mirror of
https://github.com/OpenVPN/openvpn3.git
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ba264862a5
Also let the function ncores function use the more standard C++ implementation and only fall back to our custom implementation if it does not work.
71 lines
2.1 KiB
C++
71 lines
2.1 KiB
C++
// OpenVPN -- An application to securely tunnel IP networks
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// over a single port, with support for SSL/TLS-based
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// session authentication and key exchange,
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// packet encryption, packet authentication, and
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// packet compression.
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//
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// Copyright (C) 2012-2017 OpenVPN Inc.
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License Version 3
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// as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program in the COPYING file.
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// If not, see <http://www.gnu.org/licenses/>.
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// Linux methods for enumerating the number of cores on machine,
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// and binding a thread to a particular core.
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#ifndef OPENVPN_COMMON_CORE_H
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#define OPENVPN_COMMON_CORE_H
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#include <openvpn/common/platform.hpp>
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#if defined(OPENVPN_PLATFORM_TYPE_APPLE)
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#include <sys/types.h>
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#include <sys/sysctl.h>
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#elif defined(OPENVPN_PLATFORM_LINUX)
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#include <unistd.h>
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#elif defined(OPENVPN_PLATFORM_WIN)
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#include <windows.h>
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#endif
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namespace openvpn {
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inline int n_cores()
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{
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int count = std::thread::hardware_concurrency();
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// C++11 allows thread::hardware_concurrency() to return 0, fall back
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// to specific solution if we detect this
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if (count > 0)
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return count;
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#if defined(OPENVPN_PLATFORM_TYPE_APPLE)
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size_t count_len = sizeof(count);
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if (::sysctlbyname("hw.logicalcpu", &count, &count_len, NULL, 0) != 0)
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count = 1;
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return count;
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#elif defined(OPENVPN_PLATFORM_LINUX)
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long ret = ::sysconf(_SC_NPROCESSORS_ONLN);
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if (ret <= 0)
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ret = 1;
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return ret;
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#elif defined(OPENVPN_PLATFORM_WIN)
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SYSTEM_INFO si;
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::GetSystemInfo(&si);
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return si.dwNumberOfProcessors;
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#else
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#error no implementation for n_cores()
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#endif
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}
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}
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#endif
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