[qemu.git] / main-loop.c

/*
 * QEMU System Emulator
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

#include "qemu-common.h"
#include "qemu-timer.h"
#include "slirp/slirp.h"
#include "main-loop.h"
#include "qemu-aio.h"

#ifndef _WIN32

#include "compatfd.h"

/* If we have signalfd, we mask out the signals we want to handle and then
 * use signalfd to listen for them.  We rely on whatever the current signal
 * handler is to dispatch the signals when we receive them.
 */
static void sigfd_handler(void *opaque)
{
    int fd = (intptr_t)opaque;
    struct qemu_signalfd_siginfo info;
    struct sigaction action;
    ssize_t len;

    while (1) {
        do {
            len = read(fd, &info, sizeof(info));
        } while (len == -1 && errno == EINTR);

        if (len == -1 && errno == EAGAIN) {
            break;
        }

        if (len != sizeof(info)) {
            printf("read from sigfd returned %zd: %m\n", len);
            return;
        }

        sigaction(info.ssi_signo, NULL, &action);
        if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
            action.sa_sigaction(info.ssi_signo,
                                (siginfo_t *)&info, NULL);
        } else if (action.sa_handler) {
            action.sa_handler(info.ssi_signo);
        }
    }
}

static int qemu_signal_init(void)
{
    int sigfd;
    sigset_t set;

    /*
     * SIG_IPI must be blocked in the main thread and must not be caught
     * by sigwait() in the signal thread. Otherwise, the cpu thread will
     * not catch it reliably.
     */
    sigemptyset(&set);
    sigaddset(&set, SIG_IPI);
    sigaddset(&set, SIGIO);
    sigaddset(&set, SIGALRM);
    sigaddset(&set, SIGBUS);
    pthread_sigmask(SIG_BLOCK, &set, NULL);

    sigdelset(&set, SIG_IPI);
    sigfd = qemu_signalfd(&set);
    if (sigfd == -1) {
        fprintf(stderr, "failed to create signalfd\n");
        return -errno;
    }

    fcntl_setfl(sigfd, O_NONBLOCK);

    qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL,
                         (void *)(intptr_t)sigfd);

    return 0;
}

#else /* _WIN32 */

static int qemu_signal_init(void)
{
    return 0;
}
#endif

static AioContext *qemu_aio_context;

void qemu_notify_event(void)
{
    if (!qemu_aio_context) {
        return;
    }
    aio_notify(qemu_aio_context);
}

int qemu_init_main_loop(void)
{
    int ret;
    GSource *src;

    init_clocks();
    if (init_timer_alarm() < 0) {
        fprintf(stderr, "could not initialize alarm timer\n");
        exit(1);
    }

    ret = qemu_signal_init();
    if (ret) {
        return ret;
    }

    qemu_aio_context = aio_context_new();
    src = aio_get_g_source(qemu_aio_context);
    g_source_attach(src, NULL);
    g_source_unref(src);
    return 0;
}

static fd_set rfds, wfds, xfds;
static int nfds;
static GPollFD poll_fds[1024 * 2]; /* this is probably overkill */
static int n_poll_fds;
static int max_priority;

#ifndef _WIN32
static void glib_select_fill(int *max_fd, fd_set *rfds, fd_set *wfds,
                             fd_set *xfds, uint32_t *cur_timeout)
{
    GMainContext *context = g_main_context_default();
    int i;
    int timeout = 0;

    g_main_context_prepare(context, &max_priority);

    n_poll_fds = g_main_context_query(context, max_priority, &timeout,
                                      poll_fds, ARRAY_SIZE(poll_fds));
    g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));

    for (i = 0; i < n_poll_fds; i++) {
        GPollFD *p = &poll_fds[i];

        if ((p->events & G_IO_IN)) {
            FD_SET(p->fd, rfds);
            *max_fd = MAX(*max_fd, p->fd);
        }
        if ((p->events & G_IO_OUT)) {
            FD_SET(p->fd, wfds);
            *max_fd = MAX(*max_fd, p->fd);
        }
        if ((p->events & G_IO_ERR)) {
            FD_SET(p->fd, xfds);
            *max_fd = MAX(*max_fd, p->fd);
        }
    }

    if (timeout >= 0 && timeout < *cur_timeout) {
        *cur_timeout = timeout;
    }
}

