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qemu
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main-loop: use aio_notify for qemu_notify_event 

Reviewed-by: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2010-05-24 17:27:14 +02:00
parent 82cbbdc6a0
commit 4c8d0d2767
1 changed files with 10 additions and 100 deletions
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110
main-loop.c
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@ -32,70 +32,6 @@
#include "compatfd.h"
static int io_thread_fd = -1;
void qemu_notify_event(void)
{
/* Write 8 bytes to be compatible with eventfd. */
static const uint64_t val = 1;
ssize_t ret;
if (io_thread_fd == -1) {
return;
}
do {
ret = write(io_thread_fd, &val, sizeof(val));
} while (ret < 0 && errno == EINTR);
/* EAGAIN is fine, a read must be pending. */
if (ret < 0 && errno != EAGAIN) {
fprintf(stderr, "qemu_notify_event: write() failed: %s\n",
strerror(errno));
exit(1);
}
}
static void qemu_event_read(void *opaque)
{
int fd = (intptr_t)opaque;
ssize_t len;
char buffer[512];
/* Drain the notify pipe. For eventfd, only 8 bytes will be read. */
do {
len = read(fd, buffer, sizeof(buffer));
} while ((len == -1 && errno == EINTR) || len == sizeof(buffer));
}
static int qemu_event_init(void)
{
int err;
int fds[2];
err = qemu_eventfd(fds);
if (err == -1) {
return -errno;
}
err = fcntl_setfl(fds[0], O_NONBLOCK);
if (err < 0) {
goto fail;
}
err = fcntl_setfl(fds[1], O_NONBLOCK);
if (err < 0) {
goto fail;
}
qemu_set_fd_handler2(fds[0], NULL, qemu_event_read, NULL,
(void *)(intptr_t)fds[0]);
io_thread_fd = fds[1];
return 0;
fail:
close(fds[0]);
close(fds[1]);
return err;
}
/* 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.
@ -165,35 +101,6 @@ static int qemu_signal_init(void)
#else /* _WIN32 */
static HANDLE qemu_event_handle = NULL;
static void dummy_event_handler(void *opaque)
{
}
static int qemu_event_init(void)
{
qemu_event_handle = CreateEvent(NULL, FALSE, FALSE, NULL);
if (!qemu_event_handle) {
fprintf(stderr, "Failed CreateEvent: %ld\n", GetLastError());
return -1;
}
qemu_add_wait_object(qemu_event_handle, dummy_event_handler, NULL);
return 0;
}
void qemu_notify_event(void)
{
if (!qemu_event_handle) {
return;
}
if (!SetEvent(qemu_event_handle)) {
fprintf(stderr, "qemu_notify_event: SetEvent failed: %ld\n",
GetLastError());
exit(1);
}
}
static int qemu_signal_init(void)
{
return 0;
@ -202,6 +109,14 @@ static int qemu_signal_init(void)
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;
@ -216,12 +131,6 @@ int qemu_init_main_loop(void)
return ret;
}
/* Note eventfd must be drained before signalfd handlers run */
ret = qemu_event_init();
if (ret) {
return ret;
}
qemu_aio_context = aio_context_new();
src = aio_get_g_source(qemu_aio_context);
g_source_attach(src, NULL);
@ -411,7 +320,8 @@ void qemu_del_wait_object(HANDLE handle, WaitObjectFunc *func, void *opaque)
void qemu_fd_register(int fd)
{
WSAEventSelect(fd, qemu_event_handle, FD_READ | FD_ACCEPT | FD_CLOSE |
WSAEventSelect(fd, event_notifier_get_handle(&qemu_aio_context->notifier),
FD_READ | FD_ACCEPT | FD_CLOSE |
FD_CONNECT | FD_WRITE | FD_OOB);
}