G4Threading.cc

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//
// $Id:$
//
// --------------------------------------------------------------
//      GEANT 4 class implementation file
//
// G4Threading.cc
//
// ---------------------------------------------------------------
// Author: Andrea Dotti (15 Feb 2013): First Implementation
// ---------------------------------------------------------------

#include "G4Threading.hh"
#include "G4AutoDelete.hh"
#include "G4AutoLock.hh"
#include "globals.hh"

#if defined (WIN32)
   #include <Windows.h>
#else
   #include <unistd.h>
   #include <sys/types.h>
   #include <sys/syscall.h>
#endif

#if defined(G4MULTITHREADED)

#include <atomic>

namespace
{
   G4ThreadLocal G4int G4ThreadID = G4Threading::MASTER_ID;
   G4bool isMTAppType = false;
}

G4Pid_t G4Threading::G4GetPidId()
{
    // In multithreaded mode return Thread ID
    return std::this_thread::get_id();
}

G4int G4Threading::G4GetNumberOfCores()
{
    return std::thread::hardware_concurrency();
}

void G4Threading::G4SetThreadId(G4int value ) { G4ThreadID = value; }
G4int G4Threading::G4GetThreadId() { return G4ThreadID; }
G4bool G4Threading::IsWorkerThread() { return (G4ThreadID>=0); }
G4bool G4Threading::IsMasterThread() { return (G4ThreadID==MASTER_ID); }

#if defined(__linux__) || defined(_AIX)
G4bool G4Threading::G4SetPinAffinity(G4int cpu, G4NativeThread& aT)
{
    cpu_set_t* aset = new cpu_set_t;
    G4AutoDelete::Register(aset);
    CPU_ZERO(aset);
    CPU_SET(cpu, aset);
    pthread_t& _aT = (pthread_t&) (aT);
    return (pthread_setaffinity_np(_aT, sizeof(cpu_set_t), aset) == 0);
}
#else //Not available for Mac, WIN,...
G4bool G4Threading::G4SetPinAffinity(G4int, G4NativeThread&)
{
    G4Exception("G4Threading::G4SetPinAffinity()",
                "NotImplemented", JustWarning,
                "Affinity setting not available for this architecture, "
                "ignoring...");
    return true;
}
#endif

void G4Threading::SetMultithreadedApplication(G4bool value)
{
    isMTAppType = value;
}

G4bool G4Threading::IsMultithreadedApplication()
{
    return isMTAppType;
}

namespace
{
    std::atomic_int numActThreads(0);
}
int G4Threading::WorkerThreadLeavesPool() { return numActThreads--; }
int G4Threading::WorkerThreadJoinsPool() { return numActThreads++;}
G4int G4Threading::GetNumberOfRunningWorkerThreads() { return numActThreads.load(); }

#else  // Sequential mode

G4Pid_t G4Threading::G4GetPidId()
{
    // In sequential mode return Process ID and not Thread ID
#if defined(WIN32)
    return GetCurrentProcessId();
#else
    return getpid();
#endif
}

G4int G4Threading::G4GetNumberOfCores() { return 1; }
G4int G4Threading::G4GetThreadId() { return G4Threading::SEQUENTIAL_ID; }
G4bool G4Threading::IsWorkerThread() { return false; }
G4bool G4Threading::IsMasterThread() { return true; }
void G4Threading::G4SetThreadId(G4int) {}

G4bool G4Threading::G4SetPinAffinity(G4int, G4NativeThread&) { return true; }

void G4Threading::SetMultithreadedApplication(G4bool) {}
G4bool G4Threading::IsMultithreadedApplication() { return false; }
int G4Threading::WorkerThreadLeavesPool() { return 0; }
int G4Threading::WorkerThreadJoinsPool() { return 0; }
G4int G4Threading::GetNumberOfRunningWorkerThreads() { return 0; }

#endif