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118 lines
3.2 KiB
C++
118 lines
3.2 KiB
C++
// -*- C++ -*-
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//=============================================================================
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/**
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* @file Sbrk_Memory_Pool.h
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*
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* $Id: Sbrk_Memory_Pool.h 80826 2008-03-04 14:51:23Z wotte $
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*
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* @author Dougls C. Schmidt <schmidt@cs.wustl.edu>
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* @author Prashant Jain <pjain@cs.wustl.edu>
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*/
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//=============================================================================
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#ifndef ACE_SBRK_MEMORY_POOL_H
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#define ACE_SBRK_MEMORY_POOL_H
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#include /**/ "ace/pre.h"
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#include /**/ "ace/ACE_export.h"
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#if !defined (ACE_LACKS_PRAGMA_ONCE)
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# pragma once
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#endif /* ACE_LACKS_PRAGMA_ONCE */
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#if !defined (ACE_LACKS_SBRK)
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#include "ace/ACE.h"
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#include "ace/os_include/sys/os_mman.h"
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ACE_BEGIN_VERSIONED_NAMESPACE_DECL
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/**
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* @class ACE_Sbrk_Memory_Pool_Options
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*
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* @brief Helper class for Sbrk Memory Pool constructor options.
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*
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* This should be a nested class, but that breaks too many
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* compilers.
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*/
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class ACE_Export ACE_Sbrk_Memory_Pool_Options
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{
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};
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/**
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* @class ACE_Sbrk_Memory_Pool
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*
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* @brief Make a memory pool that is based on <sbrk(2)>.
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*/
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class ACE_Export ACE_Sbrk_Memory_Pool
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{
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public:
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typedef ACE_Sbrk_Memory_Pool_Options OPTIONS;
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/// Initialize the pool.
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ACE_Sbrk_Memory_Pool (const ACE_TCHAR *backing_store_name = 0,
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const OPTIONS *options = 0);
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virtual ~ACE_Sbrk_Memory_Pool (void);
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// = Implementor operations.
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/// Ask system for initial chunk of local memory.
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virtual void *init_acquire (size_t nbytes,
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size_t &rounded_bytes,
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int &first_time);
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/// Acquire at least @a nbytes from the memory pool. @a rounded_bytes is
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/// the actual number of bytes allocated.
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virtual void *acquire (size_t nbytes,
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size_t &rounded_bytes);
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/// Instruct the memory pool to release all of its resources.
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virtual int release (int destroy = 1);
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/**
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* Sync @a len bytes of the memory region to the backing store
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* starting at @c this->base_addr_. If @a len == -1 then sync the
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* whole region.
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*/
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virtual int sync (ssize_t len = -1, int flags = MS_SYNC);
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/// Sync @a len bytes of the memory region to the backing store
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/// starting at @a addr.
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virtual int sync (void *addr, size_t len, int flags = MS_SYNC);
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/**
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* Change the protection of the pages of the mapped region to @a prot
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* starting at @c this->base_addr_ up to @a len bytes. If @a len == -1
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* then change protection of all pages in the mapped region.
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*/
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virtual int protect (ssize_t len = -1, int prot = PROT_RDWR);
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/// Change the protection of the pages of the mapped region to @a prot
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/// starting at @a addr up to @a len bytes.
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virtual int protect (void *addr, size_t len, int prot = PROT_RDWR);
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/// Dump the state of an object.
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virtual void dump (void) const;
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/// Return the base address of this memory pool, 0 if base_addr
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/// never changes.
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virtual void *base_addr (void) const;
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/// Declare the dynamic allocation hooks.
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ACE_ALLOC_HOOK_DECLARE;
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protected:
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/// Implement the algorithm for rounding up the request to an
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/// appropriate chunksize.
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virtual size_t round_up (size_t nbytes);
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};
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ACE_END_VERSIONED_NAMESPACE_DECL
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#endif /* !ACE_LACKS_SBRK */
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#include /**/ "ace/post.h"
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#endif /* ACE_SBRK_MEMORY_POOL_H */
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