use JACK thread creation functions to create process-graph threads; provide GUI control over number of threads-relative-to-number-of-CPUS

git-svn-id: svn://localhost/ardour2/branches/3.0@7296 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 49 insertions, 0 deletions

diff --git a/libs/pbd/cpus.cc b/libs/pbd/cpus.cc
new file mode 100644
index 0000000000..ba4ba32fe4
--- /dev/null
+++ b/libs/pbd/cpus.cc
@@ -0,0 +1,49 @@
+/*
+  Copyright (C) 2010 Paul Davis
+  Author: Torben Hohn
+
+  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., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#ifdef WAF_BUILD
+#include "libpbd-config.h"
+#endif
+
+#ifdef __linux__
+#include <unistd.h>
+#elif defined(__APPLE__) || defined(__FreeBSD__)
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#endif
+
+#include "pbd/cpus.h"
+
+uint32_t
+hardware_concurrency()
+{
+#if defined(PTW32_VERSION) || defined(__hpux)
+        return pthread_num_processors_np();
+#elif defined(__APPLE__) || defined(__FreeBSD__)
+        int count;
+        size_t size=sizeof(count);
+        return sysctlbyname("hw.ncpu",&count,&size,NULL,0)?0:count;
+#elif defined(HAVE_UNISTD) && defined(_SC_NPROCESSORS_ONLN)
+        int const count=sysconf(_SC_NPROCESSORS_ONLN);
+        return (count>0)?count:0;
+#else
+        return 0;
+#endif
+}