2010-03-10 11:38:55 +01:00
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/*
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* QEMU System Emulator
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*
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* Copyright (c) 2003-2008 Fabrice Bellard
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "sysemu.h"
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#include "net.h"
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#include "monitor.h"
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#include "console.h"
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#include "hw/hw.h"
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2012-04-20 10:27:06 +02:00
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#include "qemu-timer.h"
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2012-11-02 22:12:53 +01:00
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#ifdef CONFIG_POSIX
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#include <pthread.h>
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#endif
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2012-04-20 10:27:06 +02:00
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2010-03-10 11:38:55 +01:00
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#ifdef _WIN32
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#include <mmsystem.h>
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#endif
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/***********************************************************/
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/* timers */
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#define QEMU_CLOCK_REALTIME 0
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#define QEMU_CLOCK_VIRTUAL 1
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#define QEMU_CLOCK_HOST 2
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struct QEMUClock {
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2011-09-13 11:42:26 +02:00
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QEMUTimer *active_timers;
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2011-06-20 14:06:27 +02:00
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NotifierList reset_notifiers;
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int64_t last;
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2012-04-20 11:51:58 +02:00
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int type;
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bool enabled;
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2010-03-10 11:38:55 +01:00
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};
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struct QEMUTimer {
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2011-03-11 16:33:58 +01:00
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int64_t expire_time; /* in nanoseconds */
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2012-04-20 11:51:58 +02:00
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QEMUClock *clock;
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2010-03-10 11:38:55 +01:00
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QEMUTimerCB *cb;
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void *opaque;
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2012-04-20 11:51:58 +02:00
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QEMUTimer *next;
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int scale;
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2010-03-10 11:38:55 +01:00
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};
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struct qemu_alarm_timer {
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char const *name;
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int (*start)(struct qemu_alarm_timer *t);
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void (*stop)(struct qemu_alarm_timer *t);
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2011-03-14 09:45:38 +01:00
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void (*rearm)(struct qemu_alarm_timer *t, int64_t nearest_delta_ns);
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2011-04-10 20:15:09 +02:00
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#if defined(__linux__)
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timer_t timer;
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2012-04-20 11:51:58 +02:00
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int fd;
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2011-04-10 20:15:09 +02:00
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#elif defined(_WIN32)
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HANDLE timer;
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#endif
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2012-04-20 10:45:48 +02:00
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bool expired;
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bool pending;
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2010-03-10 11:38:55 +01:00
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};
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static struct qemu_alarm_timer *alarm_timer;
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2011-03-24 21:31:24 +01:00
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static bool qemu_timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
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{
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return timer_head && (timer_head->expire_time <= current_time);
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}
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2011-03-14 09:45:38 +01:00
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static int64_t qemu_next_alarm_deadline(void)
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{
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2012-04-13 20:35:03 +02:00
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int64_t delta = INT64_MAX;
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2011-03-14 09:45:38 +01:00
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int64_t rtdelta;
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2012-04-13 20:35:03 +02:00
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if (!use_icount && vm_clock->enabled && vm_clock->active_timers) {
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2011-03-14 09:45:38 +01:00
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delta = vm_clock->active_timers->expire_time -
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qemu_get_clock_ns(vm_clock);
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}
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2012-04-13 20:35:03 +02:00
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if (host_clock->enabled && host_clock->active_timers) {
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2011-03-14 09:45:38 +01:00
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int64_t hdelta = host_clock->active_timers->expire_time -
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qemu_get_clock_ns(host_clock);
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if (hdelta < delta) {
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delta = hdelta;
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}
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}
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2012-04-13 20:35:03 +02:00
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if (rt_clock->enabled && rt_clock->active_timers) {
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2011-03-14 09:45:38 +01:00
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rtdelta = (rt_clock->active_timers->expire_time -
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qemu_get_clock_ns(rt_clock));
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if (rtdelta < delta) {
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delta = rtdelta;
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}
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}
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return delta;
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}
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2010-03-10 11:38:55 +01:00
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static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
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{
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2012-05-29 05:35:24 +02:00
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int64_t nearest_delta_ns = qemu_next_alarm_deadline();
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if (nearest_delta_ns < INT64_MAX) {
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t->rearm(t, nearest_delta_ns);
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2011-03-14 09:45:38 +01:00
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}
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2010-03-10 11:38:55 +01:00
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}
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2011-02-03 14:48:59 +01:00
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/* TODO: MIN_TIMER_REARM_NS should be optimized */
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#define MIN_TIMER_REARM_NS 250000
