* THE SOFTWARE.
*/
-#include "sysemu.h"
-#include "net.h"
-#include "monitor.h"
-#include "console.h"
+#include "sysemu/sysemu.h"
+#include "monitor/monitor.h"
+#include "ui/console.h"
#include "hw/hw.h"
-#include "qemu-timer.h"
+#include "qemu/timer.h"
+#ifdef CONFIG_POSIX
+#include <pthread.h>
+#endif
#ifdef _WIN32
#include <mmsystem.h>
#endif
+#ifdef CONFIG_PPOLL
+#include <poll.h>
+#endif
+
+#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
+#include <sys/prctl.h>
+#endif
+
/***********************************************************/
/* timers */
-#define QEMU_CLOCK_REALTIME 0
-#define QEMU_CLOCK_VIRTUAL 1
-#define QEMU_CLOCK_HOST 2
-
struct QEMUClock {
- QEMUTimer *active_timers;
+ QEMUTimerList *main_loop_timerlist;
+ QLIST_HEAD(, QEMUTimerList) timerlists;
NotifierList reset_notifiers;
int64_t last;
- int type;
+ QEMUClockType type;
bool enabled;
};
-struct QEMUTimer {
- int64_t expire_time; /* in nanoseconds */
+QEMUTimerListGroup main_loop_tlg;
+QEMUClock *qemu_clocks[QEMU_CLOCK_MAX];
+
+/* A QEMUTimerList is a list of timers attached to a clock. More
+ * than one QEMUTimerList can be attached to each clock, for instance
+ * used by different AioContexts / threads. Each clock also has
+ * a list of the QEMUTimerLists associated with it, in order that
+ * reenabling the clock can call all the notifiers.
+ */
+
+struct QEMUTimerList {
QEMUClock *clock;
- QEMUTimerCB *cb;
- void *opaque;
- QEMUTimer *next;
- int scale;
+ QEMUTimer *active_timers;
+ QLIST_ENTRY(QEMUTimerList) list;
+ QEMUTimerListNotifyCB *notify_cb;
+ void *notify_opaque;
};
struct qemu_alarm_timer {
static struct qemu_alarm_timer *alarm_timer;
-static bool qemu_timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
+static bool timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
{
return timer_head && (timer_head->expire_time <= current_time);
}
{
int64_t delta = INT64_MAX;
int64_t rtdelta;
+ int64_t hdelta;
- if (!use_icount && vm_clock->enabled && vm_clock->active_timers) {
- delta = vm_clock->active_timers->expire_time -
- qemu_get_clock_ns(vm_clock);
+ if (!use_icount && vm_clock->enabled &&
+ vm_clock->main_loop_timerlist->active_timers) {
+ delta = vm_clock->main_loop_timerlist->active_timers->expire_time -
+ qemu_get_clock_ns(vm_clock);
}
- if (host_clock->enabled && host_clock->active_timers) {
- int64_t hdelta = host_clock->active_timers->expire_time -
- qemu_get_clock_ns(host_clock);
+ if (host_clock->enabled &&
+ host_clock->main_loop_timerlist->active_timers) {
+ hdelta = host_clock->main_loop_timerlist->active_timers->expire_time -
+ qemu_get_clock_ns(host_clock);
if (hdelta < delta) {
delta = hdelta;
}
}
- if (rt_clock->enabled && rt_clock->active_timers) {
- rtdelta = (rt_clock->active_timers->expire_time -
- qemu_get_clock_ns(rt_clock));
+ if (rt_clock->enabled &&
+ rt_clock->main_loop_timerlist->active_timers) {
+ rtdelta = (rt_clock->main_loop_timerlist->active_timers->expire_time -
+ qemu_get_clock_ns(rt_clock));
if (rtdelta < delta) {
delta = rtdelta;
}
}
}
-QEMUClock *rt_clock;
-QEMUClock *vm_clock;
-QEMUClock *host_clock;
+static QEMUTimerList *timerlist_new_from_clock(QEMUClock *clock,
+ QEMUTimerListNotifyCB *cb,
+ void *opaque)
+{
+ QEMUTimerList *timer_list;
+
+ /* Assert if we do not have a clock. If you see this
+ * assertion in means that the clocks have not been
+ * initialised before a timerlist is needed. This
+ * normally happens if an AioContext is used before
+ * init_clocks() is called within main().
