317 lines
8.4 KiB
C
317 lines
8.4 KiB
C
/****************************************************************************
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* include/threads.h
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*
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* Copyright (C) 2014 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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#ifndef __INCLUDE_THREADS_H
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#define __INCLUDE_THREADS_H
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <sys/types.h>
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#include <pthread.h>
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#include <time.h>
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#include <errno.h>
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/****************************************************************************
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* Pre-processor Definitions
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****************************************************************************/
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/* Indicates thread error status */
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#define thrd_success ((FAR void *)OK)
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#define thrd_timedout ((FAR void *)ETIMEDOUT)
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#define thrd_busy ((FAR void *)EBUSY)
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#define thrd_nomem ((FAR void *)ENOMEM)
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#define thrd_error ((FAR void *)ERROR)
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/* Defines the type of a mutex */
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#define mtx_plain 0
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#define mtx_recursive 1
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#define mtx_timed 2
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/* ONCE_FLAG_INIT: initializes a once_flag */
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#define ONCE_FLAG_INIT PTHREAD_ONCE_INIT
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/* thread_local: thread local type macro */
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//#define thread_local _Thread_local
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#define thread_local NOTIMPLEMENTED
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/* tss_t: thread-specific storage pointer */
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#define tss_t pthread_key_t
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/* TSS_DTOR_ITERATIONS: maximum number of times destructors are called */
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/****************************************************************************
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* Public Type Definitions
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****************************************************************************/
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/* thrd_t: a type identifying a thread */
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#define thrd_t pthread_t
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/* thrd_start_t: function pointer type passed to thrd_create */
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typedef CODE int (*thrd_start_t)(FAR void *arg)
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/* mtx_t : mutex identifier */
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#define pthread_mutex_t
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/* once_flag: the type of the flag used by call_once */
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#define pthread_once_t once_flag
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/* cnd_t: condition variable identifier */
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#define cnd_t pthread_cond_t
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/* tss_dtor_t: function pointer type used for TSS destructor */
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typedef CODE void (*tss_dtor_t)(FAR void *);
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/****************************************************************************
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* Public Function Prototypes
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****************************************************************************/
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/* Threads ******************************************************************/
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/* thrd_create: creates a thread
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*
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* int thrd_create(FAR thrd_t *thr, thrd_start_t func, FAR void *arg);
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*/
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#define thrd_create(thr,func,arg) \
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pthread_create(thr,NULL,(pthread_startroutine_t)func,arg)
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/* thrd_equal: checks if two identifiers refer to the same thread
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*
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* int thrd_equal(thrd_t lhs, thrd_t rhs);
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*/
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#define thrd_equal(lhs,rhs) (lhs == rhs)
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/* thrd_current: obtains the current thread identifier
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*
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* thrd_t thrd_current(void);
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*/
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#define thrd_current() ((thrd_t)getpid())
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/* thrd_sleep: suspends execution of the calling thread for the given
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* period of time
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*
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* int thrd_sleep(FAR const struct timespec *time_point,
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* FAR struct timespec *remaining);
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*/
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#define thrd_sleep(rqtp,rmtp) nanosleep(rqtp,rmtp)
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/* thrd_yield: yields the current time slice
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*
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* void thrd_yield(void);
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*/
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#define thrd_yield() pthread_yield()
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/* thrd_exit: terminates the calling thread
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*
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* _Noreturn void thrd_exit(int res);
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*/
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#define thrd_exit(res) pthread_exit((pthread_addr_t)res)
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/* thrd_detach: detaches a thread
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*
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* int thrd_detach(thrd_t thr);
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*/
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#define thrd_detach(thr) pthread_detach(thr)
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/* thrd_join: blocks until a thread terminates
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*
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* int thrd_join(thrd_t thr, int *res);
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*/
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static inline int thrd_join(thrd_t thr, int *res)
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{
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pthread_addr_t *value;
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int ret = pthread_join(thr, &value);
