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Diffstat (limited to 'ACE/ace/Sbrk_Memory_Pool.h')
-rw-r--r-- | ACE/ace/Sbrk_Memory_Pool.h | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/ACE/ace/Sbrk_Memory_Pool.h b/ACE/ace/Sbrk_Memory_Pool.h new file mode 100644 index 00000000000..092099e9e34 --- /dev/null +++ b/ACE/ace/Sbrk_Memory_Pool.h @@ -0,0 +1,118 @@ +// -*- 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 */ |