Import Upstream version 2.0.0+dfsgupstream/2.0.0+dfsg

1 files changed, 49 insertions, 0 deletions

diff --git a/src/lib/mt/Lock.h b/src/lib/mt/Lock.h
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+++ b/src/lib/mt/Lock.h
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+/*
+ * barrier -- mouse and keyboard sharing utility
+ * Copyright (C) 2012-2016 Symless Ltd.
+ * Copyright (C) 2002 Chris Schoeneman
+ * 
+ * This package is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * found in the file LICENSE that should have accompanied this file.
+ * 
+ * This package 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#pragma once
+
+#include "common/common.h"
+
+class Mutex;
+class CondVarBase;
+
+//! Mutual exclusion lock utility
+/*!
+This class locks a mutex or condition variable in the c'tor and unlocks
+it in the d'tor.  It's easier and safer than manually locking and
+unlocking since unlocking must usually be done no matter how a function
+exits (including by unwinding due to an exception).
+*/
+class Lock {
+public:
+    //! Lock the mutex \c mutex
+    Lock(const Mutex* mutex);
+    //! Lock the condition variable \c cv
+    Lock(const CondVarBase* cv);
+    //! Unlock the mutex or condition variable
+    ~Lock();
+
+private:
+    // not implemented
+    Lock(const Lock&);
+    Lock& operator=(const Lock&);
+
+private:
+    const Mutex*        m_mutex;
+};