static void glib_select_poll(fd_set *rfds, fd_set *wfds, fd_set *xfds,
                             bool err)
{
    GMainContext *context = g_main_context_default();

    if (!err) {
        int i;

        for (i = 0; i < n_poll_fds; i++) {
            GPollFD *p = &poll_fds[i];

            if ((p->events & G_IO_IN) && FD_ISSET(p->fd, rfds)) {
                p->revents |= G_IO_IN;
            }
            if ((p->events & G_IO_OUT) && FD_ISSET(p->fd, wfds)) {
                p->revents |= G_IO_OUT;
            }
            if ((p->events & G_IO_ERR) && FD_ISSET(p->fd, xfds)) {
                p->revents |= G_IO_ERR;
            }
        }
    }

    if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) {
        g_main_context_dispatch(context);
    }
}

static int os_host_main_loop_wait(uint32_t timeout)
{
    struct timeval tv, *tvarg = NULL;
    int ret;

    glib_select_fill(&nfds, &rfds, &wfds, &xfds, &timeout);

    if (timeout < UINT32_MAX) {
        tvarg = &tv;
        tv.tv_sec = timeout / 1000;
        tv.tv_usec = (timeout % 1000) * 1000;
    }

    if (timeout > 0) {
        qemu_mutex_unlock_iothread();
    }

    ret = select(nfds + 1, &rfds, &wfds, &xfds, tvarg);

    if (timeout > 0) {
        qemu_mutex_lock_iothread();
    }

    glib_select_poll(&rfds, &wfds, &xfds, (ret < 0));
    return ret;
}
#else
/***********************************************************/
/* Polling handling */

typedef struct PollingEntry {
    PollingFunc *func;
    void *opaque;
    struct PollingEntry *next;
} PollingEntry;

static PollingEntry *first_polling_entry;

int qemu_add_polling_cb(PollingFunc *func, void *opaque)
{
    PollingEntry **ppe, *pe;
    pe = g_malloc0(sizeof(PollingEntry));
    pe->func = func;
    pe->opaque = opaque;
    for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next);
    *ppe = pe;
    return 0;
}

void qemu_del_polling_cb(PollingFunc *func, void *opaque)
{
    PollingEntry **ppe, *pe;
    for(ppe = &first_polling_entry; *ppe != NULL; ppe = &(*ppe)->next) {
        pe = *ppe;
        if (pe->func == func && pe->opaque == opaque) {
            *ppe = pe->next;
            g_free(pe);
            break;
        }
    }
}

/***********************************************************/
/* Wait objects support */
typedef struct WaitObjects {
    int num;
    int revents[MAXIMUM_WAIT_OBJECTS + 1];
    HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
    WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];
    void *opaque[MAXIMUM_WAIT_OBJECTS + 1];
} WaitObjects;

static WaitObjects wait_objects = {0};

int qemu_add_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
{
    WaitObjects *w = &wait_objects;
    if (w->num >= MAXIMUM_WAIT_OBJECTS) {
        return -1;
    }
    w->events[w->num] = handle;
    w->func[w->num] = func;
    w->opaque[w->num] = opaque;
    w->revents[w->num] = 0;
    w->num++;
    return 0;
}

void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
{
    int i, found;
    WaitObjects *w = &wait_objects;

    found = 0;
    for (i = 0; i < w->num; i++) {
        if (w->events[i] == handle) {
            found = 1;
        }
        if (found) {
            w->events[i] = w->events[i + 1];
            w->func[i] = w->func[i + 1];
            w->opaque[i] = w->opaque[i + 1];
            w->revents[i] = w->revents[i + 1];
        }
    }
    if (found) {
        w->num--;
    }
}

void qemu_fd_register(int fd)
{
    WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier),
                   FD_READ | FD_ACCEPT | FD_CLOSE |
                   FD_CONNECT | FD_WRITE | FD_OOB);
}

static int os_host_main_loop_wait(uint32_t timeout)
{
    GMainContext *context = g_main_context_default();
    int ret, i;
    PollingEntry *pe;
    WaitObjects *w = &wait_objects;
    gint poll_timeout;
    static struct timeval tv0;

