X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;ds=sidebyside;f=platform%2Fwin32%2Ffunctions%2Fthreads%2Fmtx_trylock.c;fp=platform%2Fwin32%2Ffunctions%2Fthreads%2Fmtx_trylock.c;h=ebc5e85c3c3fbf806203756533b55c938947ad15;hb=a9f7a6b87674b6f413d4a9d0a258dd5f5c2df2b4;hp=0000000000000000000000000000000000000000;hpb=c436b5ffeb0f2108ce8cfd483f860125fccad79f;p=pdclib.old

diff --git a/platform/win32/functions/threads/mtx_trylock.c b/platform/win32/functions/threads/mtx_trylock.c
new file mode 100644
index 0000000..ebc5e85
--- /dev/null
+++ b/platform/win32/functions/threads/mtx_trylock.c
@@ -0,0 +1,33 @@
+#ifndef REGTEST
+#include <threads.h>
+#include <windows.h>
+
+int mtx_trylock(mtx_t *mtx)
+{
+    DWORD myId = GetCurrentThreadId();
+
+    if(mtx->_ThreadId == myId) {
+        mtx->_NestCount++;
+        return thrd_success;
+    }
+
+    if(mtx->_ThreadId != 0)
+        return thrd_busy;
+
+    LONG prev = InterlockedCompareExchange(&mtx->_ThreadId, myId, 0);
+    if(prev == 0)
+        return thrd_success;
+    else
+        return thrd_busy;
+}
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    return TEST_RESULTS;
+}
+
+#endif
\ No newline at end of file