alloc.so

berkeley db 4.6.21的源码。berkeley db是一个简单的数据库管理系统

m4_comment([$Id: alloc.so,v 1.12 2004/08/13 03:39:00 bostic Exp $])

m4_ref_title(Upgrading m4_db Applications,
    [Release 3.3: DB-__GT__set_malloc, DB-__GT__set_realloc],,
    upgrade.3.3/getswap, upgrade.3.3/conflict)

m4_p([dnl
There are two new methods in the m4_db 3.3 release:
m4_ref(dbenv_set_alloc) and m4_ref(dbh_set_alloc).  These functions
allow applications to specify a set of allocation functions for the
m4_db library to use when allocating memory to be owned by the
application and when freeing memory that was originally allocated by the
application.])

m4_p([dnl
The new methods affect or replace the following historic methods:])

m4_tagbegin
m4_tag(DB-__GT__set_malloc, [dnl
The DB-__GT__set_malloc method has been replaced in its entirety.
Applications using this method should replace the call with a call
to m4_ref(dbh_set_alloc).])
m4_tag(DB-__GT__set_realloc, [dnl
The DB-__GT__set_realloc method has been replaced in its entirety.
Applications using this method should replace the call with a call
to m4_ref(dbh_set_alloc).])
m4_tag(m4_ref(dbh_stat), [dnl
The historic m4_arg(db_malloc) argument to the m4_refT(dbh_stat) has
been replaced.  Applications using this method should do as follows:
if the argument is NULL, it should simply be removed.  If non-NULL,
it should be replaced with a call to m4_ref(dbh_set_alloc).])
m4_tag(lock_stat, [dnl
The historic m4_arg(db_malloc) argument to the lock_stat function has
been replaced.  Applications using this function should do as follows:
if the argument is NULL, it should simply be removed.  If
non-NULL, it should be replaced with a call to m4_ref(dbenv_set_alloc).])
m4_tag(log_archive, [dnl
The historic m4_arg(db_malloc) argument to the log_archive function has
been replaced.  Applications using this function should do as follows:
if the argument is NULL, it should simply be removed.  If non-NULL,
it should be replaced with a call to m4_ref(dbenv_set_alloc).])
m4_tag(log_stat, [dnl
The historic m4_arg(db_malloc) argument to the log_stat function has
been replaced.  Applications using this function should do as follows:
if the argument is NULL, it should simply be removed.  If non-NULL,
it should be replaced with a call to m4_ref(dbenv_set_alloc).])
m4_tag(memp_stat, [dnl
The historic m4_arg(db_malloc) argument to the memp_stat function has
been replaced.  Applications using this function should do as follows:
if the argument is NULL, it should simply be removed.  If non-NULL,
it should be replaced with a call to m4_ref(dbenv_set_alloc).])
m4_tag(txn_stat, [dnl
The historic m4_arg(db_malloc) argument to the txn_stat function has
been replaced.  Applications using this function should do as follows:
if the argument is NULL, it should simply be removed.  If non-NULL,
it should be replaced with a call to m4_ref(dbenv_set_alloc).])
m4_tagend

m4_p([dnl
One potential incompatibility for historic applications is that the
allocation functions for a database environment must now be set before
the environment is opened.  Historically, m4_db applications could open
the environment first, and subsequently call the DB-__GT__set_malloc
and DB-__GT__set_realloc methods; that use is no longer supported.])

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