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rt-thread/components/pthreads/pthread.c

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/*
* File : pthread.c
* This file is part of RT-Thread RTOS
* COPYRIGHT (C) 2012, RT-Thread Development Team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Change Logs:
* Date Author Notes
*/
#include <pthread.h>
#include <sched.h>
#include "pthread_internal.h"
int pthread_system_init(void)
{
/* initialize clock and time */
clock_time_system_init();
/* initialize key area */
pthread_key_system_init();
/* initialize posix mqueue */
posix_mq_system_init();
/* initialize posix semaphore */
posix_sem_system_init();
return 0;
}
static void _pthread_cleanup(rt_thread_t tid)
{
_pthread_data_t *ptd;
ptd = _pthread_get_data(tid);
/* clear cleanup function */
tid->cleanup = RT_NULL;
if (ptd->attr.detachstate == PTHREAD_CREATE_JOINABLE)
{
rt_sem_release(ptd->joinable_sem);
}
else
{
/* release pthread resource */
pthread_detach(tid);
}
}
static void pthread_entry_stub(void *parameter)
{
_pthread_data_t *ptd;
void *value;
ptd = (_pthread_data_t*)parameter;
/* execute pthread entry */
value = ptd->thread_entry(ptd->thread_parameter);
/* set value */
ptd->return_value = value;
}
int pthread_create(pthread_t *tid,
const pthread_attr_t *attr,
void *(*start) (void *), void *parameter)
{
int result;
void *stack;
char name[RT_NAME_MAX];
static rt_uint16_t pthread_number = 0;
_pthread_data_t *ptd;
/* tid shall be provided */
RT_ASSERT(tid != RT_NULL);
/* allocate posix thread data */
ptd = (_pthread_data_t*)rt_malloc(sizeof(_pthread_data_t));
if (ptd == RT_NULL)
return ENOMEM;
/* clean posix thread data memory */
rt_memset(ptd, 0, sizeof(_pthread_data_t));
ptd->canceled = 0;
ptd->cancelstate = PTHREAD_CANCEL_DISABLE;
ptd->canceltype = PTHREAD_CANCEL_DEFERRED;
ptd->magic = PTHREAD_MAGIC;
if (attr != RT_NULL)
ptd->attr = *attr;
else
{
/* use default attribute */
pthread_attr_init(&ptd->attr);
}
rt_snprintf(name, sizeof(name), "pth%02d", pthread_number ++);
if (ptd->attr.stack_base == 0)
{
stack = (void*)rt_malloc(ptd->attr.stack_size);
}
else
stack = (void*)(ptd->attr.stack_base);
if (stack == RT_NULL)
{
rt_free(ptd);
return ENOMEM;
}
/* pthread is a static thread object */
ptd->tid = (rt_thread_t) rt_malloc(sizeof(struct rt_thread));
if (ptd->tid == RT_NULL)
{
if (ptd->attr.stack_base == 0)
rt_free(stack);
rt_free(ptd);
return ENOMEM;
}
if (ptd->attr.detachstate == PTHREAD_CREATE_JOINABLE)
{
ptd->joinable_sem = rt_sem_create(name, 0, RT_IPC_FLAG_FIFO);
if (ptd->joinable_sem == RT_NULL)
{
if (ptd->attr.stack_base != 0)
rt_free(stack);
rt_free(ptd);
return ENOMEM;
}
}
else
ptd->joinable_sem = RT_NULL;
/* set parameter */
ptd->thread_entry = start;
ptd->thread_parameter = parameter;
/* initial this pthread to system */
if (rt_thread_init(ptd->tid, name, pthread_entry_stub, ptd,
stack, ptd->attr.stack_size,
ptd->attr.priority, 5) != RT_EOK)
{
if (ptd->attr.stack_base == 0)
rt_free(stack);
if (ptd->joinable_sem != RT_NULL)
rt_sem_delete(ptd->joinable_sem);
rt_free(ptd);
return EINVAL;
}
/* set pthread id */
*tid = ptd->tid;
/* set pthread cleanup function and ptd data */
(*tid)->cleanup = _pthread_cleanup;
(*tid)->user_data = (rt_uint32_t)ptd;
/* start thread */
result = rt_thread_startup(*tid);
if (result == RT_EOK)
return 0;
/* start thread failed */
