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openmpi/oshmem/request/request.h

442 строки
16 KiB
C

/* -*- Mode: C; c-basic-offset:4 ; -*- */
/*
* Copyright (c) 2013 Mellanox Technologies, Inc.
* All rights reserved.
* $COPYRIGHT$
*
* Additional copyrights may follow
*
* $HEADER$
*/
/**
* @file
*
* Top-level description of requests
*/
#ifndef OSHMEM_REQUEST_H
#define OSHMEM_REQUEST_H
#include "oshmem_config.h"
#include "oshmem/constants.h"
#include "ompi/class/ompi_free_list.h"
#include "opal/class/opal_pointer_array.h"
#include "opal/threads/condition.h"
BEGIN_C_DECLS
/**
* Request class
*/
/*OSHMEM_DECLSPEC OBJ_CLASS_DECLARATION(oshmem_request_t);*/
OSHMEM_DECLSPEC OBJ_CLASS_DECLARATION(oshmem_request_t);
/*
* The following include pulls in shared typedefs with debugger plugins.
* For more information on why we do this see the Notice to developers
* comment at the top of the oshmem_msgq_dll.c file.
*/
#include "request_dbg.h"
struct oshmem_request_t;
typedef struct oshmem_request_t *SHMEM_Request;
typedef struct oshmem_status_public_t SHMEM_Status;
/* This constants are used to check status of request->req_status.SHMEM_ERROR */
#define SHMEM_SUCCESS 0
#define SHMEM_ERR_IN_STATUS 18
/*
* SHMEM_Status
*/
struct oshmem_status_public_t {
int SHMEM_SOURCE;
/*int MPI_TAG;*/
int SHMEM_ERROR;
int _count;
int _cancelled;
};
typedef struct oshmem_status_public_t oshmem_status_public_t;
typedef int (SHMEM_Grequest_query_function)(void *, SHMEM_Status *);
typedef int (SHMEM_Grequest_free_function)(void *);
typedef int (SHMEM_Grequest_cancel_function)(void *, int);
#define SHMEM_REQUEST_NULL OSHMEM_PREDEFINED_GLOBAL(SHMEM_Request, oshmem_request_null)
/*
* Required function to free the request and any associated resources.
*/
typedef int (*oshmem_request_free_fn_t)(struct oshmem_request_t** rptr);
/*
* Optional function to cancel a pending request.
*/
typedef int (*oshmem_request_cancel_fn_t)(struct oshmem_request_t* request,
int flag);
/*
* Optional function called when the request is completed from the SHMEM
* library perspective. This function is not allowed to release any
* ressources related to the request.
*/
typedef int (*oshmem_request_complete_fn_t)(struct oshmem_request_t* request);
/* TODO: decide whether to remove comm */
/**
* Forward declaration
*/
struct oshmem_group_t;
/**
* Forward declaration
*/
/*struct oshmem_file_t;*/
/**
* Union for holding several different SHMEM pointer types on the request
*/
typedef union oshmem_shmem_object_t {
struct oshmem_group_t *comm;
/* struct oshmem_file_t *file;*/
} oshmem_shmem_object_t;
/**
* Main top-level request struct definition
*/
struct oshmem_request_t {
ompi_free_list_item_t super; /**< Base type *//*TODO: Implement in shmem */
oshmem_request_type_t req_type; /**< Enum indicating the type of the request */
oshmem_status_public_t req_status; /**< Completion status */
volatile bool req_complete; /**< Flag indicating completion on a request */
volatile oshmem_request_state_t req_state; /**< enum indicate the state of the request */
bool req_persistent; /* TODO: NOT Required */
/**< flag indicating if this is a persistent request */
int req_f_to_c_index; /* TODO: NOT Required */
/**< Index in Fortran <-> C translation array */
oshmem_request_free_fn_t req_free; /**< Called by free */
oshmem_request_cancel_fn_t req_cancel; /* TODO: Not Required */
/**< Optional function to cancel the request */
oshmem_request_complete_fn_t req_complete_cb; /**< Called when the request is SHMEM completed */
void *req_complete_cb_data;
oshmem_shmem_object_t req_shmem_object; /**< Pointer to SHMEM object that created this request */
};
/**
* Convenience typedef
*/
typedef struct oshmem_request_t oshmem_request_t;
/**
* Padded struct to maintain back compatibiltiy.
* See oshmem/communicator/communicator.h comments with struct oshmem_group_t
* for full explanation why we chose the following padding construct for predefines.
*/
#define PREDEFINED_REQUEST_PAD (sizeof(void*) * 32)
struct oshmem_predefined_request_t {
struct oshmem_request_t request;
char padding[PREDEFINED_REQUEST_PAD - sizeof(oshmem_request_t)];
};
typedef struct oshmem_predefined_request_t oshmem_predefined_request_t;
/**
* Initialize a request. This is a macro to avoid function call
* overhead, since this is typically invoked in the critical
* performance path (since requests may be re-used, it is possible
* that we will have to initialize a request multiple times).
