Add PISpinlock and PISpinlockLocker

libs/main/thread/pispinlock.cpp

@@ -0,0 +1,30 @@
+/*
+	PIP - Platform Independent Primitives
+	PISpinlock
+	Ivan Pelipenko peri4ko@yandex.ru
+
+	This program is free software: you can redistribute it and/or modify
+	it under the terms of the GNU Lesser General Public License as published by
+	the Free Software Foundation, either version 3 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU Lesser General Public License for more details.
+
+	You should have received a copy of the GNU Lesser General Public License
+	along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+/** \class PISpinlock
+ * \brief Spinlock
+ * \details
+ * \section PISpinlock_sec0 Synopsis
+ * %PISpinlock provides synchronization blocks between several threads.
+ * PISpinlock functionality similar to PIMutex, but working on atomic
+ * type and \a lock() method wait with 100% CPU load.
+ * \note
+ * Use this type instead of PIMutex when less waiting time is more
+ * important than CPU load!
+ * */