X-Git-Url: https://pd.if.org/git/?a=blobdiff_plain;f=platform%2Fwin32%2Ffunctions%2Fthreads%2Fmtx_unlock.c;fp=platform%2Fwin32%2Ffunctions%2Fthreads%2Fmtx_unlock.c;h=27b7aefadb7d6ff4a277c1e6fedadb27bca74e9d;hb=639bad513ab9399ed9a8c588a476a10dbe6c9478;hp=0000000000000000000000000000000000000000;hpb=008908f7a61acf9df1248c005378a3c4b4393547;p=pdclib

diff --git a/platform/win32/functions/threads/mtx_unlock.c b/platform/win32/functions/threads/mtx_unlock.c
new file mode 100644
index 0000000..27b7aef
--- /dev/null
+++ b/platform/win32/functions/threads/mtx_unlock.c
@@ -0,0 +1,39 @@
+#ifndef REGTEST
+#include <threads.h>
+#include <windows.h>
+
+extern void _PDCLIB_w32errno( void );
+int mtx_unlock(mtx_t *mtx)
+{
+    if(mtx->_NestCount) {
+        mtx->_NestCount--;
+        return thrd_success;
+    }
+
+    mtx->_ThreadId = 0;
+
+    DWORD res = InterlockedDecrement(&mtx->_State);
+    if(res == (DWORD) -1) {
+        // We reset the state to -1; success!
+        return thrd_success;
+    }
+
+    DWORD rv = SetEvent(mtx->_WaitEvHandle);
+    if(rv == 0) {
+        _PDCLIB_w32errno();
+        return thrd_error;
+    }
+
+    return thrd_success;
+}
+#endif
+
+#ifdef TEST
+#include <_PDCLIB_test.h>
+
+int main( void )
+{
+    return TEST_RESULTS;
+}
+
+#endif
\ No newline at end of file