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Diffstat (limited to 'qemu-timer.c')
-rw-r--r--qemu-timer.c500
1 files changed, 1 insertions, 499 deletions
diff --git a/qemu-timer.c b/qemu-timer.c
index b56bfde706..8ea8211873 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -33,10 +33,6 @@
#include <pthread.h>
#endif
-#ifdef _WIN32
-#include <mmsystem.h>
-#endif
-
#ifdef CONFIG_PPOLL
#include <poll.h>
#endif
@@ -77,174 +73,11 @@ struct QEMUTimerList {
void *notify_opaque;
};
-struct qemu_alarm_timer {
- char const *name;
- int (*start)(struct qemu_alarm_timer *t);
- void (*stop)(struct qemu_alarm_timer *t);
- void (*rearm)(struct qemu_alarm_timer *t, int64_t nearest_delta_ns);
-#if defined(__linux__)
- timer_t timer;
- int fd;
-#elif defined(_WIN32)
- HANDLE timer;
-#endif
- bool expired;
- bool pending;
-};
-
-static struct qemu_alarm_timer *alarm_timer;
-
static bool timer_expired_ns(QEMUTimer *timer_head, int64_t current_time)
{
return timer_head && (timer_head->expire_time <= current_time);
}
-static int64_t qemu_next_alarm_deadline(void)
-{
- int64_t delta = INT64_MAX;
- int64_t rtdelta;
- int64_t hdelta;
-
- 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->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->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;
- }
- }
-
- return delta;
-}
-
-static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
-{
- int64_t nearest_delta_ns = qemu_next_alarm_deadline();
- if (nearest_delta_ns < INT64_MAX) {
- t->rearm(t, nearest_delta_ns);
- }
-}
-
-/* TODO: MIN_TIMER_REARM_NS should be optimized */
-#define MIN_TIMER_REARM_NS 250000
-
-#ifdef _WIN32
-
-static int mm_start_timer(struct qemu_alarm_timer *t);
-static void mm_stop_timer(struct qemu_alarm_timer *t);
-static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
-
-static int win32_start_timer(struct qemu_alarm_timer *t);
-static void win32_stop_timer(struct qemu_alarm_timer *t);
-static void win32_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
-
-#else
-
-static int unix_start_timer(struct qemu_alarm_timer *t);
-static void unix_stop_timer(struct qemu_alarm_timer *t);
-static void unix_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
-
-#ifdef __linux__
-
-static int dynticks_start_timer(struct qemu_alarm_timer *t);
-static void dynticks_stop_timer(struct qemu_alarm_timer *t);
-static void dynticks_rearm_timer(struct qemu_alarm_timer *t, int64_t delta);
-
-#endif /* __linux__ */
-
-#endif /* _WIN32 */
-
-static struct qemu_alarm_timer alarm_timers[] = {
-#ifndef _WIN32
-#ifdef __linux__
- {"dynticks", dynticks_start_timer,
- dynticks_stop_timer, dynticks_rearm_timer},
-#endif
- {"unix", unix_start_timer, unix_stop_timer, unix_rearm_timer},
-#else
- {"mmtimer", mm_start_timer, mm_stop_timer, mm_rearm_timer},
- {"dynticks", win32_start_timer, win32_stop_timer, win32_rearm_timer},
-#endif
- {NULL, }
-};
-
-static void show_available_alarms(void)
-{
- int i;
-
- printf("Available alarm timers, in order of precedence:\n");
- for (i = 0; alarm_timers[i].name; i++)
- printf("%s\n", alarm_timers[i].name);
-}
-
-void configure_alarms(char const *opt)
-{
- int i;
- int cur = 0;
- int count = ARRAY_SIZE(alarm_timers) - 1;
- char *arg;
- char *name;
- struct qemu_alarm_timer tmp;
-
- if (is_help_option(opt)) {
- show_available_alarms();
- exit(0);
- }
-
- arg = g_strdup(opt);
-
- /* Reorder the array */
- name = strtok(arg, ",");
- while (name) {
- for (i = 0; i < count && alarm_timers[i].name; i++) {
- if (!strcmp(alarm_timers[i].name, name))
- break;
- }
-
- if (i == count) {
- fprintf(stderr, "Unknown clock %s\n", name);
- goto next;
- }
-
- if (i < cur)
- /* Ignore */
- goto next;
-
- /* Swap */
- tmp = alarm_timers[i];
- alarm_timers[i] = alarm_timers[cur];
- alarm_timers[cur] = tmp;
-
- cur++;
-next:
- name = strtok(NULL, ",");
- }
-
- g_free(arg);
-
- if (cur) {
- /* Disable remaining timers */
- for (i = cur; i < count; i++)
- alarm_timers[i].name = NULL;
- } else {
- show_available_alarms();
- exit(1);
- }
-}
-
static QEMUTimerList *timerlist_new_from_clock(QEMUClock *clock,
QEMUTimerListNotifyCB *cb,
void *opaque)
@@ -318,7 +151,6 @@ void qemu_clock_enable(QEMUClock *clock, bool enabled)
clock->enabled = enabled;
if (enabled && !old) {
qemu_clock_notify(clock);
- qemu_rearm_alarm_timer(alarm_timer);
}
}
@@ -542,9 +374,6 @@ void qemu_mod_timer_ns(QEMUTimer *ts, int64_t expire_time)
/* Rearm if necessary */
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->timer_list->clock);
timerlist_notify(ts->timer_list);
