Commit f643e469 authored by Stefan Hajnoczi's avatar Stefan Hajnoczi
Browse files

coroutine: add qemu_coroutine_entered() function 



See the doc comments for a description of this new coroutine API.

Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: default avatarFam Zheng <famz@redhat.com>
Message-id: 1474989516-18255-2-git-send-email-stefanha@redhat.com
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent 844c8229

include/qemu/coroutine.h

+13 −0
Original line number Diff line number Diff line
@@ -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);





/**

util/qemu-coroutine.c

+5 −0
Original line number Diff line number Diff line
@@ -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;

}