* 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 <unistd.h>
-#include <fcntl.h>
-#include <time.h>
-#include <errno.h>
-#include <sys/time.h>
-#include <signal.h>
-#ifdef __FreeBSD__
-#include <sys/param.h>
+#include "qemu/timer.h"
+#ifdef CONFIG_POSIX
+#include <pthread.h>
#endif
#ifdef _WIN32
-#include <windows.h>
#include <mmsystem.h>
#endif
-#include "qemu-timer.h"
+#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 {
- int type;
- int enabled;
-
QEMUTimer *active_timers;
NotifierList reset_notifiers;
int64_t last;
+
+ int type;
+ bool enabled;
};
struct QEMUTimer {
- QEMUClock *clock;
int64_t expire_time; /* in nanoseconds */
- int scale;
+ QEMUClock *clock;
QEMUTimerCB *cb;
void *opaque;
- struct QEMUTimer *next;
+ QEMUTimer *next;
+ int scale;
};
struct qemu_alarm_timer {
void (*stop)(struct qemu_alarm_timer *t);
void (*rearm)(struct qemu_alarm_timer *t, int64_t nearest_delta_ns);
#if defined(__linux__)
- int fd;
timer_t timer;
+ int fd;
#elif defined(_WIN32)
HANDLE timer;
#endif
- char expired;
- char pending;
+ bool expired;
+ bool pending;
};
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);
}
-int qemu_alarm_pending(void)
-{
- return alarm_timer->pending;
-}
-
-static inline int alarm_has_dynticks(struct qemu_alarm_timer *t)
-{
- return !!t->rearm;
-}
-
static int64_t qemu_next_alarm_deadline(void)
{
- int64_t delta;
+ int64_t delta = INT64_MAX;
int64_t rtdelta;
- if (!use_icount && vm_clock->active_timers) {
+ if (!use_icount && vm_clock->enabled && vm_clock->active_timers) {
delta = vm_clock->active_timers->expire_time -
qemu_get_clock_ns(vm_clock);
- } else {
- delta = INT32_MAX;
}
- if (host_clock->active_timers) {
+ if (host_clock->enabled && host_clock->active_timers) {
int64_t hdelta = host_clock->active_timers->expire_time -
qemu_get_clock_ns(host_clock);
if (hdelta < delta) {
delta = hdelta;
}
}
- if (rt_clock->active_timers) {
+ if (rt_clock->enabled && rt_clock->active_timers) {
rtdelta = (rt_clock->active_timers->expire_time -
qemu_get_clock_ns(rt_clock));
if (rtdelta < delta) {
static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
{
- int64_t nearest_delta_ns;
- assert(alarm_has_dynticks(t));
- if (!rt_clock->active_timers &&
- !vm_clock->active_timers &&
- !host_clock->active_timers) {
- return;
+ int64_t nearest_delta_ns = qemu_next_alarm_deadline();
+ if (nearest_delta_ns < INT64_MAX) {
+ t->rearm(t, nearest_delta_ns);
}
- nearest_delta_ns = qemu_next_alarm_deadline();
- t->rearm(t, nearest_delta_ns);
}
/* TODO: MIN_TIMER_REARM_NS should be optimized */
char *name;
struct qemu_alarm_timer tmp;
- if (!strcmp(opt, "?")) {
+ if (is_help_option(opt)) {
show_available_alarms();
exit(0);
}
QEMUClock *vm_clock;
QEMUClock *host_clock;
-static QEMUClock *qemu_new_clock(int type)
+static QEMUClock *qemu_clock_new(int type)
{
QEMUClock *clock;
clock = g_malloc0(sizeof(QEMUClock));
clock->type = type;
- clock->enabled = 1;
+ clock->enabled = true;
clock->last = INT64_MIN;
notifier_list_init(&clock->reset_notifiers);
return clock;
}
-void qemu_clock_enable(QEMUClock *clock, int enabled)
+void qemu_clock_enable(QEMUClock *clock, bool enabled)
{
bool old = clock->enabled;
clock->enabled = enabled;
/* To avoid problems with overflow limit this to 2^32. */
