566a050c23
- move files out of toplevel include/ and etc/, moving it into the
sub-projects
- rather than including config headers with <project>/include,
have them as <project>
- require all headers to be included with a project prefix, with
the exception of the config headers ({opal,orte,ompi}_config.h
mpi.h, and mpif.h)
This commit was SVN r8985.
110 строки
3.7 KiB
C
110 строки
3.7 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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/**
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* @file
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*
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* Processor affinity for Linux.
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*
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* Linux sucks. There are at least 3 different ways that
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* sched_setaffinity is implemented (only one of which -- the most
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* outdated -- is documented in the sched_setaffinity(2) man page):
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*
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*-----------------------------------------------------------------
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* 1. int sched_setaffinity(pid_t pid, unsigned int len, unsigned
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* long *mask);
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*
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* This originated in 2.5 kernels (which we won't worry about) and
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* some distros back-ported it to their 2.4 kernels. It's unknown if
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* this appears in any 2.6 kernels.
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*
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* 2. int sched_setaffinity (pid_t __pid, size_t __cpusetsize,
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* const cpu_set_t *__cpuset);
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*
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* This appears to be in recent 2.6 kernels (confirmed in Gentoo
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* 2.6.11). I don't know when #1 changed into #2. However, this
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* prototype is nice -- the cpu_set_t type is accompanied by
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* fdset-like CPU_ZERO(), CPU_SET(), CPU_ISSET(), etc. macros.
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*
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* 3. int sched_setaffinity (pid_t __pid, const cpu_set_t *__mask);
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*
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* (note the missing len parameter) This is in at least some Linux
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* distros (e.g., MDK 10.0 with a 2.6.3 kernel, and SGI Altix, even
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* though the Altix uses a 2.4-based kernel and therefore likely
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* back-ported the 2.5 work but modified it for their needs). Similar
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* to #2, the cpu_set_t type is accompanied by fdset-like CPU_ZERO(),
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* CPU_SET(), CPU_ISSET(), etc. macros.
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*-----------------------------------------------------------------
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*
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* This component has to figure out which one to use. :-\
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*
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* Also note that at least some distros of Linux have a broken
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* CPU_ZERO macro (a pair of typos in /usr/include/bits/sched.h).
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* MDK 9.2 is the screaming example, but it's pretty old and
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* probably only matters because one of the developers uses that as
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* a compilation machine :-) (it also appears to have been fixed in
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* MDK 10.0, but they also changed from #2 to #3 -- arrgh!).
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* However, there's no way of knowing where these typos came from
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* and if they exist elsewhere. So it seems safest to extend this
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* configure script to check for a bad CPU_ZERO macro. #$%#@%$@!!!
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*/
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#ifndef MCA_PAFFINITY_LINUX_EXPORT_H
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#define MCA_PAFFINITY_LINUX_EXPORT_H
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#include "opal_config.h"
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#include "opal/mca/mca.h"
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#include "opal/mca/paffinity/paffinity.h"
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/**
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* Determine whether we have a working CPU_ZERO() macro or not. If
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* not, use memset().
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*/
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#ifdef HAVE_CPU_ZERO
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#define OMPI_CPU_ZERO(foo) CPU_ZERO(foo)
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#else
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#include <string.h>
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#define OMPI_CPU_ZERO(foo) memset(foo, 0, sizeof(*foo))
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#endif
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#if defined(c_plusplus) || defined(__cplusplus)
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extern "C" {
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#endif
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/**
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* Globally exported variable
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*/
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OMPI_COMP_EXPORT extern const opal_paffinity_base_component_1_0_0_t
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mca_paffinity_linux_component;
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/**
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* paffinity query API function
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*/
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const opal_paffinity_base_module_1_0_0_t *
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opal_paffinity_linux_component_query(int *query);
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#if defined(c_plusplus) || defined(__cplusplus)
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}
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#endif
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#endif /* MCA_PAFFINITY_LINUX_EXPORT_H */
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