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// 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- OpenVPN Inc.
//
// SPDX-License-Identifier: MPL-2.0 OR AGPL-3.0-only WITH openvpn3-openssl-exception
//
// 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);
}
} // namespace openvpn
#endif
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