thodg/libgit2/src/thread-utils.c

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• Hash : 36f0f61f
  Author :
  Date : 2008-11-18T19:06:25
  

  Add compiler/platform agnostic thread-local storage It doesn't cover all cases, but we can work on those as we go along. For now, gcc, MSVC++, Intel C/C++, IBM XL C/C++, Sun Studio C/C++ and Borland C++ Builder are the supported compilers (although we boldly assume that they all are of a recent enough version to support thread-local storage). This is intended to be used in upcoming patches that implement graceful (but TLS-dependant) error-handling in the library. As an added bonus, we also bring the online_cpus() function from git.git to detect the number of usable cpu's. Signed-off-by: Andreas Ericsson <ae@op5.se> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>

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• src/thread-utils.c

• #include "thread-utils.h"
  
  #ifdef _WIN32
  #  define WIN32_LEAN_AND_MEAN
  #  include <windows.h>
  #elif 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 git_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;
  }
  

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