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2010-03-10 11:38:55 +01:00
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#ifdef _WIN32
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2011-04-05 18:34:21 +02:00
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static int mm_start_timer(struct qemu_alarm_timer *t);
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static void mm_stop_timer(struct qemu_alarm_timer *t);
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2011-03-14 09:45:38 +01:00
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static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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2011-04-05 18:34:21 +02:00
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2010-03-10 11:38:55 +01:00
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static int win32_start_timer(struct qemu_alarm_timer *t);
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static void win32_stop_timer(struct qemu_alarm_timer *t);
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2011-03-14 09:45:38 +01:00
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static void win32_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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2010-03-10 11:38:55 +01:00
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#else
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static int unix_start_timer(struct qemu_alarm_timer *t);
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static void unix_stop_timer(struct qemu_alarm_timer *t);
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2011-03-14 09:45:38 +01:00
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static void unix_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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2010-03-10 11:38:55 +01:00
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#ifdef __linux__
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static int dynticks_start_timer(struct qemu_alarm_timer *t);
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static void dynticks_stop_timer(struct qemu_alarm_timer *t);
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2011-03-14 09:45:38 +01:00
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static void dynticks_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
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2010-03-10 11:38:55 +01:00
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#endif /* __linux__ */
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#endif /* _WIN32 */
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static struct qemu_alarm_timer alarm_timers[] = {
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#ifndef _WIN32
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#ifdef __linux__
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{"dynticks", dynticks_start_timer,
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2011-04-10 20:15:09 +02:00
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dynticks_stop_timer, dynticks_rearm_timer},
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2010-03-10 11:38:55 +01:00
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#endif
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2011-06-09 13:10:25 +02:00
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{"unix", unix_start_timer, unix_stop_timer, unix_rearm_timer},
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2010-03-10 11:38:55 +01:00
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#else
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2011-11-09 12:46:56 +01:00
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{"mmtimer", mm_start_timer, mm_stop_timer, mm_rearm_timer},
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2011-04-10 20:15:09 +02:00
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{"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer},
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2010-03-10 11:38:55 +01:00
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#endif
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{NULL, }
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};
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static void show_available_alarms(void)
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{
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int i;
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printf("Available alarm timers, in order of precedence:\n");
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for (i = 0; alarm_timers[i].name; i++)
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printf("%s\n", alarm_timers[i].name);
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}
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void configure_alarms(char const *opt)
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{
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int i;
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int cur = 0;
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int count = ARRAY_SIZE(alarm_timers) - 1;
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char *arg;
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char *name;
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struct qemu_alarm_timer tmp;
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2012-08-02 14:45:54 +02:00
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if (is_help_option(opt)) {
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2010-03-10 11:38:55 +01:00
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show_available_alarms();
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exit(0);
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}
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2011-08-21 05:09:37 +02:00
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arg = g_strdup(opt);
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2010-03-10 11:38:55 +01:00
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/* Reorder the array */
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name = strtok(arg, ",");
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while (name) {
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for (i = 0; i < count && alarm_timers[i].name; i++) {
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if (!strcmp(alarm_timers[i].name, name))
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break;
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}
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if (i == count) {
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fprintf(stderr, "Unknown clock %s\n", name);
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goto next;
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}
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if (i < cur)
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/* Ignore */
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goto next;
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/* Swap */
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tmp = alarm_timers[i];
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alarm_timers[i] = alarm_timers[cur];
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alarm_timers[cur] = tmp;
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cur++;
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next:
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name = strtok(NULL, ",");
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}
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2011-08-21 05:09:37 +02:00
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g_free(arg);
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2010-03-10 11:38:55 +01:00
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if (cur) {
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/* Disable remaining timers */
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for (i = cur; i < count; i++)
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alarm_timers[i].name = NULL;
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} else {
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show_available_alarms();
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exit(1);
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}
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}
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QEMUClock *rt_clock;
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QEMUClock *vm_clock;
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QEMUClock *host_clock;
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static QEMUClock *qemu_new_clock(int type)
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{
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QEMUClock *clock;
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2011-06-20 14:06:27 +02:00
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2011-08-21 05:09:37 +02:00
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clock = g_malloc0(sizeof(QEMUClock));
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2010-03-10 11:38:55 +01:00
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clock->type = type;
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2012-04-20 10:45:48 +02:00
