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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 */
/* */
/* pthread_kill PORTABLE C */
/* 6.2.0 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function is used to request that a signal be delivered to */
/* the specified thread. */
/* */
/* INPUT */
/* */
/* thread_id Thread ID */
/* sig Signal */
/* */
/* OUTPUT */
/* */
/* 0 if successful */
/* Value in case of any error */
/* */
/* CALLS */
/* */
/* posix_in_thread_context Make sure caller is thread */
/* posix_internal_error Generic error Handler */
/* tx_event_flags_set */
/* posix_memory_allocate Create a byte pool for stack */
/* tx_thread_create */
/* tx_event_flags_delete */
/* posix_memory_release */
/* tx_thread_suspend */
/* _tx_thread_system_preempt_check */
/* */
/* CALLED BY */
/* */
/* Application Code */
/* */
/**************************************************************************/
int pthread_kill(ALIGN_TYPE thread_id, int sig)
{
TX_INTERRUPT_SAVE_AREA
POSIX_TCB *target_thread;
POSIX_TCB *new_signal_thread;
VOID (*handler)(int);
INT status;
UINT retval;
/* Make sure we're calling this routine from a thread context. */
if (!posix_in_thread_context())
{
/* return POSIX error. */
posix_internal_error(444);
return(ERROR);
}
/* Determine if the desired signal is valid. */
if ((sig < 0) || (sig > SIGRTMAX))
{
/* Return an error. */
posix_set_pthread_errno(EINVAL);
return(ERROR);
}
/* Pickup target thread. */
target_thread = (POSIX_TCB *) thread_id;
/* Is it non-NULL? */
if (!target_thread)
{
/* Invalid target pthread object */
posix_errno= ESRCH;
posix_set_pthread_errno(ESRCH);
return(ERROR);
}
/* Pickup signal handler function pointer. */
handler = target_thread -> signals.signal_func[sig];
/* See if there is a signal handler setup for this signal. */
if (!handler)
{
/* No handler, just set/clear the event flags to handle the sigwait condition. */
/* Set the event flag corresponding the signal. */
tx_event_flags_set(&(target_thread -> signals.signal_event_flags), (((ULONG) 1) << sig), TX_OR);
/* Ensure the flag is left in a clear state. */
tx_event_flags_set(&(target_thread -> signals.signal_event_flags), ~(((ULONG) 1) << sig), TX_AND);
/* We are done, just return success. */
return(OK);
}
/* Now, let's look to see if the same signal is already pending. */
if (target_thread -> signals.signal_pending.signal_set & (((unsigned long) 1) << sig))
{
/* Yes, the same signal is already pending, just return. */
return(OK);
}
/* Now determine if the thread's signals are masked by pthread_sigmask. */
if (target_thread -> signals.signal_mask.signal_set & (((unsigned long) 1) << sig))
{
/* Yes, simply set the pending bit so we know that the signal must be activated later when the
signal mask for this signal is cleared. */
target_thread -> signals.signal_pending.signal_set = target_thread -> signals.signal_pending.signal_set | (((unsigned long) 1) << sig);
return(OK);
}
/* At this point we know that we need to create a new signal handler thread for processing this signal. */
/* Get a pthread control block for this new signal pthread */
/* Disable interrupts for protection. */
TX_DISABLE
/* Disable preemption temporarily. */
_tx_thread_preempt_disable++;
/* Allocate a POSIX thread control block. */
status = posix_allocate_pthread_t(&new_signal_thread);
/* Restore interrupts. */
TX_RESTORE
/* Make sure we got a new thread control block */
if ((status == ERROR) || (!new_signal_thread))
{
/* Disable interrupts. */
TX_DISABLE
/* Enable preemption. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Configuration/resource error. */
posix_set_pthread_errno(EAGAIN);
return(ERROR);
}
/* Inherit the stack size for the new signal thread. */
new_signal_thread -> stack_size = target_thread -> stack_size ;
/* Allocate memory for stack. */
status = posix_memory_allocate(new_signal_thread -> stack_size, &new_signal_thread -> stack_address);
/* problem allocating stack space */
if (status == ERROR)
{
/* Mark the previously allocated control block as available. */
new_signal_thread -> in_use = FALSE;
/* Disable interrupts. */
TX_DISABLE