+ */
+ assert(clock);
+
+ timer_list = g_malloc0(sizeof(QEMUTimerList));
+ timer_list->clock = clock;
+ timer_list->notify_cb = cb;
+ timer_list->notify_opaque = opaque;
+ QLIST_INSERT_HEAD(&clock->timerlists, timer_list, list);
+ return timer_list;
+}
+
+QEMUTimerList *timerlist_new(QEMUClockType type,
+ QEMUTimerListNotifyCB *cb, void *opaque)
+{
+ return timerlist_new_from_clock(qemu_clock_ptr(type), cb, opaque);
+}
+
+void timerlist_free(QEMUTimerList *timer_list)
+{
+ assert(!timerlist_has_timers(timer_list));
+ if (timer_list->clock) {
+ QLIST_REMOVE(timer_list, list);
+ if (timer_list->clock->main_loop_timerlist == timer_list) {
+ timer_list->clock->main_loop_timerlist = NULL;
+ }
+ }
+ g_free(timer_list);
+}
-static QEMUClock *qemu_new_clock(int type)
+static QEMUClock *qemu_clock_new(QEMUClockType type)
{
QEMUClock *clock;
clock->type = type;
clock->enabled = true;
clock->last = INT64_MIN;
+ QLIST_INIT(&clock->timerlists);
notifier_list_init(&clock->reset_notifiers);
+ clock->main_loop_timerlist = timerlist_new_from_clock(clock, NULL, NULL);
return clock;
}
+bool qemu_clock_use_for_deadline(QEMUClock *clock)
+{
+ return !(use_icount && (clock->type == QEMU_CLOCK_VIRTUAL));
+}
+
+void qemu_clock_notify(QEMUClock *clock)
+{
+ QEMUTimerList *timer_list;
+ QLIST_FOREACH(timer_list, &clock->timerlists, list) {
+ timerlist_notify(timer_list);
+ }
+}
+
void qemu_clock_enable(QEMUClock *clock, bool enabled)
{
bool old = clock->enabled;
clock->enabled = enabled;
if (enabled && !old) {
+ qemu_clock_notify(clock);
qemu_rearm_alarm_timer(alarm_timer);
}
}
-int64_t qemu_clock_has_timers(QEMUClock *clock)
+bool timerlist_has_timers(QEMUTimerList *timer_list)
{
- return !!clock->active_timers;
+ return !!timer_list->active_timers;
}
-int64_t qemu_clock_expired(QEMUClock *clock)
+bool qemu_clock_has_timers(QEMUClock *clock)
{
- return (clock->active_timers &&
- clock->active_timers->expire_time < qemu_get_clock_ns(clock));
+ return timerlist_has_timers(clock->main_loop_timerlist);
}
-int64_t qemu_clock_deadline(QEMUClock *clock)
+bool timerlist_expired(QEMUTimerList *timer_list)
+{
+ return (timer_list->active_timers &&
+ timer_list->active_timers->expire_time <
+ qemu_get_clock_ns(timer_list->clock));
+}
+
+bool qemu_clock_expired(QEMUClock *clock)
+{
+ return timerlist_expired(clock->main_loop_timerlist);
+}
+
+int64_t timerlist_deadline(QEMUTimerList *timer_list)
{
/* To avoid problems with overflow limit this to 2^32. */
int64_t delta = INT32_MAX;
- if (clock->active_timers) {
- delta = clock->active_timers->expire_time - qemu_get_clock_ns(clock);
+ if (timer_list->clock->enabled && timer_list->active_timers) {
+ delta = timer_list->active_timers->expire_time -
+ qemu_get_clock_ns(timer_list->clock);
}
if (delta < 0) {
delta = 0;
return delta;
}
-QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
- QEMUTimerCB *cb, void *opaque)
+int64_t qemu_clock_deadline(QEMUClock *clock)
{
- QEMUTimer *ts;
+ return timerlist_deadline(clock->main_loop_timerlist);
+}
+
+/*
+ * As above, but return -1 for no deadline, and do not cap to 2^32
+ * as we know the result is always positive.
