X-Git-Url: http://git.lttng.org/?a=blobdiff_plain;f=urcu-qsbr.c;h=52cb04aee9ff1b1b5a7b2caef45d6d5b5317ba77;hb=11eb040f24e020d05d65983d0f87f79b000c7b9f;hp=1a94efa61a47fc48e12f9fc671b7c147d29382b4;hpb=a99b1455f89d4b214afcee19799776b45afcfed2;p=userspace-rcu.git

diff --git a/urcu-qsbr.c b/urcu-qsbr.c
index 1a94efa..52cb04a 100644
--- a/urcu-qsbr.c
+++ b/urcu-qsbr.c
@@ -125,9 +125,22 @@ static void wait_gp(void)
 {
 	/* Read reader_gp before read futex */
 	cmm_smp_rmb();
-	if (uatomic_read(&gp_futex) == -1)
-		futex_noasync(&gp_futex, FUTEX_WAIT, -1,
-		      NULL, NULL, 0);
+	if (uatomic_read(&gp_futex) != -1)
+		return;
+	while (futex_noasync(&gp_futex, FUTEX_WAIT, -1,
+			NULL, NULL, 0)) {
+		switch (errno) {
+		case EWOULDBLOCK:
+			/* Value already changed. */
+			return;
+		case EINTR:
+			/* Retry if interrupted by signal. */
+			break;	/* Get out of switch. */
+		default:
+			/* Unexpected error. */
+			urcu_die(errno);
+		}
+	}
 }
 
 /*