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/* Copyright 2019 Rene Rivera
* Distributed under the Boost Software License, Version 1.0.
* (See accompanying file LICENSE.txt or https://www.bfgroup.xyz/b2/LICENSE.txt)
*/
#include "sysinfo.h"
#include "jam.h"
#include "output.h"
#include <thread>
#if defined(OS_MACOSX)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#if !defined(OS_NT)
#include <unistd.h>
#else
#include <windows.h>
#endif
#if defined(OS_LINUX) || defined(__GLIBC__)
// Need to define this in case it's not as that's the only way to get the
// sched_* APIs.
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#include <sched.h>
#endif
b2::system_info::system_info()
{
}
namespace
{
unsigned int macosx_physicalcpu()
{
#if defined(OS_MACOSX)
int out_hw_ncpu = 0;
size_t len_hw_ncpu = sizeof(out_hw_ncpu);
int result = ::sysctlbyname(
"hw.physicalcpu", &out_hw_ncpu, &len_hw_ncpu, nullptr, 0);
if (result == 0) return out_hw_ncpu;
#endif
return 0;
}
unsigned int macosx_logicalcpu()
{
#if defined(OS_MACOSX)
int out_hw_ncpu = 0;
size_t len_hw_ncpu = sizeof(out_hw_ncpu);
int result = ::sysctlbyname(
"hw.logicalcpu", &out_hw_ncpu, &len_hw_ncpu, nullptr, 0);
if (result == 0) return out_hw_ncpu;
#endif
return 0;
}
unsigned int sched_affinity_cpu_count()
{
#if defined(CPU_COUNT_S)
::cpu_set_t cpu_set;
if (::sched_getaffinity(0, sizeof(cpu_set_t), &cpu_set) == 0)
{
return CPU_COUNT_S(sizeof(cpu_set_t), &cpu_set);
}
#endif
return 0;
}
unsigned int sysconf_nprocs_configured()
{
#if defined(_SC_NPROCESSORS_ONLN)
return ::sysconf(_SC_NPROCESSORS_CONF);
#else
return 0;
#endif
}
unsigned int sysconf_nprocs_online()
{
#if defined(_SC_NPROCESSORS_ONLN)
return ::sysconf(_SC_NPROCESSORS_ONLN);
#else
return 0;
#endif
}
unsigned int std_thread_hardware_concurrency()
{
// [2020-08-19] Mingw-w64 (e.g. i686-w64-mingw-32-g++ from Cygwin,
// g++-mingw-w64-i686-win32) does not have std::thread etc. But we
// should still allow building the engine with this (important) toolset:
// - It is free, lightweight, standards-conforming.
// - It might be the only C++11 toolset for Windows XP.
// (Please see http://www.crouchingtigerhiddenfruitbat.org/Cygwin/timemachine.html !)
// - It is powerful enough even without std::thread etc. For example, it
// can build-and-use Boost.Thread.
// - The only thing currently used from std::thread is this call to
// hardware_concurrency !
#if ! defined (_WIN32)
return std::thread::hardware_concurrency();
#else
return 0;
#endif
}
unsigned int win32_logicalcpu()
{
#if defined (_WIN32)
SYSTEM_INFO si;
GetSystemInfo (&si);
return si.dwNumberOfProcessors;
#else
return 0;
#endif
}
}
unsigned int b2::system_info::cpu_core_count()
{
if (cpu_core_count_ == 0)
{
cpu_thread_count_ = macosx_physicalcpu();
}
if (cpu_thread_count_ == 0)
{
cpu_thread_count_ = sysconf_nprocs_configured();
}
if (cpu_core_count_ <= 0)
{
cpu_core_count_ = 1;
}
return cpu_core_count_;
}
unsigned int b2::system_info::cpu_thread_count()
{
if (cpu_thread_count_ == 0)
{
cpu_thread_count_ = macosx_logicalcpu();
}
if (cpu_thread_count_ == 0)
{
cpu_thread_count_ = sched_affinity_cpu_count();
}
if (cpu_thread_count_ == 0)
{
cpu_thread_count_ = sysconf_nprocs_online();
}
if (cpu_thread_count_ == 0)
{
cpu_thread_count_ = std_thread_hardware_concurrency();
}
if (cpu_thread_count_ == 0)
{
cpu_thread_count_ = win32_logicalcpu();
}
if (cpu_thread_count_ == 0)
{
cpu_thread_count_ = cpu_core_count();
}
return cpu_thread_count_;
}
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