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-rw-r--r--qemu/main-loop.c524
1 files changed, 0 insertions, 524 deletions
diff --git a/qemu/main-loop.c b/qemu/main-loop.c
deleted file mode 100644
index 89a699419..000000000
--- a/qemu/main-loop.c
+++ /dev/null
@@ -1,524 +0,0 @@
-/*
- * 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/osdep.h"
-#include "qapi/error.h"
-#include "qemu/cutils.h"
-#include "qemu/timer.h"
-#include "qemu/sockets.h" // struct in_addr needed for libslirp.h
-#include "sysemu/qtest.h"
-#include "slirp/libslirp.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);
- /* SIGINT cannot be handled via signalfd, so that ^C can be used
- * to interrupt QEMU when it is being run under gdb. SIGHUP and
- * SIGTERM are also handled asynchronously, even though it is not
- * strictly necessary, because they use the same handler as SIGINT.
- */
- 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_handler(sigfd, 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;
-static QEMUBH *qemu_notify_bh;
-
-static void notify_event_cb(void *opaque)
-{
- /* No need to do anything; this bottom half is only used to
- * kick the kernel out of ppoll/poll/WaitForMultipleObjects.
- */
-}
-
-AioContext *qemu_get_aio_context(void)
-{
- return qemu_aio_context;
-}
-
-void qemu_notify_event(void)
-{
- if (!qemu_aio_context) {
- return;
- }
- qemu_bh_schedule(qemu_notify_bh);
-}
-
-static GArray *gpollfds;
-
-int qemu_init_main_loop(Error **errp)
-{
- int ret;
- GSource *src;
- Error *local_error = NULL;
-
- init_clocks();
-
- ret = qemu_signal_init();
- if (ret) {
- return ret;
- }
-
- qemu_aio_context = aio_context_new(&local_error);
- qemu_notify_bh = qemu_bh_new(notify_event_cb, NULL);
- if (!qemu_aio_context) {
- error_propagate(errp, local_error);
- return -EMFILE;
- }
- gpollfds = g_array_new(FALSE, FALSE, sizeof(GPollFD));
- src = aio_get_g_source(qemu_aio_context);
- g_source_attach(src, NULL);
- g_source_unref(src);
- src = iohandler_get_g_source();
- 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(int64_t *cur_timeout)
-{
- GMainContext *context = g_main_context_default();
- int timeout = 0;
- int64_t timeout_ns;
- 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_ns = -1;
- } else {
- timeout_ns = (int64_t)timeout * (int64_t)SCALE_MS;
- }
-
- *cur_timeout = qemu_soonest_timeout(timeout_ns, *cur_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);
- }
-}
-
-#define MAX_MAIN_LOOP_SPIN (1000)
-
-static int os_host_main_loop_wait(int64_t timeout)
-{
- int ret;
- static int spin_counter;
-
- glib_pollfds_fill(&timeout);
-
- /* If the I/O thread is very busy or we are incorrectly busy waiting in
- * the I/O thread, this can lead to starvation of the BQL such that the
- * VCPU threads never run. To make sure we can detect the later case,
- * print a message to the screen. If we run into this condition, create
- * a fake timeout in order to give the VCPU threads a chance to run.
- */
- if (!timeout && (spin_counter > MAX_MAIN_LOOP_SPIN)) {
- static bool notified;
-
- if (!notified && !qtest_driver()) {
- fprintf(stderr,
- "main-loop: WARNING: I/O thread spun for %d iterations\n",
- MAX_MAIN_LOOP_SPIN);
- notified = true;
- }
-
- timeout = SCALE_MS;
- }
-
- if (timeout) {
- spin_counter = 0;
- qemu_mutex_unlock_iothread();
- } else {
- spin_counter++;
- }
-
- ret = qemu_poll_ns((GPollFD *)gpollfds->data, gpollfds->len, timeout);
-
- if (timeout) {
- 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) {
- FD_SET(fd, rfds);
- nfds = MAX(nfds, fd);
- }
- if (events & G_IO_OUT) {
- 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;
- }
- if (FD_ISSET(fd, wfds)) {
- revents |= G_IO_OUT;
- }
- if (FD_ISSET(fd, xfds)) {
- revents |= G_IO_PRI;
- }
- pfd->revents = revents & pfd->events;
- }
-}
-
-static int os_host_main_loop_wait(int64_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;
- int64_t poll_timeout_ns;
- 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;
- }
-
- 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);
- }
- }
-
- 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) {
- poll_timeout_ns = -1;
- } else {
- poll_timeout_ns = (int64_t)poll_timeout * (int64_t)SCALE_MS;
- }
-
- poll_timeout_ns = qemu_soonest_timeout(poll_timeout_ns, timeout);
-
- qemu_mutex_unlock_iothread();
- g_poll_ret = qemu_poll_ns(poll_fds, n_poll_fds + w->num, poll_timeout_ns);
-
- 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);
- }
-
- return select_ret || g_poll_ret;
-}
-#endif
-
-int main_loop_wait(int nonblocking)
-{
- int ret;
- uint32_t timeout = UINT32_MAX;
- int64_t timeout_ns;
-
- 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_pollfds_fill(gpollfds, &timeout);
-#endif
-
- if (timeout == UINT32_MAX) {
- timeout_ns = -1;
- } else {
- timeout_ns = (uint64_t)timeout * (int64_t)(SCALE_MS);
- }
-
- timeout_ns = qemu_soonest_timeout(timeout_ns,
- timerlistgroup_deadline_ns(
- &main_loop_tlg));
-
- ret = os_host_main_loop_wait(timeout_ns);
-#ifdef CONFIG_SLIRP
- slirp_pollfds_poll(gpollfds, (ret < 0));
-#endif
-
- /* CPU thread can infinitely wait for event after
- missing the warp */
- qemu_start_warp_timer();
- qemu_clock_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);
-}