Messages in this thread | | | Date | Thu, 19 May 2005 22:30:32 +0000 | From | "J.A. Magallon" <> | Subject | Re: Illegal use of reserved word in system.h |
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On 05.20, Andreas Schwab wrote: > Ben Greear <greearb@candelatech.com> writes: > > > Chris Friesen wrote: > >> Ben Greear wrote: > >> > >>> It can be helpful to know what HZ you are running at, for instance if > >>> you care > >>> very much about the (average) precision of a select/poll timeout. > >> If you move the binary to a different system (or upgrade the kernel, for > >> that matter) the assumptions can be totally wrong. > >> This should be checked at runtime, not compile time. > > > > If course...that is why I like the idea of some system call or standard API > > to get the information. > > sysconf(3) >
Yup, I do it to start a thread per core. Stupid and portable C++ code follows:
//! Node Information __class Node { private: static void init(); public: //! Node name static char name[MAXNAMLEN]; //! Node model name static char model[MAXNAMLEN]; //! Node hardware architecture static char arch[MAXNAMLEN]; //! Node Operating Node name static char osname[MAXNAMLEN]; //! Node Operating Node release static char osrel[MAXNAMLEN]; //! Node memory static int ram; //! Node number of available processors static int nproc; };
#ifdef __UNX__
# include <unistd.h>
# ifdef sgi # include <sys/systeminfo.h> # include <invent.h> # endif
# ifdef __linux__ # include <sys/sysinfo.h> # endif
# ifdef sun # include <sys/systeminfo.h> # endif
# ifdef __hpux extern "C" { # include <sys/mpctl.h> } # endif
#endif
int Node::inited = 0; char Node::name[MAXNAMLEN]; char Node::model[MAXNAMLEN]; char Node::arch[MAXNAMLEN]; char Node::osname[MAXNAMLEN]; char Node::osrel[MAXNAMLEN]; int Node::ram; int Node::nproc;
void Node::init() { if (inited) return;
nproc = 1; ram = 0;
#if defined(__UNX__) struct utsname sys; uname(&sys); strcpy(name,sys.nodename); strcpy(model,sys.machine); strcpy(osname,sys.sysname); strcpy(osrel,sys.release); # ifdef sgi sysinfo(SI_ARCHITECTURE,arch,MAXNAMLEN); nproc = sysconf(_SC_NPROC_ONLN); inventory_t* ip; while (ip=getinvent()) { if ((ip->inv_class==INV_MEMORY) && (ip->inv_type==INV_MAIN)) ram = ip->inv_state; } endinvent(); # endif # ifdef sun sysinfo(SI_ARCHITECTURE,arch,MAXNAMLEN); nproc = sysconf(_SC_NPROCESSORS_ONLN); ram = sysconf(_SC_PAGESIZE)*sysconf(_SC_PHYS_PAGES); # endif # ifdef __linux__ strcpy(arch,"x86"); nproc = sysconf(_SC_NPROCESSORS_ONLN); if (!nproc) nproc = 1; ram = sysconf(_SC_PAGESIZE)*sysconf(_SC_PHYS_PAGES); # endif # ifdef __hpux strcpy(arch,"PA-RISC"); nproc = mpctl(MPC_GETNUMSPUS,0,0); ram = 0; // TODO... # endif
#elif defined(__WIN__) DWORD len=MAXNAMLEN; GetComputerNameA(name,&len); strcpy(model,"Intel"); SYSTEM_INFO sys; GetSystemInfo(&sys); nproc = sys.dwNumberOfProcessors; sprintf(arch,"i%d86",sys.wProcessorLevel); MEMORYSTATUS minfo; GlobalMemoryStatus(&minfo); ram = minfo.dwTotalPhys; OSVERSIONINFO osver; osver.dwOSVersionInfoSize = sizeof(OSVERSIONINFO); GetVersionEx(&osver); int relmaj = osver.dwMajorVersion; int relmin = osver.dwMinorVersion; switch(osver.dwPlatformId) { case VER_PLATFORM_WIN32s: strcpy(osname,"Win3.1"); break; case VER_PLATFORM_WIN32_WINDOWS: sprintf(osname,"Win9%c",(relmin>0 ? '8' : '5')); break; case VER_PLATFORM_WIN32_NT: strcpy(osname,"WinNT"); break; default: strcpy(osname,"Win??"); }
sprintf(osrel,"%d.%d (build %d) %s", relmaj,relmin,osver.dwBuildNumber,osver.szCSDVersion);
#else
strcpy(name,"Unknown"); strcpy(model,"Unknown"); strcpy(arch,"Unknown"); strcpy(osname,"Unknown"); strcpy(osrel,"?.?");
#endif
inited = 1;
info(); }
-- J.A. Magallon <jamagallon()able!es> \ Software is like sex: werewolf!able!es \ It's better when it's free Mandriva Linux release 2006.0 (Cooker) for i586 Linux 2.6.11-jam19 (gcc 4.0.0 (4.0.0-3mdk for Mandriva Linux release 2006.0))
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