/*
* 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 */