/* * Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana * University Research and Technology * Corporation. All rights reserved. * Copyright (c) 2004-2011 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) 2008-2013 University of Houston. All rights reserved. * Copyright (c) 2012-2013 Los Alamos National Security, Inc. All rights reserved. * $COPYRIGHT$ * * Additional copyrights may follow * * $HEADER$ */ #include "ompi_config.h" #include #include "opal/class/opal_list.h" #include "opal/util/argv.h" #include "opal/mca/mca.h" #include "opal/mca/base/base.h" #include "ompi/mca/sharedfp/sharedfp.h" #include "ompi/mca/sharedfp/base/base.h" #include "ompi/mca/io/ompio/io_ompio.h" /* * This structure is needed so that we can close the modules * which are not selected but were opened. mca_base_modules_close * which does this job for us requires a opal_list_t which contains * these modules */ struct queried_module_t { opal_list_item_t super; mca_sharedfp_base_component_t *om_component; mca_sharedfp_base_module_t *om_module; }; typedef struct queried_module_t queried_module_t; static OBJ_CLASS_INSTANCE(queried_module_t, opal_list_item_t, NULL, NULL); /* * Only one sharedfp module can be attached to each file. * * This module calls the query funtion on all the components that were * detected by sharedfp_base_open. This function is called on a * per-file basis. This function has the following function. * * 1. Iterate over the list of available_components * 2. Call the query function on each of these components. * 3. query function returns the structure containing pointers * to its module and its priority * 4. Select the module with the highest priority * 5. Call the init function on the selected module so that it does the * right setup for the file * 6. Call finalize on all the other modules which returned * their module but were unfortunate to not get selected */ int mca_sharedfp_base_file_select (struct mca_io_ompio_file_t *file, mca_base_component_t *preferred) { int priority; int best_priority; opal_list_item_t *item; mca_base_component_list_item_t *cli; mca_sharedfp_base_component_t *component; mca_sharedfp_base_component_t *best_component; mca_sharedfp_base_module_t *module; opal_list_t queried; queried_module_t *om; char *str; int err = MPI_SUCCESS; /* Check and see if a preferred component was provided. If it was provided then it should be used (if possible) */ if (NULL != preferred) { /* We have a preferred component. Check if it is available and if so, whether it wants to run */ str = &(preferred->mca_component_name[0]); opal_output_verbose(10, ompi_sharedfp_base_framework.framework_output, "sharedfp:base:file_select: Checking preferred component: %s", str); /* query the component for its priority and get its module structure. This is necessary to proceed */ component = (mca_sharedfp_base_component_t *)preferred; module = component->sharedfpm_file_query (file, &priority); if (NULL != module && NULL != module->sharedfp_module_init) { /* this query seems to have returned something legitimate * and we can now go ahead and initialize the * file with it * but first, the functions which * are null need to be filled in */ /*fill_null_pointers (module);*/ file->f_sharedfp = module; file->f_sharedfp_component = preferred; return module->sharedfp_module_init(file); } /* His preferred component is present, but is unable to * run. This is not a good sign. We should try selecting * some other component We let it fall through and select * from the list of available components */ } /*end of selection for preferred component */ /* * We fall till here if one of the two things happened: * 1. The preferred component was provided but for some reason was * not able to be selected * 2. No preferred component was provided * * All we need to do is to go through the list of available * components and find the one which has the highest priority and * use that for this file */ best_component = NULL; best_priority = -1; OBJ_CONSTRUCT(&queried, opal_list_t); OPAL_LIST_FOREACH(cli, &ompi_sharedfp_base_framework.framework_components, mca_base_component_list_item_t) { component = (mca_sharedfp_base_component_t *) cli->cli_component; opal_output_verbose(10, ompi_sharedfp_base_framework.framework_output, "select: initialising %s component %s", component->sharedfpm_version.mca_type_name, component->sharedfpm_version.mca_component_name); /* * we can call the query function only if there is a function :-) */ if (NULL == component->sharedfpm_file_query) { opal_output_verbose(10, ompi_sharedfp_base_framework.framework_output, "select: no query, ignoring the component"); } else { /* * call the query function and see what it returns */ module = component->sharedfpm_file_query (file, &priority); if (NULL == module || NULL == module->sharedfp_module_init) { /* * query did not return any action which can be used */ opal_output_verbose(10, ompi_sharedfp_base_framework.framework_output, "select: query returned failure"); } else { opal_output_verbose(10, ompi_sharedfp_base_framework.framework_output, "select: query returned priority %d", priority); /* * is this the best component we have found till now? */ if (priority > best_priority) { best_priority = priority; best_component = component; } om = OBJ_NEW(queried_module_t); /* * check if we have run out of space */ if (NULL == om) { OBJ_DESTRUCT(&queried); return OMPI_ERR_OUT_OF_RESOURCE; } om->om_component = component; om->om_module = module; opal_list_append(&queried, (opal_list_item_t *)om); } /* end else of if (NULL == module) */ } /* end else of if (NULL == component->sharedfpm_init) */ } /* end for ... end of traversal */ /* * Now we have alist of components which successfully returned * their module struct. One of these components has the best * priority. The rest have to be comm_unqueried to counter the * effects of file_query'ing them. Finalize happens only on * components which should are initialized. */ if (NULL == best_component) { /* * This typically means that there was no component which was * able to run properly this time. So, we need to abort */ OBJ_DESTRUCT(&queried); return OMPI_ERROR; } /* * We now have a list of components which have successfully * returned their priorities from the query. We now have to * unquery() those components which have not been selected and * init() the component which was selected */ for (item = opal_list_remove_first(&queried); NULL != item; item = opal_list_remove_first(&queried)) { om = (queried_module_t *) item; if (om->om_component == best_component) { /* * this is the chosen component, we have to initialise the * module of this component. * * ANJU: a component might not have all the functions * defined. Whereever a function pointer is null in the * module structure we need to fill it in with the base * structure function pointers. This is yet to be done */ /* * We don return here coz we still need to go through and * elease the other objects */ /*fill_null_pointers (om->om_module);*/ file->f_sharedfp = om->om_module; err = om->om_module->sharedfp_module_init(file); file->f_sharedfp_component = (mca_base_component_t *)best_component; } else { /* * this is not the "choosen one", finalize */ if (NULL != om->om_component->sharedfpm_file_unquery) { /* unquery the component only if they have some clean * up job to do. Components which are queried but do * not actually do anything typically do not have a * unquery. Hence this check is necessary */ (void) om->om_component->sharedfpm_file_unquery(file); opal_output_verbose(10, ompi_sharedfp_base_framework.framework_output, "select: component %s is not selected", om->om_component->sharedfpm_version.mca_component_name); } /* end if */ } /* if not best component */ OBJ_RELEASE(om); } /* traversing through the entire list */ opal_output_verbose(10, ompi_sharedfp_base_framework.framework_output, "select: component %s selected", best_component->sharedfpm_version.mca_component_name); OBJ_DESTRUCT(&queried); return err; }