added an experimental SpinLock class

qse/include/qse/si/Makefile.am

@@ -30,6 +30,7 @@ pkginclude_HEADERS += \
 	AppRoot.hpp \
 	SocketAddress.hpp \
 	Socket.hpp \
+	SpinLock.hpp \
 	Thread.hpp
 endif
 

qse/include/qse/si/Makefile.in

@@ -91,6 +91,7 @@ host_triplet = @host@
 @ENABLE_CXX_TRUE@	AppRoot.hpp \
 @ENABLE_CXX_TRUE@	SocketAddress.hpp \
 @ENABLE_CXX_TRUE@	Socket.hpp \
+@ENABLE_CXX_TRUE@	SpinLock.hpp \
 @ENABLE_CXX_TRUE@	Thread.hpp
 
 subdir = include/qse/si
@@ -133,7 +134,8 @@ am__can_run_installinfo = \
 am__pkginclude_HEADERS_DIST = aio.h aio-pro.h aio-sck.h cnd.h dir.h \
 	fio.h fs.h glob.h intr.h log.h mtx.h mux.h nwad.h nwif.h \
 	nwio.h pio.h rwl.h sck.h sinfo.h sio.h task.h thr.h tio.h \
-	AppRoot.hpp SocketAddress.hpp Socket.hpp Thread.hpp
+	AppRoot.hpp SocketAddress.hpp Socket.hpp SpinLock.hpp \
+	Thread.hpp
 am__vpath_adj_setup = srcdirstrip=`echo "$(srcdir)" | sed 's|.|.|g'`;
 am__vpath_adj = case $$p in \
     $(srcdir)/*) f=`echo "$$p" | sed "s|^$$srcdirstrip/||"`;; \

qse/include/qse/si/SpinLock.hpp

@@ -0,0 +1,77 @@
+/*
+ * $Id$
+ *
+    Copyright (c) 2006-2014 Chung, Hyung-Hwan. All rights reserved.
+
+    Redistribution and use in source and binary forms, with or without
+    modification, are permitted provided that the following conditions
+    are met:
+    1. Redistributions of source code must retain the above copyright
+       notice, this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright
+       notice, this list of conditions and the following disclaimer in the
+       documentation and/or other materials provided with the distribution.
+
+    THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EQSERESS OR
+    IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+    OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+    IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
+    INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+    NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+    DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+    THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+    (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+    THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _QSE_SI_SPINLOCK_CLASS_
+#define _QSE_SI_SPINLOCK_CLASS_
+
+#include <qse/Types.hpp>
+#include <qse/Uncopyable.hpp>
+
+QSE_BEGIN_NAMESPACE(QSE)
+
+
+class SpinLock
+{
+public:
+	bool tryock()
+	{
+		return !__sync_lock_test_and_set(&this->flag, 1);
+	}
+
+	void lock ()
+	{
+		//while (!this->tryLock());
+		while (__sync_lock_test_and_set(&this->flag, 1));
+	}
+
+	void unlock ()
+	{
+		__sync_lock_release (&this->flag);
+	}
+
+protected:
+	volatile int flag;
+};
+
+class ScopedSpinLock: public Uncopyable
+{
+	ScopedSpinLock (SpinLock& spl): spl(spl)
+	{
+		this->spl.lock ();
+	}
+
+	~ScopedSpinLock ()
+	{
+		this->spl.unlock ();
+	}
+
+protected:
+	SpinLock& spl;
+};
+
+QSE_END_NAMESPACE(QSE)
+
+#endif