mirror of
https://github.com/git/git
synced 2024-10-30 04:01:21 +00:00
9374919442
The mutex used to protect object access (read_mutex) may need to be
acquired recursively. Introduce init_recursive_mutex() helper function
in thread-utils.c that constructs a mutex with the PHREAD_MUTEX_RECURSIVE
attribute.
pthread_mutex_init() emulation on Win32 is already recursive as it is
implemented on top of the CRITICAL_SECTION type, which is recursive.
http://msdn.microsoft.com/en-us/library/ms682530%28VS.85%29.aspx
Add do-nothing compatibility wrappers for pthread_mutexattr* functions.
Initial-version-by: Fredrik Kuivinen <frekui@gmail.com>
Signed-off-by: Johannes Sixt <j6t@kdbg.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#include "cache.h"
|
|
#include <pthread.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;
|
|
}
|