[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 "qemu/main-loop.h"
#include "block/aio.h"

#ifndef _WIN32

#include "qemu/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);
}

static GArray *gpollfds;

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;
    }

    gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD));
    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 int max_priority;

#ifndef _WIN32
static int glib_pollfds_idx;
static int glib_n_poll_fds;

static void glib_pollfds_fill(uint32_t *cur_timeout)
{
    GMainContext *context = g_main_context_default();
    int timeout = 0;
    int n;

    g_main_context_prepare(context, &max_priority);

    glib_pollfds_idx = gpollfds->len;
    n = glib_n_poll_fds;
    do {
        GPollFD *pfds;
        glib_n_poll_fds = n;
        g_array_set_size(gpollfds, glib_pollfds_idx + glib_n_poll_fds);
        pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);
        n = g_main_context_query(context, max_priority, &timeout, pfds,
                                 glib_n_poll_fds);
    } while (n != glib_n_poll_fds);

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

static void glib_pollfds_poll(void)
{
    GMainContext *context = g_main_context_default();
    GPollFD *pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);

    if (g_main_context_check(context, max_priority, pfds, glib_n_poll_fds)) {
        g_main_context_dispatch(context);
    }
}

static int os_host_main_loop_wait(uint32_t timeout)
{
    int ret;

    glib_pollfds_fill(&timeout);

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

    ret = g_poll((GPollFD *)gpollfds->data, gpollfds->len, timeout);

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

    glib_pollfds_poll();
    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 pollfds_fill(GArray *pollfds, fd_set *rfds, fd_set *wfds,
                        fd_set *xfds)
{
    int nfds = -1;
    int i;

    for (i = 0; i < pollfds->len; i++) {
        GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
        int fd = pfd->fd;
        int events = pfd->events;
        if (events & (G_IO_IN | G_IO_HUP | G_IO_ERR)) {
            FD_SET(fd, rfds);
            nfds = MAX(nfds, fd);
        }
        if (events & (G_IO_OUT | G_IO_ERR)) {
            FD_SET(fd, wfds);
            nfds = MAX(nfds, fd);
        }
        if (events & G_IO_PRI) {
            FD_SET(fd, xfds);
            nfds = MAX(nfds, fd);
        }
    }
    return nfds;
}

static void pollfds_poll(GArray *pollfds, int nfds, fd_set *rfds,
                         fd_set *wfds, fd_set *xfds)
{
    int i;

    for (i = 0; i < pollfds->len; i++) {
        GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
        int fd = pfd->fd;
        int revents = 0;

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

static int os_host_main_loop_wait(uint32_t timeout)
{
    GMainContext *context = g_main_context_default();
    GPollFD poll_fds[1024 * 2]; /* this is probably overkill */
    int select_ret = 0;
    int g_poll_ret, ret, i, n_poll_fds;
    PollingEntry *pe;
    WaitObjects *w = &wait_objects;
    gint poll_timeout;
    static struct timeval tv0;
    fd_set rfds, wfds, xfds;
    int nfds;

    /* 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;
    }

    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();
    g_poll_ret = g_poll(poll_fds, n_poll_fds + w->num, poll_timeout);
    qemu_mutex_lock_iothread();
    if (g_poll_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);
    }

    /* Call select after g_poll to avoid a useless iteration and therefore
     * improve socket latency.
     */

    FD_ZERO(&rfds);
    FD_ZERO(&wfds);
    FD_ZERO(&xfds);
    nfds = pollfds_fill(gpollfds, &rfds, &wfds, &xfds);
    if (nfds >= 0) {
        select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
        if (select_ret != 0) {
            timeout = 0;
        }
        if (select_ret > 0) {
            pollfds_poll(gpollfds, nfds, &rfds, &wfds, &xfds);
        }
    }

    return select_ret || g_poll_ret;
}
#endif

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

    if (nonblocking) {
        timeout = 0;
    }

    /* poll any events */
    g_array_set_size(gpollfds, 0); /* reset for new iteration */
    /* XXX: separate device handlers from system ones */
#ifdef CONFIG_SLIRP
    slirp_update_timeout(&timeout);
    slirp_pollfds_fill(gpollfds);
#endif
    qemu_iohandler_fill(gpollfds);
    ret = os_host_main_loop_wait(timeout);
    qemu_iohandler_poll(gpollfds, ret);
#ifdef CONFIG_SLIRP
    slirp_pollfds_poll(gpollfds, (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);
}

