X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=functions%2Fstdio%2Fftrylockfile.c;fp=functions%2Fstdio%2Fftrylockfile.c;h=cb8147abd12b591b5a0f291c0dbe7c824c26ff24;hb=026148e2e90368c0b23192f506e15aa6197105aa;hp=0000000000000000000000000000000000000000;hpb=e70d680319ea23460b891e14259f2f6b3a568291;p=pdclib

diff --git a/functions/stdio/ftrylockfile.c b/functions/stdio/ftrylockfile.c
new file mode 100644
index 0000000..cb8147a
--- /dev/null
+++ b/functions/stdio/ftrylockfile.c
@@ -0,0 +1,39 @@
+/* ftrylockfile(FILE * )
+
+   This file is part of the Public Domain C Library (PDCLib).
+   Permission is granted to use, modify, and / or redistribute at will.
+*/
+
+#include <stdio.h>
+#include <stdarg.h>
+
+#ifndef REGTEST
+#include <threads.h>
+#include <stdlib.h>
+
+int ftrylockfile( FILE * file )
+{
+    int res = mtx_trylock( &file->lock );
+    switch(res) {
+        case thrd_success:
+            return 0;
+        case thrd_busy:
+            return 1;
+
+        default:
+            abort();
+    }
+}
+
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    // Not tested here - tested by other stdio test drivers
+    return TEST_RESULTS;
+}
+
+#endif