/* Enable preemption. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Configuration/resource error. */
posix_set_pthread_errno(EAGAIN);
return(ERROR);
}
/* Inherit scheduling attributes from base thread. */
new_signal_thread -> current_priority = target_thread -> current_priority ;
new_signal_thread -> detach_state = target_thread -> detach_state ;
new_signal_thread -> inherit_sched = target_thread -> inherit_sched ;
new_signal_thread -> orig_priority = target_thread -> orig_priority ;
new_signal_thread -> sched_attr.sched_priority= target_thread -> sched_attr.sched_priority ;
new_signal_thread -> pthread_flags = target_thread -> pthread_flags ;
new_signal_thread -> sched_policy = target_thread -> sched_policy;
new_signal_thread -> is_joined_by = TX_FALSE;
new_signal_thread -> joined_by_pthreadID = TX_FALSE;
new_signal_thread -> is_joined_to = TX_FALSE;
new_signal_thread -> joined_to_pthreadID = TX_FALSE;
new_signal_thread -> cancel_state = PTHREAD_CANCEL_ENABLE;
new_signal_thread -> cancel_type = PTHREAD_CANCEL_DEFERRED;
new_signal_thread -> cancel_request = FALSE;
new_signal_thread -> value_ptr = NULL;
/* Increment the target thread's signal nesting depth. */
target_thread -> signals.signal_nesting_depth++;
/* Mark this signal as pending in the signal set. */
target_thread -> signals.signal_pending.signal_set = target_thread -> signals.signal_pending.signal_set | (((unsigned long) 1) << sig);
/* Mark the new thread as a signal thread, clear signal info, and setup links. */
new_signal_thread -> signals.signal_handler = TRUE;
new_signal_thread -> signals.signal_nesting_depth = target_thread -> signals.signal_nesting_depth;
new_signal_thread -> signals.signal_pending.signal_set = target_thread -> signals.signal_pending.signal_set;
new_signal_thread -> signals.saved_thread_state = ((TX_THREAD *) target_thread) -> tx_thread_state;
new_signal_thread -> signals.base_thread_ptr = target_thread;
new_signal_thread -> signals.next_signal_thread = target_thread -> signals.top_signal_thread;
/* Remember the top signal thread in the base thread. */
target_thread -> signals.top_signal_thread = new_signal_thread;
/* Now actually create and start the signal thread. */
retval = tx_thread_create( (TX_THREAD *) new_signal_thread,
"signal pthr",
internal_signal_dispatch,
(ULONG) sig,
new_signal_thread -> stack_address,
new_signal_thread -> stack_size,
(TX_LOWEST_PRIORITY - new_signal_thread -> current_priority + 1),
(TX_LOWEST_PRIORITY - new_signal_thread -> current_priority + 1),
new_signal_thread -> time_slice,
TX_AUTO_START);
/* See if ThreadX encountered an error */
if (retval)
{
/* Create an event flags group. */
tx_event_flags_delete(&(new_signal_thread -> signals.signal_event_flags));
/* Release the stack memory. */
posix_memory_release(new_signal_thread -> stack_address);
/* Mark the previously allocated control block as available. */
new_signal_thread -> in_use = FALSE;
/* Disable interrupts. */
TX_DISABLE
/* Enable preemption. */
_tx_thread_preempt_disable--;
/* Restore interrupts. */
TX_RESTORE
/* Internal error */
posix_error_handler(3333);
posix_set_pthread_errno(EACCES);
return(ERROR);
}
/* Disable interrupts. */
TX_DISABLE
/* Enable preemption. */
_tx_thread_preempt_disable--;
/* At this point, we need to suspend the target thread if we are the first signal handler to run. */
if (new_signal_thread -> signals.signal_nesting_depth == 1)
{
/* Restore interrupts. */
TX_RESTORE
/* Suspend the base thread so that it doesn't run again until all the signals have been processed. */
tx_thread_suspend((TX_THREAD *) target_thread);
}
else if (new_signal_thread -> signals.next_signal_thread)
{
/* Restore interrupts. */
TX_RESTORE
/* Make sure the current top level signal handler thread is suspended. */
tx_thread_suspend((TX_THREAD *) new_signal_thread -> signals.next_signal_thread);
}
/* At this point, the new signal has been set and the signal handler is ready for execution. */
/* Check for a preemption condition. */
_tx_thread_system_preempt_check();
/* Return success! */
return(OK);
}
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