+ */
+
+int64_t timerlist_deadline_ns(QEMUTimerList *timer_list)
+{
+ int64_t delta;
+
+ if (!timer_list->clock->enabled || !timer_list->active_timers) {
+ return -1;
+ }
+
+ delta = timer_list->active_timers->expire_time -
+ qemu_get_clock_ns(timer_list->clock);
+
+ if (delta <= 0) {
+ return 0;
+ }
+
+ return delta;
+}
+
+int64_t qemu_clock_deadline_ns(QEMUClock *clock)
+{
+ return timerlist_deadline_ns(clock->main_loop_timerlist);
+}
+
+QEMUClock *timerlist_get_clock(QEMUTimerList *timer_list)
+{
+ return timer_list->clock;
+}
+
+QEMUTimerList *qemu_clock_get_main_loop_timerlist(QEMUClock *clock)
+{
+ return clock->main_loop_timerlist;
+}
+
+void timerlist_notify(QEMUTimerList *timer_list)
+{
+ if (timer_list->notify_cb) {
+ timer_list->notify_cb(timer_list->notify_opaque);
+ } else {
+ qemu_notify_event();
+ }
+}
+
+/* Transition function to convert a nanosecond timeout to ms
+ * This is used where a system does not support ppoll
+ */
+int qemu_timeout_ns_to_ms(int64_t ns)
+{
+ int64_t ms;
+ if (ns < 0) {
+ return -1;
+ }
+
+ if (!ns) {
+ return 0;
+ }
+
+ /* Always round up, because it's better to wait too long than to wait too
+ * little and effectively busy-wait
+ */
+ ms = (ns + SCALE_MS - 1) / SCALE_MS;
+
+ /* To avoid overflow problems, limit this to 2^31, i.e. approx 25 days */
+ if (ms > (int64_t) INT32_MAX) {
+ ms = INT32_MAX;
+ }
+
+ return (int) ms;
+}
+
+
+/* qemu implementation of g_poll which uses a nanosecond timeout but is
+ * otherwise identical to g_poll
+ */
+int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
+{
+#ifdef CONFIG_PPOLL
+ if (timeout < 0) {
+ return ppoll((struct pollfd *)fds, nfds, NULL, NULL);
+ } else {
+ struct timespec ts;
+ ts.tv_sec = timeout / 1000000000LL;
+ ts.tv_nsec = timeout % 1000000000LL;
+ return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
+ }
+#else
+ return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
+#endif
+}
- ts = g_malloc0(sizeof(QEMUTimer));
- ts->clock = clock;
+
+void timer_init(QEMUTimer *ts,
+ QEMUTimerList *timer_list, int scale,
+ QEMUTimerCB *cb, void *opaque)
+{
+ ts->timer_list = timer_list;
ts->cb = cb;
ts->opaque = opaque;
ts->scale = scale;
- return ts;
+}
+
+QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
+ QEMUTimerCB *cb, void *opaque)
+{
+ return timer_new_tl(clock->main_loop_timerlist,
+ scale, cb, opaque);
}
void qemu_free_timer(QEMUTimer *ts)
QEMUTimer **pt, *t;
/* NOTE: this code must be signal safe because
- qemu_timer_expired() can be called from a signal. */
- pt = &ts->clock->active_timers;
+ timer_expired() can be called from a signal. */
+ pt = &ts->timer_list->active_timers;
for(;;) {
t = *pt;
if (!t)
/* add the timer in the sorted list */
/* NOTE: this code must be signal safe because
- qemu_timer_expired() can be called from a signal. */
- pt = &ts->clock->active_timers;
+ timer_expired() can be called from a signal. */
+ pt = &ts->timer_list->active_timers;
for(;;) {
t = *pt;
- if (!qemu_timer_expired_ns(t, expire_time)) {
