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    The following form allows you to view linux man pages.

    Command:

    mpool

    
    
    

    SYNOPSIS

           #include <db.h>
           #include <mpool.h>
    
           MPOOL *mpool_open(DBT *key, int fd, pgno_t pagesize, pgno_t maxcache);
    
           void mpool_filter(MPOOL *mp, void (*pgin)(void *, pgno_t, void *),
                             void (*pgout)(void *, pgno_t, void *),
                             void *pgcookie);
    
           void *mpool_new(MPOOL *mp, pgno_t *pgnoaddr);
    
           void *mpool_get(MPOOL *mp, pgno_t pgno, unsigned int flags);
    
           int mpool_put(MPOOL *mp, void *pgaddr, unsigned int flags);
    
           int mpool_sync(MPOOL *mp);
    
           int mpool_close(MPOOL *mp);
    
    
    

    DESCRIPTION

           Note  well:  This  page documents interfaces provided in glibc up until
           version 2.1.  Since version 2.2, glibc no longer provides these  inter-
           faces.   Probably,  you  are looking for the APIs provided by the libdb
           library instead.
    
           Mpool is the library interface intended to provide page oriented buffer
           management of files.  The buffers may be shared between processes.
    
           The  function mpool_open() initializes a memory pool.  The key argument
           is the byte string used to negotiate between multiple processes wishing
           to share buffers.  If the file buffers are mapped in shared memory, all
           processes using the same key will share the buffers.  If key  is  NULL,
           the  buffers are mapped into private memory.  The fd argument is a file
           descriptor for the underlying file, which must be seekable.  If key  is
           non-NULL  and  matches  a file already being mapped, the fd argument is
           ignored.
    
           The pagesize argument is the size, in bytes, of the  pages  into  which
           the  file is broken up.  The maxcache argument is the maximum number of
           pages from the underlying file to cache at any one time.  This value is
           not  relative  to the number of processes which share a file's buffers,
           but will be the largest value specified by any of the processes sharing
           the file.
    
           The  mpool_filter()  function is intended to make transparent input and
           output processing of the pages possible.  If the pgin function is spec-
           ified,  it  is  called  each time a buffer is read into the memory pool
           from the backing file.  If the  pgout  function  is  specified,  it  is
           called each time a buffer is written into the backing file.  Both func-
           tions are called with the pgcookie  pointer,  the  page  number  and  a
           pointer to the page to being read or written.
    
           MPOOL_DIRTY
                  The  page has been modified and needs to be written to the back-
                  ing file.
    
           mpool_put() returns 0 on success and -1 if an error occurs.
    
           The function mpool_sync() writes all modified pages associated with the
           MPOOL  pointer  to the backing file.  mpool_sync() returns 0 on success
           and -1 if an error occurs.
    
           The mpool_close() function free's up any  allocated  memory  associated
           with  the  memory  pool  cookie.  Modified pages are not written to the
           backing file.  mpool_close() returns 0 on success and -1  if  an  error
           occurs.
    
    
    

    ERRORS

           The  mpool_open() function may fail and set errno for any of the errors
           specified for the library routine malloc(3).
    
           The mpool_get() function may fail and set errno for the following:
    
           EINVAL         The requested record doesn't exist.
    
           The mpool_new() and mpool_get() functions may fail and  set  errno  for
           any of the errors specified for the library routines read(2), write(2),
           and malloc(3).
    
           The mpool_sync() function may fail and set errno for any of the  errors
           specified for the library routine write(2).
    
           The mpool_close() function may fail and set errno for any of the errors
           specified for the library routine free(3).
    
    
    

    CONFORMING TO

           Not in POSIX.1-2001.  Present on the BSDs.
    
    
    

    SEE ALSO

           btree(3), dbopen(3), hash(3), recno(3)
    
    
    

    4.4 Berkeley Distribution 2012-04-26 MPOOL(3)

    
    
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