*/
#define OSHMEM_REQUEST_INIT(request, persistent) \
do { \
(request)->req_complete = false; \
(request)->req_state = OSHMEM_REQUEST_INACTIVE; \
(request)->req_persistent = (persistent); \
} while (0);
/**
* Finalize a request. This is a macro to avoid function call
* overhead, since this is typically invoked in the critical
* performance path (since requests may be re-used, it is possible
* that we will have to finalize a request multiple times).
*
* When finalizing a request, if MPI_Request_f2c() was previously
* invoked on that request, then this request was added to the f2c
* table, and we need to remove it
*
* This function should be called only from the SHMEM layer. It should
* never be called from the SPML. It take care of the upper level clean-up.
* When the user call MPI_Request_free we should release all SHMEM level
* ressources, so we have to call this function too.
*/
#define OSHMEM_REQUEST_FINI(request) \
do { \
(request)->req_state = OSHMEM_REQUEST_INVALID; \
if (SHMEM_UNDEFINED != (request)->req_f_to_c_index) { \
opal_pointer_array_set_item(&oshmem_request_f_to_c_table, \
(request)->req_f_to_c_index, NULL); \
(request)->req_f_to_c_index = SHMEM_UNDEFINED; \
} \
} while (0);
/**
* Non-blocking test for request completion.
*
* @param request (IN) Array of requests
* @param complete (OUT) Flag indicating if index is valid (a request completed).
* @param status (OUT) Status of completed request.
* @return OSHMEM_SUCCESS or failure status.
*
* Note that upon completion, the request is freed, and the
* request handle at index set to NULL.
*/
typedef int (*oshmem_request_test_fn_t)(oshmem_request_t ** rptr,
int *completed,
oshmem_status_public_t * status);
/**
* Non-blocking test for request completion.
*
* @param count (IN) Number of requests
* @param request (IN) Array of requests
* @param index (OUT) Index of first completed request.
* @param complete (OUT) Flag indicating if index is valid (a request completed).
* @param status (OUT) Status of completed request.
* @return OSHMEM_SUCCESS or failure status.
*
* Note that upon completion, the request is freed, and the
* request handle at index set to NULL.
*/
typedef int (*oshmem_request_test_any_fn_t)(size_t count,
oshmem_request_t ** requests,
int *index,
int *completed,
oshmem_status_public_t * status);
/**
* Non-blocking test for request completion.
*
* @param count (IN) Number of requests
* @param requests (IN) Array of requests
* @param completed (OUT) Flag indicating wether all requests completed.
* @param statuses (OUT) Array of completion statuses.
* @return OSHMEM_SUCCESS or failure status.
*
* This routine returns completed==true if all requests have completed.
* The statuses parameter is only updated if all requests completed. Likewise,
* the requests array is not modified (no requests freed), unless all requests
* have completed.
*/
typedef int (*oshmem_request_test_all_fn_t)(size_t count,
oshmem_request_t ** requests,
int *completed,
oshmem_status_public_t * statuses);
/**
* Non-blocking test for some of N requests to complete.
*
* @param count (IN) Number of requests
* @param requests (INOUT) Array of requests
* @param outcount (OUT) Number of finished requests
* @param indices (OUT) Indices of the finished requests
* @param statuses (OUT) Array of completion statuses.
* @return OSHMEM_SUCCESS, OSHMEM_ERR_IN_STATUS or failure status.
*
*/
typedef int (*oshmem_request_test_some_fn_t)(size_t count,
oshmem_request_t ** requests,
int * outcount,
int * indices,
oshmem_status_public_t * statuses);
/**
* Wait (blocking-mode) for one requests to complete.
*
* @param request (IN) Pointer to request.
* @param status (OUT) Status of completed request.
* @return OSHMEM_SUCCESS or failure status.
*
*/
typedef int (*oshmem_request_wait_fn_t)(oshmem_request_t ** req_ptr,
oshmem_status_public_t * status);
/**
* Wait (blocking-mode) for one of N requests to complete.
*
* @param count (IN) Number of requests
* @param requests (IN) Array of requests
* @param index (OUT) Index into request array of completed request.
* @param status (OUT) Status of completed request.
* @return OSHMEM_SUCCESS or failure status.
*
*/
typedef int (*oshmem_request_wait_any_fn_t)(size_t count,
oshmem_request_t ** requests,
int *index,
oshmem_status_public_t * status);
/**
* Wait (blocking-mode) for all of N requests to complete.
*
* @param count (IN) Number of requests
* @param requests (IN) Array of requests
* @param statuses (OUT) Array of completion statuses.
* @return OSHMEM_SUCCESS or failure status.
*
*/
typedef int (*oshmem_request_wait_all_fn_t)(size_t count,
oshmem_request_t ** requests,
oshmem_status_public_t * statuses);
/**
* Wait (blocking-mode) for some of N requests to complete.
*
* @param count (IN) Number of requests
* @param requests (INOUT) Array of requests
* @param outcount (OUT) Number of finished requests
* @param indices (OUT) Indices of the finished requests
* @param statuses (OUT) Array of completion statuses.
* @return OSHMEM_SUCCESS, OSHMEM_ERR_IN_STATUS or failure status.