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clock->enabled = true;
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2011-09-12 16:21:44 +02:00
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clock->last = INT64_MIN;
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2011-06-20 14:06:27 +02:00
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notifier_list_init(&clock->reset_notifiers);
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2010-03-10 11:38:55 +01:00
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return clock;
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}
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2012-04-20 10:45:48 +02:00
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void qemu_clock_enable(QEMUClock *clock, bool enabled)
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2010-03-10 11:38:55 +01:00
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{
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2011-09-27 18:23:14 +02:00
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bool old = clock->enabled;
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2010-03-10 11:38:55 +01:00
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clock->enabled = enabled;
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2011-09-27 18:23:14 +02:00
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if (enabled && !old) {
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qemu_rearm_alarm_timer(alarm_timer);
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}
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2010-03-10 11:38:55 +01:00
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}
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2011-09-12 15:50:16 +02:00
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int64_t qemu_clock_has_timers(QEMUClock *clock)
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{
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return !!clock->active_timers;
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}
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int64_t qemu_clock_expired(QEMUClock *clock)
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{
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return (clock->active_timers &&
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clock->active_timers->expire_time < qemu_get_clock_ns(clock));
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}
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int64_t qemu_clock_deadline(QEMUClock *clock)
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{
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/* To avoid problems with overflow limit this to 2^32. */
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int64_t delta = INT32_MAX;
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if (clock->active_timers) {
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delta = clock->active_timers->expire_time - qemu_get_clock_ns(clock);
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}
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if (delta < 0) {
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delta = 0;
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}
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return delta;
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}
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2011-03-11 16:33:58 +01:00
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QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
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QEMUTimerCB *cb, void *opaque)
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2010-03-10 11:38:55 +01:00
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{
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QEMUTimer *ts;
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2011-08-21 05:09:37 +02:00
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ts = g_malloc0(sizeof(QEMUTimer));
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2010-03-10 11:38:55 +01:00
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ts->clock = clock;
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ts->cb = cb;
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ts->opaque = opaque;
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2011-03-11 16:33:58 +01:00
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ts->scale = scale;
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2010-03-10 11:38:55 +01:00
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return ts;
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}
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void qemu_free_timer(QEMUTimer *ts)
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{
|
2011-08-21 05:09:37 +02:00
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g_free(ts);
|
2010-03-10 11:38:55 +01:00
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}
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/* stop a timer, but do not dealloc it */
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void qemu_del_timer(QEMUTimer *ts)
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{
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QEMUTimer **pt, *t;
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/* NOTE: this code must be signal safe because
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qemu_timer_expired() can be called from a signal. */
|
2011-09-13 11:42:26 +02:00
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pt = &ts->clock->active_timers;
|
2010-03-10 11:38:55 +01:00
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for(;;) {
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t = *pt;
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if (!t)
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break;
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if (t == ts) {
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*pt = t->next;
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break;
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}
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pt = &t->next;
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}
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}
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/* modify the current timer so that it will be fired when current_time
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>= expire_time. The corresponding callback will be called. */
|
2011-09-12 16:21:44 +02:00
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|
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void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time)
|
2010-03-10 11:38:55 +01:00
|
|
|
{
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QEMUTimer **pt, *t;
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|
|
qemu_del_timer(ts);
|
|
|
|
|
|
|
|
/* add the timer in the sorted list */
|
|
|
|
/* NOTE: this code must be signal safe because
|
|
|
|
qemu_timer_expired() can be called from a signal. */
|
2011-09-13 11:42:26 +02:00
|
|
|
pt = &ts->clock->active_timers;
|
2010-03-10 11:38:55 +01:00
|
|
|
for(;;) {
|
|
|
|
t = *pt;
|
2011-03-24 21:31:24 +01:00
|
|
|
if (!qemu_timer_expired_ns(t, expire_time)) {
|
2010-03-10 11:38:55 +01:00
|
|
|
break;
|
2011-03-24 21:31:24 +01:00
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
pt = &t->next;
|
|
|
|
}
|
|
|
|
ts->expire_time = expire_time;
|
|
|
|
ts->next = *pt;
|
|
|
|
*pt = ts;
|
|
|
|
|
|
|
|
/* Rearm if necessary */
|
2011-09-13 11:42:26 +02:00
|
|
|
if (pt == &ts->clock->active_timers) {
|
2010-03-10 11:38:55 +01:00
|
|
|
if (!alarm_timer->pending) {
|
|
|
|
qemu_rearm_alarm_timer(alarm_timer);
|
|
|
|
}
|
|
|
|
/* Interrupt execution to force deadline recalculation. */
|
enable vm_clock to "warp" in the iothread+icount case
The previous patch however is not enough, because if the virtual CPU
goes to sleep waiting for a future timer interrupt to wake it up, qemu
deadlocks. The timer interrupt never comes because time is driven by
icount, but the vCPU doesn't run any insns.
You could say that VCPUs should never go to sleep in icount
mode if there is a pending vm_clock timer; rather time should
just warp to the next vm_clock event with no sleep ever taking place.
Even better, you can sleep for some time related to the
time left until the next event, to avoid that the warps are too visible
externally; for example, you could be sending network packets continously
instead of every 100ms.
This is what this patch implements. qemu_clock_warp is called: 1)
whenever a vm_clock timer is adjusted, to ensure the warp_timer is
synchronized; 2) at strategic points in the CPU thread, to make sure
the insn counter is synchronized before the CPU starts running.
In any case, the warp_timer is disabled while the CPU is running,
because the insn counter will then be making progress on its own.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-13 10:03:44 +02:00
|
|
|
qemu_clock_warp(ts->clock);
|
|
|
|
if (use_icount) {
|
2010-03-10 11:38:55 +01:00
|
|
|
qemu_notify_event();
|
enable vm_clock to "warp" in the iothread+icount case
The previous patch however is not enough, because if the virtual CPU
goes to sleep waiting for a future timer interrupt to wake it up, qemu
deadlocks. The timer interrupt never comes because time is driven by
icount, but the vCPU doesn't run any insns.
