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libpayload: queue: Add a helper macro for checking singleton queue 

Check if the simple queue consists of only 1 element.

BUG=b:24676003
BRANCH=None
TEST=Compiles successfully.

Change-Id: Ib257a5e6b9042b42c549f8ad8b943e3b75fd8c9c
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: 5435d6fec1c4fbb4c04ba5b8c15caff9ee4e50f0
Original-Change-Id: I7a8cb9c4e7e71956e85e65b3e7b8e0af4d354110
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/311256
Original-Commit-Ready: Furquan Shaikh <furquan@chromium.org>
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: http://review.coreboot.org/12412
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins)
This commit is contained in:
Furquan Shaikh 2015-11-06 22:20:15 -08:00 committed by Patrick Georgi
parent 685ab2a2f2
commit 1dcb10eeb6
1 changed files with 3 additions and 0 deletions
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3
payloads/libpayload/include/queue.h
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@ -268,6 +268,9 @@ struct { \
#define SIMPLEQ_END(head) NULL
#define SIMPLEQ_EMPTY(head) (SIMPLEQ_FIRST(head) == SIMPLEQ_END(head))
#define SIMPLEQ_NEXT(elm, field) ((elm)->field.sqe_next)
#define SIMPLEQ_TAIL_NEXT(head) ((head)->sqh_last)
#define SIMPLEQ_SINGLETON(head, field) \
(&SIMPLEQ_NEXT(SIMPLEQ_FIRST(head), field) == SIMPLEQ_TAIL_NEXT(head))
#define SIMPLEQ_FOREACH(var, head, field) \
for((var) = SIMPLEQ_FIRST(head); \