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sem.h
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sem.h
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/*
* Copyright (C) 2009 Felipe Contreras
*
* Author: Felipe Contreras <felipe.contreras@gmail.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#ifndef SEM_H
#define SEM_H
#include <glib.h>
typedef struct GSem GSem;
struct GSem {
GCond *condition;
GMutex *mutex;
guint count;
};
static inline GSem *
g_sem_new(guint count)
{
GSem *sem;
sem = g_new(GSem, 1);
sem->condition = g_cond_new();
sem->mutex = g_mutex_new();
sem->count = count;
return sem;
}
static inline void
g_sem_free(GSem *sem)
{
g_cond_free(sem->condition);
g_mutex_free(sem->mutex);
g_free(sem);
}
static inline void
g_sem_down(GSem *sem)
{
g_mutex_lock(sem->mutex);
while (sem->count == 0)
g_cond_wait(sem->condition, sem->mutex);
sem->count--;
g_mutex_unlock(sem->mutex);
}
static inline void
g_sem_up(GSem *sem)
{
g_mutex_lock(sem->mutex);
sem->count++;
g_cond_signal(sem->condition);
g_mutex_unlock(sem->mutex);
}
#endif /* SEM_H */