You could say that VCPUs should never go to sleep in icount
mode if there is a pending vm_clock timer; rather time should
just warp to the next vm_clock event with no sleep ever taking place.
Even better, you can sleep for some time related to the
time left until the next event, to avoid that the warps are too visible
externally; for example, you could be sending network packets continously
instead of every 100ms.
This is what this patch implements. qemu_clock_warp is called: 1)
whenever a vm_clock timer is adjusted, to ensure the warp_timer is
synchronized; 2) at strategic points in the CPU thread, to make sure
the insn counter is synchronized before the CPU starts running.
In any case, the warp_timer is disabled while the CPU is running,
because the insn counter will then be making progress on its own.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Tested-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
Signed-off-by: Edgar E. Iglesias <edgar.iglesias@gmail.com>
2011-04-13 10:03:44 +02:00
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-03-11 16:33:58 +01:00
|
|
|
void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
|
|
|
|
{
|
|
|
|
qemu_mod_timer_ns(ts, expire_time * ts->scale);
|
|
|
|
}
|
|
|
|
|
2012-04-20 10:45:48 +02:00
|
|
|
bool qemu_timer_pending(QEMUTimer *ts)
|
2010-03-10 11:38:55 +01:00
|
|
|
{
|
|
|
|
QEMUTimer *t;
|
2011-09-13 11:42:26 +02:00
|
|
|
for (t = ts->clock->active_timers; t != NULL; t = t->next) {
|
2012-04-20 10:45:48 +02:00
|
|
|
if (t == ts) {
|
|
|
|
return true;
|
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
2012-04-20 10:45:48 +02:00
|
|
|
return false;
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
2012-04-20 10:45:48 +02:00
|
|
|
bool qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
|
2010-03-10 11:38:55 +01:00
|
|
|
{
|
2011-03-24 21:31:24 +01:00
|
|
|
return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale);
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
2012-03-28 15:42:04 +02:00
|
|
|
void qemu_run_timers(QEMUClock *clock)
|
2010-03-10 11:38:55 +01:00
|
|
|
{
|
2012-09-19 15:52:44 +02:00
|
|
|
QEMUTimer *ts;
|
2010-03-10 11:38:55 +01:00
|
|
|
int64_t current_time;
|
|
|
|
|
|
|
|
if (!clock->enabled)
|
|
|
|
return;
|
|
|
|
|
2011-03-11 16:33:58 +01:00
|
|
|
current_time = qemu_get_clock_ns(clock);
|
2010-03-10 11:38:55 +01:00
|
|
|
for(;;) {
|
2012-09-19 15:52:44 +02:00
|
|
|
ts = clock->active_timers;
|
2011-03-24 21:31:24 +01:00
|
|
|
if (!qemu_timer_expired_ns(ts, current_time)) {
|
2010-03-10 11:38:55 +01:00
|
|
|
break;
|
2011-03-24 21:31:24 +01:00
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
/* remove timer from the list before calling the callback */
|
2012-09-19 15:52:44 +02:00
|
|
|
clock->active_timers = ts->next;
|
2010-03-10 11:38:55 +01:00
|
|
|
ts->next = NULL;
|
|
|
|
|
|
|
|
/* run the callback (the timer list can be modified) */
|
|
|
|
ts->cb(ts->opaque);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
int64_t qemu_get_clock_ns(QEMUClock *clock)
|
|
|
|
{
|
2011-06-20 14:06:27 +02:00
|
|
|
int64_t now, last;
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
switch(clock->type) {
|
|
|
|
case QEMU_CLOCK_REALTIME:
|
|
|
|
return get_clock();
|
|
|
|
default:
|
|
|
|
case QEMU_CLOCK_VIRTUAL:
|
|
|
|
if (use_icount) {
|
|
|
|
return cpu_get_icount();
|
|
|
|
} else {
|
|
|
|
return cpu_get_clock();
|
|
|
|
}
|
|
|
|
case QEMU_CLOCK_HOST:
|
2011-06-20 14:06:27 +02:00
|
|
|
now = get_clock_realtime();
|
|
|
|
last = clock->last;
|
|
|
|
clock->last = now;
|
|
|
|
if (now < last) {
|
|
|
|
notifier_list_notify(&clock->reset_notifiers, &now);
|
|
|
|
}
|
|
|
|
return now;
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2011-06-20 14:06:27 +02:00
|
|
|
void qemu_register_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
|
|
|
|
{
|
|
|
|
notifier_list_add(&clock->reset_notifiers, notifier);
|
|
|
|
}
|
|
|
|
|
|
|
|
void qemu_unregister_clock_reset_notifier(QEMUClock *clock, Notifier *notifier)
|
|
|
|
{
|
2012-01-13 17:34:01 +01:00
|
|
|
notifier_remove(notifier);
|
2011-06-20 14:06:27 +02:00
|
|
|
}
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
void init_clocks(void)
|
|
|
|
{
|
2012-10-29 15:26:28 +01:00
|
|
|
if (!rt_clock) {
|
|
|
|
rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME);
|
|
|
|
vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL);
|
|
|
|
host_clock = qemu_new_clock(QEMU_CLOCK_HOST);
|
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
2011-09-12 16:21:44 +02:00
|
|
|
uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts)
|
2010-03-10 11:38:55 +01:00
|
|
|
{
|
2011-09-12 16:21:44 +02:00
|
|
|
return qemu_timer_pending(ts) ? ts->expire_time : -1;
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
void qemu_run_all_timers(void)
|
|
|
|
{
|
2012-04-20 10:45:48 +02:00
|
|
|
alarm_timer->pending = false;
|
2010-03-19 11:30:35 +01:00
|
|
|
|
qemu-timer.c: Remove 250us timeouts
Basically, the main wait loop calls qemu_run_all_timers() unconditionally. The
first thing this routine used to do is to see if a timer had been serviced,
and then reset the loop timeout to the next deadline.
