314 lines
7.8 KiB
C
314 lines
7.8 KiB
C
/****************************************************************************
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* include/threads.h
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*
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* Licensed to the Apache Software Foundation (ASF) under one or more
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* contributor license agreements. See the NOTICE file distributed with
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* this work for additional information regarding copyright ownership. The
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* ASF licenses this file to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance with the
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* License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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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 (OK)
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#define thrd_timedout (ETIMEDOUT)
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#define thrd_busy (EBUSY)
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#define thrd_nomem (ENOMEM)
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#define thrd_error (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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#ifndef __cplusplus
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#define thread_local _Thread_local
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#endif
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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 mtx_t pthread_mutex_t
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/* once_flag: the type of the flag used by call_once */
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#define once_flag pthread_once_t
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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)gettid())
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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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FAR pthread_mutexattr_t *pattr = NULL;
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pthread_mutexattr_t attr;
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if (type & mtx_recursive)
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{
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pthread_mutexattr_init(&attr);
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pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
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pattr = &attr;
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}
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return pthread_mutex_init(mutex, pattr);
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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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#define mtx_timedlock(mutex,tp) pthread_mutex_timedwait(mutex,tp)
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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 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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