396 строки
13 KiB
C
396 строки
13 KiB
C
/*
|
|
* Copyright (c) 2004-2008 The Trustees of Indiana University and Indiana
|
|
* University Research and Technology
|
|
* Corporation. All rights reserved.
|
|
* Copyright (c) 2004-2005 The University of Tennessee and The University
|
|
* of Tennessee Research Foundation. All rights
|
|
* reserved.
|
|
* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
|
|
* University of Stuttgart. All rights reserved.
|
|
* Copyright (c) 2004-2005 The Regents of the University of California.
|
|
* All rights reserved.
|
|
* Copyright (c) 2007-2010 Cisco Systems, Inc. All rights reserved.
|
|
* Copyright (c) 2008 Sun Microsystems, Inc. All rights reserved.
|
|
* Copyright (c) 2010-2011 Los Alamos National Security, LLC.
|
|
* All rights reserved.
|
|
*
|
|
* $COPYRIGHT$
|
|
*
|
|
* Additional copyrights may follow
|
|
*
|
|
* $HEADER$
|
|
*/
|
|
|
|
#include "opal_config.h"
|
|
|
|
#include <errno.h>
|
|
#ifdef HAVE_FCNTL_H
|
|
#include <fcntl.h>
|
|
#endif /* HAVE_FCNTL_H */
|
|
#ifdef HAVE_SYS_MMAN_H
|
|
#include <sys/mman.h>
|
|
#endif /* HAVE_SYS_MMAN_H */
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif /* HAVE_UNISTD_H */
|
|
#ifdef HAVE_SYS_TYPES_H
|
|
#include <sys/types.h>
|
|
#endif /* HAVE_SYS_TYPES_H */
|
|
#ifdef HAVE_SYS_IPC_H
|
|
#include <sys/ipc.h>
|
|
#endif /* HAVE_SYS_IPC_H */
|
|
#if HAVE_SYS_SHM_H
|
|
#include <sys/shm.h>
|
|
#endif /* HAVE_SYS_SHM_H */
|
|
#ifdef HAVE_STRING_H
|
|
#include <string.h>
|
|
#endif /* HAVE_STRING_H */
|
|
#ifdef HAVE_NETDB_H
|
|
#include <netdb.h>
|
|
#endif /* HAVE_NETDB_H */
|
|
|
|
#include "opal/constants.h"
|
|
#include "opal_stdint.h"
|
|
#include "opal/util/output.h"
|
|
#include "opal/util/path.h"
|
|
#include "opal/util/show_help.h"
|
|
#include "opal/mca/base/mca_base_param.h"
|
|
#include "opal/mca/shmem/shmem.h"
|
|
#include "opal/mca/shmem/base/base.h"
|
|
|
|
#include "shmem_sysv.h"
|
|
|
|
/* for tons of debug output: -mca shmem_base_verbose 70 */
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
/* local functions */
|
|
static int
|
|
module_init(void);
|
|
|
|
static int
|
|
segment_create(opal_shmem_ds_t *ds_buf,
|
|
const char *file_name,
|
|
size_t size);
|
|
|
|
static int
|
|
ds_copy(const opal_shmem_ds_t *from,
|
|
opal_shmem_ds_t *to);
|
|
|
|
static void *
|
|
segment_attach(opal_shmem_ds_t *ds_buf);
|
|
|
|
static int
|
|
segment_detach(opal_shmem_ds_t *ds_buf);
|
|
|
|
static int
|
|
segment_unlink(opal_shmem_ds_t *ds_buf);
|
|
|
|
static int
|
|
module_finalize(void);
|
|
|
|
/* sysv shmem module */
|
|
opal_shmem_sysv_module_t opal_shmem_sysv_module = {
|
|
/* super */
|
|
{
|
|
module_init,
|
|
segment_create,
|
|
ds_copy,
|
|
segment_attach,
|
|
segment_detach,
|
|
segment_unlink,
|
|
module_finalize
|
|
}
|
|
};
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
/* private utility functions */
