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[Qemu-devel] [PATCH 03/11] poller: add poller_fill() and poller_poll()
From: |
Stefan Hajnoczi |
Subject: |
[Qemu-devel] [PATCH 03/11] poller: add poller_fill() and poller_poll() |
Date: |
Thu, 31 Jan 2013 11:53:56 +0100 |
The Windows event loop cannot be converted entirely to g_poll(3). It
will still need select(2) so add functions that convert between Poller
and rfds/wfds/xfds. This way most code only needs to be aware of Poller
but it will still be possible to invoke select(2).
Signed-off-by: Stefan Hajnoczi <address@hidden>
---
include/qemu/poller.h | 12 ++++++++++++
util/poller.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 58 insertions(+)
diff --git a/include/qemu/poller.h b/include/qemu/poller.h
index 7630099..39e07d2 100644
--- a/include/qemu/poller.h
+++ b/include/qemu/poller.h
@@ -53,4 +53,16 @@ int poller_add_fd(Poller *p, int fd, int events);
*/
int poller_get_revents(Poller *p, int index);
+/**
+ * poller_fill: Fill fd_sets from a Poller
+ *
+ * Return the maximum file descriptor number.
+ */
+int poller_fill(Poller *p, fd_set *rfds, fd_set *wfds, fd_set *xfds);
+
+/**
+ * poller_poll: Bitwise OR fd_set results into Poller revents
+ */
+void poller_poll(Poller *p, int nfds, fd_set *rfds, fd_set *wfds, fd_set
*xfds);
+
#endif /* QEMU_POLLER_H */
diff --git a/util/poller.c b/util/poller.c
index 663e7a9..41e9b96 100644
--- a/util/poller.c
+++ b/util/poller.c
@@ -52,3 +52,49 @@ int poller_get_revents(Poller *p, int index)
assert(index < p->nfds);
return p->poll_fds[index].revents;
}
+
+int poller_fill(Poller *p, fd_set *rfds, fd_set *wfds, fd_set *xfds)
+{
+ int nfds = -1;
+ int i;
+
+ for (i = 0; i < p->nfds; i++) {
+ int fd = p->poll_fds[i].fd;
+ int events = p->poll_fds[i].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;
+}
+
+void poller_poll(Poller *p, int nfds, fd_set *rfds, fd_set *wfds, fd_set *xfds)
+{
+ int i;
+
+ for (i = 0; i < p->nfds; i++) {
+ int fd = p->poll_fds[i].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;
+ }
+ revents &= p->poll_fds[i].events;
+ p->poll_fds[i].revents |= revents;
+ }
+}
--
1.8.1
- [Qemu-devel] [PATCH 00/11] main-loop: switch to g_poll(3) on POSIX hosts, Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 03/11] poller: add poller_fill() and poller_poll(),
Stefan Hajnoczi <=
- [Qemu-devel] [PATCH 04/11] main-loop: switch to g_poll() on POSIX hosts, Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 05/11] main-loop: switch POSIX glib integration to Poller, Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 07/11] iohandler: switch to Poller, Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 08/11] main-loop: drop rfds/wfds/xfds for good, Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 06/11] slirp: switch to Poller, Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 09/11] aio: extract aio_dispatch() from aio_poll(), Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 10/11] aio: convert aio_poll() to g_poll(3), Stefan Hajnoczi, 2013/01/31
- [Qemu-devel] [PATCH 11/11] aio: support G_IO_HUP and G_IO_ERR, Stefan Hajnoczi, 2013/01/31