OSystem for rtstella

src/common/MediaFactory.hxx

@@ -31,6 +31,8 @@
   #if defined(RETRON77)
     #include "SettingsR77.hxx"
     #include "OSystemR77.hxx"
+  #elif defined(RTSTELLA)
+    #include "OSystemRTStella.hxx"
   #else
     #include "OSystemUNIX.hxx"
   #endif
@@ -92,6 +94,8 @@ class MediaFactory
     #if defined(BSPF_UNIX)
       #if defined(RETRON77)
         return make_unique<OSystemR77>();
+      #elif defined(RTSTELLA)
+        return make_unique<OSystemRTStella>();
       #else
         return make_unique<OSystemUNIX>();
       #endif

src/os/rtstella/OSystemRTStella.cxx

@@ -0,0 +1,36 @@
+#include "OSystemRTStella.hxx"
+
+#include <sstream>
+#include <sched.h>
+#include <sys/sysinfo.h>
+
+#include "Logger.hxx"
+
+namespace {
+  void configureScheduler() {
+    const int cores = get_nprocs();
+    if (cores < 2) {
+      Logger::error("failed to set scheduling affinity on main thread - not enough cores");
+      return;
+    }
+
+    cpu_set_t cpuset;
+    CPU_ZERO(&cpuset);
+    for (int i = 0; i < cores - 1; i++) CPU_SET(i, &cpuset);
+
+    if (sched_setaffinity(0, sizeof(cpuset), &cpuset) < 0){
+      ostringstream ss;
+      ss << "failed to pin main and auxiliary thread: " << errno;
+
+      Logger::error(ss.str());
+    }
+  }
+}
+
+// - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
+bool OSystemRTStella::initialize(const Settings::Options& options)
+{
+  configureScheduler();
+
+  return OSystemStandalone::initialize(options);
+}

src/os/rtstella/OSystemRTStella.hxx

@@ -0,0 +1,28 @@
+//============================================================================
+//
+//   SSSS    tt          lll  lll
+//  SS  SS   tt           ll   ll
+//  SS     tttttt  eeee   ll   ll   aaaa
+//   SSSS    tt   ee  ee  ll   ll      aa
+//      SS   tt   eeeeee  ll   ll   aaaaa  --  "An Atari 2600 VCS Emulator"
+//  SS  SS   tt   ee      ll   ll  aa  aa
+//   SSSS     ttt  eeeee llll llll  aaaaa
+//
+// Copyright (c) 1995-2023 by Bradford W. Mott, Stephen Anthony
+// and the Stella Team
+//
+// See the file "License.txt" for information on usage and redistribution of
+// this file, and for a DISCLAIMER OF ALL WARRANTIES.
+//============================================================================
+
+#ifndef OSYSTEM_RTSTELLA_HXX
+#define OSYSTEM_RTSTELLA_HXX
+
+#include "OSystemStandalone.hxx"
+
+class OSystemRTStella: public OSystemStandalone {
+  public:
+    bool initialize(const Settings::Options& options) override;
+};
+
+#endif // OSYSTEM_RTSTELLA_HXX

src/os/rtstella/RTEmulationWorker.cxx

@@ -34,7 +34,7 @@ namespace {
 
     const int cores = get_nprocs();
     if (cores < 2) {
-      Logger::error("failed to set scheduling affinity - not enough cores");
+      Logger::error("failed to set scheduling affinity on emulation worker - not enough cores");
       return;
     }
 
@@ -44,7 +44,7 @@ namespace {
 
     if (sched_setaffinity(0, sizeof(cpuset), &cpuset) < 0){
       ostringstream ss;
-      ss << "failed to pin thread: " << errno;
+      ss << "failed to pin worker thread: " << errno;
 
       Logger::error(ss.str());
     }

src/os/rtstella/module.mk

@@ -1,7 +1,9 @@
 MODULE := src/os/rtstella
 
 MODULE_OBJS := \
-	src/os/rtstella/Spinlock.o src/os/rtstella/RTEmulationWorker.o
+	src/os/rtstella/Spinlock.o \
+	src/os/rtstella/RTEmulationWorker.o \
+	src/os/rtstella/OSystemRTStella.o
 
 MODULE_DIRS += \
 	src/os/rtstella