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if (res)
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{
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*res = (int)value;
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}
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return ret;
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}
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/* Mutual exclusion *********************************************************/
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/* mtx_init: creates a mutex
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*
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* int mtx_init(FAR mtx_t *mutex, int type);
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*/
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static inline int mtx_init(FAR mtx_t *mutex, int type)
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{
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DEBUGASSERT(mutex && type == mtx_plain);
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return pthread_mutex_init(mutex, NULL);
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}
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/* mtx_lock: blocks until locks a mutex
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*
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* int mtx_lock(FAR mtx_t* mutex);
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*/
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#define mtx_lock(mutex) pthread_mutex_lock(mutex)
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/* mtx_timedlock: blocks until locks a mutex or times out
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*
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* int mtx_timedlock(FAR mtx_t *mutex, FAR const struct timespec *tp);
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*/
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/* mtx_trylock: locks a mutex or returns without blocking if already locked
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*
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* int mtx_trylock(FAR mtx_t *mutex);
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*/
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#define mtx_trylock(mutex) pthread_mutex_trylock(mutex)
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/* mtx_unlock: unlocks a mutex
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*
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* int mtx_unlock(FAR mtx_t *mutex);
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*/
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#define mtx_unlock(mutex) pthread_mutex_unlock(mutex)
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/* mtx_destroy: destroys a mutex
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*
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* void mtx_destroy(FAR mtx_t *mutex);
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*/
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#define mtx_destroy(mutex) pthread_mutex_destroy(mutex)
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/* Call once ****************************************************************/
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/* call_once: calls a function exactly once
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*
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* void call_once(FAR once_flag *flag, CODE void (*func)(void));
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*/
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#define call_once(flag,func) pthread_once(flag,func)
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/* Condition variables ******************************************************/
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/* cnd_init: creates a condition variable
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*
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* int cnd_init(FAR cnd_t *cond);
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*/
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#define cnd_init(cond) pthread_cond_init(cond,NULL)
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/* cnd_signal: unblocks one thread blocked on a condition variable
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*
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* int cnd_signal(FAR cnd_t *cond);
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*/
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#define cnd_signal(cond) pthread_cond_signal(cond)
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/* cnd_broadcast: unblocks all threads blocked on a condition variable
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*
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* int cnd_broadcast(FAR cnd_t *cond);
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*/
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#define cnd_broadcast(cond) pthread_cond_broadcast(cond)
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/* cnd_wait: blocks on a condition variable
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*
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* int cnd_wait(FAR cnd_t *cond, FAR mtx_t *mutex);
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*/
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#define cnd_wait(cond,mutex) pthread_cond_wait(cond,mutex)
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/* cnd_timedwait: blocks on a condition variable, with a timeout
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*
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* int cnd_timedwait(FAR cnd_t *cond, FAR mtx_t *mutex,
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* FAR const struct timespec* tp);
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*/
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#define cnd_timedwait(cond,mutex,tp) pthread_cond_timedwait(cond,mutex,tp)
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/* cnd_destroy: destroys a condition variable
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*
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* void cnd_destroy(FAR cnd_t *cond);
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*/
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#define cnd_destroy(cond) pthread_cond_destroy(cond)
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/* Thread-local storage *****************************************************/
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/* tss_create: creates thread-specific storage pointer with a given destructor
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*
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* int tss_create(FAR tss_t *tss_id, tss_dtor_t destructor);
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*/
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#define tss_create(tss_id,destructor) pthread_key_create(tss_id,destructor)
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/* tss_get: reads from thread-specific storage
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*
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* FAR void *tss_get(tss_t tss_id);
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*/
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#define tss_get(tss_id) pthread_getspecific(tss_id)
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/* tss_set: write to thread-specific storage
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*
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* int tss_set(tss_t tss_id, FAR void *value);
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*/
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#define tss_set(tss_id,value) pthread_setspecific(tss_id,value)
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/* tss_delete: releases the resources held by a given thread-specific pointer
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*
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* void tss_delete(tss_t tss_id);
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*/
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#define tss_delete(tss_id) pthread_key_delete(tss_id)
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#endif /* __INCLUDE_THREADS_H */
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