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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
**************************************************************************/
// Portions of this file were generated with AI assistance.
/**************************************************************************/
/**************************************************************************/
/** */
/** ThreadX Component */
/** */
/** Thread */
/** */
/**************************************************************************/
/**************************************************************************/
#define TX_SOURCE_CODE
/* Include necessary system files. */
#include "tx_api.h"
#include "tx_thread.h"
#include "tx_timer.h"
#include <stdio.h>
#include <errno.h>
extern sem_t _tx_linux_timer_semaphore;
extern sem_t _tx_linux_isr_semaphore;
extern UINT _tx_linux_timer_waiting;
extern pthread_t _tx_linux_timer_id;
/**************************************************************************/
/* */
/* FUNCTION RELEASE */
/* */
/* _tx_thread_schedule Linux/GNU */
/* 6.1 */
/* AUTHOR */
/* */
/* William E. Lamie, Microsoft Corporation */
/* */
/* DESCRIPTION */
/* */
/* This function waits for a thread control block pointer to appear in */
/* the _tx_thread_execute_ptr variable. Once a thread pointer appears */
/* in the variable, the corresponding thread is resumed. */
/* */
/* INPUT */
/* */
/* None */
/* */
/* OUTPUT */
/* */
/* None */
/* */
/* CALLS */
/* */
/* tx_linux_mutex_lock */
/* tx_linux_mutex_unlock */
/* _tx_linux_debug_entry_insert */
/* _tx_linux_thread_resume */
/* tx_linux_sem_post */
/* sem_trywait */
/* tx_linux_sem_wait */
/* */
/* CALLED BY */
/* */
/* _tx_initialize_kernel_enter ThreadX entry function */
/* */
/**************************************************************************/
VOID _tx_thread_schedule(VOID)
{
struct timespec ts;
/* Set timer. */
ts.tv_sec = 0;
ts.tv_nsec = 200000;
/* Loop forever. */
while(1)
{
/* Wait for a thread to execute and all ISRs to complete. */
while(1)
{
/* Lock Linux mutex. */
tx_linux_mutex_lock(_tx_linux_mutex);
/* Determine if there is a thread ready to execute AND all ISRs
are complete. */
if ((_tx_thread_execute_ptr != TX_NULL) && (_tx_thread_system_state == 0))
{
/* Get out of this loop and schedule the thread! */
break;
}
else
{
/* Unlock linux mutex. */
tx_linux_mutex_unlock(_tx_linux_mutex);
/* Don't waste all the processor time here in the master thread... */
#ifdef TX_LINUX_NO_IDLE_ENABLE
while(!sem_trywait(&_tx_linux_timer_semaphore));
tx_linux_sem_post(&_tx_linux_timer_semaphore);
/*nanosleep(&ts, &ts);*/
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_nsec += 200000;
if (ts.tv_nsec > 1000000000)
{
ts.tv_nsec -= 1000000000;
ts.tv_sec++;
}
sem_timedwait(&_tx_linux_semaphore_no_idle, &ts);
#else
nanosleep(&ts, &ts);
#endif /* TX_LINUX_NO_IDLE_ENABLE */
}
}
/* Yes! We have a thread to execute. Note that the critical section is already
active from the scheduling loop above. */
/* Setup the current thread pointer. */
_tx_thread_current_ptr = _tx_thread_execute_ptr;
/* Increment the run count for this thread. */
_tx_thread_current_ptr -> tx_thread_run_count++;
/* Setup time-slice, if present. */
_tx_timer_time_slice = _tx_thread_current_ptr -> tx_thread_time_slice;
/* Determine how the thread was suspended. */
if (_tx_thread_current_ptr -> tx_thread_linux_suspension_type)
{
/* Debug entry. */
_tx_linux_debug_entry_insert("SCHEDULE-resume_thread", __FILE__, __LINE__);
/* Pseudo interrupt suspension. The thread is not waiting on
its run semaphore. */
_tx_linux_thread_resume(_tx_thread_current_ptr -> tx_thread_linux_thread_id);
}
else