rt_thread_detach(ptd->tid);
if (ptd->attr.stack_base == 0)
rt_free(stack);
if (ptd->joinable_sem != RT_NULL)
rt_sem_delete(ptd->joinable_sem);
rt_free(ptd);
return EINVAL;
}
RTM_EXPORT(pthread_create);
int pthread_detach(pthread_t thread)
{
_pthread_data_t* ptd;
ptd = _pthread_get_data(thread);
if (thread->stat == RT_THREAD_CLOSE)
{
/* delete joinable semaphore */
if (ptd->joinable_sem != RT_NULL)
rt_sem_delete(ptd->joinable_sem);
/* detach thread object */
rt_thread_detach(ptd->tid);
/* release thread resource */
if (ptd->attr.stack_base == RT_NULL)
{
/* release thread allocated stack */
rt_free(ptd->tid->stack_addr);
}
/*
* if this thread create the local thread data,
* delete it
*/
if (ptd->tls != RT_NULL)
rt_free(ptd->tls);
rt_free(ptd->tid);
rt_free(ptd);
}
else
{
rt_enter_critical();
/* change to detach state */
ptd->attr.detachstate = PTHREAD_CREATE_DETACHED;
/* detach joinable semaphore */
rt_sem_delete(ptd->joinable_sem);
ptd->joinable_sem = RT_NULL;
rt_exit_critical();
}
return 0;
}
RTM_EXPORT(pthread_detach);
int pthread_join (pthread_t thread, void **value_ptr)
{
_pthread_data_t* ptd;
rt_err_t result;
if (thread == rt_thread_self())
{
/* join self */
return EDEADLK;
}
ptd = _pthread_get_data(thread);
if (ptd->attr.detachstate == PTHREAD_CREATE_DETACHED)
return EINVAL; /* join on a detached pthread */
result = rt_sem_take(ptd->joinable_sem, RT_WAITING_FOREVER);
if (result == RT_EOK)
{
/* get return value */
if (value_ptr != RT_NULL)
*value_ptr = ptd->return_value;
/* release resource */
pthread_detach(thread);
}
else
return ESRCH;
return 0;
}
RTM_EXPORT(pthread_join);
void pthread_exit (void *value)
{
_pthread_data_t *ptd;
_pthread_cleanup_t *cleanup;
extern _pthread_key_data_t _thread_keys[PTHREAD_KEY_MAX];
ptd = _pthread_get_data(rt_thread_self());
rt_enter_critical();
/* disable cancel */
ptd->cancelstate = PTHREAD_CANCEL_DISABLE;
/* set return value */
ptd->return_value = value;
rt_exit_critical();
/* invoke pushed cleanup */
while (ptd->cleanup != RT_NULL)
{
cleanup = ptd->cleanup;
ptd->cleanup = cleanup->next;
cleanup->cleanup_func(cleanup->parameter);
/* release this cleanup function */
rt_free(cleanup);
}
/* destruct thread local key */
if (ptd->tls != RT_NULL)
{
void *data;
rt_uint32_t index;
for (index = 0; index < PTHREAD_KEY_MAX; index ++)
{
if (_thread_keys[index].is_used)
{
data = ptd->tls[index];
if (data)
_thread_keys[index].destructor(data);
}
}
/* release tls area */
rt_free(ptd->tls);
ptd->tls = RT_NULL;
}
if (ptd->attr.detachstate == PTHREAD_CREATE_JOINABLE)
{
/* release the joinable pthread */
rt_sem_release(ptd->joinable_sem);
}
/* detach thread */
rt_thread_detach(ptd->tid);
/* reschedule thread */
rt_schedule();
}
RTM_EXPORT(pthread_exit);
int pthread_once(pthread_once_t *once_control, void (*init_routine) (void))
{
RT_ASSERT(once_control != RT_NULL);
RT_ASSERT(init_routine != RT_NULL);
rt_enter_critical();
if (!(*once_control))
{
/* call routine once */
*once_control = 1;
rt_exit_critical();
init_routine();
}
rt_exit_critical();
return 0;
}
RTM_EXPORT(pthread_once);
int pthread_atfork(void (*prepare)(void), void (*parent)(void), void (*child)(void))
{
return EOPNOTSUPP;
}
RTM_EXPORT(pthread_atfork);
int pthread_kill(pthread_t thread, int sig)
{
return EOPNOTSUPP;
}
RTM_EXPORT(pthread_kill);
void pthread_cleanup_pop(int execute)
{
