159 строки
5.0 KiB
C
159 строки
5.0 KiB
C
/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2005 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* Copyright (c) 2009 Cisco Systems, Inc. All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#ifndef _COMMON_SM_MMAP_H_
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#define _COMMON_SM_MMAP_H_
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#include "ompi_config.h"
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#include "opal/class/opal_object.h"
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#include "opal/class/opal_list.h"
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#include "opal/sys/atomic.h"
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#include "ompi/mca/mpool/mpool.h"
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#include "ompi/proc/proc.h"
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#include "ompi/group/group.h"
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BEGIN_C_DECLS
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struct mca_mpool_base_module_t;
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typedef struct mca_common_sm_file_header_t {
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/* lock to control atomic access */
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opal_atomic_lock_t seg_lock;
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/* is the segment ready for use */
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volatile int32_t seg_inited;
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/* Offset to next available memory location available for allocation */
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size_t seg_offset;
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/* total size of the segment */
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size_t seg_size;
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} mca_common_sm_file_header_t;
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typedef struct mca_common_sm_mmap_t {
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/* double link list element */
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opal_list_item_t map_item;
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/* pointer to header embedded in the shared memory file */
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mca_common_sm_file_header_t *map_seg;
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/* base address of the mmap'ed file */
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unsigned char *map_addr;
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/* base address of data segment */
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unsigned char *data_addr;
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/* How big it is (in bytes) */
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size_t map_size;
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/* Filename */
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char map_path[OPAL_PATH_MAX];
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#if defined(__WINDOWS__)
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/* Handle to the object */
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HANDLE hMappedObject;
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#endif /* defined(__WINDOWS__) */
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} mca_common_sm_mmap_t;
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OBJ_CLASS_DECLARATION(mca_common_sm_mmap_t);
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/**
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* This routine is used to set up a shared memory file, backed
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* by a specified file. It is assumed that the file does not
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* exist before any of the current set of processes try and open
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* it.
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*
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* @param procs - array of (ompi_proc_t*)'s to create this shared
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* memory segment for. This array must be writable; it may be edited
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* (in undefined ways) if the array contains procs that are not on
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* this host. It is assumed that the caller will simply free this
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* array upon return. (INOUT)
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*
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* @param num_procs - length of the procs array (IN)
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*
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* @param size - size of the file, in bytes (IN)
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*
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* @param file_name name of file to be opened. (IN)
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*
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* @param size_ctl_structure size of the control structure at
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* the head of the file. The control structure
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* is assumed to have mca_common_sm_file_header_t
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* as its first segment (IN)
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*
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* @param data_set_alignment alignment of the data segment. this
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* follows the control structure. If this
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* value if 0, then assume that there will
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* be no data segment following the control
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* structure. (IN)
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*
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* @return value pointer to control structure at head of file.
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*/
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OMPI_DECLSPEC extern
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mca_common_sm_mmap_t* mca_common_sm_mmap_init(
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ompi_proc_t **procs,
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size_t num_procs,
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size_t size,
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char *file_name,
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size_t size_ctl_structure,
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size_t data_seg_alignment);
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/**
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* This routine is used to set up a shared memory file, backed
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* by a specified file. It is assumed that the file does not
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* exist before any of the current set of processes try and open
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* it.
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*
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* This routine is the same as mca_common_sm_mmap_init() except that
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* it takes an (ompi_group_t*) parameter to specify the peers rather
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* than an array of procs. Unlike mca_common_sm_mmap_init(), the
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* group must contain *only* local peers, or this function will return
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* NULL and not create any shared memory segment.
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*/
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OMPI_DECLSPEC extern
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mca_common_sm_mmap_t* mca_common_sm_mmap_init_group(
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ompi_group_t *group,
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size_t size,
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char *file_name,
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size_t size_ctl_structure,
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size_t data_seg_alignment);
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/*
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* Callback from the sm mpool
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*/
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OMPI_DECLSPEC extern
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void* mca_common_sm_mmap_seg_alloc(
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struct mca_mpool_base_module_t* mpool,
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size_t* size,
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mca_mpool_base_registration_t** registration);
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/**
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* This function will release all local resources attached to the
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* mmapped file. We assume that the operating system will destroy the
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* file when the last process release it.
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*
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* @param sm_mmap - the control structure at head of file.
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*
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* @returnvalue 0 if everything was OK, otherwise a negative value.
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*/
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OMPI_DECLSPEC extern
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int mca_common_sm_mmap_fini( mca_common_sm_mmap_t* sm_mmap );
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END_C_DECLS
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#endif
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