/**
 * \file
 * <!--
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 * GNU General Public License for more details.
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 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
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 * library without restriction.  Specifically, if other files instantiate
 * templates or use macros or inline functions from this file, or you compile
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 * Copyright 2001,2004,2005,2006,2007 Develer S.r.l. (http://www.develer.com/)
 * Copyright 1999,2000,2001 Bernie Innocenti <bernie@codewiz.org>
 *
 * -->
 *
 * \defgroup kern_sem Mutually exclusive semaphores
 * \ingroup kern
 * \{
 * \brief Mutually exclusive semaphores.
 *        Shared locking not supported in this implementation.
 *
 *
 * \author Bernie Innocenti <bernie@codewiz.org>
 *
 * $WIZ$ module_name = "semaphores"
 * $WIZ$ module_depends = "kernel"
 * $WIZ$ module_configuration = "bertos/cfg/cfg_sem.h"
 */


#ifndef KERN_SEM_H
#define KERN_SEM_H

#include <cfg/compiler.h>
#include <struct/list.h>

/* Fwd decl */
struct Process;


typedef struct Semaphore
{
	struct Process *owner;
	List            wait_queue;
	int             nest_count;
} Semaphore;

/**
 * \name Process synchronization services
 * \{
 */
void sem_init(struct Semaphore *s);
bool sem_attempt(struct Semaphore *s);
void sem_obtain(struct Semaphore *s);
void sem_release(struct Semaphore *s);
/* \} */
/* \} */ //defgroup kern_sem

int sem_testRun(void);
int sem_testSetup(void);
int sem_testTearDown(void);

#endif /* KERN_SEM_H */