intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 35 insertions, 0 deletions

diff --git a/util/system/flock.h b/util/system/flock.h
new file mode 100644
index 0000000000..797b1970a1
--- /dev/null
+++ b/util/system/flock.h
@@ -0,0 +1,35 @@
+#pragma once
+
+#include "error.h"
+#include "defaults.h"
+#include "file.h"
+
+#if defined(_unix_)
+
+    #include <sys/file.h>
+    #include <fcntl.h>
+
+static inline int Flock(int fd, int op) {
+    return flock(fd, op);
+}
+
+#else // not _unix_
+
+    #ifdef __cplusplus
+extern "C" {
+    #endif
+
+    #define LOCK_SH 1 /* shared lock */
+    #define LOCK_EX 2 /* exclusive lock */
+    #define LOCK_NB 4 /* don't block when locking */
+    #define LOCK_UN 8 /* unlock */
+
+    int Flock(void* hndl, int operation);
+    int flock(int fd, int operation);
+    int fsync(int fd);
+
+    #ifdef __cplusplus
+}
+    #endif
+
+#endif // not _unix_