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# Date Author Comment
ceb42de8 04/07/2009 09:43 pm aliguori

native preadv/pwritev support (Christoph Hellwig)

This ties up the preadv/pwritev syscalls to qemu if they are declared in
unistd.h. This is the case currently on at least NetBSD and OpenBSD and
will hopefully soon be the case on Linux.

Thanks to Blue Swirl and Gerd Hoffmann for the configure autodetection...
f141eafe 04/07/2009 09:43 pm aliguori

push down vector linearization to posix-aio-compat.c (Christoph Hellwig)

Make all AIO requests vectored and defer linearization until the actual
I/O thread. This prepares for using native preadv/pwritev.

Also enables asynchronous direct I/O by handling that case in the I/O thread....
221f715d 03/28/2009 07:28 pm aliguori

new scsi-generic abstraction, use SG_IO (Christoph Hellwig)

Okay, I started looking into how to handle scsi-generic I/O in the
new world order.

I think the best is to use the SG_IO ioctl instead of the read/write
interface as that allows us to support scsi passthrough on disk/cdrom...
514f7a27 02/21/2009 07:48 am malc

Properly handle pthread_cond_timedwait timing out

pthread_cond_timedwait is allowed to both consume the signal and
return with the value indicating the timeout, hence predicate should
always be (re)checked before taking an action

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6634 c046a42c-6fe2-441c-8c8c-71466251a162
a8227a5a 02/21/2009 07:48 am malc

Cosmetics

Avoid repeated creation/initalization/destruction of attr and calls to
getpid

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6633 c046a42c-6fe2-441c-8c8c-71466251a162
5d47e372 02/21/2009 07:48 am malc

Avoid thundering herd problem

Broadcast was used so that the I/O threads would wakeup, reset their
ts values and all but one go to sleep, in other words an optimization
to prevent threads from exiting in presence of continuing I/O
activity. Spurious wakeups make the looping around cond_timedwait with...
30525aff 02/21/2009 07:48 am malc

Avoid infinite loop around timed condition variable

This can happen due to spurious wakeups

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6631 c046a42c-6fe2-441c-8c8c-71466251a162
8653c015 02/21/2009 07:48 am malc

Error checking

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6630 c046a42c-6fe2-441c-8c8c-71466251a162
55f11ca3 01/24/2009 01:54 pm blueswir1

Rename sigev_signo to avoid FreeBSD problems (Juergen Lock)

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6414 c046a42c-6fe2-441c-8c8c-71466251a162
c9db92fc 01/17/2009 08:49 am blueswir1

Use kill instead of sigqueue: re-enables AIO on OpenBSD

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6360 c046a42c-6fe2-441c-8c8c-71466251a162
f094a782 01/13/2009 05:13 pm aliguori

Fix race in POSIX AIO emulation (Jan Kiszka)

When we cancel an AIO request that is already being processed by
aio_thread, qemu_paio_cancel should return QEMU_PAIO_NOTCANCELED as long
as aio_thread isn't done with this request. But as the latter currently...
1d6198c3 12/13/2008 11:32 am blueswir1

Remove unnecessary trailing newlines

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6000 c046a42c-6fe2-441c-8c8c-71466251a162
3c529d93 12/12/2008 06:41 pm aliguori

Replace posix-aio with custom thread pool

glibc implements posix-aio as a thread pool and imposes a number of limitations.

1) it limits one request per-file descriptor. we hack around this by dup()'ing
file descriptors which is hideously ugly

2) it's impossible to add new interfaces and we need a vectored read/write...