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-rw-r--r--libc-top-half/musl/src/internal/lock.h15
1 files changed, 15 insertions, 0 deletions
diff --git a/libc-top-half/musl/src/internal/lock.h b/libc-top-half/musl/src/internal/lock.h
new file mode 100644
index 0000000..29787fb
--- /dev/null
+++ b/libc-top-half/musl/src/internal/lock.h
@@ -0,0 +1,15 @@
+#ifndef LOCK_H
+#define LOCK_H
+
+#if defined(__wasilibc_unmodified_upstream) || defined(_REENTRANT)
+hidden void __lock(volatile int *);
+hidden void __unlock(volatile int *);
+#define LOCK(x) __lock(x)
+#define UNLOCK(x) __unlock(x)
+#else
+// No locking needed.
+#define LOCK(x) ((void)0)
+#define UNLOCK(x) ((void)0)
+#endif
+
+#endif