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"
1de7afc9	26	#include "qemu/timer.h"
0ec024f6	27	#include "slirp/slirp.h"
1de7afc9	28	#include "qemu/main-loop.h"
737e150e	29	#include "block/aio.h"
d3b12f5d PB	30
	31	#ifndef _WIN32
	32
1de7afc9	33	#include "qemu/compatfd.h"
0ec024f6	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
cbff4b34 SH	120	static GArray *gpollfds;
cbff4b34 SH	121
172061a0	122	int qemu_init_main_loop(void)
d3b12f5d PB	123	{
d3b12f5d PB	124	int ret;
82cbbdc6	125	GSource *src;
d3b12f5d	126
172061a0	127	init_clocks();
f9ab4654 PB	128	if (init_timer_alarm() < 0) {
	129	fprintf(stderr, "could not initialize alarm timer\n");
	130	exit(1);
	131	}
172061a0	132
d3b12f5d PB	133	ret = qemu_signal_init();
	134	if (ret) {
	135	return ret;
	136	}
	137
cbff4b34	138	gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD));
f627aab1	139	qemu_aio_context = aio_context_new();
82cbbdc6 PB	140	src = aio_get_g_source(qemu_aio_context);
	141	g_source_attach(src, NULL);
	142	g_source_unref(src);
d3b12f5d PB	143	return 0;
	144	}
	145
d3b12f5d PB	146	static int max_priority;
d3b12f5d PB	147
ea26ce76	148	#ifndef _WIN32
48ce11ff SH	149	static int glib_pollfds_idx;
	150	static int glib_n_poll_fds;
	151
	152	static void glib_pollfds_fill(uint32_t *cur_timeout)
d3b12f5d PB	153	{
d3b12f5d PB	154	GMainContext *context = g_main_context_default();
4dae83ae	155	int timeout = 0;
48ce11ff	156	int n;
d3b12f5d PB	157
	158	g_main_context_prepare(context, &max_priority);
	159
48ce11ff SH	160	glib_pollfds_idx = gpollfds->len;
	161	n = glib_n_poll_fds;
	162	do {
	163	GPollFD *pfds;
	164	glib_n_poll_fds = n;
	165	g_array_set_size(gpollfds, glib_pollfds_idx + glib_n_poll_fds);
	166	pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);
	167	n = g_main_context_query(context, max_priority, &timeout, pfds,
	168	glib_n_poll_fds);
	169	} while (n != glib_n_poll_fds);
d3b12f5d	170
4dae83ae PB	171	if (timeout >= 0 && timeout < *cur_timeout) {
4dae83ae PB	172	*cur_timeout = timeout;
d3b12f5d PB	173	}
	174	}
	175
48ce11ff	176	static void glib_pollfds_poll(void)
d3b12f5d PB	177	{
d3b12f5d PB	178	GMainContext *context = g_main_context_default();
48ce11ff	179	GPollFD *pfds = &g_array_index(gpollfds, GPollFD, glib_pollfds_idx);
d3b12f5d	180
48ce11ff	181	if (g_main_context_check(context, max_priority, pfds, glib_n_poll_fds)) {
d3b12f5d PB	182	g_main_context_dispatch(context);
	183	}
	184	}
	185
7c7db755	186	static int os_host_main_loop_wait(uint32_t timeout)
15455536	187	{
15455536 PB	188	int ret;
15455536 PB	189
48ce11ff	190	glib_pollfds_fill(&timeout);
15455536 PB	191
	192	if (timeout > 0) {
	193	qemu_mutex_unlock_iothread();
	194	}
	195
cbff4b34 SH	196	ret = g_poll((GPollFD *)gpollfds->data, gpollfds->len, timeout);
cbff4b34 SH	197
