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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 2015 Joyent, Inc.
*/
/*
* Event loop mechanism for our backend.
*
* For more information, see the big theory statement in
* lib/varpd/svp/common/libvarpd_svp.c.
*/
#include <unistd.h>
#include <thread.h>
#include <port.h>
#include <signal.h>
#include <time.h>
#include <errno.h>
#include <umem.h>
#include <libvarpd_svp.h>
typedef struct svp_event_loop {
int sel_port; /* RO */
int sel_nthread; /* RO */
thread_t *sel_threads; /* RO */
boolean_t sel_stop; /* svp_elock */
timer_t sel_hosttimer;
} svp_event_loop_t;
static svp_event_loop_t svp_event;
static mutex_t svp_elock = ERRORCHECKMUTEX;
/* ARGSUSED */
static void *
svp_event_thr(void *arg)
{
for (;;) {
int ret;
port_event_t pe;
svp_event_t *sep;
mutex_enter(&svp_elock);
if (svp_event.sel_stop == B_TRUE) {
mutex_exit(&svp_elock);
break;
}
mutex_exit(&svp_elock);
ret = port_get(svp_event.sel_port, &pe, NULL);
if (ret != 0) {
switch (errno) {
case EFAULT:
case EBADF:
case EINVAL:
libvarpd_panic("unexpected port_get errno: %d",
errno);
default:
break;
}
}
if (pe.portev_user == NULL)
libvarpd_panic("received event (%p) without "
"protev_user set", &pe);
sep = (svp_event_t *)pe.portev_user;
sep->se_func(&pe, sep->se_arg);
}
return (NULL);
}
int
svp_event_associate(svp_event_t *sep, int fd)
{
int ret;
ret = port_associate(svp_event.sel_port, PORT_SOURCE_FD, fd,
sep->se_events, sep);
if (ret != 0) {
switch (errno) {
case EBADF:
case EBADFD:
case EINVAL:
case EAGAIN:
libvarpd_panic("unexpected port_associate error: %d",
errno);
default:
ret = errno;
break;
}
}
return (ret);
}
/* ARGSUSED */
int
svp_event_dissociate(svp_event_t *sep, int fd)
{
int ret;
ret = port_dissociate(svp_event.sel_port, PORT_SOURCE_FD, fd);
if (ret != 0) {
if (errno != ENOENT)
libvarpd_panic("unexpected port_dissociate error: %d",
errno);
ret = errno;
}
return (ret);
}
int
svp_event_inject(svp_event_t *user)
{
return (port_send(svp_event.sel_port, 0, user));
}
int
svp_event_timer_init(svp_event_t *sep)
{
port_notify_t pn;
struct sigevent evp;
struct itimerspec ts;
pn.portnfy_port = svp_event.sel_port;
pn.portnfy_user = sep;
evp.sigev_notify = SIGEV_PORT;
evp.sigev_value.sival_ptr = &pn;
if (timer_create(CLOCK_REALTIME, &evp, &svp_event.sel_hosttimer) != 0)
return (errno);
ts.it_value.tv_sec = svp_tickrate;
ts.it_value.tv_nsec = 0;
ts.it_interval.tv_sec = svp_tickrate;
ts.it_interval.tv_nsec = 0;
if (timer_settime(svp_event.sel_hosttimer, TIMER_RELTIME, &ts,
NULL) != 0) {
int ret = errno;
(void) timer_delete(svp_event.sel_hosttimer);
return (ret);
}
return (0);
}
int
svp_event_init(void)
{
long i, ncpus;
svp_event.sel_port = port_create();
if (svp_event.sel_port == -1)
return (errno);
ncpus = sysconf(_SC_NPROCESSORS_ONLN) * 2 + 1;
if (ncpus <= 0)
libvarpd_panic("sysconf for nprocs failed... %d/%d",
ncpus, errno);
svp_event.sel_threads = umem_alloc(sizeof (thread_t) * ncpus,
UMEM_DEFAULT);
if (svp_event.sel_threads == NULL) {
int ret = errno;
(void) timer_delete(svp_event.sel_hosttimer);
(void) close(svp_event.sel_port);
svp_event.sel_port = -1;
return (ret);
}
for (i = 0; i < ncpus; i++) {
int ret;
thread_t *thr = &svp_event.sel_threads[i];
ret = thr_create(NULL, 0, svp_event_thr, NULL,
THR_DETACHED | THR_DAEMON, thr);
if (ret != 0) {
ret = errno;
(void) timer_delete(svp_event.sel_hosttimer);
(void) close(svp_event.sel_port);
svp_event.sel_port = -1;
return (errno);
}
}
return (0);
}
void
svp_event_fini(void)
{
mutex_enter(&svp_elock);
svp_event.sel_stop = B_TRUE;
mutex_exit(&svp_elock);
(void) timer_delete(svp_event.sel_hosttimer);
(void) close(svp_event.sel_port);
}
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