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// -*- C++ -*-
/*
Heap Layers: An Extensible Memory Allocation Infrastructure
Copyright (C) 2000-2003 by Emery Berger
http://www.cs.umass.edu/~emery
emery@cs.umass.edu
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef HL_CPUINFO_H
#define HL_CPUINFO_H
#if defined(_WIN32)
#include <windows.h>
#include <process.h>
#else
#include <unistd.h>
#endif
#if !defined(_WIN32)
#include <pthread.h>
#endif
#if defined(__SVR4) // Solaris
#include <sys/lwp.h>
extern "C" unsigned int lwp_self(void);
#include <thread.h>
extern "C" int _thr_self(void);
#endif
#if defined(__linux)
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#endif
#if defined(__APPLE__)
#include <sys/types.h>
#include <sys/sysctl.h>
#endif
#if defined(__sgi)
#include <sys/types.h>
#include <sys/sysmp.h>
#include <sys/sysinfo.h>
#endif
#if defined(hpux)
#include <sys/mpctl.h>
#endif
#if defined(_WIN32)
extern __declspec(thread) int localThreadId;
#endif
#if defined(__SVR4) && defined(MAP_ALIGN)
extern volatile int anyThreadStackCreated;
#endif
namespace HL {
/**
* @class CPUInfo
* @author Emery Berger <http://www.cs.umass.edu/~emery>
*
* @brief Architecture-independent wrapper to get number of CPUs.
*/
class CPUInfo {
public:
CPUInfo (void)
{}
inline static int getNumProcessors (void) {
static int _numProcessors = computeNumProcessors();
return _numProcessors;
}
static inline unsigned long getThreadId (void);
inline static int computeNumProcessors (void);
};
int CPUInfo::computeNumProcessors (void)
{
static int np = 0;
if (!np) {
#if defined(__linux) || defined(__APPLE__)
np = (int) sysconf(_SC_NPROCESSORS_ONLN);
#elif defined(_WIN32)
SYSTEM_INFO infoReturn[1];
GetSystemInfo (infoReturn);
np = (int) (infoReturn->dwNumberOfProcessors);
#elif defined(__sgi)
np = (int) sysmp(MP_NAPROCS);
#elif defined(hpux)
np = mpctl(MPC_GETNUMSPUS, NULL, NULL); // or pthread_num_processors_np()?
#elif defined(_SC_NPROCESSORS_ONLN)
np = (int) (sysconf(_SC_NPROCESSORS_ONLN));
#else
np = 2;
// Unsupported platform.
// Pretend we have at least two processors. This approach avoids the risk of assuming
// we're on a uniprocessor, which might lead clever allocators to avoid using atomic
// operations for all locks.
#endif
return np;
} else {
return np;
}
}
// Note: when stacksize arg is NULL for pthread_attr_setstacksize [Solaris],
// stack size is 1 MB for 32-bit arch, 2 MB for 64-bit arch.
// pthread_attr_getstacksize
// pthread_attr_setstackaddr
// pthread_attr_getstackaddr
// PTHREAD_STACK_SIZE is minimum.
// or should we just assume we have __declspec(thread) or __thread?
#if defined(USE_THREAD_KEYWORD)
extern __thread int localThreadId;
#endif
// FIX ME FIXME
//#include <stdio.h>
unsigned long CPUInfo::getThreadId (void) {
#if defined(__SVR4)
size_t THREAD_STACK_SIZE;
if (sizeof(size_t) <= 4) {
THREAD_STACK_SIZE = 1048576;
} else {
// 64-bits.
THREAD_STACK_SIZE = 1048576 * 2;
}
if (0) { // !anyThreadStackCreated) {
// We know a priori that all stack variables
// are on different stacks. Since no one has created
// a special one, we are in control, and thus all stacks
// are 1 MB in size and on 1 MB boundaries.
// (Actually: 1 MB for 32-bits, 2 MB for 64-bits.)
char buf;
return (((size_t) &buf) & ~(THREAD_STACK_SIZE-1)) >> 20;
} else {
return (int) pthread_self();
}
#elif defined(_WIN32)
// It looks like thread id's are always multiples of 4, so...
return GetCurrentThreadId() >> 2;
#elif defined(__APPLE__)
// Consecutive thread id's in Mac OS are 4096 apart;
// dividing off the 4096 gives us an appropriate thread id.
int tid = (int) ((unsigned long) pthread_self()) >> 12;
return tid;
#elif defined(__BEOS__)
return find_thread(0);
#elif defined(USE_THREAD_KEYWORD)
return localThreadId;
#elif defined(__linux) || defined(PTHREAD_KEYS_MAX)
// Consecutive thread id's in Linux are 1024 apart;
// dividing off the 1024 gives us an appropriate thread id.
return (unsigned long) pthread_self() >> 10;
#elif defined(POSIX)
return (unsigned long) pthread_self();
#elif USE_SPROC
// This hairiness has the same effect as calling getpid(),
// but it's MUCH faster since it avoids making a system call
// and just accesses the sproc-local data directly.
unsigned long pid = (unsigned long) PRDA->sys_prda.prda_sys.t_pid;
return pid;
#else
return 0;
#endif
}
}
#endif
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