/*
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* Copyright (C) 2011 Philippe Gerum <rpm@xenomai.org>.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*/
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#ifndef _XENOMAI_ALCHEMY_SEM_H
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#define _XENOMAI_ALCHEMY_SEM_H
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#include <stdint.h>
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#include <alchemy/timer.h>
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/**
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* @addtogroup alchemy_sem
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* @{
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*/
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/** Creation flags. */
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#define S_PRIO 0x1 /* Pend by task priority order. */
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#define S_FIFO 0x0 /* Pend by FIFO order. */
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#define S_PULSE 0x2 /* Enable pulse mode. */
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struct RT_SEM {
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uintptr_t handle;
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};
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typedef struct RT_SEM RT_SEM;
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/**
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* @brief Semaphore status descriptor
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* @anchor RT_SEM_INFO
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*
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* This structure reports various static and runtime information about
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* a semaphore, returned by a call to rt_sem_inquire().
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*/
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struct RT_SEM_INFO {
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/**
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* Current semaphore value.
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*/
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unsigned long count;
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/**
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* Number of tasks waiting on the semaphore.
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*/
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int nwaiters;
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/**
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* Name of semaphore.
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*/
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char name[XNOBJECT_NAME_LEN];
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};
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typedef struct RT_SEM_INFO RT_SEM_INFO;
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#ifdef __cplusplus
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extern "C" {
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#endif
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int rt_sem_create(RT_SEM *sem,
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const char *name,
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unsigned long icount,
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int mode);
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int rt_sem_delete(RT_SEM *sem);
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int rt_sem_p_timed(RT_SEM *sem,
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const struct timespec *abs_timeout);
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static inline int rt_sem_p_until(RT_SEM *sem, RTIME timeout)
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{
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struct timespec ts;
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return rt_sem_p_timed(sem, alchemy_abs_timeout(timeout, &ts));
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}
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static inline int rt_sem_p(RT_SEM *sem, RTIME timeout)
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{
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struct timespec ts;
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return rt_sem_p_timed(sem, alchemy_rel_timeout(timeout, &ts));
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}
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int rt_sem_v(RT_SEM *sem);
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int rt_sem_broadcast(RT_SEM *sem);
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int rt_sem_inquire(RT_SEM *sem,
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RT_SEM_INFO *info);
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int rt_sem_bind(RT_SEM *sem,
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const char *name, RTIME timeout);
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int rt_sem_unbind(RT_SEM *sem);
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#ifdef __cplusplus
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}
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#endif
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/** @} */
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#endif /* _XENOMAI_ALCHEMY_SEM_H */
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