X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=platform%2Fwin32%2Ffunctions%2Fthreads%2Fmtx_lock.c;fp=platform%2Fwin32%2Ffunctions%2Fthreads%2Fmtx_lock.c;h=70af8ae35bd7cd65c7785527544d7cf7778e2776;hb=639bad513ab9399ed9a8c588a476a10dbe6c9478;hp=0000000000000000000000000000000000000000;hpb=008908f7a61acf9df1248c005378a3c4b4393547;p=pdclib

diff --git a/platform/win32/functions/threads/mtx_lock.c b/platform/win32/functions/threads/mtx_lock.c
new file mode 100644
index 0000000..70af8ae
--- /dev/null
+++ b/platform/win32/functions/threads/mtx_lock.c
@@ -0,0 +1,40 @@
+#ifndef REGTEST
+#include <threads.h>
+#include <windows.h>
+
+int mtx_lock(mtx_t *mtx)
+{
+    DWORD myId = GetCurrentThreadId();
+
+    if(mtx->_ThreadId == myId) {
+        mtx->_NestCount++;
+        return thrd_success;
+    }
+
+    DWORD res = InterlockedIncrement(&mtx->_State);
+    if(res == 0) {
+        mtx->_ThreadId = myId;
+        return thrd_success;
+    }
+
+    // If that increment didn't leave the state == 0, then we have contention
+    //  -> block on the wait event handle
+    DWORD rv = WaitForSingleObject(mtx->_WaitEvHandle, INFINITE);
+    if(rv != WAIT_OBJECT_0) 
+        return thrd_error;
+
+    // We now own the mutex - so set it up for our use
+    mtx->_ThreadId = myId;
+    return thrd_success;
+}
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    return TEST_RESULTS;
+}
+
+#endif
\ No newline at end of file