15455536 PB	198	if (timeout > 0) {
	199	qemu_mutex_lock_iothread();
	200	}
	201
48ce11ff	202	glib_pollfds_poll();
15455536 PB	203	return ret;
	204	}
	205	#else
d3b12f5d PB	206	/***********************************************************/
	207	/* Polling handling */
	208
	209	typedef struct PollingEntry {
	210	PollingFunc *func;
	211	void *opaque;
	212	struct PollingEntry *next;
	213	} PollingEntry;
	214
	215	static PollingEntry *first_polling_entry;
	216
	217	int qemu_add_polling_cb(PollingFunc func, void opaque)
	218	{
	219	PollingEntry *ppe, pe;
	220	pe = g_malloc0(sizeof(PollingEntry));
	221	pe->func = func;
	222	pe->opaque = opaque;
	223	for(ppe = &first_polling_entry; ppe != NULL; ppe = &(ppe)->next);
	224	*ppe = pe;
	225	return 0;
	226	}
	227
	228	void qemu_del_polling_cb(PollingFunc func, void opaque)
	229	{
	230	PollingEntry *ppe, pe;
	231	for(ppe = &first_polling_entry; ppe != NULL; ppe = &(ppe)->next) {
	232	pe = *ppe;
	233	if (pe->func == func && pe->opaque == opaque) {
	234	*ppe = pe->next;
	235	g_free(pe);
	236	break;
	237	}
	238	}
	239	}
	240
	241	/***********************************************************/
	242	/* Wait objects support */
	243	typedef struct WaitObjects {
	244	int num;
06ac7d49	245	int revents[MAXIMUM_WAIT_OBJECTS + 1];
d3b12f5d PB	246	HANDLE events[MAXIMUM_WAIT_OBJECTS + 1];
	247	WaitObjectFunc *func[MAXIMUM_WAIT_OBJECTS + 1];
	248	void *opaque[MAXIMUM_WAIT_OBJECTS + 1];
	249	} WaitObjects;
	250
	251	static WaitObjects wait_objects = {0};
	252
	253	int qemu_add_wait_object(HANDLE handle, WaitObjectFunc func, void opaque)
	254	{
	255	WaitObjects *w = &wait_objects;
	256	if (w->num >= MAXIMUM_WAIT_OBJECTS) {
	257	return -1;
	258	}
	259	w->events[w->num] = handle;
	260	w->func[w->num] = func;
	261	w->opaque[w->num] = opaque;
06ac7d49	262	w->revents[w->num] = 0;
d3b12f5d PB	263	w->num++;
	264	return 0;
	265	}
	266
	267	void qemu_del_wait_object(HANDLE handle, WaitObjectFunc func, void opaque)
	268	{
	269	int i, found;
	270	WaitObjects *w = &wait_objects;
	271
	272	found = 0;
	273	for (i = 0; i < w->num; i++) {
	274	if (w->events[i] == handle) {
	275	found = 1;
	276	}
	277	if (found) {
	278	w->events[i] = w->events[i + 1];
	279	w->func[i] = w->func[i + 1];
	280	w->opaque[i] = w->opaque[i + 1];
06ac7d49	281	w->revents[i] = w->revents[i + 1];
d3b12f5d PB	282	}
	283	}
	284	if (found) {
	285	w->num--;
	286	}
	287	}
	288
d3385eb4 PB	289	void qemu_fd_register(int fd)
d3385eb4 PB	290	{
4c8d0d27 PB	291	WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier),
4c8d0d27 PB	292	FD_READ \| FD_ACCEPT \| FD_CLOSE \|
d3385eb4 PB	293	FD_CONNECT \| FD_WRITE \| FD_OOB);
	294	}
	295
cbff4b34 SH	296	static int pollfds_fill(GArray pollfds, fd_set rfds, fd_set *wfds,
	297	fd_set *xfds)
	298	{