    /* XXX: need to suppress polling by better using win32 events */
    ret = 0;
    for (pe = first_polling_entry; pe != NULL; pe = pe->next) {
        ret |= pe->func(pe->opaque);
    }
    if (ret != 0) {
        return ret;
    }

    if (nfds >= 0) {
        ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
        if (ret != 0) {
            timeout = 0;
        }
    }

    g_main_context_prepare(context, &max_priority);
    n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
                                      poll_fds, ARRAY_SIZE(poll_fds));
    g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));

    for (i = 0; i < w->num; i++) {
        poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i];
        poll_fds[n_poll_fds + i].events = G_IO_IN;
    }

    if (poll_timeout < 0 || timeout < poll_timeout) {
        poll_timeout = timeout;
    }

    qemu_mutex_unlock_iothread();
    ret = g_poll(poll_fds, n_poll_fds + w->num, poll_timeout);
    qemu_mutex_lock_iothread();
    if (ret > 0) {
        for (i = 0; i < w->num; i++) {
            w->revents[i] = poll_fds[n_poll_fds + i].revents;
        }
        for (i = 0; i < w->num; i++) {
            if (w->revents[i] && w->func[i]) {
                w->func[i](w->opaque[i]);
            }
        }
    }

    if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) {
        g_main_context_dispatch(context);
    }

    /* If an edge-triggered socket event occurred, select will return a
     * positive result on the next iteration.  We do not need to do anything
     * here.
     */

    return ret;
}
#endif

int main_loop_wait(int nonblocking)
{
    int ret;
    uint32_t timeout = UINT32_MAX;

    if (nonblocking) {
        timeout = 0;
    }

    /* poll any events */
    /* XXX: separate device handlers from system ones */
    nfds = -1;
    FD_ZERO(&rfds);
    FD_ZERO(&wfds);
    FD_ZERO(&xfds);

#ifdef CONFIG_SLIRP
    slirp_update_timeout(&timeout);
    slirp_select_fill(&nfds, &rfds, &wfds, &xfds);
#endif
    qemu_iohandler_fill(&nfds, &rfds, &wfds, &xfds);
    ret = os_host_main_loop_wait(timeout);
    qemu_iohandler_poll(&rfds, &wfds, &xfds, ret);
#ifdef CONFIG_SLIRP
    slirp_select_poll(&rfds, &wfds, &xfds, (ret < 0));
#endif

    qemu_run_all_timers();

    return ret;
}

/* Functions to operate on the main QEMU AioContext.  */

QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque)
{
    return aio_bh_new(qemu_aio_context, cb, opaque);
}

void qemu_aio_flush(void)
{
    aio_flush(qemu_aio_context);
}

bool qemu_aio_wait(void)
{
    return aio_poll(qemu_aio_context, true);
}

#ifdef CONFIG_POSIX
void qemu_aio_set_fd_handler(int fd,
                             IOHandler *io_read,
                             IOHandler *io_write,
                             AioFlushHandler *io_flush,
                             void *opaque)
{
    aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, io_flush,
                       opaque);
}
#endif

