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//
// MIT License
// Copyright (c) 2020 Jonathan R. Madsen
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED
// "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
// LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
// HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
// ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
//
// ---------------------------------------------------------------
// Tasking class implementation
//
// Threading.cc
//
#include "PTL/Threading.hh"
#include "PTL/AutoLock.hh"
#include "PTL/Globals.hh"
#include "PTL/Types.hh"
#if defined(PTL_WINDOWS)
# include <Windows.h>
#elif defined(PTL_UNIX)
# include <sys/syscall.h>
# include <sys/types.h>
# include <unistd.h>
#endif
#if defined(PTL_LINUX)
# include <fstream>
#endif
#include <atomic>
using namespace PTL;
//======================================================================================//
namespace
{
thread_local int ThreadID = Threading::MASTER_ID;
} // namespace
//======================================================================================//
Pid_t
Threading::GetPidId()
{
// In multithreaded mode return Thread ID
return std::this_thread::get_id();
}
//======================================================================================//
unsigned
Threading::GetNumberOfCores()
{
return std::thread::hardware_concurrency();
}
//======================================================================================//
unsigned
Threading::GetNumberOfPhysicalCpus()
{
#if defined(PTL_MACOS)
int count;
size_t count_len = sizeof(count);
sysctlbyname("hw.physicalcpu", &count, &count_len, nullptr, 0);
return static_cast<unsigned>(count);
#elif defined(PTL_LINUX)
unsigned core_id_count = 0;
std::ifstream ifs("/proc/cpuinfo");
if(ifs)
{
std::set<std::string> core_ids;
while(true)
{
std::string line = {};
getline(ifs, line);
if(!ifs.good())
break;
if(line.find("core id") != std::string::npos)
{
for(std::string&& itr : { "core id", ":", " ", "\t" })
{
static auto _npos = std::string::npos;
auto _pos = _npos;
while((_pos = line.find(itr)) != _npos)
line = line.replace(_pos, itr.length(), "");
}
core_ids.insert(line);
}
}
core_id_count = static_cast<unsigned>(core_ids.size());
if(core_id_count > 0)
return core_id_count;
}
return GetNumberOfCores();
#else
return GetNumberOfCores();
#endif
}
//======================================================================================//
void
Threading::SetThreadId(int value)
{
ThreadID = value;
}
int
Threading::GetThreadId()
{
return ThreadID;
}
//======================================================================================//
bool
Threading::SetPinAffinity(int _cpu)
{
#if defined(__linux__) || defined(_AIX)
cpu_set_t _cpu_set{};
CPU_ZERO(&_cpu_set);
if(_cpu >= 0)
CPU_SET(_cpu, &_cpu_set);
return (pthread_setaffinity_np(pthread_self(), sizeof(cpu_set_t), &_cpu_set) == 0);
#else // Not available for Mac, WIN,...
ConsumeParameters(_cpu);
return true;
#endif
}
//======================================================================================//
bool
Threading::SetThreadPriority(int _prio)
{
#if defined(__linux__) || defined(_AIX)
return (pthread_setschedprio(pthread_self(), _prio) == 0);
#else // Not available for Mac, WIN,...
ConsumeParameters(_prio);
return true;
#endif
}
//======================================================================================//
bool
Threading::SetPinAffinity(int _cpu, NativeThread& _t)
{
#if defined(__linux__) || defined(_AIX)
cpu_set_t _cpu_set{};
CPU_ZERO(&_cpu_set);
CPU_SET(_cpu, &_cpu_set);
return (pthread_setaffinity_np(static_cast<pthread_t>(_t), sizeof(cpu_set_t),
&_cpu_set) == 0);
#else // Not available for Mac, WIN,...
ConsumeParameters(_cpu, _t);
return true;
#endif
}
//======================================================================================//
bool
Threading::SetThreadPriority(int _prio, NativeThread& _t)
{
#if defined(__linux__) || defined(_AIX)
return (pthread_setschedprio(static_cast<pthread_t>(_t), _prio) == 0);
#else
ConsumeParameters(_prio, _t);
return true;
#endif
}
//======================================================================================//
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