	299	int nfds = -1;
	300	int i;
	301
	302	for (i = 0; i < pollfds->len; i++) {
	303	GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
	304	int fd = pfd->fd;
	305	int events = pfd->events;
	306	if (events & (G_IO_IN \| G_IO_HUP \| G_IO_ERR)) {
	307	FD_SET(fd, rfds);
	308	nfds = MAX(nfds, fd);
	309	}
	310	if (events & (G_IO_OUT \| G_IO_ERR)) {
	311	FD_SET(fd, wfds);
	312	nfds = MAX(nfds, fd);
	313	}
	314	if (events & G_IO_PRI) {
	315	FD_SET(fd, xfds);
	316	nfds = MAX(nfds, fd);
	317	}
	318	}
	319	return nfds;
	320	}
	321
	322	static void pollfds_poll(GArray pollfds, int nfds, fd_set rfds,
	323	fd_set wfds, fd_set xfds)
	324	{
	325	int i;
	326
	327	for (i = 0; i < pollfds->len; i++) {
	328	GPollFD *pfd = &g_array_index(pollfds, GPollFD, i);
	329	int fd = pfd->fd;
	330	int revents = 0;
	331
	332	if (FD_ISSET(fd, rfds)) {
	333	revents \|= G_IO_IN \| G_IO_HUP \| G_IO_ERR;
	334	}
	335	if (FD_ISSET(fd, wfds)) {
	336	revents \|= G_IO_OUT \| G_IO_ERR;
	337	}
	338	if (FD_ISSET(fd, xfds)) {
	339	revents \|= G_IO_PRI;
	340	}
	341	pfd->revents = revents & pfd->events;
	342	}
	343	}
	344
7c7db755	345	static int os_host_main_loop_wait(uint32_t timeout)
d3b12f5d	346	{
ea26ce76	347	GMainContext *context = g_main_context_default();
48ce11ff	348	GPollFD poll_fds[1024 * 2]; /* this is probably overkill */
134a03e0	349	int select_ret = 0;
48ce11ff	350	int g_poll_ret, ret, i, n_poll_fds;
d3b12f5d	351	PollingEntry *pe;
d3385eb4	352	WaitObjects *w = &wait_objects;
42fe1c24	353	gint poll_timeout;
15455536	354	static struct timeval tv0;
9cbaacf9 SH	355	fd_set rfds, wfds, xfds;
9cbaacf9 SH	356	int nfds;
d3b12f5d PB	357
	358	/* XXX: need to suppress polling by better using win32 events */
	359	ret = 0;
	360	for (pe = first_polling_entry; pe != NULL; pe = pe->next) {
	361	ret \|= pe->func(pe->opaque);
	362	}
d3385eb4 PB	363	if (ret != 0) {
	364	return ret;
	365	}
d3b12f5d	366
ea26ce76	367	g_main_context_prepare(context, &max_priority);
42fe1c24	368	n_poll_fds = g_main_context_query(context, max_priority, &poll_timeout,
ea26ce76 PB	369	poll_fds, ARRAY_SIZE(poll_fds));
	370	g_assert(n_poll_fds <= ARRAY_SIZE(poll_fds));
	371
06ac7d49	372	for (i = 0; i < w->num; i++) {
58b9630d	373	poll_fds[n_poll_fds + i].fd = (DWORD_PTR)w->events[i];
ea26ce76	374	poll_fds[n_poll_fds + i].events = G_IO_IN;
06ac7d49 PB	375	}
06ac7d49 PB	376
3239ad04 SW	377	if (poll_timeout < 0 \|\| timeout < poll_timeout) {
	378	poll_timeout = timeout;
	379	}
	380
d3385eb4	381	qemu_mutex_unlock_iothread();
5e3bc735	382	g_poll_ret = g_poll(poll_fds, n_poll_fds + w->num, poll_timeout);
d3385eb4	383	qemu_mutex_lock_iothread();
5e3bc735	384	if (g_poll_ret > 0) {
06ac7d49	385	for (i = 0; i < w->num; i++) {
ea26ce76	386	w->revents[i] = poll_fds[n_poll_fds + i].revents;
d3385eb4	387	}