void qemu_aio_set_event_notifier(EventNotifier *notifier,
                                 EventNotifierHandler *io_read,
                                 AioFlushEventNotifierHandler *io_flush)
{
    aio_set_event_notifier(qemu_aio_context, notifier, io_read, io_flush);
}
Commit	Line	Data
d3b12f5d PB	1	/*
	2	* QEMU System Emulator
	3	*
	4	* Copyright (c) 2003-2008 Fabrice Bellard
	5	*
	6	* Permission is hereby granted, free of charge, to any person obtaining a copy
	7	* of this software and associated documentation files (the "Software"), to deal
	8	* in the Software without restriction, including without limitation the rights
	9	* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
	10	* copies of the Software, and to permit persons to whom the Software is
	11	* furnished to do so, subject to the following conditions:
	12	*
	13	* The above copyright notice and this permission notice shall be included in
	14	* all copies or substantial portions of the Software.
	15	*
	16	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	17	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	18	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	19	* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
	20	* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
	21	* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
	22	* THE SOFTWARE.
	23	*/
d3b12f5d	24
0ec024f6	25	#include "qemu-common.h"
d3b12f5d	26	#include "qemu-timer.h"
0ec024f6 SW	27	#include "slirp/slirp.h"
0ec024f6 SW	28	#include "main-loop.h"
f627aab1	29	#include "qemu-aio.h"
d3b12f5d PB	30
	31	#ifndef _WIN32
	32
0ec024f6 SW	33	#include "compatfd.h"
0ec024f6 SW	34
d3b12f5d PB	35	/* If we have signalfd, we mask out the signals we want to handle and then
	36	* use signalfd to listen for them. We rely on whatever the current signal
	37	* handler is to dispatch the signals when we receive them.
	38	*/
	39	static void sigfd_handler(void *opaque)
	40	{
	41	int fd = (intptr_t)opaque;
	42	struct qemu_signalfd_siginfo info;
	43	struct sigaction action;
	44	ssize_t len;
	45
	46	while (1) {
	47	do {
	48	len = read(fd, &info, sizeof(info));
	49	} while (len == -1 && errno == EINTR);
	50
	51	if (len == -1 && errno == EAGAIN) {
	52	break;
	53	}
	54
	55	if (len != sizeof(info)) {
	56	printf("read from sigfd returned %zd: %m\n", len);
	57	return;
	58	}
	59
	60	sigaction(info.ssi_signo, NULL, &action);
	61	if ((action.sa_flags & SA_SIGINFO) && action.sa_sigaction) {
	62	action.sa_sigaction(info.ssi_signo,
	63	(siginfo_t *)&info, NULL);
	64	} else if (action.sa_handler) {
	65	action.sa_handler(info.ssi_signo);
	66	}
	67	}
	68	}
	69
	70	static int qemu_signal_init(void)
	71	{
	72	int sigfd;
	73	sigset_t set;
	74
	75	/*
	76	* SIG_IPI must be blocked in the main thread and must not be caught
	77	* by sigwait() in the signal thread. Otherwise, the cpu thread will
	78	* not catch it reliably.
	79	*/
	80	sigemptyset(&set);
	81	sigaddset(&set, SIG_IPI);
d3b12f5d PB	82	sigaddset(&set, SIGIO);
	83	sigaddset(&set, SIGALRM);
	84	sigaddset(&set, SIGBUS);
	85	pthread_sigmask(SIG_BLOCK, &set, NULL);
	86
4aa7534d	87	sigdelset(&set, SIG_IPI);
d3b12f5d PB	88	sigfd = qemu_signalfd(&set);
	89	if (sigfd == -1) {
	90	fprintf(stderr, "failed to create signalfd\n");
	91	return -errno;
	92	}
	93
	94	fcntl_setfl(sigfd, O_NONBLOCK);
	95
	96	qemu_set_fd_handler2(sigfd, NULL, sigfd_handler, NULL,
	97	(void *)(intptr_t)sigfd);
	98
	99	return 0;
	100	}
	101
