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703ec3d6ce
openmpi/opal/mca/base/mca_base_component_find.c
Ralph Castain 703ec3d6ce Some minor cleanups to the handling of multi-path component find 
This commit was SVN r22275.
2009-12-08 09:34:49 +00:00

910 строки
30 KiB
C
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/*
* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
* University Research and Technology
* Corporation. All rights reserved.
* Copyright (c) 2004-2007 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) 2008-2009 Cisco Systems, Inc. All rights reserved.
* Copyright (c) 2008 Sun Microsystems, Inc. All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
#include "opal_config.h"
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#if OPAL_WANT_LIBLTDL
#ifndef __WINDOWS__
#include "opal/libltdl/ltdl.h"
#else
#include "ltdl.h"
#endif
#endif
#include "opal/mca/installdirs/installdirs.h"
#include "opal/util/opal_environ.h"
#include "opal/util/output.h"
#include "opal/util/argv.h"
#include "opal/util/show_help.h"
#include "opal/class/opal_list.h"
#include "opal/mca/mca.h"
#include "opal/mca/base/base.h"
#include "opal/mca/base/mca_base_component_repository.h"
#include "opal/constants.h"
#if OPAL_WANT_LIBLTDL
/*
* Private types; only necessary when we're dlopening components.
*/
typedef enum component_status {
UNVISITED,
FAILED_TO_LOAD,
CHECKING_CYCLE,
LOADED,
STATUS_MAX
} component_status_t;
struct component_file_item_t {
opal_list_item_t super;
char type[MCA_BASE_MAX_TYPE_NAME_LEN + 1];
char name[MCA_BASE_MAX_COMPONENT_NAME_LEN + 1];
char basename[OPAL_PATH_MAX + 1];
char filename[OPAL_PATH_MAX + 1];
component_status_t status;
};
typedef struct component_file_item_t component_file_item_t;
static OBJ_CLASS_INSTANCE(component_file_item_t, opal_list_item_t, NULL, NULL);
struct dependency_item_t {
opal_list_item_t super;
component_file_item_t *di_component_file_item;
};
typedef struct dependency_item_t dependency_item_t;
static OBJ_CLASS_INSTANCE(dependency_item_t, opal_list_item_t, NULL, NULL);
#if OPAL_HAVE_LTDL_ADVISE
extern lt_dladvise opal_mca_dladvise;
#endif
#endif /* OPAL_WANT_LIBLTDL */
#if OPAL_WANT_LIBLTDL
/*
* Private functions
*/
static void find_dyn_components(const char *path, const char *type,
const char **names, bool include_mode,
opal_list_t *found_components);
static int save_filename(const char *filename, lt_ptr data);
static int open_component(component_file_item_t *target_file,
opal_list_t *found_components);
static int check_ompi_info(component_file_item_t *target_file,
opal_list_t *dependencies,
opal_list_t *found_components);
static int check_dependency(char *line, component_file_item_t *target_file,
opal_list_t *dependencies,
opal_list_t *found_components);
static void free_dependency_list(opal_list_t *dependencies);
/*
* Private variables
*/
static const char *ompi_info_suffix = ".ompi_info";
static const char *key_dependency = "dependency=";
static const char component_template[] = "mca_%s_";
static opal_list_t found_files;
static char **found_filenames = NULL;
#endif /* OPAL_WANT_LIBLTDL */
static bool use_component(const bool include_mode,
const char **requested_component_names,
const char *component_name);
/*
* Function to find as many components of a given type as possible. This
* includes statically-linked in components as well as opening up a
* directory and looking for shared-library MCA components of the
* appropriate type (load them if available).
*
* Return one consolidated array of (mca_base_component_t*) pointing to all
* available components.
