From 0a22716b74d52fcbef37bebf529048f7f3bc79e0 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 23 Apr 2009 17:43:39 +0000
Subject: [PATCH] new file to encapsulate posix_memalign() hackery

git-svn-id: svn://localhost/ardour2/branches/3.0@4998 d708f5d6-7413-0410-9779-e7cbd77b26cf
---
 libs/pbd/malign.cc    | 35 +++++++++++++++++++++++++++++++++++
 libs/pbd/pbd/malign.h |  8 ++++++++
 2 files changed, 43 insertions(+)
 create mode 100644 libs/pbd/malign.cc
 create mode 100644 libs/pbd/pbd/malign.h

diff --git a/libs/pbd/malign.cc b/libs/pbd/malign.cc
new file mode 100644
index 0000000000..cd3459a8b2
--- /dev/null
+++ b/libs/pbd/malign.cc
@@ -0,0 +1,35 @@
+#include <cstring>
+#include <cerrno>
+
+#include "pbd/malign.h"
+#include "pbd/error.h"
+
+#include "i18n.h"
+
+using namespace PBD;
+
+#ifdef __x86_64__
+static const int CPU_CACHE_ALIGN = 64;
+#else
+static const int CPU_CACHE_ALIGN = 16; /* arguably 32 on most arches, but it matters less */
+#endif
+
+int cache_aligned_malloc (void** memptr, size_t size)
+{
+#ifdef NO_POSIX_MEMALIGN
+	if (((*memptr) = malloc (size)) == 0) {
+		fatal << string_compose (_("Memory allocation error: malloc (%1 * %2) failed (%3)"),
+					 CPU_CACHE_ALIGN, size, strerror (errno)) << endmsg;
+		return errno;
+	} else {
+		return 0;
+	}
+#else
+        if (posix_memalign (memptr, CPU_CACHE_ALIGN, size)) {
+		fatal << string_compose (_("Memory allocation error: posix_memalign (%1 * %2) failed (%3)"),
+					 CPU_CACHE_ALIGN, size, strerror (errno)) << endmsg;
+	}
+
+	return 0;
+#endif	
+}
diff --git a/libs/pbd/pbd/malign.h b/libs/pbd/pbd/malign.h
new file mode 100644
index 0000000000..97e68c076e
--- /dev/null
+++ b/libs/pbd/pbd/malign.h
@@ -0,0 +1,8 @@
+#ifndef __pbd_malign_h__
+#define __pbd_malign_h__
+
+#include <stdlib.h>
+
+int cache_aligned_malloc (void** memptr, size_t size);
+
+#endif /* __pbd_malign_h__ */