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
/**
|
|
* completely resets the contents of *ds_buf
|
|
*/
|
|
static inline void
|
|
shmem_ds_reset(opal_shmem_ds_t *ds_buf)
|
|
{
|
|
OPAL_OUTPUT_VERBOSE(
|
|
(70, opal_shmem_base_output,
|
|
"%s: %s: shmem_ds_resetting "
|
|
"(opid: %lu id: %d, size: %lu, name: %s)\n",
|
|
mca_shmem_sysv_component.super.base_version.mca_type_name,
|
|
mca_shmem_sysv_component.super.base_version.mca_component_name,
|
|
(unsigned long)ds_buf->opid, ds_buf->seg_id,
|
|
(unsigned long)ds_buf->seg_size, ds_buf->seg_name)
|
|
);
|
|
|
|
ds_buf->opid = 0;
|
|
ds_buf->seg_cpid = 0;
|
|
OPAL_SHMEM_DS_RESET_FLAGS(ds_buf);
|
|
ds_buf->seg_id = OPAL_SHMEM_DS_ID_INVALID;
|
|
ds_buf->seg_size = 0;
|
|
memset(ds_buf->seg_name, '\0', OPAL_PATH_MAX);
|
|
ds_buf->seg_base_addr = (unsigned char *)-1;
|
|
}
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
static int
|
|
module_init(void)
|
|
{
|
|
/* nothing to do */
|
|
return OPAL_SUCCESS;
|
|
}
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
static int
|
|
module_finalize(void)
|
|
{
|
|
/* nothing to do */
|
|
return OPAL_SUCCESS;
|
|
}
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
static int
|
|
ds_copy(const opal_shmem_ds_t *from,
|
|
opal_shmem_ds_t *to)
|
|
{
|
|
/* SKG */
|
|
to->flags = from->flags;
|
|
to->seg_base_addr = from->seg_base_addr;
|
|
to->opid = from->opid;
|
|
to->seg_id = from->seg_id;
|
|
to->seg_size = from->seg_size;
|
|
to->seg_cpid = from->seg_cpid;
|
|
memcpy(to->seg_name, from->seg_name, OPAL_PATH_MAX);
|
|
|
|
OPAL_OUTPUT_VERBOSE(
|
|
(70, opal_shmem_base_output,
|
|
"%s: %s: ds_copy complete "
|
|
"from: (opid: %lu, id: %d, size: %lu, "
|
|
"name: %s flags: 0x%02x) "
|
|
"to: (opid: %lu, id: %d, size: %lu, "
|
|
"name: %s flags: 0x%02x)\n",
|
|
mca_shmem_sysv_component.super.base_version.mca_type_name,
|
|
mca_shmem_sysv_component.super.base_version.mca_component_name,
|
|
(unsigned long)from->opid, from->seg_id, (unsigned long)from->seg_size,
|
|
from->seg_name, from->flags, (unsigned long)to->opid, to->seg_id,
|
|
(unsigned long)to->seg_size, to->seg_name, to->flags)
|
|
);
|
|
|
|
return OPAL_SUCCESS;
|
|
}
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
static int
|
|
segment_create(opal_shmem_ds_t *ds_buf,
|
|
const char *file_name,
|
|
size_t size)
|
|
{
|
|
int rc = OPAL_SUCCESS;
|
|
pid_t my_pid = getpid();
|
|
/* the real size of the shared memory segment. this includes enough space
|
|
* to store our segment header.
|
|
*/
|
|
size_t real_size = size + sizeof(opal_shmem_seg_hdr_t);
|
|
opal_shmem_seg_hdr_t *seg_hdrp = MAP_FAILED;
|
|
|
|
/* init the contents of opal_shmem_ds_t */
|
|
shmem_ds_reset(ds_buf);
|
|
|
|
/* for sysv shared memory we don't have to worry about the backing store
|
|
* being located on a network file system... so no check is needed here.
