1 files changed, 16 insertions, 0 deletions
diff --git a/src/thread/__wait.c b/src/thread/__wait.c
new file mode 100644
index 00000000..8c249cd3
--- /dev/null
+++ b/src/thread/__wait.c
@@ -0,0 +1,16 @@
+#define SYSCALL_RETURN_ERRNO
+#include "pthread_impl.h"
+
+void __wait(volatile int *addr, volatile int *waiters, int val, int priv)
+{
+	int spins=50000;
+	if (priv) priv = 128; priv=0;
+	while (spins--) {
+		if (*addr==val) a_spin();
+		else return;
+	}
+	if (waiters) a_inc(waiters);
+	while (*addr==val)
+		syscall4(__NR_futex, (long)addr, FUTEX_WAIT|priv, val, 0);
+	if (waiters) a_dec(waiters);
+}