int64_t delta = INT32_MAX;
- if (clock->active_timers) {
+ if (clock->enabled && clock->active_timers) {
delta = clock->active_timers->expire_time - qemu_get_clock_ns(clock);
}
if (delta < 0) {
return delta;
}
+/*
+ * 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 qemu_clock_deadline_ns(QEMUClock *clock)
+{
+ int64_t delta;
+
+ if (!clock->enabled || !clock->active_timers) {
+ return -1;
+ }
+
+ delta = clock->active_timers->expire_time - qemu_get_clock_ns(clock);
+
+ if (delta <= 0) {
+ return 0;
+ }
+
+ return delta;
+}
+
+/* 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
+}
+
+
QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
QEMUTimerCB *cb, void *opaque)
{
QEMUTimer **pt, *t;
/* NOTE: this code must be signal safe because
- qemu_timer_expired() can be called from a signal. */
+ timer_expired() can be called from a signal. */
pt = &ts->clock->active_timers;
for(;;) {
t = *pt;
/* add the timer in the sorted list */
/* NOTE: this code must be signal safe because
- qemu_timer_expired() can be called from a signal. */
+ timer_expired() can be called from a signal. */
pt = &ts->clock->active_timers;
for(;;) {
t = *pt;
- if (!qemu_timer_expired_ns(t, expire_time)) {
+ if (!timer_expired_ns(t, expire_time)) {
break;
}
pt = &t->next;
qemu_mod_timer_ns(ts, expire_time * ts->scale);
}
-int qemu_timer_pending(QEMUTimer *ts)
+bool timer_pending(QEMUTimer *ts)
{
QEMUTimer *t;
for (t = ts->clock->active_timers; t != NULL; t = t->next) {
- if (t == ts)
- return 1;
+ if (t == ts) {
+ return true;
+ }
}
- return 0;
+ return false;
}
-int 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)
{
- QEMUTimer **ptimer_head, *ts;
+ QEMUTimer *ts;
int64_t current_time;
if (!clock->enabled)
return;
current_time = qemu_get_clock_ns(clock);
- ptimer_head = &clock->active_timers;
for(;;) {
- ts = *ptimer_head;
- if (!qemu_timer_expired_ns(ts, current_time)) {
+ ts = clock->active_timers;
+ if (!timer_expired_ns(ts, current_time)) {
break;
}
/* remove timer from the list before calling the callback */
- *ptimer_head = ts->next;
+ clock->active_timers = ts->next;
ts->next = NULL;
/* run the callback (the timer list can be modified) */
void init_clocks(void)
{
- rt_clock = qemu_new_clock(QEMU_CLOCK_REALTIME);
- vm_clock = qemu_new_clock(QEMU_CLOCK_VIRTUAL);
- host_clock = qemu_new_clock(QEMU_CLOCK_HOST);
+ if (!rt_clock) {
+ rt_clock = qemu_clock_new(QEMU_CLOCK_REALTIME);
+ vm_clock = qemu_clock_new(QEMU_CLOCK_VIRTUAL);
+ host_clock = qemu_clock_new(QEMU_CLOCK_HOST);
+ }
+#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)
{
- alarm_timer->pending = 0;
+ alarm_timer->pending = false;
/* vm time timers */
qemu_run_timers(vm_clock);
/* rearm timer, if not periodic */
if (alarm_timer->expired) {
- alarm_timer->expired = 0;
+ alarm_timer->expired = false;
qemu_rearm_alarm_timer(alarm_timer);
}
}
if (!t)
return;
- if (alarm_has_dynticks(t) ||
- qemu_next_alarm_deadline () <= 0) {
- t->expired = alarm_has_dynticks(t);
- t->pending = 1;
- qemu_notify_event();
- }
+ t->expired = true;
+ t->pending = true;
+ qemu_notify_event();
}
#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)) {
perror("timer_create");
-
- /* disable dynticks */