	102	#else /* _WIN32 */
	103
4c8d0d27	104	static int qemu_signal_init(void)
d3b12f5d	105	{
d3b12f5d PB	106	return 0;
d3b12f5d PB	107	}
4c8d0d27 PB	108	#endif
	109
	110	static AioContext *qemu_aio_context;
d3b12f5d PB	111
	112	void qemu_notify_event(void)
	113	{
4c8d0d27	114	if (!qemu_aio_context) {
ee77dfb2 MR	115	return;
ee77dfb2 MR	116	}
4c8d0d27	117	aio_notify(qemu_aio_context);
d3b12f5d PB	118	}
d3b12f5d PB	119
172061a0	120	int qemu_init_main_loop(void)
d3b12f5d PB	121	{
d3b12f5d PB	122	int ret;
82cbbdc6	123	GSource *src;
d3b12f5d	124
172061a0	125	init_clocks();
f9ab4654 PB	126	if (init_timer_alarm() < 0) {
	127	fprintf(stderr, "could not initialize alarm timer\n");
	128	exit(1);
	129	}
172061a0	130
d3b12f5d PB	131	ret = qemu_signal_init();
	132	if (ret) {
	133	return ret;
	134	}
	135
f627aab1	136	qemu_aio_context = aio_context_new();
82cbbdc6 PB	137	src = aio_get_g_source(qemu_aio_context);
	138	g_source_attach(src, NULL);
	139	g_source_unref(src);
d3b12f5d PB	140	return 0;
	141	}
	142
15455536 PB	143	static fd_set rfds, wfds, xfds;
15455536 PB	144	static int nfds;
06ac7d49	145	static GPollFD poll_fds[1024 * 2]; /* this is probably overkill */
d3b12f5d PB	146	static int n_poll_fds;
	147	static int max_priority;
	148
ea26ce76	149	#ifndef _WIN32
d3b12f5d	150	static void glib_select_fill(int max_fd, fd_set rfds, fd_set *wfds,
7c7db755	151	fd_set xfds, uint32_t cur_timeout)
d3b12f5d PB	152	{
	153	GMainContext *context = g_main_context_default();
	154	int i;
4dae83ae	155	int timeout = 0;
d3b12f5d PB	156
	157	g_main_context_prepare(context, &max_priority);
	158
	159	n_poll_fds = g_main_context_query(context, max_priority, &timeout,
	160	poll_fds, ARRAY_SIZE(poll_fds));
	161	g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));
	162
	163	for (i = 0; i < n_poll_fds; i++) {
	164	GPollFD *p = &poll_fds[i];
	165
	166	if ((p->events & G_IO_IN)) {
	167	FD_SET(p->fd, rfds);
	168	max_fd = MAX(max_fd, p->fd);
	169	}
	170	if ((p->events & G_IO_OUT)) {
	171	FD_SET(p->fd, wfds);
	172	max_fd = MAX(max_fd, p->fd);
	173	}
	174	if ((p->events & G_IO_ERR)) {
	175	FD_SET(p->fd, xfds);
	176	max_fd = MAX(max_fd, p->fd);
	177	}
	178	}
	179
4dae83ae PB	180	if (timeout >= 0 && timeout < *cur_timeout) {
4dae83ae PB	181	*cur_timeout = timeout;
d3b12f5d PB	182	}
	183	}
	184
	185	static void glib_select_poll(fd_set rfds, fd_set wfds, fd_set *xfds,
	186	bool err)
	187	{
	188	GMainContext *context = g_main_context_default();
	189
	190	if (!err) {
	191	int i;
	192
	193	for (i = 0; i < n_poll_fds; i++) {
	194	GPollFD *p = &poll_fds[i];
	195
	196	if ((p->events & G_IO_IN) && FD_ISSET(p->fd, rfds)) {
	197	p->revents \|= G_IO_IN;
	198	}
	199	if ((p->events & G_IO_OUT) && FD_ISSET(p->fd, wfds)) {
	200	p->revents \|= G_IO_OUT;
	201	}
	202	if ((p->events & G_IO_ERR) && FD_ISSET(p->fd, xfds)) {
	203	p->revents \|= G_IO_ERR;
	204	}
	205	}
	206	}
	207
	208	if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) {
	209	g_main_context_dispatch(context);
	210	}
	211	}
	212
7c7db755	213	static int os_host_main_loop_wait(uint32_t timeout)
15455536	214	{
7c7db755	215	struct timeval tv, *tvarg = NULL;
15455536 PB	216	int ret;
	217
	218	glib_select_fill(&nfds, &rfds, &wfds, &xfds, &timeout);
	219
7c7db755 SS	220	if (timeout < UINT32_MAX) {
	221	tvarg = &tv;
	222	tv.tv_sec = timeout / 1000;
	223	tv.tv_usec = (timeout % 1000) * 1000;
	224	}
	225
15455536 PB	226	if (timeout > 0) {
	227	qemu_mutex_unlock_iothread();
