[beast: 5/6] BSE: adjust number of slave DSP threads to the number of available CPU cores

[Tim Janik <timj src gnome org>]

commit c38f9d646e2453cf619122983f7aed3030ee6e1e
Author: Tim Janik <timj gnu org>
Date:   Sun Nov 6 23:23:28 2016 +0100

    BSE: adjust number of slave DSP threads to the number of available CPU cores
    
    Signed-off-by: Tim Janik <timj gnu org>

 bse/bseenginemaster.cc |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/bse/bseenginemaster.cc b/bse/bseenginemaster.cc
index 2ca4a85..768983b 100644
--- a/bse/bseenginemaster.cc
+++ b/bse/bseenginemaster.cc
@@ -908,8 +908,8 @@ engine_start_slaves ()
 {
   assert_return (slaves_running == false);
   slaves_running = true;
-  const uint n_cpus = 4; // FIXME: processors online?
-  const uint n_slaves = n_cpus - 1;
+  const uint n_cpus = Rapicorn::ThisThread::online_cpus();
+  const uint n_slaves = std::max (1u, n_cpus) - 1;
   for (uint i = 0; i < n_slaves; i++)
     slave_threads.push_back (new std::thread (engine_run_slave));
 }