06ac7d49 PB	388	for (i = 0; i < w->num; i++) {
	389	if (w->revents[i] && w->func[i]) {
	390	w->func[i](w->opaque[i]);
d3b12f5d	391	}
d3b12f5d PB	392	}
	393	}
	394
ea26ce76 PB	395	if (g_main_context_check(context, max_priority, poll_fds, n_poll_fds)) {
	396	g_main_context_dispatch(context);
	397	}
	398
5e3bc735 FC	399	/* Call select after g_poll to avoid a useless iteration and therefore
5e3bc735 FC	400	* improve socket latency.
d3385eb4 PB	401	*/
d3385eb4 PB	402
cbff4b34 SH	403	FD_ZERO(&rfds);
	404	FD_ZERO(&wfds);
	405	FD_ZERO(&xfds);
	406	nfds = pollfds_fill(gpollfds, &rfds, &wfds, &xfds);
5e3bc735 FC	407	if (nfds >= 0) {
	408	select_ret = select(nfds + 1, &rfds, &wfds, &xfds, &tv0);
	409	if (select_ret != 0) {
	410	timeout = 0;
	411	}
cbff4b34 SH	412	if (select_ret > 0) {
	413	pollfds_poll(gpollfds, nfds, &rfds, &wfds, &xfds);
	414	}
5e3bc735 FC	415	}
	416
	417	return select_ret \|\| g_poll_ret;
d3b12f5d PB	418	}
	419	#endif
	420
	421	int main_loop_wait(int nonblocking)
	422	{
7c7db755 SS	423	int ret;
7c7db755 SS	424	uint32_t timeout = UINT32_MAX;
d3b12f5d PB	425
	426	if (nonblocking) {
	427	timeout = 0;
d3b12f5d PB	428	}
d3b12f5d PB	429
d3b12f5d	430	/* poll any events */
cbff4b34	431	g_array_set_size(gpollfds, 0); /* reset for new iteration */
d3b12f5d	432	/* XXX: separate device handlers from system ones */
d3b12f5d	433	#ifdef CONFIG_SLIRP
7c7db755	434	slirp_update_timeout(&timeout);
8917c3bd	435	slirp_pollfds_fill(gpollfds);
d3b12f5d	436	#endif
a3e4b4a8	437	qemu_iohandler_fill(gpollfds);
15455536	438	ret = os_host_main_loop_wait(timeout);
a3e4b4a8	439	qemu_iohandler_poll(gpollfds, ret);
d3b12f5d	440	#ifdef CONFIG_SLIRP
8917c3bd	441	slirp_pollfds_poll(gpollfds, (ret < 0));
d3b12f5d PB	442	#endif
	443
	444	qemu_run_all_timers();
	445
d3b12f5d PB	446	return ret;
d3b12f5d PB	447	}
f627aab1 PB	448
	449	/* Functions to operate on the main QEMU AioContext. */
	450
	451	QEMUBH qemu_bh_new(QEMUBHFunc cb, void *opaque)
	452	{
	453	return aio_bh_new(qemu_aio_context, cb, opaque);
	454	}
	455
a915f4bc PB	456	bool qemu_aio_wait(void)
a915f4bc PB	457	{
7c0628b2	458	return aio_poll(qemu_aio_context, true);
a915f4bc PB	459	}
a915f4bc PB	460
f42b2207	461	#ifdef CONFIG_POSIX
a915f4bc PB	462	void qemu_aio_set_fd_handler(int fd,
	463	IOHandler *io_read,
	464	IOHandler *io_write,
	465	AioFlushHandler *io_flush,
	466	void *opaque)
	467	{
	468	aio_set_fd_handler(qemu_aio_context, fd, io_read, io_write, io_flush,
	469	opaque);
a915f4bc	470	}
82cbbdc6	471	#endif
a915f4bc	472
a915f4bc PB	473	void qemu_aio_set_event_notifier(EventNotifier *notifier,
	474	EventNotifierHandler *io_read,
	475	AioFlushEventNotifierHandler *io_flush)
	476	{
82cbbdc6	477	aio_set_event_notifier(qemu_aio_context, notifier, io_read, io_flush);
a915f4bc	478	}