However, the new deadlines had not been calculated at that point, as
qemu_run_timers() had not been called yet for each of the clocks. So
qemu_rearm_alarm_timer() would end up with a negative or zero deadline, and
default to setting a 250us timeout for the loop.
As qemu_run_timers() is called for each clock, the real deadlines would be put
in place, but because a loop timeout was already set, the loop timeout would
not be changed.
Once that 250us timeout fired, the real deadline would be used for the
subsequent timeout.
For idle VMs, this effectively doubles the number of times through the loop,
doubling the number of select() system calls, timer calls, etc. putting added
scheduling pressure on the kernel. And under cgroups, this really causes a big
problem because the cgroup code does not scale well.
By simply running the timers before trying to rearm the timer, we always rearm
with a non-zero deadline, effectively halving the number of system calls.
Signed-off-by: Peter Portante <pportant@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2012-04-05 17:00:45 +02:00
|
|
|
/* vm time timers */
|
|
|
|
qemu_run_timers(vm_clock);
|
|
|
|
qemu_run_timers(rt_clock);
|
|
|
|
qemu_run_timers(host_clock);
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
/* rearm timer, if not periodic */
|
|
|
|
if (alarm_timer->expired) {
|
2012-04-20 10:45:48 +02:00
|
|
|
alarm_timer->expired = false;
|
2010-03-10 11:38:55 +01:00
|
|
|
qemu_rearm_alarm_timer(alarm_timer);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#ifdef _WIN32
|
2011-03-12 17:43:50 +01:00
|
|
|
static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused)
|
2010-03-10 11:38:55 +01:00
|
|
|
#else
|
|
|
|
static void host_alarm_handler(int host_signum)
|
|
|
|
#endif
|
|
|
|
{
|
|
|
|
struct qemu_alarm_timer *t = alarm_timer;
|
|
|
|
if (!t)
|
|
|
|
return;
|
|
|
|
|
2012-04-20 11:27:24 +02:00
|
|
|
t->expired = true;
|
|
|
|
t->pending = true;
|
|
|
|
qemu_notify_event();
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
2011-02-03 14:49:01 +01:00
|
|
|
#if defined(__linux__)
|
|
|
|
|
2011-06-17 11:25:49 +02:00
|
|
|
#include "compatfd.h"
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
static int dynticks_start_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
|
|
|
struct sigevent ev;
|
|
|
|
timer_t host_timer;
|
|
|
|
struct sigaction act;
|
|
|
|
|
|
|
|
sigfillset(&act.sa_mask);
|
|
|
|
act.sa_flags = 0;
|
|
|
|
act.sa_handler = host_alarm_handler;
|
|
|
|
|
|
|
|
sigaction(SIGALRM, &act, NULL);
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Initialize ev struct to 0 to avoid valgrind complaining
|
|
|
|
* about uninitialized data in timer_create call
|
|
|
|
*/
|
|
|
|
memset(&ev, 0, sizeof(ev));
|
|
|
|
ev.sigev_value.sival_int = 0;
|
|
|
|
ev.sigev_notify = SIGEV_SIGNAL;
|
2012-10-22 23:33:00 +02:00
|
|
|
#ifdef CONFIG_SIGEV_THREAD_ID
|
2011-06-17 11:25:49 +02:00
|
|
|
if (qemu_signalfd_available()) {
|
|
|
|
ev.sigev_notify = SIGEV_THREAD_ID;
|
|
|
|
ev._sigev_un._tid = qemu_get_thread_id();
|
|
|
|
}
|
2012-10-22 23:33:00 +02:00
|
|
|
#endif /* CONFIG_SIGEV_THREAD_ID */
|
2010-03-10 11:38:55 +01:00
|
|
|
ev.sigev_signo = SIGALRM;
|
|
|
|
|
|
|
|
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
|
|
|
|
perror("timer_create");
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2011-04-10 20:15:09 +02:00
|
|
|
t->timer = host_timer;
|
