From 1aa96dc0a112ffdec4fb62ac94625e56562b3cbe Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Thu, 26 Oct 2017 22:33:11 +0200
Subject: Add a RAII SpinLock (using boost's spinlock)

---
 libs/pbd/pbd/spinlock.h | 48 ++++++++++++++++++++++++++++++++++++++++++++++++
 libs/pbd/spinlock.cc    | 37 +++++++++++++++++++++++++++++++++++++
 libs/pbd/wscript        |  1 +
 3 files changed, 86 insertions(+)
 create mode 100644 libs/pbd/pbd/spinlock.h
 create mode 100644 libs/pbd/spinlock.cc

(limited to 'libs')

diff --git a/libs/pbd/pbd/spinlock.h b/libs/pbd/pbd/spinlock.h
new file mode 100644
index 0000000000..eb784ac6ce
--- /dev/null
+++ b/libs/pbd/pbd/spinlock.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifndef _pbd_spinlock_h_
+#define _pbd_spinlock_h_
+
+#include <boost/smart_ptr/detail/spinlock.hpp>
+#include "pbd/libpbd_visibility.h"
+
+namespace PBD {
+
+/* struct boost::detail::spinlock {
+ *   void lock();
+ *   bool try_lock();
+ *   void unlock();
+ * };
+ */
+typedef boost::detail::spinlock spinlock_t;
+
+/* RAII wrapper */
+class LIBPBD_API SpinLock {
+
+public:
+	SpinLock (spinlock_t&);
+	~SpinLock ();
+
+private:
+	spinlock_t& _lock;
+};
+
+} /* namespace */
+
+#endif /* _pbd_spinlock_h__ */
diff --git a/libs/pbd/spinlock.cc b/libs/pbd/spinlock.cc
new file mode 100644
index 0000000000..5892c2dd9c
--- /dev/null
+++ b/libs/pbd/spinlock.cc
@@ -0,0 +1,37 @@
+/*
+ * Copyright (C) 2017 Robin Gareus <robin@gareus.org>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ */
+
+#ifdef PLATFORM_WINDOWS
+#include <windows.h>
+#include <malloc.h>
+#endif
+
+#include "pbd/spinlock.h"
+
+using namespace PBD;
+
+SpinLock::SpinLock (spinlock_t& lock)
+	: _lock (lock)
+{
+	_lock.lock ();
+}
+
+SpinLock::~SpinLock ()
+{
+	_lock.unlock ();
+}
diff --git a/libs/pbd/wscript b/libs/pbd/wscript
index 29d82edcb4..cf4beba9fb 100644
--- a/libs/pbd/wscript
+++ b/libs/pbd/wscript
@@ -70,6 +70,7 @@ libpbd_sources = [
     'semutils.cc',
     'shortpath.cc',
     'signals.cc',
+    'spinlock.cc',
     'stacktrace.cc',
     'stateful_diff_command.cc',
     'stateful.cc',
-- 
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