File : thread-utils.c - Ohloh Code Search

Project: Git

Code Location: git://github.com/git/git.gitmaster

Outline

> Fn int online_cpus(void)
- V long ncpus
- V SYSTEM_INFO info
- V pst_dynamic psd

> Fn int init_recursive_mutex(pthread_mutex_t*)
- V pthread_mutexattr_t a
- V int ret

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thread-utils.c

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#include "cache.h"
#include "thread-utils.h"

#if defined(hpux) || defined(__hpux) || defined(_hpux)
#  include <sys/pstat.h>
#endif

/*
 * By doing this in two steps we can at least get
 * the function to be somewhat coherent, even
 * with this disgusting nest of #ifdefs.
 */
#ifndef _SC_NPROCESSORS_ONLN
#  ifdef _SC_NPROC_ONLN
#    define _SC_NPROCESSORS_ONLN _SC_NPROC_ONLN
#  elif defined _SC_CRAY_NCPU
#    define _SC_NPROCESSORS_ONLN _SC_CRAY_NCPU
#  endif
#endif

int online_cpus(void)
{
#ifdef _SC_NPROCESSORS_ONLN
	long ncpus;
#endif

#ifdef _WIN32
	SYSTEM_INFO info;
	GetSystemInfo(&info);

	if ((int)info.dwNumberOfProcessors > 0)
		return (int)info.dwNumberOfProcessors;
#elif defined(hpux) || defined(__hpux) || defined(_hpux)
	struct pst_dynamic psd;

	if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
		return (int)psd.psd_proc_cnt;
#endif

#ifdef _SC_NPROCESSORS_ONLN
	if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)
		return (int)ncpus;
#endif

	return 1;
}

int init_recursive_mutex(pthread_mutex_t *m)
{
	pthread_mutexattr_t a;
	int ret;

	ret = pthread_mutexattr_init(&a);
	if (!ret) {
		ret = pthread_mutexattr_settype(&a, PTHREAD_MUTEX_RECURSIVE);
		if (!ret)
			ret = pthread_mutex_init(m, &a);
		pthread_mutexattr_destroy(&a);
	}
	return ret;
}