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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 2013 Nexenta Systems, Inc. All rights reserved.
* Copyright 2017 RackTop Systems.
* Copyright 2019 Joyent, Inc.
*/
/*
* condvar(9f)
*/
/* This is the API we're emulating */
#include <sys/condvar.h>
#include <sys/errno.h>
#include <sys/debug.h>
#include <sys/thread.h>
#include <sys/systm.h>
/* avoiding synch.h */
int _lwp_cond_wait(lwp_cond_t *, lwp_mutex_t *);
int _lwp_cond_timedwait(lwp_cond_t *, lwp_mutex_t *, timespec_t *);
int _lwp_cond_reltimedwait(lwp_cond_t *, lwp_mutex_t *, timespec_t *);
int _lwp_cond_signal(lwp_cond_t *);
int _lwp_cond_broadcast(lwp_cond_t *);
extern clock_t ddi_get_lbolt(void);
static int cv__wait(kcondvar_t *, kmutex_t *, int);
static clock_t cv__twait(kcondvar_t *, kmutex_t *, clock_t, int, int);
static const lwp_cond_t default_cv =
{{{0, 0, 0, 0}, USYNC_THREAD, _COND_MAGIC}, 0};
/* ARGSUSED */
void
cv_init(kcondvar_t *cv, char *name, kcv_type_t typ, void *arg)
{
*cv = default_cv;
}
/* ARGSUSED */
void
cv_destroy(kcondvar_t *cv)
{
}
void
cv_signal(kcondvar_t *cv)
{
(void) _lwp_cond_signal(cv);
}
void
cv_broadcast(kcondvar_t *cv)
{
(void) _lwp_cond_broadcast(cv);
}
void
cv_wait(kcondvar_t *cv, kmutex_t *mp)
{
(void) cv__wait(cv, mp, 0);
}
int
cv_wait_sig(kcondvar_t *cv, kmutex_t *mp)
{
return (cv__wait(cv, mp, 1));
}
int
cv__wait(kcondvar_t *cv, kmutex_t *mp, int sigok)
{
int err;
top:
ASSERT(mp->m_owner == _curthread());
mp->m_owner = _KTHREAD_INVALID;
err = _lwp_cond_wait(cv, &mp->m_lock);
mp->m_owner = _curthread();
if (err == 0)
return (1);
if (err == EINTR) {
if (sigok)
return (0);
goto top;
}
return (-1);
}
clock_t
cv_timedwait(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
{
clock_t delta;
delta = abstime - ddi_get_lbolt();
return (cv__twait(cv, mp, delta, 0, 0));
}
clock_t
cv_timedwait_sig(kcondvar_t *cv, kmutex_t *mp, clock_t abstime)
{
clock_t delta;
delta = abstime - ddi_get_lbolt();
return (cv__twait(cv, mp, delta, 1, 0));
}
int
cv_timedwait_sig_hrtime(kcondvar_t *cv, kmutex_t *mp, hrtime_t tim)
{
clock_t delta;
delta = tim;
return (cv__twait(cv, mp, delta, 1, 1));
}
/*ARGSUSED*/
clock_t
cv_timedwait_hires(kcondvar_t *cv, kmutex_t *mp, hrtime_t tim, hrtime_t res,
int flag)
{
clock_t delta;
delta = tim;
if (flag & CALLOUT_FLAG_ABSOLUTE)
delta -= gethrtime();
return (cv__twait(cv, mp, delta, 0, 1));
}
clock_t
cv_reltimedwait(kcondvar_t *cv, kmutex_t *mp, clock_t delta, time_res_t res)
{
_NOTE(ARGUNUSED(res))
return (cv__twait(cv, mp, delta, 0, 0));
}
clock_t
cv_reltimedwait_sig(kcondvar_t *cv, kmutex_t *mp, clock_t delta,
time_res_t res)
{
_NOTE(ARGUNUSED(res))
return (cv__twait(cv, mp, delta, 1, 0));
}
/*
* Factored out implementation of all the cv_*timedwait* functions.
* Note that the delta passed in is relative to the (simulated)
* current time reported by ddi_get_lbolt(). Convert that to
* timespec format and keep calling _lwp_cond_reltimedwait,
* which (NB!) decrements that delta in-place!
*/
static clock_t
cv__twait(kcondvar_t *cv, kmutex_t *mp, clock_t delta, int sigok, int hires)
{
timestruc_t ts;
int err;
if (delta <= 0)
return (-1);
if (hires) {
ts.tv_sec = delta / NANOSEC;
ts.tv_nsec = delta % NANOSEC;
} else {
ts.tv_sec = delta / hz;
ts.tv_nsec = (delta % hz) * (NANOSEC / hz);
}
top:
if (ts.tv_sec == 0 && ts.tv_nsec == 0)
return (-1);
ASSERT(mp->m_owner == _curthread());
mp->m_owner = _KTHREAD_INVALID;
err = _lwp_cond_reltimedwait(cv, &mp->m_lock, &ts);
mp->m_owner = _curthread();
switch (err) {
case 0:
return (1);
case EINTR:
if (sigok)
return (0);
goto top;
default:
ASSERT(0);
/* FALLTHROUGH */
case ETIME:
break;
}
return (-1);
}
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