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Edit File : apr_mmap.h \| Size : 5.01 KB
/* Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. * The ASF licenses this file to You under the Apache License, Version 2.0 * (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. / #ifndef APR_MMAP_H #define APR_MMAP_H /* * @file apr_mmap.h * @brief APR MMAP routines / #include "apr.h" #include "apr_pools.h" #include "apr_errno.h" #include "apr_ring.h" #include "apr_file_io.h" / for apr_file_t / #ifdef BEOS #include <kernel/OS.h> #endif #ifdef __cplusplus extern "C" { #endif / __cplusplus / /* * @defgroup apr_mmap MMAP (Memory Map) Routines * @ingroup APR * @{ / /* MMap opened for reading / #define APR_MMAP_READ 1 /* MMap opened for writing / #define APR_MMAP_WRITE 2 /* @see apr_mmap_t / typedef struct apr_mmap_t apr_mmap_t; /* * @remark * As far as I can tell the only really sane way to store an MMAP is as a * void * and a length. BeOS requires this area_id, but that's just a little * something extra. I am exposing this type, because it doesn't make much * sense to keep it private, and opening it up makes some stuff easier in * Apache. / /* The MMAP structure / struct apr_mmap_t { /* The pool the mmap structure was allocated out of. / apr_pool_t cntxt; #ifdef BEOS /** An area ID. Only valid on BeOS / area_id area; #endif #ifdef WIN32 /* The handle of the file mapping / HANDLE mhandle; /* The start of the real memory page area (mapped view) / void mv; /** The physical start, size and offset / apr_off_t pstart; apr_size_t psize; apr_off_t poffset; #endif /* The start of the memory mapped area / void mm; /** The amount of data in the mmap / apr_size_t size; /* ring of apr_mmap_t's that reference the same * mmap'ed region; acts in place of a reference count / APR_RING_ENTRY(apr_mmap_t) link; }; #if APR_HAS_MMAP \|\| defined(DOXYGEN) /* @def APR_MMAP_THRESHOLD * Files have to be at least this big before they're mmap()d. This is to deal * with systems where the expense of doing an mmap() and an munmap() outweighs * the benefit for small files. It shouldn't be set lower than 1. / #ifdef MMAP_THRESHOLD # define APR_MMAP_THRESHOLD MMAP_THRESHOLD #else # ifdef SUNOS4 # define APR_MMAP_THRESHOLD (81024) # else # define APR_MMAP_THRESHOLD 1 # endif /* SUNOS4 / #endif / MMAP_THRESHOLD / /* @def APR_MMAP_LIMIT * Maximum size of MMap region / #ifdef MMAP_LIMIT # define APR_MMAP_LIMIT MMAP_LIMIT #else # define APR_MMAP_LIMIT (410241024) #endif / MMAP_LIMIT / /* Can this file be MMaped / #define APR_MMAP_CANDIDATE(filelength) \ ((filelength >= APR_MMAP_THRESHOLD) && (filelength < APR_MMAP_LIMIT)) / Function definitions / /* * Create a new mmap'ed file out of an existing APR file. * @param newmmap The newly created mmap'ed file. * @param file The file to turn into an mmap. * @param offset The offset into the file to start the data pointer at. * @param size The size of the file * @param flag bit-wise or of: * <PRE> * APR_MMAP_READ MMap opened for reading * APR_MMAP_WRITE MMap opened for writing * </PRE> * @param cntxt The pool to use when creating the mmap. / APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t newmmap, apr_file_t file, apr_off_t offset, apr_size_t size, apr_int32_t flag, apr_pool_t cntxt); /* * Duplicate the specified MMAP. * @param new_mmap The structure to duplicate into. * @param old_mmap The mmap to duplicate. * @param p The pool to use for new_mmap. / APR_DECLARE(apr_status_t) apr_mmap_dup(apr_mmap_t new_mmap, apr_mmap_t old_mmap, apr_pool_t p); /* * Remove a mmap'ed. * @param mm The mmap'ed file. / APR_DECLARE(apr_status_t) apr_mmap_delete(apr_mmap_t mm); /** * Move the pointer into the mmap'ed file to the specified offset. * @param addr The pointer to the offset specified. * @param mm The mmap'ed file. * @param offset The offset to move to. / APR_DECLARE(apr_status_t) apr_mmap_offset(void addr, apr_mmap_t mm, apr_off_t offset); #endif /* APR_HAS_MMAP / /* @} / #ifdef __cplusplus } #endif #endif / ! APR_MMAP_H */ Back

Edit File : apr_mmap.h | Size : 5.01 KB

/* Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef APR_MMAP_H
#define APR_MMAP_H

/**
 * @file apr_mmap.h
 * @brief APR MMAP routines
 */

#include "apr.h"
#include "apr_pools.h"
#include "apr_errno.h"
#include "apr_ring.h"
#include "apr_file_io.h"        /* for apr_file_t */