*/
int mca_base_component_find(const char *directory, const char *type,
const mca_base_component_t *static_components[],
char **requested_component_names,
bool include_mode,
opal_list_t *found_components,
bool open_dso_components)
{
int i;
opal_list_item_t *item;
mca_base_component_list_item_t *cli;
/* Find all the components that were statically linked in */
OBJ_CONSTRUCT(found_components, opal_list_t);
for (i = 0; NULL != static_components[i]; ++i) {
if ( use_component(include_mode,
(const char**)requested_component_names,
static_components[i]->mca_component_name) ) {
cli = OBJ_NEW(mca_base_component_list_item_t);
if (NULL == cli) {
return OPAL_ERR_OUT_OF_RESOURCE;
}
cli->cli_component = static_components[i];
opal_list_append(found_components, (opal_list_item_t *) cli);
}
}
#if OPAL_WANT_LIBLTDL
/* Find any available dynamic components in the specified directory */
if (open_dso_components) {
int param, param_disable_dlopen;
param = mca_base_param_find("mca", NULL, "component_disable_dlopen");
mca_base_param_lookup_int(param, &param_disable_dlopen);
if (0 == param_disable_dlopen) {
find_dyn_components(directory, type,
(const char**)requested_component_names,
include_mode, found_components);
}
} else {
opal_output_verbose(40, 0,
"mca: base: component_find: dso loading for %s MCA components disabled",
type);
}
#endif
/* Ensure that *all* requested components exist. Print a warning
and abort if they do not. */
for (i = 0; include_mode && NULL != requested_component_names &&
NULL != requested_component_names[i]; ++i) {
for (item = opal_list_get_first(found_components);
opal_list_get_end(found_components) != item;
item = opal_list_get_next(item)) {
cli = (mca_base_component_list_item_t*) item;
if (0 == strcmp(requested_component_names[i],
cli->cli_component->mca_component_name)) {
break;
}
}
if (opal_list_get_end(found_components) == item) {
char h[MAXHOSTNAMELEN];
gethostname(h, sizeof(h));
opal_show_help("help-mca-base.txt",
"find-available:not-valid", true,
h, type, requested_component_names[i]);
return OPAL_ERR_NOT_FOUND;
}
}
/* All done */
return OPAL_SUCCESS;
}
int mca_base_component_find_finalize(void)
{
#if OPAL_WANT_LIBLTDL
if (NULL != found_filenames) {
opal_argv_free(found_filenames);
found_filenames = NULL;
}
#endif
return OPAL_SUCCESS;
}
#if OPAL_WANT_LIBLTDL
/*
* Open up all directories in a given path and search for components of
* the specified type (and possibly of a given name).
*
* Note that we use our own path iteration functionality (vs. ltdl's
* lt_dladdsearchdir() functionality) because we need to look at
* companion .ompi_info files in the same directory as the library to
* generate dependencies, etc. If we use the plain lt_dlopen()
* functionality, we would not get the directory name of the file
* finally opened in recursive dependency traversals.
