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# Date Author Comment
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...