view lib/nproc.h @ 17363:5a51fb7777a9

sys_select, sys_time: port 2013-01-30 Solaris 2.6 fix to Cygwin Problem reported by Marco Atzeri in <http://lists.gnu.org/archive/html/bug-gnulib/2013-03/msg00000.html>. * lib/sys_select.in.h [HAVE_SYS_SELECT_H && _CYGWIN_SYS_TIME_H]: Simply delegate to the system <sys/select.h> in this case too. Also, pay attention to _GL_SYS_SELECT_H_REDIRECT_FROM_SYS_TIME_H only if OSF/1, since otherwise Cygwin breaks, and it doesn't seem to be needed on Solaris either. * lib/sys_time.in.h [_CYGWIN_SYS_TIME_H]: Simply delgate to the system <sys/time.h> in this case.
author Paul Eggert <eggert@cs.ucla.edu>
date Tue, 19 Mar 2013 09:08:47 -0700
parents e542fd46ad6f
children 344018b6e5d7
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/* Detect the number of processors.

   Copyright (C) 2009-2013 Free Software Foundation, Inc.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, see <http://www.gnu.org/licenses/>.  */

/* Written by Glen Lenker and Bruno Haible.  */

/* Allow the use in C++ code.  */
#ifdef __cplusplus
extern "C" {
#endif

/* A "processor" in this context means a thread execution unit, that is either
   - an execution core in a (possibly multi-core) chip, in a (possibly multi-
     chip) module, in a single computer, or
   - a thread execution unit inside a core
     (hyper-threading, see <http://en.wikipedia.org/wiki/Hyper-threading>).
   Which of the two definitions is used, is unspecified.  */

enum nproc_query
{
  NPROC_ALL,                 /* total number of processors */
  NPROC_CURRENT,             /* processors available to the current process */
  NPROC_CURRENT_OVERRIDABLE  /* likewise, but overridable through the
                                OMP_NUM_THREADS environment variable */
};

/* Return the total number of processors.  The result is guaranteed to
   be at least 1.  */
extern unsigned long int num_processors (enum nproc_query query);

#ifdef __cplusplus
}
#endif /* C++ */