226 строки
7.4 KiB
C
226 строки
7.4 KiB
C
/*
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* Copyright (c) 2004-2008 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 (c) 2007-2013 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2010-2011 Los Alamos National Security, LLC.
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* All rights reserved.
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* Copyright (c) 2011 NVIDIA Corporation. 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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* These symbols are in a file by themselves to provide nice linker
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* semantics. Since linkers generally pull in symbols by object
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* files, keeping these symbols as the only symbols in this file
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* prevents utility programs such as "ompi_info" from having to import
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* entire components just to query their version and parameters.
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*/
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#include "opal_config.h"
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif /* HAVE_SYS_MMAN_H */
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif /* HAVE_STRING_H */
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#ifdef HAVE_SYS_IPC_H
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#include <sys/ipc.h>
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#endif /* HAVE_SYS_IPC_H */
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#if HAVE_SYS_SHM_H
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#include <sys/shm.h>
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#endif /* HAVE_SYS_SHM_H */
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#if HAVE_SYS_STAT_H
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#include <sys/stat.h>
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#endif /* HAVE_SYS_STAT_H */
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#include "opal/constants.h"
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#include "opal/util/show_help.h"
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#include "opal/util/output.h"
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#include "opal/mca/shmem/base/base.h"
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#include "opal/mca/shmem/shmem.h"
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#include "shmem_sysv.h"
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/* public string showing the shmem ompi_sysv component version number */
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const char *opal_shmem_sysv_component_version_string =
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"OPAL sysv shmem MCA component version " OPAL_VERSION;
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/* local functions */
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static int sysv_register (void);
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static int sysv_open(void);
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static int sysv_query(mca_base_module_t **module, int *priority);
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static int sysv_runtime_query(mca_base_module_t **module,
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int *priority,
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const char *hint);
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/* instantiate the public struct with all of our public information
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* and pointers to our public functions in it
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*/
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opal_shmem_sysv_component_t mca_shmem_sysv_component = {
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/* ////////////////////////////////////////////////////////////////////// */
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/* super */
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/* ////////////////////////////////////////////////////////////////////// */
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{
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/* common MCA component data */
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{
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OPAL_SHMEM_BASE_VERSION_2_0_0,
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/* component name and version */
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"sysv",
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OPAL_MAJOR_VERSION,
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OPAL_MINOR_VERSION,
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OPAL_RELEASE_VERSION,
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/* component open */
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sysv_open,
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/* component close */
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NULL,
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/* component query */
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sysv_query,
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sysv_register
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},
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/* MCA v2.0.0 component meta data */
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{
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/* the component is checkpoint ready */
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MCA_BASE_METADATA_PARAM_CHECKPOINT
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},
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sysv_runtime_query,
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},
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/* ////////////////////////////////////////////////////////////////////// */
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/* sysv component-specific information */
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/* see: shmem_sysv.h for more information */
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};
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/* ////////////////////////////////////////////////////////////////////////// */
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static int
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sysv_register(void)
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{
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/* ////////////////////////////////////////////////////////////////////// */
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/* (default) priority - set lower than mmap's priority */
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mca_shmem_sysv_component.priority = 30;
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(void) mca_base_component_var_register(&mca_shmem_sysv_component.super.base_version,
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"priority", "Priority for the shmem sysv "
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"component (default: 30)", MCA_BASE_VAR_TYPE_INT,
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NULL, 0, MCA_BASE_VAR_FLAG_SETTABLE,
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OPAL_INFO_LVL_3,
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MCA_BASE_VAR_SCOPE_ALL_EQ,
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&mca_shmem_sysv_component.priority);
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return OPAL_SUCCESS;
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}
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/* ////////////////////////////////////////////////////////////////////////// */
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static int
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sysv_open(void)
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{
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return OPAL_SUCCESS;
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}
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/* ////////////////////////////////////////////////////////////////////////// */
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/**
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* this routine performs a test that indicates whether or not sysv shared
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* memory can safely be used during this run.
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* note: that we want to run this test as few times as possible.
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*
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* @return OPAL_SUCCESS when sysv can safely be used.
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*/
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static int
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sysv_runtime_query(mca_base_module_t **module, int *priority, const char *hint)
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{
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char c = 'j';
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int shmid = -1;
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char *a = NULL;
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char *addr = NULL;
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struct shmid_ds tmp_buff;
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*priority = 0;
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*module = NULL;
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/* if hint isn't null, then someone else already figured out who is the
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* best runnable component is AND the caller is relaying that info so we
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* don't have to perform a run-time query.
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*/
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if (NULL != hint) {
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_framework.framework_output,
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"shmem: sysv: runtime_query: "
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"attempting to use runtime hint (%s)\n", hint)
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);
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/* was i selected? if so, then we are done.
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* otherwise, disqualify myself.
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*/
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if (0 == strcasecmp(hint,
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mca_shmem_sysv_component.super.base_version.mca_component_name)) {
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*priority = mca_shmem_sysv_component.priority;
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*module = (mca_base_module_t *)&opal_shmem_sysv_module.super;
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return OPAL_SUCCESS;
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}
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else {
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*priority = 0;
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*module = NULL;
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return OPAL_SUCCESS;
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}
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}
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/* if we are here, then let the run-time test games begin */
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_framework.framework_output,
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"shmem: sysv: runtime_query: NO HINT PROVIDED:"
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"starting run-time test...\n")
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);
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if (-1 == (shmid = shmget(IPC_PRIVATE, (size_t)(getpagesize()),
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IPC_CREAT | IPC_EXCL | S_IRWXU ))) {
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goto out;
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}
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else if ((void *)-1 == (addr = shmat(shmid, NULL, 0))) {
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goto out;
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}
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/* protect against lazy establishment - may not be needed, but can't hurt */
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a = addr;
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*a = c;
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if (-1 == shmctl(shmid, IPC_RMID, NULL)) {
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goto out;
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}
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else if (-1 == shmctl(shmid, IPC_STAT, &tmp_buff)) {
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goto out;
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}
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/* all is well - rainbows and butterflies */
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else {
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*priority = mca_shmem_sysv_component.priority;
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*module = (mca_base_module_t *)&opal_shmem_sysv_module.super;
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}
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out:
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if ((char *)-1 != addr) {
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shmdt(addr);
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}
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return OPAL_SUCCESS;
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}
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/* ////////////////////////////////////////////////////////////////////////// */
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static int
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sysv_query(mca_base_module_t **module, int *priority)
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{
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*priority = mca_shmem_sysv_component.priority;
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*module = (mca_base_module_t *)&opal_shmem_sysv_module.super;
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return OPAL_SUCCESS;
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}
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