*/
static void find_dyn_components(const char *path, const char *type_name,
const char **names, bool include_mode,
opal_list_t *found_components)
{
int i, len;
char *path_to_use, *dir, *end;
component_file_item_t *file;
opal_list_item_t *cur;
char prefix[32 + MCA_BASE_MAX_TYPE_NAME_LEN], *basename;
char *system_default;
char *user_default=NULL;
/* copy the default location definitions */
#if OPAL_WANT_HOME_CONFIG_FILES
system_default = strdup(opal_install_dirs.pkglibdir);
asprintf(&user_default, "%s"OPAL_PATH_SEP".openmpi"OPAL_PATH_SEP"components", opal_home_directory());
#else
# if defined(__WINDOWS__) && defined(_DEBUG)
asprintf(&system_default, "%s/debug", opal_install_dirs.pkglibdir);
# else
asprintf(&system_default, "%s", opal_install_dirs.pkglibdir);
# endif
#endif
/* If path is NULL, iterate over the set of directories specified by
the MCA param mca_base_component_path. If path is not NULL, then
use that as the path. */
if (NULL == path) {
mca_base_param_lookup_string(mca_base_param_component_path,
&path_to_use);
if (NULL == path_to_use) {
/* If there's no path, then there's nothing to search -- we're
done */
return;
}
} else {
path_to_use = strdup(path);
}
/* If we haven't done so already, iterate over all the files in
the directories in the path and make a master array of all the
matching filenames that we find. Save the filenames in an
argv-style array. */
if (NULL == found_filenames) {
dir = path_to_use;
if (NULL != dir) {
do {
end = strchr(dir, OPAL_ENV_SEP);
if (NULL != end) {
*end = '\0';
}
if ((0 == strcmp(dir, "USER_DEFAULT") ||
0 == strcmp(dir, "USR_DEFAULT"))
&& NULL != user_default) {
if (0 != lt_dlforeachfile(user_default, save_filename, NULL)) {
break;
}
} else if (0 == strcmp(dir, "SYS_DEFAULT") ||
0 == strcmp(dir, "SYSTEM_DEFAULT")) {
if (0 != lt_dlforeachfile(system_default, save_filename, NULL)) {
break;
}
} else {
if (0 != lt_dlforeachfile(dir, save_filename, NULL)) {
break;
}
}
dir = end + 1;
} while (NULL != end);
}
}
free(system_default);
if (NULL != user_default) {
free(user_default);
}
/* Look through the list of found files and find those that match
the desired framework name */
snprintf(prefix, sizeof(prefix) - 1, component_template, type_name);
len = strlen(prefix);
OBJ_CONSTRUCT(&found_files, opal_list_t);
for (i = 0; NULL != found_filenames && NULL != found_filenames[i]; ++i) {
basename = strrchr(found_filenames[i], '/');
if (NULL == basename) {
basename = found_filenames[i];
} else {
basename += 1;
}
if (0 != strncmp(basename, prefix, len)) {
continue;
}
/* We found a match; save all the relevant details in the
found_files list */
file = OBJ_NEW(component_file_item_t);
if (NULL == file) {
return;
}
strncpy(file->type, type_name, MCA_BASE_MAX_TYPE_NAME_LEN);
file->type[MCA_BASE_MAX_TYPE_NAME_LEN] = '\0';
strncpy(file->name, basename + len, MCA_BASE_MAX_COMPONENT_NAME_LEN);
file->name[MCA_BASE_MAX_COMPONENT_NAME_LEN] = '\0';
strncpy(file->basename, basename, OPAL_PATH_MAX);
file->basename[OPAL_PATH_MAX] = '\0';
strncpy(file->filename, found_filenames[i], OPAL_PATH_MAX);
file->filename[OPAL_PATH_MAX] = '\0';
file->status = UNVISITED;
#if defined(__WINDOWS__) && defined(_DEBUG)
/* remove the debug suffix 'd', otherwise we will fail to
load the module in later phase. */
file->name[strlen(file->name)-1] = '\0';
#endif
opal_list_append(&found_files, (opal_list_item_t *)
file);
}
/* Iterate through all the filenames that we found that matched
the framework we were looking for. Since one component may
[try to] call another to be loaded, only try to load the
UNVISITED files. Also, ignore the return code -- basically,
give every file one chance to try to load. If they load,
great. If not, great. */
for (cur = opal_list_get_first(&found_files);
opal_list_get_end(&found_files) != cur;
cur = opal_list_get_next(cur)) {
file = (component_file_item_t *) cur;
if( UNVISITED == file->status ) {
bool op = true;
file->status = CHECKING_CYCLE;
op = use_component(include_mode, names, file->name);
if( true == op ) {
open_component(file, found_components);
}
}
}
/* So now we have a final list of loaded components. We can free all
the file information. */
for (cur = opal_list_remove_first(&found_files);
NULL != cur;
cur = opal_list_remove_first(&found_files)) {
OBJ_RELEASE(cur);
}
OBJ_DESTRUCT(&found_files);
/* All done, now let's cleanup */
free(path_to_use);
}
/*
* Blindly save all filenames into an argv-style list. This function
* is the callback from lt_dlforeachfile().