- fprintf(stderr, "Dynamic Ticks disabled\n");
-
return -1;
}
#ifdef _WIN32
static MMRESULT mm_timer;
-static unsigned mm_period;
+static TIMECAPS mm_tc;
static void CALLBACK mm_alarm_handler(UINT uTimerID, UINT uMsg,
DWORD_PTR dwUser, DWORD_PTR dw1,
if (!t) {
return;
}
- if (alarm_has_dynticks(t) || qemu_next_alarm_deadline() <= 0) {
- t->expired = alarm_has_dynticks(t);
- t->pending = 1;
- qemu_notify_event();
- }
+ t->expired = true;
+ t->pending = true;
+ qemu_notify_event();
}
static int mm_start_timer(struct qemu_alarm_timer *t)
{
- TIMECAPS tc;
- UINT flags;
-
- memset(&tc, 0, sizeof(tc));
- timeGetDevCaps(&tc, sizeof(tc));
-
- mm_period = tc.wPeriodMin;
- timeBeginPeriod(mm_period);
-
- flags = TIME_CALLBACK_FUNCTION;
- if (alarm_has_dynticks(t)) {
- flags |= TIME_ONESHOT;
- } else {
- flags |= TIME_PERIODIC;
- }
-
- mm_timer = timeSetEvent(1, /* interval (ms) */
- mm_period, /* resolution */
- mm_alarm_handler, /* function */
- (DWORD_PTR)t, /* parameter */
- flags);
-
- if (!mm_timer) {
- fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
- GetLastError());
- timeEndPeriod(mm_period);
- return -1;
- }
-
+ timeGetDevCaps(&mm_tc, sizeof(mm_tc));
return 0;
}
static void mm_stop_timer(struct qemu_alarm_timer *t)
{
- timeKillEvent(mm_timer);
- timeEndPeriod(mm_period);
+ if (mm_timer) {
+ timeKillEvent(mm_timer);
+ }
}
static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta)
{
- int nearest_delta_ms = (delta + 999999) / 1000000;
- if (nearest_delta_ms < 1) {
- nearest_delta_ms = 1;
+ int64_t nearest_delta_ms = delta / 1000000;
+ 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;
}
- timeKillEvent(mm_timer);
- mm_timer = timeSetEvent(nearest_delta_ms,
- mm_period,
+ if (mm_timer) {
+ timeKillEvent(mm_timer);
+ }
+ mm_timer = timeSetEvent((UINT)nearest_delta_ms,
+ mm_tc.wPeriodMin,
mm_alarm_handler,
(DWORD_PTR)t,
TIME_ONESHOT | TIME_CALLBACK_FUNCTION);
if (!mm_timer) {
- fprintf(stderr, "Failed to re-arm win32 alarm timer %ld\n",
- GetLastError());
-
- timeEndPeriod(mm_period);
+ fprintf(stderr, "Failed to re-arm win32 alarm timer\n");
+ timeEndPeriod(mm_tc.wPeriodMin);
exit(1);
}
}
host_alarm_handler,
t,
1,
- alarm_has_dynticks(t) ? 3600000 : 1,
+ 3600000,
WT_EXECUTEINTIMERTHREAD);
if (!success) {
int64_t nearest_delta_ns)
{
HANDLE hTimer = t->timer;
- int nearest_delta_ms;
+ int64_t nearest_delta_ms;
BOOLEAN success;
- nearest_delta_ms = (nearest_delta_ns + 999999) / 1000000;
+ nearest_delta_ms = nearest_delta_ns / 1000000;
if (nearest_delta_ms < 1) {
nearest_delta_ms = 1;
}
+ /* ULONG_MAX can be 32 bit */
+ if (nearest_delta_ms > ULONG_MAX) {
+ nearest_delta_ms = ULONG_MAX;
+ }
success = ChangeTimerQueueTimer(NULL,
hTimer,
- nearest_delta_ms,
+ (unsigned long) nearest_delta_ms,
3600000);
if (!success) {
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;
int i, err = -1;
+ if (alarm_timer) {
+ return 0;
+ }
+
for (i = 0; alarm_timers[i].name; i++) {
t = &alarm_timers[i];
goto fail;
}
- /* first event is at time 0 */
atexit(quit_timers);
- t->pending = 1;
+#ifdef CONFIG_POSIX
+ pthread_atfork(NULL, NULL, reinit_timers);
+#endif
alarm_timer = t;
-
return 0;
fail:
return err;
}
-int qemu_calculate_timeout(void)
-{
- return 1000;
-}
-
projects / qemu.git / blobdiff