|
|
*/
|
|
|
|
/* create a new shared memory segment and save the shmid. note the use of
|
|
* real_size here
|
|
*/
|
|
if (-1 == (ds_buf->seg_id = shmget(IPC_PRIVATE, real_size,
|
|
IPC_CREAT | IPC_EXCL | SHM_R | SHM_W))) {
|
|
int err = errno;
|
|
char hn[MAXHOSTNAMELEN];
|
|
gethostname(hn, MAXHOSTNAMELEN - 1);
|
|
hn[MAXHOSTNAMELEN - 1] = '\0';
|
|
opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
|
|
"shmget(2)", "", strerror(err), err);
|
|
rc = OPAL_ERROR;
|
|
goto out;
|
|
}
|
|
/* attach to the sement */
|
|
else if ((void *)-1 == (seg_hdrp = shmat(ds_buf->seg_id, NULL, 0))) {
|
|
int err = errno;
|
|
char hn[MAXHOSTNAMELEN];
|
|
gethostname(hn, MAXHOSTNAMELEN - 1);
|
|
hn[MAXHOSTNAMELEN - 1] = '\0';
|
|
opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
|
|
"shmat(2)", "", strerror(err), err);
|
|
shmctl(ds_buf->seg_id, IPC_RMID, NULL);
|
|
rc = OPAL_ERROR;
|
|
goto out;
|
|
}
|
|
/* mark the segment for destruction - if we are here, then the run-time
|
|
* component selection test detected adequate support for this type of
|
|
* thing.
|
|
*/
|
|
else if (0 != shmctl(ds_buf->seg_id, IPC_RMID, NULL)) {
|
|
int err = errno;
|
|
char hn[MAXHOSTNAMELEN];
|
|
gethostname(hn, MAXHOSTNAMELEN - 1);
|
|
hn[MAXHOSTNAMELEN - 1] = '\0';
|
|
opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
|
|
"shmctl(2)", "", strerror(err), err);
|
|
rc = OPAL_ERROR;
|
|
goto out;
|
|
}
|
|
/* all is well */
|
|
else {
|
|
/* -- initialize the shared memory segment -- */
|
|
opal_atomic_rmb();
|
|
|
|
/* init segment lock */
|
|
opal_atomic_init(&seg_hdrp->lock, OPAL_ATOMIC_UNLOCKED);
|
|
/* i was the creator of this segment, so note that fact */
|
|
seg_hdrp->cpid = my_pid;
|
|
|
|
opal_atomic_wmb();
|
|
|
|
/* -- initialize the contents of opal_shmem_ds_t -- */
|
|
ds_buf->opid = my_pid;
|
|
ds_buf->seg_cpid = my_pid;
|
|
ds_buf->seg_size = real_size;
|
|
ds_buf->seg_base_addr = (unsigned char *)seg_hdrp;
|
|
|
|
/* notice that we are not setting ds_buf->name here. sysv doesn't use
|
|
* it, so don't worry about it - shmem_ds_reset took care of
|
|
* initialization, so we aren't passing garbage around.
|
|
*/
|
|
|
|
/* set "valid" bit because setment creation was successful */
|
|
OPAL_SHMEM_DS_SET_VALID(ds_buf);
|
|
|
|
OPAL_OUTPUT_VERBOSE(
|
|
(70, opal_shmem_base_output,
|
|
"%s: %s: create successful "
|
|
"(opid: %lu id: %d, size: %lu, name: %s)\n",
|
|
mca_shmem_sysv_component.super.base_version.mca_type_name,
|
|
mca_shmem_sysv_component.super.base_version.mca_component_name,
|
|
(unsigned long)ds_buf->opid, ds_buf->seg_id,
|
|
(unsigned long)ds_buf->seg_size, ds_buf->seg_name)
|
|
);
|
|
}
|
|
|
|
out:
|
|
/* an error occured, so invalidate the shmem object and release any
|
|
* allocated resources.
|
|
*/
|
|
if (OPAL_SUCCESS != rc) {
|
|
/* best effort to delete the segment. */
|
|
if ((void *)-1 != seg_hdrp) {
|
|
shmdt(seg_hdrp);
|
|
}
|
|
shmctl(ds_buf->seg_id, IPC_RMID, NULL);
|
|
|
|
/* always invalidate in this error path */
|
|
shmem_ds_reset(ds_buf);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
/**
|
|
* segment_attach can only be called after a successful call to segment_create
|
|
*/
|
|
static void *
|
|
segment_attach(opal_shmem_ds_t *ds_buf)
|
|
{
|
|
pid_t my_pid = getpid();
|
|
|
|
if (my_pid != ds_buf->seg_cpid) {
|
|
if ((void *)-1 == (ds_buf->seg_base_addr = shmat(ds_buf->seg_id, NULL,
|
|
0))) {
|
|
int err = errno;
|
|
char hn[MAXHOSTNAMELEN];
|
|
gethostname(hn, MAXHOSTNAMELEN - 1);
|
|
hn[MAXHOSTNAMELEN - 1] = '\0';
|
|
opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
|
|
"shmat(2)", "", strerror(err), err);
|
|
shmctl(ds_buf->seg_id, IPC_RMID, NULL);
|
|
return NULL;
|
|
}
|
|
}
|
|
/* else i was the segment creator. nothing to do here because all the hard
|
|
* work was done in segment_create :-).