*/
static int save_filename(const char *filename, lt_ptr data)
{
opal_argv_append_nosize(&found_filenames, filename);
return 0;
}
static int file_exists(const char *filename, const char *ext)
{
char *final;
struct stat buf;
int ret;
if (NULL != ext) {
asprintf(&final, "%s.%s", filename, ext);
} else {
final = strdup(filename);
}
if (NULL == final) {
return 0;
}
ret = stat(final, &buf);
free(final);
return (0 == ret ? 1 : 0);
}
/*
* Open a component, chasing down its dependencies first, if possible.
*/
static int open_component(component_file_item_t *target_file,
opal_list_t *found_components)
{
int show_errors, param;
lt_dlhandle component_handle;
mca_base_component_t *component_struct;
char *struct_name, *err;
opal_list_t dependencies;
opal_list_item_t *cur;
mca_base_component_list_item_t *mitem;
dependency_item_t *ditem;
size_t len;
int vl;
opal_output_verbose(40, 0, "mca: base: component_find: examining dyanmic %s MCA component \"%s\"",
target_file->type, target_file->name);
opal_output_verbose(40, 0, "mca: base: component_find: %s", target_file->filename);
param = mca_base_param_find("mca", NULL, "component_show_load_errors");
mca_base_param_lookup_int(param, &show_errors);
vl = show_errors ? 0 : 40;
/* Was this component already loaded (e.g., via dependency)? */
if (LOADED == target_file->status) {
opal_output_verbose(40, 0, "mca: base: component_find: already loaded (ignored)");
return OPAL_SUCCESS;
}
/* Ensure that this component is not already loaded (should only happen
if it was statically loaded). It's an error if it's already
loaded because we're evaluating this file -- not this component.
Hence, returning OPAL_ERR_PARAM indicates that the *file* failed
to load, not the component. */
for (cur = opal_list_get_first(found_components);
opal_list_get_end(found_components) != cur;
cur = opal_list_get_next(cur)) {
mitem = (mca_base_component_list_item_t *) cur;
if (0 == strcmp(mitem->cli_component->mca_type_name, target_file->type) &&
0 == strcmp(mitem->cli_component->mca_component_name, target_file->name)) {
opal_output_verbose(40, 0, "mca: base: component_find: already loaded (ignored)");
target_file->status = FAILED_TO_LOAD;
return OPAL_ERR_BAD_PARAM;
}
}
/* Look at see if this component has any dependencies. If so, load
them. If we can't load them, then this component must also fail to
load. */
OBJ_CONSTRUCT(&dependencies, opal_list_t);
if (0 != check_ompi_info(target_file, &dependencies, found_components)) {
target_file->status = FAILED_TO_LOAD;
free_dependency_list(&dependencies);
return OPAL_ERR_OUT_OF_RESOURCE;
}
/* Now try to load the component */
#if OPAL_HAVE_LTDL_ADVISE
component_handle = lt_dlopenadvise(target_file->filename, opal_mca_dladvise);
#else
component_handle = lt_dlopenext(target_file->filename);
#endif
if (NULL == component_handle) {
err = strdup(lt_dlerror());
/* Because libltdl erroneously says "file not found" for any type
of error -- which is especially misleading when the file is
actually there but cannot be opened for some other reason
(e.g., missing symbol) -- do some simple huersitics and if the
file [probably] does exist, print a slightly better error
message. */
if (0 == strcmp("file not found", err) &&
(file_exists(target_file->filename, "lo") ||
file_exists(target_file->filename, "so") ||
file_exists(target_file->filename, "dylib") ||
file_exists(target_file->filename, "dll"))) {
free(err);
err = strdup("perhaps a missing symbol, or compiled for a different version of Open MPI?");
}
opal_output_verbose(vl, 0, "mca: base: component_find: unable to open %s: %s (ignored)",
target_file->filename, err);
free(err);
target_file->status = FAILED_TO_LOAD;
free_dependency_list(&dependencies);
return OPAL_ERR_BAD_PARAM;
}
/* Successfully opened the component; now find the public struct.
