1b593e1ea4
git-subtree-dir: third_party/git git-subtree-split: cb715685942260375e1eb8153b0768a376e4ece7
125 lines
2.6 KiB
C
125 lines
2.6 KiB
C
#include "cache.h"
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#include "thread-utils.h"
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#if defined(hpux) || defined(__hpux) || defined(_hpux)
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# include <sys/pstat.h>
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#endif
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/*
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* By doing this in two steps we can at least get
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* the function to be somewhat coherent, even
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* with this disgusting nest of #ifdefs.
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*/
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#ifndef _SC_NPROCESSORS_ONLN
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# ifdef _SC_NPROC_ONLN
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# define _SC_NPROCESSORS_ONLN _SC_NPROC_ONLN
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# elif defined _SC_CRAY_NCPU
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# define _SC_NPROCESSORS_ONLN _SC_CRAY_NCPU
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# endif
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#endif
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int online_cpus(void)
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{
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#ifdef NO_PTHREADS
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return 1;
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#else
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#ifdef _SC_NPROCESSORS_ONLN
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long ncpus;
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#endif
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#ifdef GIT_WINDOWS_NATIVE
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SYSTEM_INFO info;
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GetSystemInfo(&info);
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if ((int)info.dwNumberOfProcessors > 0)
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return (int)info.dwNumberOfProcessors;
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#elif defined(hpux) || defined(__hpux) || defined(_hpux)
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struct pst_dynamic psd;
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if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
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return (int)psd.psd_proc_cnt;
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#elif defined(HAVE_BSD_SYSCTL) && defined(HW_NCPU)
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int mib[2];
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size_t len;
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int cpucount;
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mib[0] = CTL_HW;
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# ifdef HW_AVAILCPU
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mib[1] = HW_AVAILCPU;
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len = sizeof(cpucount);
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if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
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return cpucount;
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# endif /* HW_AVAILCPU */
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mib[1] = HW_NCPU;
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len = sizeof(cpucount);
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if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
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return cpucount;
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#endif /* defined(HAVE_BSD_SYSCTL) && defined(HW_NCPU) */
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#ifdef _SC_NPROCESSORS_ONLN
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if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
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return (int)ncpus;
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#endif
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return 1;
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#endif
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}
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int init_recursive_mutex(pthread_mutex_t *m)
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{
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#ifndef NO_PTHREADS
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pthread_mutexattr_t a;
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int ret;
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ret = pthread_mutexattr_init(&a);
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if (!ret) {
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ret = pthread_mutexattr_settype(&a, PTHREAD_MUTEX_RECURSIVE);
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if (!ret)
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ret = pthread_mutex_init(m, &a);
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pthread_mutexattr_destroy(&a);
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}
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return ret;
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#else
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return 0;
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#endif
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}
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#ifdef NO_PTHREADS
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int dummy_pthread_create(pthread_t *pthread, const void *attr,
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void *(*fn)(void *), void *data)
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{
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/*
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* Do nothing.
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*
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* The main purpose of this function is to break compiler's
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* flow analysis and avoid -Wunused-variable false warnings.
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*/
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return ENOSYS;
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}
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int dummy_pthread_init(void *data)
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{
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/*
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* Do nothing.
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*
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* The main purpose of this function is to break compiler's
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* flow analysis or it may realize that functions like
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* pthread_mutex_init() is no-op, which means the (static)
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* variable is not used/initialized at all and trigger
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* -Wunused-variable
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*/
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return ENOSYS;
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}
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int dummy_pthread_join(pthread_t pthread, void **retval)
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{
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/*
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* Do nothing.
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*
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* The main purpose of this function is to break compiler's
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* flow analysis and avoid -Wunused-variable false warnings.
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*/
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return ENOSYS;
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}
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#endif
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