2010-03-10 11:38:55 +01:00
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void dynticks_stop_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
2011-04-10 20:15:09 +02:00
|
|
|
timer_t host_timer = t->timer;
|
2010-03-10 11:38:55 +01:00
|
|
|
|
|
|
|
timer_delete(host_timer);
|
|
|
|
}
|
|
|
|
|
2011-03-14 09:45:38 +01:00
|
|
|
static void dynticks_rearm_timer(struct qemu_alarm_timer *t,
|
|
|
|
int64_t nearest_delta_ns)
|
2010-03-10 11:38:55 +01:00
|
|
|
{
|
2011-04-10 20:15:09 +02:00
|
|
|
timer_t host_timer = t->timer;
|
2010-03-10 11:38:55 +01:00
|
|
|
struct itimerspec timeout;
|
2011-02-03 14:48:59 +01:00
|
|
|
int64_t current_ns;
|
2010-03-10 11:38:55 +01:00
|
|
|
|
2011-02-03 14:49:01 +01:00
|
|
|
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
|
|
|
nearest_delta_ns = MIN_TIMER_REARM_NS;
|
2010-03-10 11:38:55 +01:00
|
|
|
|
|
|
|
/* check whether a timer is already running */
|
|
|
|
if (timer_gettime(host_timer, &timeout)) {
|
|
|
|
perror("gettime");
|
|
|
|
fprintf(stderr, "Internal timer error: aborting\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2011-02-03 14:48:59 +01:00
|
|
|
current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
|
|
|
|
if (current_ns && current_ns <= nearest_delta_ns)
|
2010-03-10 11:38:55 +01:00
|
|
|
return;
|
|
|
|
|
|
|
|
timeout.it_interval.tv_sec = 0;
|
|
|
|
timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */
|
2011-02-03 14:48:59 +01:00
|
|
|
timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
|
|
|
timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
|
2010-03-10 11:38:55 +01:00
|
|
|
if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) {
|
|
|
|
perror("settime");
|
|
|
|
fprintf(stderr, "Internal timer error: aborting\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* defined(__linux__) */
|
|
|
|
|
2011-02-04 22:01:32 +01:00
|
|
|
#if !defined(_WIN32)
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
static int unix_start_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
|
|
|
struct sigaction act;
|
|
|
|
|
|
|
|
/* timer signal */
|
|
|
|
sigfillset(&act.sa_mask);
|
|
|
|
act.sa_flags = 0;
|
|
|
|
act.sa_handler = host_alarm_handler;
|
|
|
|
|
|
|
|
sigaction(SIGALRM, &act, NULL);
|
2011-06-09 13:10:25 +02:00
|
|
|
return 0;
|
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
|
2011-03-14 09:45:38 +01:00
|
|
|
static void unix_rearm_timer(struct qemu_alarm_timer *t,
|
|
|
|
int64_t nearest_delta_ns)
|
2011-06-09 13:10:25 +02:00
|
|
|
{
|
|
|
|
struct itimerval itv;
|
|
|
|
int err;
|
2010-03-10 11:38:55 +01:00
|
|
|
|
2011-06-09 13:10:25 +02:00
|
|
|
if (nearest_delta_ns < MIN_TIMER_REARM_NS)
|
|
|
|
nearest_delta_ns = MIN_TIMER_REARM_NS;
|
|
|
|
|
|
|
|
itv.it_interval.tv_sec = 0;
|
|
|
|
itv.it_interval.tv_usec = 0; /* 0 for one-shot timer */
|
|
|
|
itv.it_value.tv_sec = nearest_delta_ns / 1000000000;
|
|
|
|
itv.it_value.tv_usec = (nearest_delta_ns % 1000000000) / 1000;
|
|
|
|
err = setitimer(ITIMER_REAL, &itv, NULL);
|
|
|
|
if (err) {
|
|
|
|
perror("setitimer");
|
|
|
|
fprintf(stderr, "Internal timer error: aborting\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
static void unix_stop_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
|
|
|
struct itimerval itv;
|
|
|
|
|
|
|
|
memset(&itv, 0, sizeof(itv));
|
|
|
|
setitimer(ITIMER_REAL, &itv, NULL);
|
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* !defined(_WIN32) */
