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/*
* This file is part of the SPL: Solaris Porting Layer.
*
* Copyright (c) 2008 Lawrence Livermore National Security, LLC.
* Produced at Lawrence Livermore National Laboratory
* Written by:
* Brian Behlendorf <behlendorf1@llnl.gov>,
* Herb Wartens <wartens2@llnl.gov>,
* Jim Garlick <garlick@llnl.gov>
* UCRL-CODE-235197
*
* This is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This 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 General Public License
* for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef _SPL_MUTEX_H
#define _SPL_MUTEX_H
#ifdef __cplusplus
extern "C" {
#endif
#include <linux/module.h>
#include <linux/hardirq.h>
#include <sys/types.h>
#include <sys/kmem.h>
#define MUTEX_DEFAULT 0
#define MUTEX_SPIN 1
#define MUTEX_ADAPTIVE 2
#define MUTEX_ENTER_TOTAL 0
#define MUTEX_ENTER_NOT_HELD 1
#define MUTEX_ENTER_SPIN 2
#define MUTEX_ENTER_SLEEP 3
#define MUTEX_TRYENTER_TOTAL 4
#define MUTEX_TRYENTER_NOT_HELD 5
#define MUTEX_STATS_SIZE 6
#define KM_MAGIC 0x42424242
#define KM_POISON 0x84
typedef struct {
int32_t km_magic;
int16_t km_type;
int16_t km_name_size;
char *km_name;
struct task_struct *km_owner;
struct semaphore *km_sem;
#ifdef DEBUG_MUTEX
int *km_stats;
struct list_head km_list;
#endif
} kmutex_t;
extern int mutex_spin_max;
#ifdef DEBUG_MUTEX
extern int mutex_stats[MUTEX_STATS_SIZE];
extern spinlock_t mutex_stats_lock;
extern struct list_head mutex_stats_list;
#define MUTEX_STAT_INC(stats, stat) ((stats)[stat]++)
#else
#define MUTEX_STAT_INC(stats, stat)
#endif
int spl_mutex_init(void);
void spl_mutex_fini(void);
extern int __spl_mutex_init(kmutex_t *mp, char *name, int type, void *ibc);
extern void __spl_mutex_destroy(kmutex_t *mp);
extern int __mutex_tryenter(kmutex_t *mp);
extern void __mutex_enter(kmutex_t *mp);
extern void __mutex_exit(kmutex_t *mp);
extern int __mutex_owned(kmutex_t *mp);
extern kthread_t *__spl_mutex_owner(kmutex_t *mp);
#undef mutex_init
#undef mutex_destroy
#define mutex_init(mp, name, type, ibc) \
({ \
/* May never fail or all subsequent mutex_* calls will ASSERT */\
if ((name) == NULL) \
while(__spl_mutex_init(mp, #mp, type, ibc)); \
else \
while(__spl_mutex_init(mp, name, type, ibc)); \
})
#define mutex_destroy(mp) __spl_mutex_destroy(mp)
#define mutex_tryenter(mp) __mutex_tryenter(mp)
#define mutex_enter(mp) __mutex_enter(mp)
#define mutex_exit(mp) __mutex_exit(mp)
#define mutex_owned(mp) __mutex_owned(mp)
#define mutex_owner(mp) __spl_mutex_owner(mp)
#define MUTEX_HELD(mp) mutex_owned(mp)
#ifdef __cplusplus
}
#endif
#endif /* _SPL_MUTEX_H */
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