382 строки
12 KiB
C
382 строки
12 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) 2007-2010 Cisco Systems, Inc. All rights reserved.
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* Copyright (c) 2008 Sun Microsystems, 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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*
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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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#include "opal_config.h"
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#include <errno.h>
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#ifdef HAVE_FCNTL_H
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#include <fcntl.h>
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#endif /* HAVE_FCNTL_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_UNISTD_H
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#include <unistd.h>
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#endif /* HAVE_UNISTD_H */
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#ifdef HAVE_SYS_TYPES_H
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#include <sys/types.h>
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#endif /* HAVE_SYS_TYPES_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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#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_NETDB_H
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#include <netdb.h>
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#endif /* HAVE_NETDB_H */
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#include "opal/constants.h"
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#include "opal_stdint.h"
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#include "opal/util/output.h"
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#include "opal/util/path.h"
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#include "opal/util/show_help.h"
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#include "opal/mca/base/mca_base_param.h"
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#include "opal/mca/shmem/shmem.h"
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#include "opal/mca/shmem/base/base.h"
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#include "shmem_sysv.h"
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/* for tons of debug output: -mca shmem_base_verbose 70 */
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/* ////////////////////////////////////////////////////////////////////////// */
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/* local functions */
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static int
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module_init(void);
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static int
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segment_create(opal_shmem_ds_t *ds_buf,
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const char *file_name,
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size_t size);
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static int
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ds_copy(const opal_shmem_ds_t *from,
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opal_shmem_ds_t *to);
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static void *
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segment_attach(opal_shmem_ds_t *ds_buf);
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static int
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segment_detach(opal_shmem_ds_t *ds_buf);
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static int
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segment_unlink(opal_shmem_ds_t *ds_buf);
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static int
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module_finalize(void);
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/* sysv shmem module */
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opal_shmem_sysv_module_t opal_shmem_sysv_module = {
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/* super */
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{
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module_init,
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segment_create,
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ds_copy,
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segment_attach,
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segment_detach,
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segment_unlink,
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module_finalize
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}
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};
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/* ////////////////////////////////////////////////////////////////////////// */
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/* private utility functions */
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/* ////////////////////////////////////////////////////////////////////////// */
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/* ////////////////////////////////////////////////////////////////////////// */
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/**
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* completely resets the contents of *ds_buf
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*/
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static inline void
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shmem_ds_reset(opal_shmem_ds_t *ds_buf)
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{
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_output,
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"%s: %s: shmem_ds_resetting "
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"(id: %d, size: %lu, name: %s)\n",
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mca_shmem_sysv_component.super.base_version.mca_type_name,
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mca_shmem_sysv_component.super.base_version.mca_component_name,
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ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
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);
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ds_buf->seg_cpid = 0;
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OPAL_SHMEM_DS_RESET_FLAGS(ds_buf);
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ds_buf->seg_id = OPAL_SHMEM_DS_ID_INVALID;
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ds_buf->seg_size = 0;
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memset(ds_buf->seg_name, '\0', OPAL_PATH_MAX);
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ds_buf->seg_base_addr = (unsigned char *)-1;
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}
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/* ////////////////////////////////////////////////////////////////////////// */
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static int
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module_init(void)
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{
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/* nothing to do */
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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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module_finalize(void)
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{
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/* nothing to do */
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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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ds_copy(const opal_shmem_ds_t *from,
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opal_shmem_ds_t *to)
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{
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memcpy(to, from, sizeof(opal_shmem_ds_t));
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_output,
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"%s: %s: ds_copy complete "
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"from: (id: %d, size: %lu, "
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"name: %s flags: 0x%02x) "
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"to: (id: %d, size: %lu, "
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"name: %s flags: 0x%02x)\n",
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mca_shmem_sysv_component.super.base_version.mca_type_name,
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mca_shmem_sysv_component.super.base_version.mca_component_name,
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from->seg_id, (unsigned long)from->seg_size, from->seg_name,
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from->flags, to->seg_id, (unsigned long)to->seg_size, to->seg_name,
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to->flags)
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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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segment_create(opal_shmem_ds_t *ds_buf,
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const char *file_name,
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size_t size)
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{
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int rc = OPAL_SUCCESS;
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pid_t my_pid = getpid();
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/* the real size of the shared memory segment. this includes enough space
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* to store our segment header.
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*/
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size_t real_size = size + sizeof(opal_shmem_seg_hdr_t);
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opal_shmem_seg_hdr_t *seg_hdrp = MAP_FAILED;
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/* init the contents of opal_shmem_ds_t */
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shmem_ds_reset(ds_buf);
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/* for sysv shared memory we don't have to worry about the backing store
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* being located on a network file system... so no check is needed here.
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*/
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/* create a new shared memory segment and save the shmid. note the use of
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* real_size here
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*/
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if (-1 == (ds_buf->seg_id = shmget(IPC_PRIVATE, real_size,
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IPC_CREAT | IPC_EXCL | SHM_R | SHM_W))) {
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int err = errno;
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char hn[MAXHOSTNAMELEN];
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gethostname(hn, MAXHOSTNAMELEN - 1);
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hn[MAXHOSTNAMELEN - 1] = '\0';
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opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
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"shmget(2)", "", strerror(err), err);
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rc = OPAL_ERROR;
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goto out;
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}
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/* attach to the sement */
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else if ((void *)-1 == (seg_hdrp = shmat(ds_buf->seg_id, NULL, 0))) {
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int err = errno;
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char hn[MAXHOSTNAMELEN];
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gethostname(hn, MAXHOSTNAMELEN - 1);
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hn[MAXHOSTNAMELEN - 1] = '\0';
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opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
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"shmat(2)", "", strerror(err), err);
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shmctl(ds_buf->seg_id, IPC_RMID, NULL);
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rc = OPAL_ERROR;
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goto out;
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}
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/* mark the segment for destruction - if we are here, then the run-time
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* component selection test detected adequate support for this type of
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* thing.