|
|
|
|
|
|
|
|
|
|
|
|
#ifdef _WIN32
|
|
|
|
|
2011-04-05 18:34:21 +02:00
|
|
|
static MMRESULT mm_timer;
|
2012-04-27 07:34:40 +02:00
|
|
|
static TIMECAPS mm_tc;
|
2011-04-05 18:34:21 +02:00
|
|
|
|
|
|
|
static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg,
|
|
|
|
DWORD_PTR dwUser, DWORD_PTR dw1,
|
|
|
|
DWORD_PTR dw2)
|
|
|
|
{
|
|
|
|
struct qemu_alarm_timer *t = alarm_timer;
|
|
|
|
if (!t) {
|
|
|
|
return;
|
|
|
|
}
|
2012-04-20 11:27:24 +02:00
|
|
|
t->expired = true;
|
|
|
|
t->pending = true;
|
|
|
|
qemu_notify_event();
|
2011-04-05 18:34:21 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
static int mm_start_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
2012-04-27 07:34:40 +02:00
|
|
|
timeGetDevCaps(&mm_tc, sizeof(mm_tc));
|
2011-04-05 18:34:21 +02:00
|
|
|
|
2012-04-27 07:34:40 +02:00
|
|
|
timeBeginPeriod(mm_tc.wPeriodMin);
|
2011-04-05 18:34:21 +02:00
|
|
|
|
2012-04-27 07:34:40 +02:00
|
|
|
mm_timer = timeSetEvent(mm_tc.wPeriodMin, /* interval (ms) */
|
|
|
|
mm_tc.wPeriodMin, /* resolution */
|
2011-04-05 18:34:21 +02:00
|
|
|
mm_alarm_handler, /* function */
|
|
|
|
(DWORD_PTR)t, /* parameter */
|
2012-04-20 11:27:24 +02:00
|
|
|
TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
|
2011-04-05 18:34:21 +02:00
|
|
|
|
|
|
|
if (!mm_timer) {
|
2012-05-08 19:14:43 +02:00
|
|
|
fprintf(stderr, "Failed to initialize win32 alarm timer\n");
|
2012-04-27 07:34:40 +02:00
|
|
|
timeEndPeriod(mm_tc.wPeriodMin);
|
2011-04-05 18:34:21 +02:00
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void mm_stop_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
|
|
|
timeKillEvent(mm_timer);
|
2012-04-27 07:34:40 +02:00
|
|
|
timeEndPeriod(mm_tc.wPeriodMin);
|
2011-04-05 18:34:21 +02:00
|
|
|
}
|
|
|
|
|
2011-03-14 09:45:38 +01:00
|
|
|
static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta)
|
2011-04-05 18:34:21 +02:00
|
|
|
{
|
2012-04-13 20:35:02 +02:00
|
|
|
int64_t nearest_delta_ms = delta / 1000000;
|
2012-04-27 07:34:40 +02:00
|
|
|
if (nearest_delta_ms < mm_tc.wPeriodMin) {
|
|
|
|
nearest_delta_ms = mm_tc.wPeriodMin;
|
|
|
|
} else if (nearest_delta_ms > mm_tc.wPeriodMax) {
|
|
|
|
nearest_delta_ms = mm_tc.wPeriodMax;
|
2012-04-13 20:35:02 +02:00
|
|
|
}
|
2011-03-14 09:45:38 +01:00
|
|
|
|
|
|
|
timeKillEvent(mm_timer);
|
2012-04-27 07:34:40 +02:00
|
|
|
mm_timer = timeSetEvent((UINT)nearest_delta_ms,
|
|
|
|
mm_tc.wPeriodMin,
|
2011-04-05 18:34:21 +02:00
|
|
|
mm_alarm_handler,
|
|
|
|
(DWORD_PTR)t,
|
|
|
|
TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
|
|
|
|
|
|
|
|
if (!mm_timer) {
|
2012-05-08 19:14:43 +02:00
|
|
|
fprintf(stderr, "Failed to re-arm win32 alarm timer\n");
|
2012-04-27 07:34:40 +02:00
|
|
|
timeEndPeriod(mm_tc.wPeriodMin);
|
2011-04-05 18:34:21 +02:00
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
static int win32_start_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
2011-03-12 17:43:50 +01:00
|
|
|
HANDLE hTimer;
|
|
|
|
BOOLEAN success;
|
|
|
|
|
|
|
|
/* If you call ChangeTimerQueueTimer on a one-shot timer (its period
|
|
|
|
is zero) that has already expired, the timer is not updated. Since
|
|
|
|
creating a new timer is relatively expensive, set a bogus one-hour
|
|
|
|
interval in the dynticks case. */
|
|
|
|
success = CreateTimerQueueTimer(&hTimer,
|
|
|
|
NULL,
|
|
|
|
host_alarm_handler,
|
|
|
|
t,
|
|
|
|
1,
|
2012-04-20 11:27:24 +02:00
