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-rw-r--r--libgo/runtime/thread-linux.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/libgo/runtime/thread-linux.c b/libgo/runtime/thread-linux.c
index 8dd5fc4b481..6a69fb429a4 100644
--- a/libgo/runtime/thread-linux.c
+++ b/libgo/runtime/thread-linux.c
@@ -3,6 +3,16 @@
// license that can be found in the LICENSE file.
#include "runtime.h"
+#include "defs.h"
+
+// Linux futex.
+//
+// futexsleep(uint32 *addr, uint32 val)
+// futexwakeup(uint32 *addr)
+//
+// Futexsleep atomically checks if *addr == val and if so, sleeps on addr.
+// Futexwakeup wakes up threads sleeping on addr.
+// Futexsleep is allowed to wake up spuriously.
#include <errno.h>
#include <string.h>