[Devel] [PATCH 4/4] cr_tests: futex: pi: Set the FUTEX_WAITERS bit.

[Matt Helsley]

Need to indicate to the kernel that we're waiting on the futex.
(See kernel source Documentation/pi-futex.txt).

Signed-off-by: Matt Helsley <matthltc at us.ibm.com>
---
 futex/pi.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/futex/pi.c b/futex/pi.c
index a39964d..695eb0a 100644
--- a/futex/pi.c
+++ b/futex/pi.c
@@ -271,6 +271,7 @@ int do_lock_contended_pi_futex(int retries)
 {
 	int do_print = 1;
 
+	__sync_or_and_fetch(&pi_futex->counter, FUTEX_WAITERS);
 again:
 	if (futex(&pi_futex->counter, FUTEX_LOCK_PI, atomic_read(pi_futex),
 	      NULL, NULL, 0) == 0)
-- 
1.6.3.3

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