|
|
|
3600000,
|
2011-03-12 17:43:50 +01:00
|
|
|
WT_EXECUTEINTIMERTHREAD);
|
|
|
|
|
|
|
|
if (!success) {
|
2010-03-10 11:38:55 +01:00
|
|
|
fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
|
|
|
|
GetLastError());
|
|
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
2011-04-10 20:15:09 +02:00
|
|
|
t->timer = hTimer;
|
2010-03-10 11:38:55 +01:00
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void win32_stop_timer(struct qemu_alarm_timer *t)
|
|
|
|
{
|
2011-04-10 20:15:09 +02:00
|
|
|
HANDLE hTimer = t->timer;
|
2010-03-10 11:38:55 +01:00
|
|
|
|
2011-03-12 17:43:50 +01:00
|
|
|
if (hTimer) {
|
|
|
|
DeleteTimerQueueTimer(NULL, hTimer, NULL);
|
|
|
|
}
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
2011-03-14 09:45:38 +01:00
|
|
|
static void win32_rearm_timer(struct qemu_alarm_timer *t,
|
|
|
|
int64_t nearest_delta_ns)
|
2010-03-10 11:38:55 +01:00
|
|
|
{
|
2011-04-10 20:15:09 +02:00
|
|
|
HANDLE hTimer = t->timer;
|
2012-04-13 20:35:02 +02:00
|
|
|
int64_t nearest_delta_ms;
|
2011-03-12 17:43:50 +01:00
|
|
|
BOOLEAN success;
|
2010-03-10 11:38:55 +01:00
|
|
|
|
2012-04-13 20:35:02 +02:00
|
|
|
nearest_delta_ms = nearest_delta_ns / 1000000;
|
2011-03-12 17:43:49 +01:00
|
|
|
if (nearest_delta_ms < 1) {
|
|
|
|
nearest_delta_ms = 1;
|
|
|
|
}
|
2012-04-13 20:35:02 +02:00
|
|
|
/* ULONG_MAX can be 32 bit */
|
|
|
|
if (nearest_delta_ms > ULONG_MAX) {
|
|
|
|
nearest_delta_ms = ULONG_MAX;
|
|
|
|
}
|
2011-03-12 17:43:50 +01:00
|
|
|
success = ChangeTimerQueueTimer(NULL,
|
|
|
|
hTimer,
|
2012-04-13 20:35:02 +02:00
|
|
|
(unsigned long) nearest_delta_ms,
|
2011-03-12 17:43:50 +01:00
|
|
|
3600000);
|
2010-03-10 11:38:55 +01:00
|
|
|
|
2011-03-12 17:43:50 +01:00
|
|
|
if (!success) {
|
|
|
|
fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
|
|
|
|
GetLastError());
|
|
|
|
exit(-1);
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
2011-03-12 17:43:50 +01:00
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
}
|
|
|
|
|
|
|
|
#endif /* _WIN32 */
|
|
|
|
|
2011-09-19 10:18:51 +02:00
|
|
|
static void quit_timers(void)
|
|
|
|
{
|
|
|
|
struct qemu_alarm_timer *t = alarm_timer;
|
|
|
|
alarm_timer = NULL;
|
|
|
|
t->stop(t);
|
|
|
|
}
|
|
|
|
|
2012-11-02 15:43:22 +01:00
|
|
|
static void reinit_timers(void)
|
|
|
|
{
|
|
|
|
struct qemu_alarm_timer *t = alarm_timer;
|
|
|
|
t->stop(t);
|
|
|
|
if (t->start(t)) {
|
|
|
|
fprintf(stderr, "Internal timer error: aborting\n");
|
|
|
|
exit(1);
|
|
|
|
}
|
|
|
|
qemu_rearm_alarm_timer(t);
|
|
|
|
}
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
int init_timer_alarm(void)
|
|
|
|
{
|
|
|
|
struct qemu_alarm_timer *t = NULL;
|
|
|
|
int i, err = -1;
|
|
|
|
|
2012-10-29 15:26:28 +01:00
|
|
|
if (alarm_timer) {
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2010-03-10 11:38:55 +01:00
|
|
|
for (i = 0; alarm_timers[i].name; i++) {
|
|
|
|
t = &alarm_timers[i];
|
|
|
|
|
|
|
|
err = t->start(t);
|
|
|
|
if (!err)
|
|
|
|
break;
|
|
|
|
}
|
|
|
|
|
|
|
|
if (err) {
|
|
|
|
err = -ENOENT;
|
|
|
|
goto fail;
|
|
|
|
}
|
|
|
|
|
2011-09-19 10:18:51 +02:00
|
|
|
atexit(quit_timers);
|
2012-11-02 15:43:22 +01:00
|
|
|
#ifdef CONFIG_POSIX
|
|
|
|
pthread_atfork(NULL, NULL, reinit_timers);
|
|
|
|
#endif
|
2010-03-10 11:38:55 +01:00
|
|
|
alarm_timer = t;
|
|
|
|
return 0;
|
|
|
|
|
|
|
|
fail:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|