Re: [Qemu-devel] [PATCH 2/3] Move threadlets infrastructure to qemu-threadlets.c

[Arun R Bharadwaj <arun@linux.vnet.ibm.com>]

* Blue Swirl <blauwirbel@gmail.com> [2010-11-10 17:29:30]:

> On Wed, Nov 10, 2010 at 1:19 PM, Arun R Bharadwaj
> <arun@linux.vnet.ibm.com> wrote:
> > The reason for creating this generic infrastructure is so that other subsystems,
> > such as virtio-9p could make use of it for offloading tasks that could block.
> >
> > Signed-off-by: Arun R Bharadwaj <arun@linux.vnet.ibm.com>
> > Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
> > Signed-off-by: Gautham R Shenoy <gautham.shenoy@gmail.com>
> > Signed-off-by: Sripathi Kodi <sripathik@in.ibm.com>
> > ---
> >  Makefile.objs          |    1
> >  docs/async-support.txt |  141 +++++++++++++++++++++++++++++++++++++++
> >  posix-aio-compat.c     |  173 ------------------------------------------------
> >  qemu-threadlets.c      |  168 +++++++++++++++++++++++++++++++++++++++++++++++
> >  qemu-threadlets.h      |   48 +++++++++++++
> >  5 files changed, 359 insertions(+), 172 deletions(-)
> >  create mode 100644 docs/async-support.txt
> >  create mode 100644 qemu-threadlets.c
> >  create mode 100644 qemu-threadlets.h
> >
> > diff --git a/qemu-threadlets.h b/qemu-threadlets.h
> > new file mode 100644
> > index 0000000..f869304
> > --- /dev/null
> > +++ b/qemu-threadlets.h
> > @@ -0,0 +1,48 @@
> > +/*
> > + * Threadlet support for offloading tasks to be executed asynchronously
> > + *
> > + * Copyright IBM, Corp. 2008
> > + * Copyright IBM, Corp. 2010
> > + *
> > + * Authors:
> > + *  Anthony Liguori     <aliguori@us.ibm.com>
> > + *  Aneesh Kumar K.V    <aneesh.kumar@linux.vnet.ibm.com>
> > + *  Gautham R Shenoy    <gautham.shenoy@gmail.com>
> > + *
> > + * This work is licensed under the terms of the GNU GPL, version 2.  See
> > + * the COPYING file in the top-level directory.
> > + */
> > +
> > +#ifndef QEMU_ASYNC_WORK_H
> > +#define QEMU_ASYNC_WORK_H
> > +
> > +#include "qemu-queue.h"
> > +#include "qemu-common.h"
> > +#include "qemu-thread.h"
> > +
> > +typedef struct ThreadletQueue
> > +{
> > +    QemuMutex lock;
> > +    QemuCond cond;
> > +    int max_threads;
> > +    int min_threads;
> > +    int cur_threads;
> > +    int idle_threads;
> > +    QTAILQ_HEAD(, ThreadletWork) request_list;
> > +} ThreadletQueue;
> > +
> > +typedef struct ThreadletWork
> > +{
> > +    QTAILQ_ENTRY(ThreadletWork) node;
> > +    void (*func)(struct ThreadletWork *work);
> > +} ThreadletWork;
> > +
> > +extern void submit_work_to_queue(ThreadletQueue *queue,
> > +                                 ThreadletWork *work);
> > +extern void submit_work(ThreadletWork *work);
> > +extern int dequeue_work_on_queue(ThreadletQueue *queue,
> > +                                 ThreadletWork *work);
> > +extern int dequeue_work(ThreadletWork *work);
> > +extern void threadlet_queue_init(ThreadletQueue *queue, int max_threads,
> > +                                 int min_threads);
> 
> Please remove 'extern' qualifiers, they are useless for function
> declarations. In most cases they are not used in QEMU.

Will change these. Thanks for the review.

-arun