	228	}
	229
7c7db755	230	ret = select(nfds + 1, &rfds, &wfds, &xfds, tvarg);
15455536 PB	231
	232	if (timeout > 0) {
	233	qemu_mutex_lock_iothread();
	234	}
	235
	236	glib_select_poll(&rfds, &wfds, &xfds, (ret < 0));
	237	return ret;
	238	}
	239	#else
d3b12f5d PB	240	/***********************************************************/
	241	/* Polling handling */
	242
	243	typedef struct PollingEntry {
	244	PollingFunc *func;
	245	void *opaque;
	246	struct PollingEntry *next;
	247	} PollingEntry;
	248
	249	static PollingEntry *first_polling_entry;
	250
	251	int qemu_add_polling_cb(PollingFunc func, void opaque)
	252	{
	253	PollingEntry *ppe, pe;
	254	pe = g_malloc0(sizeof(PollingEntry));
	255	pe->func = func;
	256	pe->opaque = opaque;
	257	for(ppe = &first_polling_entry; ppe != NULL; ppe = &(ppe)->next);
	258	*ppe = pe;
	259	return 0;
	260	}
	261
	262	void qemu_del_polling_cb(PollingFunc func, void opaque)
	263	{
	264	PollingEntry *ppe, pe;
	265	for(ppe = &first_polling_entry; ppe != NULL; ppe = &(ppe)->next) {
	266	pe = *ppe;
	267	if (pe->func == func && pe->opaque == opaque) {
	268	*ppe = pe->next;
	269	g_free(pe);
	270	break;
	271	}
	272	}
	273	}
	274
	275	/***********************************************************/
	276	/* Wait objects support */
	277	typedef struct WaitObjects {
	278	int num;
06ac7d49	279	int revents[MAXIMUM_WAIT_OBJECTS + 1];
d3b12f5d PB	280	HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
	281	WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];
	282	void *opaque[MAXIMUM_WAIT_OBJECTS + 1];
	283	} WaitObjects;
	284
	285	static WaitObjects wait_objects = {0};
	286
	287	int qemu_add_wait_object(HANDLE handle, WaitObjectFunc func, void opaque)
	288	{
	289	WaitObjects *w = &wait_objects;
	290	if (w->num >= MAXIMUM_WAIT_OBJECTS) {
	291	return -1;
	292	}
	293	w->events[w->num] = handle;
	294	w->func[w->num] = func;
	295	w->opaque[w->num] = opaque;
06ac7d49	296	w->revents[w->num] = 0;
d3b12f5d PB	297	w->num++;
	298	return 0;
	299	}
	300
	301	void qemu_del_wait_object(HANDLE handle, WaitObjectFunc func, void opaque)
	302	{
	303	int i, found;
	304	WaitObjects *w = &wait_objects;
	305
	306	found = 0;
	307	for (i = 0; i < w->num; i++) {
	308	if (w->events[i] == handle) {
	309	found = 1;
	310	}
	311	if (found) {
	312	w->events[i] = w->events[i + 1];
	313	w->func[i] = w->func[i + 1];
	314	w->opaque[i] = w->opaque[i + 1];
06ac7d49	315	w->revents[i] = w->revents[i + 1];
d3b12f5d PB	316	}
	317	}
	318	if (found) {
	319	w->num--;
	320	}
	321	}
	322
d3385eb4 PB	323	void qemu_fd_register(int fd)
d3385eb4 PB	324	{
4c8d0d27 PB	325	WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier),
4c8d0d27 PB	326	FD_READ \| FD_ACCEPT \| FD_CLOSE \|
d3385eb4 PB	327	FD_CONNECT \| FD_WRITE \| FD_OOB);
	328	}
	329
7c7db755	330	static int os_host_main_loop_wait(uint32_t timeout)
d3b12f5d	331	{
ea26ce76	332	GMainContext *context = g_main_context_default();
06ac7d49	333	int ret, i;
d3b12f5d	334	PollingEntry *pe;
d3385eb4	335	WaitObjects *w = &wait_objects;
42fe1c24	336	gint poll_timeout;
15455536	337	static struct timeval tv0;
d3b12f5d PB	338
	339	/* XXX: need to suppress polling by better using win32 events */
	340	ret = 0;
	341	for (pe = first_polling_entry; pe != NULL; pe = pe->next) {
	342	ret \|= pe->func(pe->opaque);
	343	}
d3385eb4 PB	344	if (ret != 0) {
	345	return ret;
	346	}
d3b12f5d	347
d3385eb4 PB	348	if (nfds >= 0) {
	349	ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
