Re: [Qemu-devel] [PATCH v5 01/15] coroutine: add co_sleep_ns() coroutine sleep function

[Kevin Wolf <kwolf@redhat.com>]

Am 17.01.2012 14:31, schrieb Stefan Hajnoczi:
> On Tue, Jan 17, 2012 at 12:54 PM, Kevin Wolf <kwolf@redhat.com> wrote:
>> Am 13.01.2012 14:14, schrieb Stefan Hajnoczi:
>>> Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
>>> ---
>>>  Makefile.objs          |    1 +
>>>  qemu-coroutine-sleep.c |   38 ++++++++++++++++++++++++++++++++++++++
>>>  qemu-coroutine.h       |    9 +++++++++
>>>  3 files changed, 48 insertions(+), 0 deletions(-)
>>>  create mode 100644 qemu-coroutine-sleep.c
>>>
>>> diff --git a/Makefile.objs b/Makefile.objs
>>> index 4f6d26c..f4f52e0 100644
>>> --- a/Makefile.objs
>>> +++ b/Makefile.objs
>>> @@ -13,6 +13,7 @@ oslib-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o
>>>  #######################################################################
>>>  # coroutines
>>>  coroutine-obj-y = qemu-coroutine.o qemu-coroutine-lock.o qemu-coroutine-io.o
>>> +coroutine-obj-y += qemu-coroutine-sleep.o
>>>  ifeq ($(CONFIG_UCONTEXT_COROUTINE),y)
>>>  coroutine-obj-$(CONFIG_POSIX) += coroutine-ucontext.o
>>>  else
>>> diff --git a/qemu-coroutine-sleep.c b/qemu-coroutine-sleep.c
>>> new file mode 100644
>>> index 0000000..fd65274
>>> --- /dev/null
>>> +++ b/qemu-coroutine-sleep.c
>>> @@ -0,0 +1,38 @@
>>> +/*
>>> + * QEMU coroutine sleep
>>> + *
>>> + * Copyright IBM, Corp. 2011
>>> + *
>>> + * Authors:
>>> + *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
>>> + *
>>> + * This work is licensed under the terms of the GNU LGPL, version 2 or later.
>>> + * See the COPYING.LIB file in the top-level directory.
>>> + *
>>> + */
>>> +
>>> +#include "qemu-coroutine.h"
>>> +#include "qemu-timer.h"
>>> +
>>> +typedef struct CoSleepCB {
>>> +    QEMUTimer *ts;
>>> +    Coroutine *co;
>>> +} CoSleepCB;
>>> +
>>> +static void co_sleep_cb(void *opaque)
>>> +{
>>> +    CoSleepCB *sleep_cb = opaque;
>>> +
>>> +    qemu_free_timer(sleep_cb->ts);
>>
>> I think you need to call qemu_del_timer() first.
> 
> I think we're okay with just qemu_free_timer().  qemu_run_timers()
> removes the timer from the active_timers list before invoking its
> callback.  qemu_del_timer() is not needed because it just searches the
> active_timers list and removes the timer, if found.  We're no longer
> on the active_timers list at the point when co_sleep_cb() is called,
> so there's no need.

Yes, seems you're right. qemu_del_timer() isn't a good name...

Kevin