Merge commit '86cc97e55fe346502462284d2e636a2b3708163e' as 'Sources/OpenVPN3'

Sources/OpenVPN3/openvpn/linux/core.hpp

@@ -0,0 +1,64 @@
+//    OpenVPN -- An application to securely tunnel IP networks
+//               over a single port, with support for SSL/TLS-based
+//               session authentication and key exchange,
+//               packet encryption, packet authentication, and
+//               packet compression.
+//
+//    Copyright (C) 2012-2017 OpenVPN Inc.
+//
+//    This program is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Affero General Public License Version 3
+//    as published by the Free Software Foundation.
+//
+//    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 Affero General Public License for more details.
+//
+//    You should have received a copy of the GNU Affero General Public License
+//    along with this program in the COPYING file.
+//    If not, see <http://www.gnu.org/licenses/>.
+
+// Linux method for binding a thread to a particular core.
+
+#ifndef OPENVPN_LINUX_CORE_H
+#define OPENVPN_LINUX_CORE_H
+
+#include <pthread.h>
+
+#include <openvpn/common/core.hpp>
+
+namespace openvpn {
+
+  inline int bind_to_core(const int core_id)
+  {
+    const int num_cores = n_cores();
+    if (core_id >= num_cores)
+      return EINVAL;
+
+    cpu_set_t cpuset;
+    CPU_ZERO(&cpuset);
+    CPU_SET(core_id, &cpuset);
+
+    pthread_t current_thread = pthread_self();
+    return pthread_setaffinity_np(current_thread, sizeof(cpu_set_t), &cpuset);
+  }
+
+  inline int exclude_from_core(const int core_id)
+  {
+    const int num_cores = n_cores();
+    if (num_cores <= 1 || core_id >= num_cores)
+      return EINVAL;
+
+    cpu_set_t cpuset;
+    CPU_ZERO(&cpuset);
+    for (int i = 0; i < num_cores; ++i)
+      if (i != core_id)
+	CPU_SET(i, &cpuset);
+
+    pthread_t current_thread = pthread_self();
+    return pthread_setaffinity_np(current_thread, sizeof(cpu_set_t), &cpuset);
+  }
+}
+
+#endif