74 lines
1.5 KiB
C
74 lines
1.5 KiB
C
/*
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* \brief Semaphores
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* \author Christian Helmuth
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* \date 2008-09-15
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*/
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/*
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* Copyright (C) 2008-2013 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU General Public License version 2.
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*/
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#ifndef _INCLUDE__DDE_KIT__SEMAPHORE_H_
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#define _INCLUDE__DDE_KIT__SEMAPHORE_H_
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struct dde_kit_sem;
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typedef struct dde_kit_sem dde_kit_sem_t;
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/**
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* Initialize DDE kit semaphore
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*
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* \param value initial semaphore counter
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*
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* \return pointer to new semaphore
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*/
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dde_kit_sem_t *dde_kit_sem_init(int value);
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/**
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* Deinitialize semaphore
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*
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* \param sem semaphore reference
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*/
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void dde_kit_sem_deinit(dde_kit_sem_t *sem);
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/**
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* Acquire semaphore
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*
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* \param sem semaphore reference
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*/
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void dde_kit_sem_down(dde_kit_sem_t *sem);
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/**
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* Acquire semaphore (non-blocking)
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*
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* \param sem semaphore reference
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*
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* \return semaphore state
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* \retval 0 semaphore was acquired
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* \retval !=0 semaphore was not acquired
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*/
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int dde_kit_sem_down_try(dde_kit_sem_t *sem);
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/**
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* Acquire semaphore (with timeout)
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*
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* \param sem semaphore reference
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* \param timeout timeout (in ms)
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*
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* \return semaphore state
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* \retval 0 semaphore was acquired
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* \retval !=0 semaphore was not acquired
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*/
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//int dde_kit_sem_down_timed(dde_kit_sem_t *sem, int timout);
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/**
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* Release semaphore
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*
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* \param sem semaphore reference
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*/
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void dde_kit_sem_up(dde_kit_sem_t *sem);
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#endif /* _INCLUDE__DDE_KIT__SEMAPHORE_H_ */
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