|
|
*/
|
|
|
|
OPAL_OUTPUT_VERBOSE(
|
|
(70, opal_shmem_base_output,
|
|
"%s: %s: attach successful "
|
|
"(opid: %lu id: %d, size: %lu, name: %s)\n",
|
|
mca_shmem_sysv_component.super.base_version.mca_type_name,
|
|
mca_shmem_sysv_component.super.base_version.mca_component_name,
|
|
(unsigned long)ds_buf->opid, ds_buf->seg_id,
|
|
(unsigned long)ds_buf->seg_size, ds_buf->seg_name)
|
|
);
|
|
|
|
/* update returned base pointer with an offset that hides our stuff */
|
|
return (ds_buf->seg_base_addr + sizeof(opal_shmem_seg_hdr_t));
|
|
}
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
static int
|
|
segment_detach(opal_shmem_ds_t *ds_buf)
|
|
{
|
|
int rc = OPAL_SUCCESS;
|
|
|
|
OPAL_OUTPUT_VERBOSE(
|
|
(70, opal_shmem_base_output,
|
|
"%s: %s: detaching "
|
|
"(opid: %lu id: %d, size: %lu, name: %s)\n",
|
|
mca_shmem_sysv_component.super.base_version.mca_type_name,
|
|
mca_shmem_sysv_component.super.base_version.mca_component_name,
|
|
(unsigned long)ds_buf->opid, ds_buf->seg_id,
|
|
(unsigned long)ds_buf->seg_size, ds_buf->seg_name)
|
|
);
|
|
|
|
if (0 != shmdt(ds_buf->seg_base_addr)) {
|
|
int err = errno;
|
|
char hn[MAXHOSTNAMELEN];
|
|
gethostname(hn, MAXHOSTNAMELEN - 1);
|
|
hn[MAXHOSTNAMELEN - 1] = '\0';
|
|
opal_show_help("help-opal-shmem-sysv.txt", "sys call fail", 1, hn,
|
|
"shmdt(2)", "", strerror(err), err);
|
|
rc = OPAL_ERROR;
|
|
}
|
|
|
|
/* reset the contents of the opal_shmem_ds_t associated with this
|
|
* shared memory segment.
|
|
*/
|
|
shmem_ds_reset(ds_buf);
|
|
return rc;
|
|
}
|
|
|
|
/* ////////////////////////////////////////////////////////////////////////// */
|
|
static int
|
|
segment_unlink(opal_shmem_ds_t *ds_buf)
|
|
{
|
|
/* not much unlink work needed for sysv */
|
|
|
|
OPAL_OUTPUT_VERBOSE(
|
|
(70, opal_shmem_base_output,
|
|
"%s: %s: unlinking "
|
|
"(opid: %lu id: %d, size: %lu, name: %s)\n",
|
|
mca_shmem_sysv_component.super.base_version.mca_type_name,
|
|
mca_shmem_sysv_component.super.base_version.mca_component_name,
|
|
(unsigned long)ds_buf->opid, ds_buf->seg_id,
|
|
(unsigned long)ds_buf->seg_size, ds_buf->seg_name)
|
|
);
|
|
|
|
/* don't completely reset the opal_shmem_ds_t. in particular, only reset
|
|
* the id and flip the invalid bit. size and name values will remain valid
|
|
* across unlinks. other information stored in flags will remain untouched.
|
|
*/
|
|
ds_buf->seg_id = OPAL_SHMEM_DS_ID_INVALID;
|
|
/* note: this is only chaning the valid bit to 0. */
|
|
OPAL_SHMEM_DS_INVALIDATE(ds_buf);
|
|
return OPAL_SUCCESS;
|
|
}
|
|
|