Message ID | 1474989516-18255-2-git-send-email-stefanha@redhat.com (mailing list archive) |
---|---|
State | New, archived |
Headers | show |
On Tue, 09/27 16:18, Stefan Hajnoczi wrote: > See the doc comments for a description of this new coroutine API. > > Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> > --- > include/qemu/coroutine.h | 13 +++++++++++++ > util/qemu-coroutine.c | 5 +++++ > 2 files changed, 18 insertions(+) > > diff --git a/include/qemu/coroutine.h b/include/qemu/coroutine.h > index 29a2078..e6a60d5 100644 > --- a/include/qemu/coroutine.h > +++ b/include/qemu/coroutine.h > @@ -92,6 +92,19 @@ Coroutine *coroutine_fn qemu_coroutine_self(void); > */ > bool qemu_in_coroutine(void); > > +/** > + * Return true if the coroutine is currently entered > + * > + * A coroutine is "entered" if it has not yielded from the current > + * qemu_coroutine_enter() call used to run it. This does not mean that the > + * coroutine is currently executing code since it may have transferred control > + * to another coroutine using qemu_coroutine_enter(). > + * > + * When several coroutines enter each other there may be no way to know which > + * ones have already been entered. In such situations this function can be > + * used to avoid recursively entering coroutines. > + */ > +bool qemu_coroutine_entered(Coroutine *co); > > > /** > diff --git a/util/qemu-coroutine.c b/util/qemu-coroutine.c > index 3cbf225..737bffa 100644 > --- a/util/qemu-coroutine.c > +++ b/util/qemu-coroutine.c > @@ -146,3 +146,8 @@ void coroutine_fn qemu_coroutine_yield(void) > self->caller = NULL; > qemu_coroutine_switch(self, to, COROUTINE_YIELD); > } > + > +bool qemu_coroutine_entered(Coroutine *co) > +{ > + return co->caller; > +} > -- > 2.7.4 > Reviewed-by: Fam Zheng <famz@redhat.com>
diff --git a/include/qemu/coroutine.h b/include/qemu/coroutine.h index 29a2078..e6a60d5 100644 --- a/include/qemu/coroutine.h +++ b/include/qemu/coroutine.h @@ -92,6 +92,19 @@ Coroutine *coroutine_fn qemu_coroutine_self(void); */ bool qemu_in_coroutine(void); +/** + * Return true if the coroutine is currently entered + * + * A coroutine is "entered" if it has not yielded from the current + * qemu_coroutine_enter() call used to run it. This does not mean that the + * coroutine is currently executing code since it may have transferred control + * to another coroutine using qemu_coroutine_enter(). + * + * When several coroutines enter each other there may be no way to know which + * ones have already been entered. In such situations this function can be + * used to avoid recursively entering coroutines. + */ +bool qemu_coroutine_entered(Coroutine *co); /** diff --git a/util/qemu-coroutine.c b/util/qemu-coroutine.c index 3cbf225..737bffa 100644 --- a/util/qemu-coroutine.c +++ b/util/qemu-coroutine.c @@ -146,3 +146,8 @@ void coroutine_fn qemu_coroutine_yield(void) self->caller = NULL; qemu_coroutine_switch(self, to, COROUTINE_YIELD); } + +bool qemu_coroutine_entered(Coroutine *co) +{ + return co->caller; +}
See the doc comments for a description of this new coroutine API. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> --- include/qemu/coroutine.h | 13 +++++++++++++ util/qemu-coroutine.c | 5 +++++ 2 files changed, 18 insertions(+)