	350	if (ret != 0) {
3239ad04	351	timeout = 0;
d3385eb4 PB	352	}
d3385eb4 PB	353	}
d3b12f5d	354
ea26ce76	355	g_main_context_prepare(context, &max_priority);
42fe1c24	356	n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
ea26ce76 PB	357	poll_fds, ARRAY_SIZE(poll_fds));
	358	g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));
	359
06ac7d49	360	for (i = 0; i < w->num; i++) {
58b9630d	361	poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i];
ea26ce76	362	poll_fds[n_poll_fds + i].events = G_IO_IN;
06ac7d49 PB	363	}
06ac7d49 PB	364
3239ad04 SW	365	if (poll_timeout < 0 \|\| timeout < poll_timeout) {
	366	poll_timeout = timeout;
	367	}
	368
d3385eb4	369	qemu_mutex_unlock_iothread();
42fe1c24	370	ret = g_poll(poll_fds, n_poll_fds + w->num, poll_timeout);
d3385eb4	371	qemu_mutex_lock_iothread();
06ac7d49 PB	372	if (ret > 0) {
06ac7d49 PB	373	for (i = 0; i < w->num; i++) {
ea26ce76	374	w->revents[i] = poll_fds[n_poll_fds + i].revents;
d3385eb4	375	}
06ac7d49 PB	376	for (i = 0; i < w->num; i++) {
	377	if (w->revents[i] && w->func[i]) {
	378	w->func[i](w->opaque[i]);
d3b12f5d	379	}
d3b12f5d PB	380	}
	381	}
	382
ea26ce76 PB	383	if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) {
	384	g_main_context_dispatch(context);
	385	}
	386
d3385eb4 PB	387	/* If an edge-triggered socket event occurred, select will return a
	388	* positive result on the next iteration. We do not need to do anything
	389	* here.
	390	*/
	391
15455536	392	return ret;
d3b12f5d PB	393	}
	394	#endif
	395
	396	int main_loop_wait(int nonblocking)
	397	{
7c7db755 SS	398	int ret;
7c7db755 SS	399	uint32_t timeout = UINT32_MAX;
d3b12f5d PB	400
	401	if (nonblocking) {
	402	timeout = 0;
d3b12f5d PB	403	}
d3b12f5d PB	404
d3b12f5d PB	405	/* poll any events */
	406	/* XXX: separate device handlers from system ones */
	407	nfds = -1;
	408	FD_ZERO(&rfds);
	409	FD_ZERO(&wfds);
	410	FD_ZERO(&xfds);
	411
	412	#ifdef CONFIG_SLIRP
7c7db755	413	slirp_update_timeout(&timeout);
d3b12f5d PB	414	slirp_select_fill(&nfds, &rfds, &wfds, &xfds);
	415	#endif
	416	qemu_iohandler_fill(&nfds, &rfds, &wfds, &xfds);
15455536	417	ret = os_host_main_loop_wait(timeout);
d3b12f5d PB	418	qemu_iohandler_poll(&rfds, &wfds, &xfds, ret);
	419	#ifdef CONFIG_SLIRP
	420	slirp_select_poll(&rfds, &wfds, &xfds, (ret < 0));
	421	#endif
	422
	423	qemu_run_all_timers();
	424
d3b12f5d PB	425	return ret;
d3b12f5d PB	426	}
f627aab1 PB	427
	428	/* Functions to operate on the main QEMU AioContext. */
	429
	430	QEMUBH qemu_bh_new(QEMUBHFunc cb, void *opaque)
	431	{
	432	return aio_bh_new(qemu_aio_context, cb, opaque);
	433	}
	434
a915f4bc PB	435	void qemu_aio_flush(void)
	436	{
	437	aio_flush(qemu_aio_context);
	438	}
	439
	440	bool qemu_aio_wait(void)
	441	{
7c0628b2	442	return aio_poll(qemu_aio_context, true);
a915f4bc PB	443	}
a915f4bc PB	444
f42b2207	445	#ifdef CONFIG_POSIX
a915f4bc PB	446	void qemu_aio_set_fd_handler(int fd,
	447	IOHandler *io_read,
	448	IOHandler *io_write,
	449	AioFlushHandler *io_flush,
	450	void *opaque)
	451	{
	452	aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, io_flush,
	453	opaque);
a915f4bc	454	}
82cbbdc6	455	#endif
a915f4bc	456
a915f4bc PB	457	void qemu_aio_set_event_notifier(EventNotifier *notifier,
	458	EventNotifierHandler *io_read,
	459	AioFlushEventNotifierHandler *io_flush)
	460	{
82cbbdc6	461	aio_set_event_notifier(qemu_aio_context, notifier, io_read, io_flush);
a915f4bc	462	}