dns: fix workaround for systems defaulting to ipv6-only sockets

[musl] / src / thread / __lock.c

diff --git a/src/thread/__lock.c b/src/thread/__lock.c
index 5b9b144..60eece4 100644 (file)
--- a/src/thread/__lock.c
+++ b/src/thread/__lock.c
@@ -18,9 +18,11 @@
 
 void __lock(volatile int *l)
 {
-       if (!libc.threaded) return;
+       int need_locks = libc.need_locks;
+       if (!need_locks) return;
        /* fast path: INT_MIN for the lock, +1 for the congestion */
        int current = a_cas(l, 0, INT_MIN + 1);
+       if (need_locks < 0) libc.need_locks = 0;
        if (!current) return;
        /* A first spin loop, for medium congestion. */
        for (unsigned i = 0; i < 10; ++i) {