+ if (!timer_expired_ns(t, expire_time)) {
break;
}
pt = &t->next;
*pt = ts;
/* Rearm if necessary */
- if (pt == &ts->clock->active_timers) {
+ if (pt == &ts->timer_list->active_timers) {
if (!alarm_timer->pending) {
qemu_rearm_alarm_timer(alarm_timer);
}
/* Interrupt execution to force deadline recalculation. */
- qemu_clock_warp(ts->clock);
- if (use_icount) {
- qemu_notify_event();
- }
+ qemu_clock_warp(ts->timer_list->clock);
+ timerlist_notify(ts->timer_list);
}
}
qemu_mod_timer_ns(ts, expire_time * ts->scale);
}
-bool qemu_timer_pending(QEMUTimer *ts)
+bool timer_pending(QEMUTimer *ts)
{
QEMUTimer *t;
- for (t = ts->clock->active_timers; t != NULL; t = t->next) {
+ for (t = ts->timer_list->active_timers; t != NULL; t = t->next) {
if (t == ts) {
return true;
}
return false;
}
-bool qemu_timer_expired(QEMUTimer *timer_head, int64_t current_time)
+bool timer_expired(QEMUTimer *timer_head, int64_t current_time)
{
- return qemu_timer_expired_ns(timer_head, current_time * timer_head->scale);
+ return timer_expired_ns(timer_head, current_time * timer_head->scale);
}
-void qemu_run_timers(QEMUClock *clock)
+bool timerlist_run_timers(QEMUTimerList *timer_list)
{
QEMUTimer *ts;
int64_t current_time;
+ bool progress = false;
- if (!clock->enabled)
- return;
+ if (!timer_list->clock->enabled) {
+ return progress;
+ }
- current_time = qemu_get_clock_ns(clock);
+ current_time = qemu_get_clock_ns(timer_list->clock);
for(;;) {
- ts = clock->active_timers;
- if (!qemu_timer_expired_ns(ts, current_time)) {
+ ts = timer_list->active_timers;
+ if (!timer_expired_ns(ts, current_time)) {
break;
}
/* remove timer from the list before calling the callback */
- clock->active_timers = ts->next;
+ timer_list->active_timers = ts->next;
ts->next = NULL;
/* run the callback (the timer list can be modified) */
ts->cb(ts->opaque);
+ progress = true;
}
+ return progress;
+}
+
+bool qemu_run_timers(QEMUClock *clock)
+{
+ return timerlist_run_timers(clock->main_loop_timerlist);
+}
+
+void timerlistgroup_init(QEMUTimerListGroup *tlg,
+ QEMUTimerListNotifyCB *cb, void *opaque)
+{
+ QEMUClockType type;
+ for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+ tlg->tl[type] = timerlist_new(type, cb, opaque);
+ }
+}
+
+void timerlistgroup_deinit(QEMUTimerListGroup *tlg)
+{
+ QEMUClockType type;
+ for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+ timerlist_free(tlg->tl[type]);
+ }
+}
+
+bool timerlistgroup_run_timers(QEMUTimerListGroup *tlg)
+{
+ QEMUClockType type;
+ bool progress = false;
+ for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+ progress |= timerlist_run_timers(tlg->tl[type]);
+ }
+ return progress;
+}
+
+int64_t timerlistgroup_deadline_ns(QEMUTimerListGroup *tlg)
+{
+ int64_t deadline = -1;
+ QEMUClockType type;
+ for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+ if (qemu_clock_use_for_deadline(tlg->tl[type]->clock)) {
+ deadline = qemu_soonest_timeout(deadline,
+ timerlist_deadline_ns(
+ tlg->tl[type]));
+ }
+ }
+ return deadline;
}