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*/
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else if (0 != shmctl(ds_buf->seg_id, IPC_RMID, NULL)) {
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int err = errno;
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char hn[MAXHOSTNAMELEN];
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gethostname(hn, MAXHOSTNAMELEN - 1);
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hn[MAXHOSTNAMELEN - 1] = '\0';
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opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
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"shmctl(2)", "", strerror(err), err);
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rc = OPAL_ERROR;
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goto out;
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}
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/* all is well */
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else {
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/* -- initialize the shared memory segment -- */
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opal_atomic_rmb();
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/* init segment lock */
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opal_atomic_init(&seg_hdrp->lock, OPAL_ATOMIC_UNLOCKED);
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/* i was the creator of this segment, so note that fact */
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seg_hdrp->cpid = my_pid;
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opal_atomic_wmb();
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/* -- initialize the contents of opal_shmem_ds_t -- */
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ds_buf->seg_cpid = my_pid;
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ds_buf->seg_size = real_size;
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ds_buf->seg_base_addr = (unsigned char *)seg_hdrp;
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/* notice that we are not setting ds_buf->name here. sysv doesn't use
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* it, so don't worry about it - shmem_ds_reset took care of
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* initialization, so we aren't passing garbage around.
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*/
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/* set "valid" bit because setment creation was successful */
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OPAL_SHMEM_DS_SET_VALID(ds_buf);
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_output,
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"%s: %s: create successful "
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"(id: %d, size: %lu, name: %s)\n",
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mca_shmem_sysv_component.super.base_version.mca_type_name,
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mca_shmem_sysv_component.super.base_version.mca_component_name,
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ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
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);
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}
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out:
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/* an error occured, so invalidate the shmem object and release any
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* allocated resources.
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*/
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if (OPAL_SUCCESS != rc) {
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/* best effort to delete the segment. */
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if ((void *)-1 != seg_hdrp) {
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shmdt(seg_hdrp);
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}
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shmctl(ds_buf->seg_id, IPC_RMID, NULL);
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/* always invalidate in this error path */
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shmem_ds_reset(ds_buf);
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}
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return rc;
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}
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/* ////////////////////////////////////////////////////////////////////////// */
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/**
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* segment_attach can only be called after a successful call to segment_create
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*/
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static void *
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segment_attach(opal_shmem_ds_t *ds_buf)
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{
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pid_t my_pid = getpid();
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if (my_pid != ds_buf->seg_cpid) {
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if ((void *)-1 == (ds_buf->seg_base_addr = shmat(ds_buf->seg_id, NULL,
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0))) {
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int err = errno;
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char hn[MAXHOSTNAMELEN];
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gethostname(hn, MAXHOSTNAMELEN - 1);
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hn[MAXHOSTNAMELEN - 1] = '\0';
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opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
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"shmat(2)", "", strerror(err), err);
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shmctl(ds_buf->seg_id, IPC_RMID, NULL);
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return NULL;
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}
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}
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/* else i was the segment creator. nothing to do here because all the hard
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* work was done in segment_create :-).
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*/
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_output,
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"%s: %s: attach successful "
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"(id: %d, size: %lu, name: %s)\n",
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mca_shmem_sysv_component.super.base_version.mca_type_name,
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mca_shmem_sysv_component.super.base_version.mca_component_name,
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ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
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);
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/* update returned base pointer with an offset that hides our stuff */
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return (ds_buf->seg_base_addr + sizeof(opal_shmem_seg_hdr_t));
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}
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/* ////////////////////////////////////////////////////////////////////////// */
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static int
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segment_detach(opal_shmem_ds_t *ds_buf)
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{
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int rc = OPAL_SUCCESS;
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_output,
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"%s: %s: detaching "
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"(id: %d, size: %lu, name: %s)\n",
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mca_shmem_sysv_component.super.base_version.mca_type_name,
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mca_shmem_sysv_component.super.base_version.mca_component_name,
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ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
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);
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if (0 != shmdt(ds_buf->seg_base_addr)) {
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int err = errno;
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char hn[MAXHOSTNAMELEN];
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gethostname(hn, MAXHOSTNAMELEN - 1);
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hn[MAXHOSTNAMELEN - 1] = '\0';
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opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
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"shmdt(2)", "", strerror(err), err);
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rc = OPAL_ERROR;
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}
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/* reset the contents of the opal_shmem_ds_t associated with this
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* shared memory segment.
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*/
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shmem_ds_reset(ds_buf);
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return rc;
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}
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/* ////////////////////////////////////////////////////////////////////////// */
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static int
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segment_unlink(opal_shmem_ds_t *ds_buf)
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{
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/* not much unlink work needed for sysv */
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OPAL_OUTPUT_VERBOSE(
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(70, opal_shmem_base_output,
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"%s: %s: unlinking "
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"(id: %d, size: %lu, name: %s)\n",
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mca_shmem_sysv_component.super.base_version.mca_type_name,
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mca_shmem_sysv_component.super.base_version.mca_component_name,
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ds_buf->seg_id, (unsigned long)ds_buf->seg_size, ds_buf->seg_name)
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);
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/* don't completely reset the opal_shmem_ds_t. in particular, only reset
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* the id and flip the invalid bit. size and name values will remain valid
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* across unlinks. other information stored in flags will remain untouched.
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*/
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ds_buf->seg_id = OPAL_SHMEM_DS_ID_INVALID;
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/* note: this is only chaning the valid bit to 0. */
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OPAL_SHMEM_DS_INVALIDATE(ds_buf);
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return OPAL_SUCCESS;
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}
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