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