#ifdef BEOS
#include <kernel/OS.h>
#endif

#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

/**
 * @defgroup apr_mmap MMAP (Memory Map) Routines
 * @ingroup APR 
 * @{
 */

/** MMap opened for reading */
#define APR_MMAP_READ    1
/** MMap opened for writing */
#define APR_MMAP_WRITE   2

/** @see apr_mmap_t */
typedef struct apr_mmap_t            apr_mmap_t;

/**
 * @remark
 * As far as I can tell the only really sane way to store an MMAP is as a
 * void * and a length.  BeOS requires this area_id, but that's just a little
 * something extra.  I am exposing this type, because it doesn't make much
 * sense to keep it private, and opening it up makes some stuff easier in
 * Apache.
 */
/** The MMAP structure */
struct apr_mmap_t {
    /** The pool the mmap structure was allocated out of. */
    apr_pool_t *cntxt;
#ifdef BEOS
    /** An area ID.  Only valid on BeOS */
    area_id area;
#endif
#ifdef WIN32
    /** The handle of the file mapping */
    HANDLE mhandle;
    /** The start of the real memory page area (mapped view) */
    void *mv;
    /** The physical start, size and offset */
    apr_off_t  pstart;
    apr_size_t psize;
    apr_off_t  poffset;
#endif
    /** The start of the memory mapped area */
    void *mm;
    /** The amount of data in the mmap */
    apr_size_t size;
    /** ring of apr_mmap_t's that reference the same
     * mmap'ed region; acts in place of a reference count */
    APR_RING_ENTRY(apr_mmap_t) link;
};

#if APR_HAS_MMAP || defined(DOXYGEN)

/** @def APR_MMAP_THRESHOLD 
 * Files have to be at least this big before they're mmap()d.  This is to deal
 * with systems where the expense of doing an mmap() and an munmap() outweighs
 * the benefit for small files.  It shouldn't be set lower than 1.
 */
#ifdef MMAP_THRESHOLD
#  define APR_MMAP_THRESHOLD              MMAP_THRESHOLD
#else
#  ifdef SUNOS4
#    define APR_MMAP_THRESHOLD            (8*1024)
#  else
#    define APR_MMAP_THRESHOLD            1
#  endif /* SUNOS4 */
#endif /* MMAP_THRESHOLD */

/** @def APR_MMAP_LIMIT
 * Maximum size of MMap region
 */
#ifdef MMAP_LIMIT
#  define APR_MMAP_LIMIT                  MMAP_LIMIT
#else
#  define APR_MMAP_LIMIT                  (4*1024*1024)
#endif /* MMAP_LIMIT */

/** Can this file be MMaped */
#define APR_MMAP_CANDIDATE(filelength) \
    ((filelength >= APR_MMAP_THRESHOLD) && (filelength < APR_MMAP_LIMIT))

/*   Function definitions */

/** 
 * Create a new mmap'ed file out of an existing APR file.
 * @param newmmap The newly created mmap'ed file.
 * @param file The file to turn into an mmap.
 * @param offset The offset into the file to start the data pointer at.
 * @param size The size of the file
 * @param flag bit-wise or of:
 * <PRE>
 *          APR_MMAP_READ       MMap opened for reading
 *          APR_MMAP_WRITE      MMap opened for writing
 * </PRE>
 * @param cntxt The pool to use when creating the mmap.
 */
APR_DECLARE(apr_status_t) apr_mmap_create(apr_mmap_t **newmmap, 
                                          apr_file_t *file, apr_off_t offset,
                                          apr_size_t size, apr_int32_t flag,
                                          apr_pool_t *cntxt);

/**
 * Duplicate the specified MMAP.
 * @param new_mmap The structure to duplicate into. 
 * @param old_mmap The mmap to duplicate.
 * @param p The pool to use for new_mmap.
 */         
APR_DECLARE(apr_status_t) apr_mmap_dup(apr_mmap_t **new_mmap,
                                       apr_mmap_t *old_mmap,
                                       apr_pool_t *p);

/**
 * Remove a mmap'ed.
 * @param mm The mmap'ed file.
 */
APR_DECLARE(apr_status_t) apr_mmap_delete(apr_mmap_t *mm);

/** 
 * Move the pointer into the mmap'ed file to the specified offset.
 * @param addr The pointer to the offset specified.
 * @param mm The mmap'ed file.
 * @param offset The offset to move to.
 */
APR_DECLARE(apr_status_t) apr_mmap_offset(void **addr, apr_mmap_t *mm, 
                                          apr_off_t offset);

#endif /* APR_HAS_MMAP */

/** @} */

#ifdef __cplusplus
}
#endif

#endif  /* ! APR_MMAP_H */

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