X-Git-Url: https://git.lttng.org/?a=blobdiff_plain;f=urcu-qsbr.c;h=428e9251c0b75f654c8ecd2a7f2edb0645d4839e;hb=refs%2Fheads%2Fstable-0.8;hp=b01294accd3fd0cdb3bbe5934b5cff582b4eabf0;hpb=3c29ca5d56988c3a10ba289a1129eadb4bf6b3ee;p=urcu.git

diff --git a/urcu-qsbr.c b/urcu-qsbr.c
index b01294a..428e925 100644
--- a/urcu-qsbr.c
+++ b/urcu-qsbr.c
@@ -126,9 +126,22 @@ static void wait_gp(void)
 {
 	/* Read reader_gp before read futex */
 	cmm_smp_rmb();
-	if (uatomic_read(&rcu_gp.futex) == -1)
-		futex_noasync(&rcu_gp.futex, FUTEX_WAIT, -1,
-		      NULL, NULL, 0);
+	if (uatomic_read(&rcu_gp.futex) != -1)
+		return;
+	while (futex_noasync(&rcu_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);
+		}
+	}
 }
 
 /*