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aio / timers: add ppoll support with qemu_poll_ns

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Add qemu_poll_ns which works like g_poll but takes a nanosecond
timeout.

Signed-off-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Alex Bligh 2013-08-21 16:02:43 +01:00 committed by Stefan Hajnoczi
parent 043a7e1f8f
commit 4e0c6529fc
3 changed files with 55 additions and 0 deletions
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19
configure vendored
View File

@ -2818,6 +2818,22 @@ if compile_prog "" "" ; then
dup3=yes
fi
# check for ppoll support
ppoll=no
cat > $TMPC << EOF
#include <poll.h>
int main(void)
{
struct pollfd pfd = { .fd = 0, .events = 0, .revents = 0 };
ppoll(&pfd, 1, 0, 0);
return 0;
}
EOF
if compile_prog "" "" ; then
ppoll=yes
fi
# check for epoll support
epoll=no
cat > $TMPC << EOF
@ -3814,6 +3830,9 @@ fi
if test "$dup3" = "yes" ; then
echo "CONFIG_DUP3=y" >> $config_host_mak
fi
if test "$ppoll" = "yes" ; then
echo "CONFIG_PPOLL=y" >> $config_host_mak
fi
if test "$epoll" = "yes" ; then
echo "CONFIG_EPOLL=y" >> $config_host_mak
fi

12
include/qemu/timer.h
View File

@ -63,6 +63,18 @@ int64_t qemu_clock_deadline_ns(QEMUClock *clock);
*/
int qemu_timeout_ns_to_ms(int64_t ns);
/**
* qemu_poll_ns:
* @fds: Array of file descriptors
* @nfds: number of file descriptors
* @timeout: timeout in nanoseconds
*
* Perform a poll like g_poll but with a timeout in nanoseconds.
* See g_poll documentation for further details.
*
* Returns: number of fds ready
*/
int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout);
void qemu_clock_enable(QEMUClock *clock, bool enabled);
void qemu_clock_warp(QEMUClock *clock);

24
qemu-timer.c
View File

@ -37,6 +37,10 @@
#include <mmsystem.h>
#endif
#ifdef CONFIG_PPOLL
#include <poll.h>
#endif
/***********************************************************/
/* timers */
@ -323,6 +327,26 @@ int qemu_timeout_ns_to_ms(int64_t ns)
}
/* qemu implementation of g_poll which uses a nanosecond timeout but is
* otherwise identical to g_poll
*/
int qemu_poll_ns(GPollFD *fds, guint nfds, int64_t timeout)
{
#ifdef CONFIG_PPOLL
if (timeout < 0) {
return ppoll((struct pollfd *)fds, nfds, NULL, NULL);
} else {
struct timespec ts;
ts.tv_sec = timeout / 1000000000LL;
ts.tv_nsec = timeout % 1000000000LL;
return ppoll((struct pollfd *)fds, nfds, &ts, NULL);
}
#else
return g_poll(fds, nfds, qemu_timeout_ns_to_ms(timeout));
#endif
}
QEMUTimer *qemu_new_timer(QEMUClock *clock, int scale,
QEMUTimerCB *cb, void *opaque)
{