG) 1) << id), TX_AND);
/* Now we need to clear this signal and terminate this signal handler thread. */
/* Disable interrupts. */
TX_DISABLE
/* Clear this signal from the pending list. */
target_thread -> signals.signal_pending.signal_set = target_thread -> signals.signal_pending.signal_set & ~(((unsigned long) 1) << id);
/* Decrement the signal nesting count. */
target_thread -> signals.signal_nesting_depth--;
/* Is this the last nested signal leaving? */
if (target_thread -> signals.signal_nesting_depth == 0)
{
/* Clear the top signal thread link and resume the target thread. */
target_thread -> signals.top_signal_thread = NULL;
/* Restore interrupts. */
TX_RESTORE
/* Resume the target thread. */
tx_thread_resume((TX_THREAD *) target_thread);
}
else
{
/* Otherwise, there are more signal threads still active. */
/* Setup the new top signal thread pointer. */
target_thread -> signals.top_signal_thread = signal_thread -> signals.next_signal_thread;
/* Restore interrupts. */
TX_RESTORE
/* Resume the signal handler thread. */
tx_thread_resume((TX_THREAD *) signal_thread -> signals.next_signal_thread);
}
/* Now we need to mark this signal thread for destruction. */
posix_destroy_pthread(signal_thread,(VOID *) 0);
/* Self-suspend the current signal thread. */
tx_thread_suspend((TX_THREAD *) signal_thread);
}
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