int64_t qemu_get_clock_ns(QEMUClock *clock)
void init_clocks(void)
{
- 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);
+ QEMUClockType type;
+ for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+ if (!qemu_clocks[type]) {
+ qemu_clocks[type] = qemu_clock_new(type);
+ main_loop_tlg.tl[type] = qemu_clocks[type]->main_loop_timerlist;
+ }
}
+
+#ifdef CONFIG_PRCTL_PR_SET_TIMERSLACK
+ prctl(PR_SET_TIMERSLACK, 1, 0, 0, 0);
+#endif
}
-uint64_t qemu_timer_expire_time_ns(QEMUTimer *ts)
+uint64_t timer_expire_time_ns(QEMUTimer *ts)
{
- return qemu_timer_pending(ts) ? ts->expire_time : -1;
+ return timer_pending(ts) ? ts->expire_time : -1;
}
-void qemu_run_all_timers(void)
+bool qemu_run_all_timers(void)
{
+ bool progress = false;
alarm_timer->pending = false;
/* vm time timers */
- qemu_run_timers(vm_clock);
- qemu_run_timers(rt_clock);
- qemu_run_timers(host_clock);
+ QEMUClockType type;
+ for (type = 0; type < QEMU_CLOCK_MAX; type++) {
+ progress |= qemu_run_timers(qemu_clock_ptr(type));
+ }
/* rearm timer, if not periodic */
if (alarm_timer->expired) {
alarm_timer->expired = false;
qemu_rearm_alarm_timer(alarm_timer);
}
+
+ return progress;
}
#ifdef _WIN32
#if defined(__linux__)
-#include "compatfd.h"
+#include "qemu/compatfd.h"
static int dynticks_start_timer(struct qemu_alarm_timer *t)
{
memset(&ev, 0, sizeof(ev));
ev.sigev_value.sival_int = 0;
ev.sigev_notify = SIGEV_SIGNAL;
-#ifdef SIGEV_THREAD_ID
+#ifdef CONFIG_SIGEV_THREAD_ID
if (qemu_signalfd_available()) {
ev.sigev_notify = SIGEV_THREAD_ID;
ev._sigev_un._tid = qemu_get_thread_id();
}
-#endif /* SIGEV_THREAD_ID */
+#endif /* CONFIG_SIGEV_THREAD_ID */
ev.sigev_signo = SIGALRM;
if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
static int mm_start_timer(struct qemu_alarm_timer *t)
{
timeGetDevCaps(&mm_tc, sizeof(mm_tc));
-
- timeBeginPeriod(mm_tc.wPeriodMin);
-
- mm_timer = timeSetEvent(mm_tc.wPeriodMin, /* interval (ms) */
- mm_tc.wPeriodMin, /* resolution */
- mm_alarm_handler, /* function */
- (DWORD_PTR)t, /* parameter */
- TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
-
- if (!mm_timer) {
- fprintf(stderr, "Failed to initialize win32 alarm timer\n");
- timeEndPeriod(mm_tc.wPeriodMin);
- return -1;
- }
-
return 0;
}
static void mm_stop_timer(struct qemu_alarm_timer *t)
{
- timeKillEvent(mm_timer);
- timeEndPeriod(mm_tc.wPeriodMin);
+ if (mm_timer) {
+ timeKillEvent(mm_timer);
+ }
}
static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta)
nearest_delta_ms = mm_tc.wPeriodMax;
}
- timeKillEvent(mm_timer);
+ if (mm_timer) {
+ timeKillEvent(mm_timer);
+ }
mm_timer = timeSetEvent((UINT)nearest_delta_ms,
mm_tc.wPeriodMin,
mm_alarm_handler,
t->stop(t);
}
+#ifdef CONFIG_POSIX
+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);
+}
+#endif /* CONFIG_POSIX */
+
int init_timer_alarm(void)
{
struct qemu_alarm_timer *t = NULL;
}
atexit(quit_timers);
+#ifdef CONFIG_POSIX
+ pthread_atfork(NULL, NULL, reinit_timers);
+#endif
alarm_timer = t;
return 0;
projects / qemu.git / blobdiff