Malloc out enough space for it. */
len = strlen(target_file->type) + strlen(target_file->name) + 32;
struct_name = (char*)malloc(len);
if (NULL == struct_name) {
lt_dlclose(component_handle);
target_file->status = FAILED_TO_LOAD;
free_dependency_list(&dependencies);
return OPAL_ERR_OUT_OF_RESOURCE;
}
snprintf(struct_name, len, "mca_%s_%s_component", target_file->type,
target_file->name);
mitem = OBJ_NEW(mca_base_component_list_item_t);
if (NULL == mitem) {
free(struct_name);
lt_dlclose(component_handle);
target_file->status = FAILED_TO_LOAD;
free_dependency_list(&dependencies);
return OPAL_ERR_OUT_OF_RESOURCE;
}
component_struct = (mca_base_component_t*)lt_dlsym(component_handle, struct_name);
if (NULL == component_struct) {
opal_output_verbose(vl, 0, "mca: base: component_find: \"%s\" does not appear to be a valid "
"%s MCA dynamic component (ignored): %s",
target_file->basename, target_file->type, lt_dlerror());
free(mitem);
free(struct_name);
lt_dlclose(component_handle);
target_file->status = FAILED_TO_LOAD;
free_dependency_list(&dependencies);
return OPAL_ERR_BAD_PARAM;
}
/* We found the public struct. Make sure its MCA major.minor
version is the same as ours. */
if (!(MCA_BASE_VERSION_MAJOR == component_struct->mca_major_version &&
MCA_BASE_VERSION_MINOR == component_struct->mca_minor_version)) {
opal_output_verbose(vl, 0, "mca: base: component_find: %s \"%s\" uses an MCA interface that is not recognized (component MCA v%d.%d.%d != supported MCA v%d.%d.%d) -- ignored",
target_file->type, target_file->basename,
component_struct->mca_major_version,
component_struct->mca_minor_version,
component_struct->mca_release_version,
MCA_BASE_VERSION_MAJOR,
MCA_BASE_VERSION_MINOR,
MCA_BASE_VERSION_RELEASE);
free(mitem);
free(struct_name);
lt_dlclose(component_handle);
target_file->status = FAILED_TO_LOAD;
free_dependency_list(&dependencies);
return OPAL_ERR_BAD_PARAM;
}
/* Also check that the component struct framework and component
names match the expected names from the filename */
if (0 != strcmp(component_struct->mca_type_name, target_file->type) ||
0 != strcmp(component_struct->mca_component_name, target_file->name)) {
opal_output_verbose(vl, 0, "Component file data does not match filename: %s (%s / %s) != %s %s -- ignored",
target_file->filename, target_file->type, target_file->name,
component_struct->mca_type_name,
component_struct->mca_component_name);
free(mitem);
free(struct_name);
lt_dlclose(component_handle);
target_file->status = FAILED_TO_LOAD;
free_dependency_list(&dependencies);
return OPAL_ERR_BAD_PARAM;
}
/* Alles gut. Save the component struct, and register this
component to be closed later. */
mitem->cli_component = component_struct;
opal_list_append(found_components, (opal_list_item_t *) mitem);
mca_base_component_repository_retain(target_file->type, component_handle,
component_struct);
/* Now that that's all done, link all the dependencies in to this
component's repository entry */
for (cur = opal_list_remove_first(&dependencies);
NULL != cur;
cur = opal_list_remove_first(&dependencies)) {
ditem = (dependency_item_t *) cur;
mca_base_component_repository_link(target_file->type,
target_file->name,
ditem->di_component_file_item->type,
ditem->di_component_file_item->name);
OBJ_RELEASE(ditem);
}
OBJ_DESTRUCT(&dependencies);
opal_output_verbose(40, 0, "mca: base: component_find: opened dynamic %s MCA component \"%s\"",
target_file->type, target_file->name);
target_file->status = LOADED;
/* All done */
free(struct_name);
return OPAL_SUCCESS;
}
/*
* For a given filename, see if there exists a filename.ompi_info, which
* lists dependencies that must be loaded before this component is
* loaded. If we find this file, try to load those components first.