{
/* Debug entry. */
_tx_linux_debug_entry_insert("SCHEDULE-release_sem", __FILE__, __LINE__);
/* Make sure semaphore is 0. */
while(!sem_trywait(&_tx_thread_current_ptr -> tx_thread_linux_thread_run_semaphore));
/* Let the thread run again by releasing its run semaphore. */
tx_linux_sem_post(&_tx_thread_current_ptr -> tx_thread_linux_thread_run_semaphore);
/* Block timer ISR. */
if(_tx_linux_timer_waiting)
{
/* It is woken up by timer ISR. */
/* Let ThreadX thread wake up first. */
tx_linux_sem_wait(&_tx_linux_semaphore);
/* Wake up timer ISR. */
tx_linux_sem_post_nolock(&_tx_linux_isr_semaphore);
}
else
{
/* It is woken up by TX_THREAD. */
/* Suspend timer thread and let ThreadX thread wake up first. */
_tx_linux_thread_suspend(_tx_linux_timer_id);
tx_linux_sem_wait(&_tx_linux_semaphore);
_tx_linux_thread_resume(_tx_linux_timer_id);
}
}
/* Unlock linux mutex. */
tx_linux_mutex_unlock(_tx_linux_mutex);
/* Debug entry. */
_tx_linux_debug_entry_insert("SCHEDULE-self_suspend_sem", __FILE__, __LINE__);
/* Now suspend the main thread so the application thread can run. */
tx_linux_sem_wait(&_tx_linux_semaphore);
/* Debug entry. */
_tx_linux_debug_entry_insert("SCHEDULE-wake_up", __FILE__, __LINE__);
}
}
/* Define the ThreadX Linux mutex lock function. The wait is timed and retried
rather than left to pthread_mutex_lock, because a thread can be signalled into
the port's suspend handler while it is parked on this mutex. That handler does
not return until the thread is resumed, so the wake-up the next unlock sends is
delivered to a thread that never retries and is lost. Any other thread parked
on the mutex then waits on a mutex that is free. Retrying on a timeout costs
nothing when the mutex is handed over normally, and turns that lost wake-up into
a delay of at most the retry period. */
void _tx_linux_mutex_lock_retry(pthread_mutex_t *mutex)
{
INT linux_status;
struct timespec ts;
do
{
/* Set the deadline for this attempt. */
clock_gettime(CLOCK_REALTIME, &ts);
ts.tv_nsec = ts.tv_nsec + TX_LINUX_MUTEX_RETRY_NSEC;
if (ts.tv_nsec >= 1000000000)
{
ts.tv_nsec = ts.tv_nsec - 1000000000;
ts.tv_sec++;
}
linux_status = pthread_mutex_timedlock(mutex, &ts);
/* Anything but the deadline expiring is a real failure to obtain the
mutex, so stop retrying. */
if ((linux_status != 0) && (linux_status != ETIMEDOUT))
{
break;
}
} while (linux_status != 0);
}
void _tx_thread_delete_port_completion(TX_THREAD *thread_ptr, UINT tx_saved_posture)
{
INT linux_status;
sem_t *threadrunsemaphore;
pthread_t thread_id;
struct timespec ts;
thread_id = thread_ptr -> tx_thread_linux_thread_id;
threadrunsemaphore = &(thread_ptr -> tx_thread_linux_thread_run_semaphore);
ts.tv_sec = 0;
ts.tv_nsec = 1000000;
TX_RESTORE
do
{
linux_status = pthread_cancel(thread_id);
if(linux_status != EAGAIN)
{
break;
}
_tx_linux_thread_resume(thread_id);
tx_linux_sem_post(threadrunsemaphore);
nanosleep(&ts, &ts);
} while (1);
pthread_join(thread_id, NULL);
sem_destroy(threadrunsemaphore);
TX_DISABLE
}
void _tx_thread_reset_port_completion(TX_THREAD *thread_ptr, UINT tx_saved_posture)
{
INT linux_status;
sem_t *threadrunsemaphore;
pthread_t thread_id;
struct timespec ts;
thread_id = thread_ptr -> tx_thread_linux_thread_id;
threadrunsemaphore = &(thread_ptr -> tx_thread_linux_thread_run_semaphore);
ts.tv_sec = 0;
ts.tv_nsec = 1000000;
TX_RESTORE
do
{
linux_status = pthread_cancel(thread_id);
if(linux_status != EAGAIN)
{
break;
}
_tx_linux_thread_resume(thread_id);
tx_linux_sem_post(threadrunsemaphore);
nanosleep(&ts, &ts);
} while (1);
pthread_join(thread_id, NULL);
sem_destroy(threadrunsemaphore);
TX_DISABLE
}
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