@@ -703,338 +532,11 @@ uint64_t timer_expire_time_ns(QEMUTimer *ts)
bool qemu_run_all_timers(void)
{
bool progress = false;
- alarm_timer->pending = false;
-
- /* vm time timers */
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
-static void CALLBACK host_alarm_handler(PVOID lpParam, BOOLEAN unused)
-#else
-static void host_alarm_handler(int host_signum)
-#endif
-{
- struct qemu_alarm_timer *t = alarm_timer;
- if (!t)
- return;
-
- t->expired = true;
- t->pending = true;
- qemu_notify_event();
-}
-
-#if defined(__linux__)
-
-#include "qemu/compatfd.h"
-
-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;
-#ifdef CONFIG_SIGEV_THREAD_ID
- if (qemu_signalfd_available()) {
- ev.sigev_notify = SIGEV_THREAD_ID;
- ev._sigev_un._tid = qemu_get_thread_id();
- }
-#endif /* CONFIG_SIGEV_THREAD_ID */
- ev.sigev_signo = SIGALRM;
-
- if (timer_create(CLOCK_REALTIME, &ev, &host_timer)) {
- perror("timer_create");
- return -1;
- }
-
- t->timer = host_timer;
-
- return 0;
-}
-
-static void dynticks_stop_timer(struct qemu_alarm_timer *t)
-{
- timer_t host_timer = t->timer;
-
- timer_delete(host_timer);
-}
-
-static void dynticks_rearm_timer(struct qemu_alarm_timer *t,
- int64_t nearest_delta_ns)
-{
- timer_t host_timer = t->timer;
- struct itimerspec timeout;
- int64_t current_ns;
-
- if (nearest_delta_ns < MIN_TIMER_REARM_NS)
- nearest_delta_ns = MIN_TIMER_REARM_NS;
-
- /* check whether a timer is already running */
- if (timer_gettime(host_timer, &timeout)) {
- perror("gettime");
- fprintf(stderr, "Internal timer error: aborting\n");
- exit(1);
- }
- current_ns = timeout.it_value.tv_sec * 1000000000LL + timeout.it_value.tv_nsec;
- if (current_ns && current_ns <= nearest_delta_ns)
- return;
-
- timeout.it_interval.tv_sec = 0;
- timeout.it_interval.tv_nsec = 0; /* 0 for one-shot timer */
- timeout.it_value.tv_sec = nearest_delta_ns / 1000000000;
- timeout.it_value.tv_nsec = nearest_delta_ns % 1000000000;
- if (timer_settime(host_timer, 0 /* RELATIVE */, &timeout, NULL)) {
- perror("settime");
- fprintf(stderr, "Internal timer error: aborting\n");
- exit(1);
- }
-}
-
-#endif /* defined(__linux__) */
-
-#if !defined(_WIN32)
-
-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);
- return 0;
-}
-
-static void unix_rearm_timer(struct qemu_alarm_timer *t,
- int64_t nearest_delta_ns)
-{
- struct itimerval itv;
- int err;
-
- 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);
- }
-}
-
-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
-
-static MMRESULT mm_timer;
-static TIMECAPS mm_tc;
-
-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;
- }
- t->expired = true;
- t->pending = true;
- qemu_notify_event();
-}
-
-static int mm_start_timer(struct qemu_alarm_timer *t)
-{
- timeGetDevCaps(&mm_tc, sizeof(mm_tc));
- return 0;
-}
-
-static void mm_stop_timer(struct qemu_alarm_timer *t)
-{
- if (mm_timer) {
- timeKillEvent(mm_timer);
- }
-}
-
-static void mm_rearm_timer(struct qemu_alarm_timer *t, int64_t delta)
-{
- 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;
- }
-
- 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\n");
- timeEndPeriod(mm_tc.wPeriodMin);
- exit(1);
- }
-}
-
-static int win32_start_timer(struct qemu_alarm_timer *t)
-{
- 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,
- 3600000,
- WT_EXECUTEINTIMERTHREAD);
-
- if (!success) {
- fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
- GetLastError());
- return -1;
- }
-
- t->timer = hTimer;
- return 0;
-}
-
-static void win32_stop_timer(struct qemu_alarm_timer *t)
-{
- HANDLE hTimer = t->timer;
-
- if (hTimer) {
- DeleteTimerQueueTimer(NULL, hTimer, NULL);
- }
-}
-
-static void win32_rearm_timer(struct qemu_alarm_timer *t,
- int64_t nearest_delta_ns)
-{
- HANDLE hTimer = t->timer;
- int64_t nearest_delta_ms;
- BOOLEAN success;
-
- 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,
- (unsigned long) nearest_delta_ms,
- 3600000);
-
- if (!success) {
- fprintf(stderr, "Failed to rearm win32 alarm timer: %ld\n",
- GetLastError());
- exit(-1);
- }
-
-}
-
-#endif /* _WIN32 */
-
-static void quit_timers(void)
-{
- struct qemu_alarm_timer *t = alarm_timer;
- alarm_timer = NULL;
- 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];
-
- err = t->start(t);
- if (!err)
- break;
- }
-
- if (err) {
- err = -ENOENT;
- goto fail;
- }
-
- atexit(quit_timers);
-#ifdef CONFIG_POSIX
- pthread_atfork(NULL, NULL, reinit_timers);
-#endif
- alarm_timer = t;
- return 0;
-
-fail:
- return err;
-}
-
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