*
* Detect dependency cycles and error out.
*/
static int check_ompi_info(component_file_item_t *target_file,
opal_list_t *dependencies,
opal_list_t *found_components)
{
size_t len;
FILE *fp;
char *depname;
char buffer[BUFSIZ], *p;
/* Form the filename */
len = strlen(target_file->filename) + strlen(ompi_info_suffix) + 16;
depname = (char*)malloc(len);
if (NULL == depname)
return OPAL_ERR_OUT_OF_RESOURCE;
snprintf(depname, len, "%s%s", target_file->filename, ompi_info_suffix);
/* Try to open the file. If there's no file, return success (i.e.,
there are no dependencies). */
if (NULL == (fp = fopen(depname, "r"))) {
free(depname);
return 0;
}
/* Otherwise, loop reading the lines in the file and trying to load
them. Return failure upon the first component that fails to
load. */
opal_output_verbose(40, 0, "mca: base: component_find: opening ompi_info file: %s", depname);
while (NULL != fgets(buffer, BUFSIZ, fp)) {
/* Perl chomp */
buffer[BUFSIZ - 1] = '\0';
len = strlen(buffer);
if ('\n' == buffer[len - 1])
buffer[len - 1] = '\0';
/* Ignore emtpy lines and lines beginning with "#" or "//" */
for (p = buffer; '\0' != p; ++p)
if (!isspace(*p))
break;
if ('\0' == *p)
continue;
else if (*p == '#' || ('/' == *p && '/' == *(p + 1)))
continue;
/* Is it a dependency? */
else if (0 == strncasecmp(p, key_dependency, strlen(key_dependency))) {
if (OPAL_SUCCESS != check_dependency(p + strlen(key_dependency),
target_file, dependencies,
found_components)) {
fclose(fp);
free(depname);
/* We can leave any successfully loaded dependencies; we might
need them again later. But free the dependency list for
this component, because since [at least] one of them didn't
load, we have to pretend like all of them didn't load and
disallow loading this component. So free the dependency
list. */
free_dependency_list(dependencies);
return OPAL_ERR_OUT_OF_RESOURCE;
}
}
}
opal_output_verbose(40, 0, "mca: base: component_find: ompi_info file closed (%s)",
target_file->basename);
/* All done -- all depenencies satisfied */
fclose(fp);
free(depname);
return 0;
}
/*
* A DEPENDENCY key was found in the ompi_info file. Chase it down: see
* if we've already got such a component loaded, or go try to load it if
* it's not already loaded.