_pthread_data_t *ptd;
_pthread_cleanup_t *cleanup;
/* get posix thread data */
ptd = _pthread_get_data(rt_thread_self());
RT_ASSERT(ptd != RT_NULL);
if (execute)
{
rt_enter_critical();
cleanup = ptd->cleanup;
if (cleanup)
ptd->cleanup = cleanup->next;
rt_exit_critical();
if (cleanup)
{
cleanup->cleanup_func(cleanup->parameter);
rt_free(cleanup);
}
}
}
RTM_EXPORT(pthread_cleanup_pop);
void pthread_cleanup_push(void (*routine)(void*), void *arg)
{
_pthread_data_t *ptd;
_pthread_cleanup_t *cleanup;
/* get posix thread data */
ptd = _pthread_get_data(rt_thread_self());
RT_ASSERT(ptd != RT_NULL);
cleanup = (_pthread_cleanup_t *)rt_malloc(sizeof(_pthread_cleanup_t));
if (cleanup != RT_NULL)
{
cleanup->cleanup_func = routine;
cleanup->parameter = arg;
rt_enter_critical();
cleanup->next = ptd->cleanup;
ptd->cleanup = cleanup;
rt_exit_critical();
}
}
RTM_EXPORT(pthread_cleanup_push);
/*
* According to IEEE Std 1003.1, 2004 Edition , following pthreads
* interface support cancellation point:
* mq_receive()
* mq_send()
* mq_timedreceive()
* mq_timedsend()
* msgrcv()
* msgsnd()
* msync()
* pthread_cond_timedwait()
* pthread_cond_wait()
* pthread_join()
* pthread_testcancel()
* sem_timedwait()
* sem_wait()
*
* A cancellation point may also occur when a thread is
* executing the following functions:
* pthread_rwlock_rdlock()
* pthread_rwlock_timedrdlock()
* pthread_rwlock_timedwrlock()
* pthread_rwlock_wrlock()
*
* The pthread_cancel(), pthread_setcancelstate(), and pthread_setcanceltype()
* functions are defined to be async-cancel safe.
*/
int pthread_setcancelstate(int state, int *oldstate)
{
_pthread_data_t *ptd;
/* get posix thread data */
ptd = _pthread_get_data(rt_thread_self());
RT_ASSERT(ptd != RT_NULL);
if ((state == PTHREAD_CANCEL_ENABLE) || (state == PTHREAD_CANCEL_DISABLE))
{
if (oldstate)
*oldstate = ptd->cancelstate;
ptd->cancelstate = state;
return 0;
}
return EINVAL;
}
RTM_EXPORT(pthread_setcancelstate);
int pthread_setcanceltype(int type, int *oldtype)
{
_pthread_data_t *ptd;
/* get posix thread data */
ptd = _pthread_get_data(rt_thread_self());
RT_ASSERT(ptd != RT_NULL);
if ((type != PTHREAD_CANCEL_DEFERRED) && (type != PTHREAD_CANCEL_ASYNCHRONOUS))
return EINVAL;
if (oldtype)
*oldtype = ptd->canceltype;
ptd->canceltype = type;
return 0;
}
RTM_EXPORT(pthread_setcanceltype);
void pthread_testcancel(void)
{
int cancel=0;
_pthread_data_t* ptd;
/* get posix thread data */
ptd = _pthread_get_data(rt_thread_self());
RT_ASSERT(ptd != RT_NULL);
if (ptd->cancelstate == PTHREAD_CANCEL_ENABLE)
cancel = ptd->canceled;
if (cancel)
pthread_exit((void*)PTHREAD_CANCELED);
}
RTM_EXPORT(pthread_testcancel);
int pthread_cancel(pthread_t thread)
{
_pthread_data_t *ptd;
/* cancel self */
if (thread == rt_thread_self())
return 0;
/* get posix thread data */
ptd = _pthread_get_data(thread);
RT_ASSERT(ptd != RT_NULL);
/* set canceled */
if (ptd->cancelstate == PTHREAD_CANCEL_ENABLE)
{
ptd->canceled = 1;
if (ptd->canceltype == PTHREAD_CANCEL_ASYNCHRONOUS)
{
/*
* to detach thread.
* this thread will be removed from scheduler list
* and because there is a cleanup function in the
* thread (pthread_cleanup), it will move to defunct
* thread list and wait for handling in idle thread.
*/
rt_thread_detach(thread);
}
}
return 0;
}
RTM_EXPORT(pthread_cancel);
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