From d0ae3caca5828675335d3b19ab5dd987e7369b23 Mon Sep 17 00:00:00 2001
From: Tim Blechmann <timblech@users.sourceforge.net>
Date: Wed, 14 Jul 2004 16:21:44 +0000
Subject: This commit was generated by cvs2svn to compensate for changes in
 r1857, which included commits to RCS files with non-trunk default branches.

svn path=/trunk/externals/tb/; revision=1858
---
 sc4pd/headers/server/IntFifo.h | 87 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 87 insertions(+)
 create mode 100644 sc4pd/headers/server/IntFifo.h

(limited to 'sc4pd/headers/server/IntFifo.h')

diff --git a/sc4pd/headers/server/IntFifo.h b/sc4pd/headers/server/IntFifo.h
new file mode 100644
index 0000000..3dde5ec
--- /dev/null
+++ b/sc4pd/headers/server/IntFifo.h
@@ -0,0 +1,87 @@
+/*
+	SuperCollider real time audio synthesis system
+    Copyright (c) 2002 James McCartney. All rights reserved.
+	http://www.audiosynth.com
+
+    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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+#ifndef _IntFifo_
+#define _IntFifo_
+
+#ifdef SC_DARWIN
+# include <CoreServices/CoreServices.h>
+#endif
+
+template <int N>
+class IntFifo
+{
+public:
+	IntFifo()
+			: mMask(N - 1), mReadHead(0), mWriteHead(0)
+	{}
+
+	void MakeEmpty() { mReadHead = mWriteHead; }
+	bool IsEmpty() { return mReadHead == mWriteHead; }
+	bool HasData() { return mReadHead != mWriteHead; }
+
+	bool Put(int data)
+	{
+		long next = NextPos(mWriteHead);
+		if (next == mReadHead) return false; // fifo is full
+		mItems[next] = data;
+#ifdef SC_DARWIN
+		// we don't really need a compare and swap, but this happens to call 
+		// the PowerPC memory barrier instruction lwsync.
+		CompareAndSwap(mWriteHead, next, &mWriteHead);
+#elif defined SC_WIN32
+    InterlockedExchange(reinterpret_cast<volatile LONG*>(&mWriteHead),next);
+#else
+		mWriteHead = next;
+#endif
+		return true;
+	}
+
+	int32 Get()
+	{
+		//assert(HasData());
+		long next = NextPos(mReadHead);
+		out = mItems[next].Perform();
+#ifdef SC_DARWIN
+		// we don't really need a compare and swap, but this happens to call 
+		// the PowerPC memory barrier instruction lwsync.
+		CompareAndSwap(mReadHead, next, &mReadHead);
+#elif defined SC_WIN32
+    InterlockedExchange(reinterpret_cast<volatile LONG*>(&mReadHead),next);
+#else
+		mReadHead = next;
+#endif
+	}
+
+private:
+	int NextPos(int inPos) { return (inPos + 1) & mMask; }
+
+	long mMask;
+#ifdef SC_DARWIN
+	UInt32 mReadHead, mWriteHead;
+#else
+	volatile int mReadHead, mWriteHead;
+#endif
+	int32 mItems[N];
+};
+
+#endif
+
+
-- 
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