В Qt нашел решение.
$QTDIR/src/corelib/thread/qthread_unix.cpp
| Код |
int QThread::idealThreadCount()
{
int cores = -1;
#if defined(Q_OS_MAC)
// Mac OS X
cores = MPProcessorsScheduled();
#elif defined(Q_OS_HPUX)
// HP-UX
struct pst_dynamic psd;
if (pstat_getdynamic(&psd, sizeof(psd), 1, 0) == -1) {
perror("pstat_getdynamic");
cores = -1;
} else {
cores = (int)psd.psd_proc_cnt;
}
#elif defined(Q_OS_BSD4)
// FreeBSD, OpenBSD, NetBSD, BSD/OS
size_t len = sizeof(cores);
int mib[2];
mib[0] = CTL_HW;
mib[1] = HW_NCPU;
if (sysctl(mib, 2, &cores, &len, NULL, 0) != 0) {
perror("sysctl");
cores = -1;
}
#elif defined(Q_OS_IRIX)
// IRIX
cores = (int)sysconf(_SC_NPROC_ONLN);
#elif defined(Q_OS_INTEGRITY)
// as of aug 2008 Integrity only supports one single core CPU
cores = 1;
#elif defined(Q_OS_SYMBIAN)
// ### TODO - Get the number of cores from HAL? when multicore architectures (SMP) are supported
cores = 1;
#elif defined(Q_OS_VXWORKS)
// VxWorks
# if defined(QT_VXWORKS_HAS_CPUSET)
cpuset_t cpus = vxCpuEnabledGet();
cores = 0;
// 128 cores should be enough for everyone ;)
for (int i = 0; i < 128 && !CPUSET_ISZERO(cpus); ++i) {
if (CPUSET_ISSET(cpus, i)) {
CPUSET_CLR(cpus, i);
cores++;
}
}
# else
// as of aug 2008 VxWorks < 6.6 only supports one single core CPU
cores = 1;
# endif
#else
// the rest: Linux, Solaris, AIX, Tru64
cores = (int)sysconf(_SC_NPROCESSORS_ONLN);
#endif
return cores;
}
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