added:

* win32_slim.h: includes the minimal version of windows.h
modified:
 * cthread: added lock_t c++ class
 * os: added getUserName()
 * socket: modified socket_len_t to sk_len_t to better follow naming convetions in file
 * str: added operator std::string() to str_t

cthreads.h

@@ -37,6 +37,31 @@ bool mtxLock(cmutex_t ctx);
 bool mtxTryLock(cmutex_t ctx);
 bool mtxUnlock(cmutex_t ctx);
 
+#ifdef __cplusplus
+// small c++ class to make mutexes easier to use
+struct lock_t {
+    inline lock_t(cmutex_t mutex)
+        : mutex(mutex) {
+        if (mtxValid(mutex)) {
+            mtxLock(mutex);
+        }
+    }
+
+    inline ~lock_t() {
+        unlock();
+    }
+
+    inline void unlock() {
+        if (mtxValid(mutex)) {
+            mtxUnlock(mutex);
+        }
+        mutex = 0;
+    }
+    
+    cmutex_t mutex;
+};
+#endif
+
 #ifdef __cplusplus
 } // extern "C"
 #endif