*
*/
typedef int (*oshmem_request_wait_some_fn_t)(size_t count,
oshmem_request_t ** requests,
int * outcount,
int * indices,
oshmem_status_public_t * statuses);
/**
* Replaceable request functions
*/
typedef struct oshmem_request_fns_t {
oshmem_request_test_fn_t req_test;
oshmem_request_test_any_fn_t req_test_any;
oshmem_request_test_all_fn_t req_test_all;
oshmem_request_test_some_fn_t req_test_some;
oshmem_request_wait_fn_t req_wait;
oshmem_request_wait_any_fn_t req_wait_any;
oshmem_request_wait_all_fn_t req_wait_all;
oshmem_request_wait_some_fn_t req_wait_some;
} oshmem_request_fns_t;
/**
* Globals used for tracking requests and request completion.
*/
OSHMEM_DECLSPEC extern opal_pointer_array_t oshmem_request_f_to_c_table;
OSHMEM_DECLSPEC extern size_t oshmem_request_waiting;
OSHMEM_DECLSPEC extern size_t oshmem_request_completed;
OSHMEM_DECLSPEC extern int32_t oshmem_request_poll;
OSHMEM_DECLSPEC extern opal_mutex_t oshmem_request_lock;
OSHMEM_DECLSPEC extern opal_condition_t oshmem_request_cond;
OSHMEM_DECLSPEC extern oshmem_predefined_request_t oshmem_request_null;
OSHMEM_DECLSPEC extern oshmem_request_t oshmem_request_empty;
OSHMEM_DECLSPEC extern oshmem_status_public_t oshmem_status_empty;
OSHMEM_DECLSPEC extern oshmem_request_fns_t oshmem_request_functions;
/**
* Initialize the OSHMEM_Request subsystem; invoked during SHMEM_INIT.
*/
int oshmem_request_init(void);
/**
* Free a persistent request to a MPI_PROC_NULL peer (there's no
* freelist to put it back to, so we have to actually OBJ_RELEASE it).
*/
OSHMEM_DECLSPEC int oshmem_request_persistent_proc_null_free(oshmem_request_t **request);
/**
* Shut down the SHMEM_Request subsystem; invoked during SHMEM_FINALIZE.
*/
int oshmem_request_finalize(void);
/**
* Cancel a pending request.
*/
static inline int oshmem_request_cancel(oshmem_request_t* request)
{
if (request->req_cancel != NULL ) {
return request->req_cancel(request, true);
}
return OSHMEM_SUCCESS;
}
/**
* Free a request.
*
* @param request (INOUT) Pointer to request.
*/
static inline int oshmem_request_free(oshmem_request_t** request)
{
return (*request)->req_free(request);
}
#define oshmem_request_test (oshmem_request_functions.req_test)
#define oshmem_request_test_any (oshmem_request_functions.req_test_any)
#define oshmem_request_test_all (oshmem_request_functions.req_test_all)
#define oshmem_request_test_some (oshmem_request_functions.req_test_some)
#define oshmem_request_wait (oshmem_request_functions.req_wait)
#define oshmem_request_wait_any (oshmem_request_functions.req_wait_any)
#define oshmem_request_wait_all (oshmem_request_functions.req_wait_all)
#define oshmem_request_wait_some (oshmem_request_functions.req_wait_some)
/**
* Wait for any completion. It is a caller responsibility to check for
* condition and call us again if needed.
*/
static inline void oshmem_request_wait_any_completion(void)
{
OPAL_THREAD_LOCK(&oshmem_request_lock);
oshmem_request_waiting++;
opal_condition_wait(&oshmem_request_cond, &oshmem_request_lock);
oshmem_request_waiting--;
OPAL_THREAD_UNLOCK(&oshmem_request_lock);
}
/**
* Wait a particular request for completion
*/
static inline void oshmem_request_wait_completion(oshmem_request_t *req)
{
if (false == req->req_complete) {
#if OMPI_ENABLE_PROGRESS_THREADS
if(opal_progress_spin(&req->req_complete)) {
return;
}
#endif
OPAL_THREAD_LOCK(&oshmem_request_lock);
oshmem_request_waiting++;
while (false == req->req_complete) {
opal_condition_wait(&oshmem_request_cond, &oshmem_request_lock);
}
oshmem_request_waiting--;
OPAL_THREAD_UNLOCK(&oshmem_request_lock);
}
}
/**
* Signal or mark a request as complete. If with_signal is true this will
* wake any thread pending on the request and oshmem_request_lock should be
* held while calling this function. If with_signal is false, there will
* signal generated, and no lock required. This is a special case when
* the function is called from the critical path for small messages, where
* we know the current execution flow created the request, and is still
* in the _START macro.
*/
static inline int oshmem_request_complete(oshmem_request_t* request,
bool with_signal)
{
if (NULL != request->req_complete_cb) {
request->req_complete_cb(request);
}
oshmem_request_completed++;
request->req_complete = true;
if (with_signal && oshmem_request_waiting) {
/* Broadcast the condition, otherwise if there is already a thread
* waiting on another request it can use all signals.
*/
opal_condition_broadcast(&oshmem_request_cond);
}
return OSHMEM_SUCCESS;
}
END_C_DECLS
#endif