/* * Copyright (c) 2004-2007 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 Evergrid, Inc. All rights reserved. * * $COPYRIGHT$ * * Additional copyrights may follow * * $HEADER$ */ /** * @file * * Checkpoint and Restart Service (CRS) Interface * * General Description: * * The OPAL Checkpoint and Restart Service (CRS) has been created to create an * abstract notion of a single process checkpointer for upper levels to * incorporate checkpoint/restart calls genericly into their code. This keeps * the upper levels from becoming too tied to a specfic checkpoint and restart * implementation. * * This interface will change in the future to allow for some additional * specialized functionality such as memory inclusion/exclusion, explicit * restarting while running, and others. * * Words to the Wise: * * The CRS module must adhere to the API exactly inorder to be fully supported. * How the module goes about conforming to the API is an internal module issue * and in no cases should the module impose restrictions upon the upper layers * as this is an API violation. * */ #ifndef MCA_CRS_H #define MCA_CRS_H #include "opal_config.h" #include "opal/mca/mca.h" #include "opal/mca/base/base.h" #include "opal/class/opal_object.h" #if defined(c_plusplus) || defined(__cplusplus) extern "C" { #endif /** * States of the module */ enum opal_crs_state_type_t { OPAL_CRS_CHECKPOINT, OPAL_CRS_RESTART, OPAL_CRS_CONTINUE, OPAL_CRS_TERM, OPAL_CRS_RUNNING, OPAL_CRS_ERROR }; typedef enum opal_crs_state_type_t opal_crs_state_type_t; /** * Structure for Single process snapshot * Each component is assumed to have extened this definition * in the same way they exten the opal_crs_base_compoinent_t below. */ struct opal_crs_base_snapshot_1_0_0_t { /** This is an object, so must have super */ opal_list_item_t super; /** MCA Component name */ char * component_name; /** Unique name of snapshot */ char * reference_name; /** Absolute path the the snapshot directory */ char * local_location; char * remote_location; /** Cold Start: * If we are restarting cold, then we need to recreate this structure * opal_restart would set this, and let the component do the heavy lifting * of recreating the structure, sicne it doesn't know exactly how to. */ bool cold_start; }; typedef struct opal_crs_base_snapshot_1_0_0_t opal_crs_base_snapshot_1_0_0_t; typedef struct opal_crs_base_snapshot_1_0_0_t opal_crs_base_snapshot_t; OPAL_DECLSPEC OBJ_CLASS_DECLARATION(opal_crs_base_snapshot_t); /** * Query function for CRS components. * Returns a priority to rank it agaianst other available CRS components. */ typedef struct opal_crs_base_module_1_0_0_t * (*opal_crs_base_component_query_1_0_0_fn_t) (int *priority); /** * Module initialization function. * Returns OPAL_SUCCESS */ typedef int (*opal_crs_base_module_init_fn_t) (void); /** * Module finalization function. * Returns OPAL_SUCCESS */ typedef int (*opal_crs_base_module_finalize_fn_t) (void); /** * Call the underlying checkpointer. * Returns OPAL_SUCCESS upon success, and OPAL_ERROR otherwise. * * Arguments: * pid = PID of the process to checkpoint, or 0 if checkpointing self. * fname = the filename where the checkpoint has been written. * state = The state at which the checkpoint is exiting * - OPAL_CRS_CONTINUE * Continuing after a checkpoint has been taken * - OPAL_CRS_RESTART * Restarting from a checkpoint * - OPAL_CRS_ERROR * Checkpoint was not successful. * * The 'fname' string is owned by the caller: if appropriate, it must be eventually * freed by the caller. */ typedef int (*opal_crs_base_module_checkpoint_fn_t) (pid_t pid, opal_crs_base_snapshot_t *snapshot, opal_crs_state_type_t *state); /** * Call the underlying restart command for this process * Returns OPAL_SUCCESS or OPAL_CRS_ERROR * * Arguments: * fname = Checkpoint filename * spawn_child = true if the restarted process should be forked as a new process, * in which case 'child_pid' will be returned. * false if the restarted process should overwrite the current * process space. * child_pid = PID of the child that was started, if applicable * */ typedef int (*opal_crs_base_module_restart_fn_t) (opal_crs_base_snapshot_t *snapshot, bool spawn_child, pid_t *child_pid); /** * Disable the checkpointer * Returns OPAL_SUCCESS or OPAL_CRS_ERROR * * This should set a flag/mutex to disallow checkpoints to occur. * If a checkpoint were to occur while checkpoints are disabled, * they should block until reenabled. * A quality module implementation would notify the user that the * checkpoint has been delayed until the program is out of this critical * section of code. */ typedef int (*opal_crs_base_module_disable_checkpoint_fn_t) (void); /** * Enable the checkpointer * Returns OPAL_SUCCESS or OPAL_CRS_ERROR * * This should set a flag/mutex to allow checkpoints to occur */ typedef int (*opal_crs_base_module_enable_checkpoint_fn_t) (void); /** * Prepare the CRS component for process launch. * Some CRS components need to take action before the * process is ever launched to do such things as: * - seed the process environment * - LD_PRELOAD * - Analyze the binary before launch * * @param rank Rank of the process to be started * @param app Absolute pathname of argv[0] * @param argv Standard argv-style array, including a final NULL pointer * @param env Standard environ-style array, including a final NULL pointer */ typedef int (*opal_crs_base_module_prelaunch_fn_t) (int32_t rank, char *base_snapshot_dir, char **app, char **cwd, char ***argv, char ***env); /** * Register another thread that may call this library. * Some CR systems require that each thread that will call into their library * register individually before doing so. * * Returns OPAL_SUCCESS or OPAL_ERROR */ typedef int (*opal_crs_base_module_reg_thread_fn_t) (void); /** * Structure for CRS v1.0.0 components. */ struct opal_crs_base_component_1_0_0_t { /** MCA base component */ mca_base_component_t crs_version; /** MCA base data */ mca_base_component_data_1_0_0_t crs_data; /** Component Query for Selection Function */ opal_crs_base_component_query_1_0_0_fn_t crs_query; /** Verbosity Level */ int verbose; /** Output Handle for opal_output */ int output_handle; /** Default Priority */ int priority; }; typedef struct opal_crs_base_component_1_0_0_t opal_crs_base_component_1_0_0_t; typedef struct opal_crs_base_component_1_0_0_t opal_crs_base_component_t; /** * Structure for CRS v1.0.0 modules */ struct opal_crs_base_module_1_0_0_t { /** Initialization Function */ opal_crs_base_module_init_fn_t crs_init; /** Finalization Function */ opal_crs_base_module_finalize_fn_t crs_finalize; /** Checkpoint interface */ opal_crs_base_module_checkpoint_fn_t crs_checkpoint; /** Restart Interface */ opal_crs_base_module_restart_fn_t crs_restart; /** Disable checkpoints */ opal_crs_base_module_disable_checkpoint_fn_t crs_disable_checkpoint; /** Enable checkpoints */ opal_crs_base_module_enable_checkpoint_fn_t crs_enable_checkpoint; /** Pre Launch */ opal_crs_base_module_prelaunch_fn_t crs_prelaunch; /** Per thread registration */ opal_crs_base_module_reg_thread_fn_t crs_reg_thread; }; typedef struct opal_crs_base_module_1_0_0_t opal_crs_base_module_1_0_0_t; typedef struct opal_crs_base_module_1_0_0_t opal_crs_base_module_t; OPAL_DECLSPEC extern opal_crs_base_module_t opal_crs; /** * Macro for use in components that are of type CRS v1.0.0 */ #define OPAL_CRS_BASE_VERSION_1_0_0 \ /* CRS v1.0 is chained to MCA v1.0 */ \ MCA_BASE_VERSION_1_0_0, \ /* CRS v1.0 */ \ "crs", 1, 0, 0 #if defined(c_plusplus) || defined(__cplusplus) } #endif #endif /* OPAL_CRS_H */