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/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms of version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2018 Nexenta Systems, Inc. All rights reserved.
* Copyright 2017 RackTop Systems.
*/
/*
* mutex(9f)
*/
/* This is the API we're emulating */
#include <sys/mutex.h>
#include <sys/errno.h>
#include <sys/debug.h>
#include <sys/thread.h>
int _lwp_mutex_lock(lwp_mutex_t *);
int _lwp_mutex_unlock(lwp_mutex_t *);
int _lwp_mutex_trylock(lwp_mutex_t *);
extern clock_t ddi_get_lbolt(void);
/* See: head/synch.h ERRORCHECKMUTEX */
static const lwp_mutex_t default_mutex =
{{0, 0, 0, {USYNC_THREAD|LOCK_ERRORCHECK}, _MUTEX_MAGIC},
{{{0, 0, 0, 0, 0, 0, 0, 0}}}, 0};
/* ARGSUSED */
void
kmutex_init(kmutex_t *mp, char *name, kmutex_type_t typ, void *arg)
{
mp->m_lock = default_mutex;
mp->m_owner = _KTHREAD_INVALID;
}
/* ARGSUSED */
void
kmutex_destroy(kmutex_t *mp)
{
mp->m_owner = _KTHREAD_INVALID;
}
void
kmutex_enter(kmutex_t *mp)
{
kthread_t *t = _curthread();
VERIFY(mp->m_owner != t);
VERIFY(0 == _lwp_mutex_lock(&mp->m_lock));
mp->m_owner = t;
}
int
mutex_tryenter(kmutex_t *mp)
{
int rc;
rc = _lwp_mutex_trylock(&mp->m_lock);
if (rc == 0) {
mp->m_owner = _curthread();
return (1);
}
return (0);
}
void
kmutex_exit(kmutex_t *mp)
{
ASSERT(mp->m_owner == _curthread());
mp->m_owner = _KTHREAD_INVALID;
(void) _lwp_mutex_unlock(&mp->m_lock);
}
/*
* Returns the kthread_t * of the owner.
*/
void *
mutex_owner(const kmutex_t *mp)
{
return (mp->m_owner);
}
int
mutex_owned(const kmutex_t *mp)
{
void *t = _curthread();
return (t == mp->m_owner);
}
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