--- parser3/src/include/pa_threads.h	2001/01/29 11:17:49	1.1
+++ parser3/src/include/pa_threads.h	2001/05/17 10:42:56	1.15
@@ -1,37 +1,66 @@
-/*
-  $Id: pa_threads.h,v 1.1 2001/01/29 11:17:49 paf Exp $
+/** @file
+	Parser: mutex & helpers decls.
+
+	Copyright (c) 2001 ArtLebedev Group (http://www.artlebedev.com)
+
+	Author: Alexander Petrosyan <paf@design.ru> (http://design.ru/paf)
+
+	$Id: pa_threads.h,v 1.15 2001/05/17 10:42:56 parser Exp $
 */
 
 #ifndef PA_THREADS_H
 #define PA_THREADS_H
 
-#ifdef HAVE_CONFIG_H
-#	include "pa_config.h"
-#endif
-
+#include "pa_config_includes.h"
 #include "pa_types.h"
 
 
 #ifdef MULTITHREAD
 
+class AutoSYNCHRONIZED;
+
+/// simple semaphore object
 class Mutex {
+	friend AutoSYNCHRONIZED;
+private:
 	uint handle;
 public:
 	Mutex();
 	~Mutex();
-	void lock();
-	void unlock();
+private: // for AutoSYNCHRONIZED
+	void acquire();
+	void release();
 };
 
-#else
+extern Mutex global_mutex;
 
-class Mutex {
-	Mutex() {}
-	~Mutex() {}
-	void lock() {}
-	void unlock() {}
+/** 
+	Helper to ensure paired Mutex::acquire() and Mutex::release().
+
+	Use it with SYNCHRONIZED macro
+*/
+class AutoSYNCHRONIZED {
+public:
+	AutoSYNCHRONIZED() { global_mutex.acquire(); }
+	~AutoSYNCHRONIZED() { global_mutex.release(); }
 };
 
+/** 
+	put it to first line of a function to ensure thread safety.
+	@verbatim
+		void someclass::somefunc(...) { SYNCHRONIZED;
+			...
+		}
+	@endverbatim
+
+	WARNING: don't use THROW or PTHROW with such thread safety mechanizm -
+	longjmp would leave global_mutex acquired, which is wrong!
+*/
+#	define SYNCHRONIZED AutoSYNCHRONIZED autoSYNCHRONIZED
+#else
+	// not MULTITHREAD-ed, do nothing
+#	define SYNCHRONIZED
 #endif
 
+
 #endif