*/
static int check_dependency(char *line, component_file_item_t *target_file,
opal_list_t *dependencies,
opal_list_t *found_components)
{
bool happiness;
char buffer[BUFSIZ];
char *type, *name;
int len;
component_file_item_t *mitem;
dependency_item_t *ditem;
opal_list_item_t *cur;
/* Ensure that this was a valid dependency statement */
type = line;
name = strchr(line, OPAL_ENV_SEP);
if (NULL == name) {
return OPAL_ERR_OUT_OF_RESOURCE;
}
*name = '\0';
++name;
/* Form the name of the component to compare to */
if (strlen(type) + strlen(name) + 32 >= BUFSIZ) {
target_file->status = FAILED_TO_LOAD;
return OPAL_ERR_OUT_OF_RESOURCE;
}
snprintf(buffer, BUFSIZ, component_template, type);
len = strlen(buffer);
strncat(buffer, name, BUFSIZ - len);
/* Traverse down the list of files that we have, and see if we can
find it */
mitem = NULL;
target_file->status = CHECKING_CYCLE;
for (happiness = false, cur = opal_list_get_first(&found_files);
opal_list_get_end(&found_files) != cur;
cur = opal_list_get_next(cur)) {
mitem = (component_file_item_t *) cur;
/* Compare the name to the basename */
if (0 != strcmp(mitem->basename, buffer))
continue;
/* Catch the bozo dependency on itself */
else if (mitem == target_file) {
opal_output_verbose(40, 0,
"mca: base: component_find: component depends on itself (ignored dependency)");
happiness = true;
break;
}
/* If it's loaded, great -- we're done (no need to check that
dependency sub-tree) */
else if (LOADED == mitem->status) {
opal_output_verbose(40, 0, "mca: base: component_find: dependency has already been loaded (%s)",
mitem->basename);
happiness = true;
break;
}
/* If it's specifically not loaded (i.e., there was some kind of
error when we tried to load it), then we cannot meet the
dependencies. */
else if (FAILED_TO_LOAD == mitem->status) {
opal_output_verbose(40, 0, "mca: base: component_find: dependency previously failed to load (%s)",
mitem->basename);
break;
}
/* If we hit a cycle, return badness */
else if (CHECKING_CYCLE == mitem->status) {
opal_output_verbose(40, 0, "mca: base: component_find: found cycle! (%s)",
mitem->basename);
break;
}
/* Otherwise, this dependency has not been looked at yet. Go try
to load it. */
else if (UNVISITED == mitem->status) {
opal_output_verbose(40, 0, "mca: base: component_find: loading dependency (%s)",
mitem->basename);
if (OPAL_SUCCESS == open_component(target_file, found_components)) {
happiness = true;
} else {
opal_output_verbose(40, 0, "mca: base: component_find: dependency failed to load (%s)",
mitem->basename);
}
break;
}
}
/* Did we find the dependency? */
if (!happiness) {
target_file->status = FAILED_TO_LOAD;
return OPAL_ERR_BAD_PARAM;
}
/* The dependency loaded properly. Increment its refcount so that
it doesn't get unloaded before we get unloaded. The (NULL !=
mitem) check is somewhat redundant -- we won't be here in this
function unless there's dependencies to check, but a) it's safer
to double check, and b) it fixes a compiler warning. :-) */
if (NULL != mitem) {
ditem = OBJ_NEW(dependency_item_t);
if (NULL == ditem) {
return OPAL_ERR_OUT_OF_RESOURCE;
}
ditem->di_component_file_item = mitem;
opal_list_append(dependencies, (opal_list_item_t*) ditem);
}
/* All done -- all depenencies satisfied */
return OPAL_SUCCESS;
}
/*
* Free a dependency list
*/
static void free_dependency_list(opal_list_t *dependencies)
{
opal_list_item_t *item;
for (item = opal_list_remove_first(dependencies);
NULL != item;
item = opal_list_remove_first(dependencies)) {
OBJ_RELEASE(item);
}
OBJ_DESTRUCT(dependencies);
}
#endif /* OPAL_WANT_LIBLTDL */
static bool use_component(const bool include_mode,
const char **requested_component_names,
const char *component_name)
{
bool found = false;
const char **req_comp_name = requested_component_names;
/*
* If no selection is specified then we use all components
* we can find.
*/
if (NULL == req_comp_name) {
return true;
}
while ( *req_comp_name != NULL ) {
if ( strcmp(component_name, *req_comp_name) == 0 ) {
found = true;
break;
}
req_comp_name++;
}
/*
* include_mode found | use
* --------------------+------
* 0 0 | true
* 0 1 | false
* 1 0 | false
* 1 1 | true
*
* -> inverted xor
* As xor is a binary operator let's implement it manually before
* a compiler screws it up.
*/
if ( (include_mode && found) || !(include_mode || found) ) {
return true;
} else {
return false;
}
}
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