extended ZSTDMT code support for non-MT systems and WIN32 (preliminary)
diff --git a/lib/common/threading.h b/lib/common/threading.h
new file mode 100644
index 0000000..a8126eb
--- /dev/null
+++ b/lib/common/threading.h
@@ -0,0 +1,79 @@
+
+/**
+ * Copyright (c) 2016 Tino Reichardt
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * You can contact the author at:
+ * - zstdmt source repository: https://github.com/mcmilk/zstdmt
+ */
+
+#ifndef THREADING_H_938743
+#define THREADING_H_938743
+
+#if defined (__cplusplus)
+extern "C" {
+#endif
+
+#if defined(ZSTD_PTHREAD) && defined(_WIN32)
+
+/**
+ * Windows minimalist Pthread Wrapper, based on :
+ * http://www.cse.wustl.edu/~schmidt/win32-cv-1.html
+ */
+
+#ifndef WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+
+/* mutex */
+#define pthread_mutex_t CRITICAL_SECTION
+#define pthread_mutex_init(a,b) InitializeCriticalSection((a))
+#define pthread_mutex_destroy(a) DeleteCriticalSection((a))
+#define pthread_mutex_lock EnterCriticalSection
+#define pthread_mutex_unlock LeaveCriticalSection
+
+/* pthread_create() and pthread_join() */
+typedef struct {
+ HANDLE handle;
+ void* (*start_routine)(void*);
+ void*varg;
+} pthread_t;
+
+int pthread_create(pthread_t* thread, const void* unused,
+ void* (*start_routine) (void*), void* arg);
+
+#define pthread_join(a, b) _pthread_join(&(a), (b))
+int _pthread_join(pthread_t* thread, void** value_ptr);
+
+/**
+ * add here more wrappers as required
+ */
+
+
+#elif defined(ZSTD_PTHREAD) /* posix assumed ; need a better detection mathod */
+/* === POSIX Systems === */
+# include <pthread.h>
+
+#else /* ZSTD_PTHREAD not defined */
+/* No multithreading support */
+
+typedef int pthread_mutex_t;
+#define pthread_mutex_init(a,b)
+#define pthread_mutex_destroy(a)
+#define pthread_mutex_lock(a)
+#define pthread_mutex_unlock(a)
+
+/* do not use pthread_t */
+
+#endif /* ZSTD_PTHREAD */
+
+#if defined (__cplusplus)
+}
+#endif
+
+#endif /* THREADING_H_938743 */