Commit 67a74148 authored by Stefan Hajnoczi's avatar Stefan Hajnoczi
Browse files

queue: add QSIMPLEQ_PREPEND() 



QSIMPLEQ_CONCAT(a, b) joins a = a + b.  The new QSIMPLEQ_PREPEND(a, b)
API joins a = b + a.

Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-id: 20180322152834.12656-2-stefanha@redhat.com
Signed-off-by: default avatarStefan Hajnoczi <stefanha@redhat.com>
parent f58d9620

include/qemu/queue.h

+8 −0
Original line number Diff line number Diff line
@@ -324,6 +324,14 @@ struct { \ 
    }                                                                   \

} while (/*CONSTCOND*/0)



#define QSIMPLEQ_PREPEND(head1, head2) do {                             \

    if (!QSIMPLEQ_EMPTY((head2))) {                                     \

        *(head2)->sqh_last = (head1)->sqh_first;                        \

        (head1)->sqh_first = (head2)->sqh_first;                          \

        QSIMPLEQ_INIT((head2));                                         \

    }                                                                   \

} while (/*CONSTCOND*/0)



#define QSIMPLEQ_LAST(head, type, field)                                \

    (QSIMPLEQ_EMPTY((head)) ?                                           \

        NULL :                                                          \