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/*
* Copyright (C) 2014 René Kijewski <rene.kijewski@fu-berlin.de>
*
* This file is subject to the terms and conditions of the GNU Lesser
* General Public License v2.1. See the file LICENSE in the top level
* directory for more details.
*/
/**
* @ingroup pthread
* @{
* @file
* @brief Thread creation features.
* @note Do not include this header file directly, but pthread.h.
*/
#ifndef SYS__POSIX__PTHREAD_THREADING__H
#define SYS__POSIX__PTHREAD_THREADING__H
#include "kernel_defines.h"
#ifdef __cplusplus
extern "C" {
#endif
/**
* @brief Datatype to identify a POSIX thread.
* @note The pthread ids are one off to the index in the internal array.
*/
typedef unsigned pthread_t;
/**
* @brief Spawn a new POSIX thread.
* @details This functions starts a new thread.
* The thread will be joinable (from another pthread),
* unless `attr` tells to create the thread detached.
* A non-detached thread must be joined will stay a zombie into it is joined.
* You can call pthread_exit() inside the thread, or return from `start_routine()`.
* @note Cancellation is currently not implemented.
* @note In an embedded system you probably want to supply a statically allocated stack in `attr`.
* @param[out] newthread The identifier of the new thread.
* @param[in] attr An attribute set that describes how the new thread should be started.
* @param[in] start_routine The entry point of the new thread.
* @param[in] arg Argument supplied to `start_routine`.
* @return `== 0` on success.
* `!= 0` on error.
*/
int pthread_create(pthread_t *newthread, const pthread_attr_t *attr, void *(*start_routine)(void *), void *arg);
/**
* @brief Exit calling pthread.
* @note Only pthreads must call this function.
* Native threads must call sched_thread_exit().
* A pthread must not call sched_thread_exit().
* @param[out] retval Return value, supplied to a joining thread.
* @return This function does not return.
*/
void pthread_exit(void *retval) NORETURN;
/**
* @brief Join a pthread.
* @details The current thread sleeps until `th` exits.
* The exit value of `th` gets written into `thread_return`.
* You can only join pthreads, and only pthreads can join.
* A thread must not join itself.
* @param[in] th pthread to join, the id was supplied by pthread_create()
* @param[out] thread_return Exit code of `th`.
* @return `== 0` on success.
* `!= 0` on error.
*/
int pthread_join(pthread_t th, void **thread_return);
/**
* @brief Make a pthread unjoinable.
* @details The resources of a detached thread get released as soon as it exits,
* without the need to call pthread_join() out of another pthread.
* In fact you cannot join a detached thread, it will return an error.
* Detaching a thread while another thread tries to join it causes undefined behavior.
* A pthread may detach himself.
* A non-pthread may call this function, too.
* A pthread cannot be "attached" again.
* @param[in] th pthread to detach.
* @return `== 0` on success.
* `!= 0` on error.
*/
int pthread_detach(pthread_t th);
/**
* @brief Returns the pthread id of the calling/current thread.
* @note This function should not be used to determine if the calling thread is a pthread.
* If your logic is sane then there should be no need to do that.
* @return `> 0` identifies the calling pthread.
* `== 0` if the calling thread is not a pthread.
*/
pthread_t pthread_self(void);
/**
* @brief Compared two pthread identifiers.
* @return `0` if the ids identify two different threads.
*/
static inline int pthread_equal(pthread_t thread1, pthread_t thread2)
{
return thread1 == thread2;
}
#ifdef __cplusplus
}
#endif
#endif /* SYS__POSIX__PTHREAD_THREADING__H */
/**
* @}
*/
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