#include <Shared_Memory_Pool.h>
Classes | |
struct | SHM_TABLE |
Keeps track of all the segments being used. More... | |
Public Types | |
typedef ACE_Shared_Memory_Pool_Options | OPTIONS |
Public Member Functions | |
ACE_Shared_Memory_Pool (const ACE_TCHAR *backing_store_name=0, const OPTIONS *options=0) | |
Initialize the pool. | |
virtual | ~ACE_Shared_Memory_Pool (void) |
virtual void * | init_acquire (size_t nbytes, size_t &rounded_bytes, int &first_time) |
Ask system for initial chunk of local memory. | |
virtual void * | acquire (size_t nbytes, size_t &rounded_bytes) |
virtual int | release (int destroy=1) |
Instruct the memory pool to release all of its resources. | |
virtual int | sync (ssize_t len=-1, int flags=MS_SYNC) |
virtual int | sync (void *addr, size_t len, int flags=MS_SYNC) |
Sync the memory region to the backing store starting at addr. | |
virtual int | protect (ssize_t len=-1, int prot=PROT_RDWR) |
virtual int | protect (void *addr, size_t len, int prot=PROT_RDWR) |
virtual void * | base_addr (void) const |
virtual void | dump (void) const |
Dump the state of an object. | |
Public Attributes | |
ACE_ALLOC_HOOK_DECLARE | |
Declare the dynamic allocation hooks. | |
Protected Member Functions | |
virtual size_t | round_up (size_t nbytes) |
virtual int | commit_backing_store_name (size_t rounded_bytes, ACE_OFF_T &offset) |
virtual int | find_seg (const void *const searchPtr, ACE_OFF_T &offset, size_t &counter) |
Find the segment that contains the searchPtr. | |
virtual int | in_use (ACE_OFF_T &offset, size_t &counter) |
Determine how much memory is currently in use. | |
virtual int | handle_signal (int signum, siginfo_t *, ucontext_t *) |
Protected Attributes | |
void * | base_addr_ |
size_t | file_perms_ |
File permissions to use when creating/opening a segment. | |
size_t | max_segments_ |
Number of shared memory segments in the <SHM_TABLE> table. | |
ACE_OFF_T | minimum_bytes_ |
What the minimim bytes of the initial segment should be. | |
size_t | segment_size_ |
Shared memory segment size. | |
key_t | base_shm_key_ |
Base shared memory key for the segment. | |
ACE_Sig_Handler | signal_handler_ |
Handles SIGSEGV. |
ACE_Shared_Memory_Pool::ACE_Shared_Memory_Pool | ( | const ACE_TCHAR * | backing_store_name = 0 , |
|
const OPTIONS * | options = 0 | |||
) |
Initialize the pool.
ACE_Shared_Memory_Pool::~ACE_Shared_Memory_Pool | ( | void | ) | [virtual] |
void * ACE_Shared_Memory_Pool::acquire | ( | size_t | nbytes, | |
size_t & | rounded_bytes | |||
) | [virtual] |
Acquire at least nbytes from the memory pool. rounded_byes is the actual number of bytes allocated. Also acquires an internal semaphore that ensures proper serialization of Memory_Pool initialization across processes.
void * ACE_Shared_Memory_Pool::base_addr | ( | void | ) | const [virtual] |
Return the base address of this memory pool, 0 if base_addr never changes.
int ACE_Shared_Memory_Pool::commit_backing_store_name | ( | size_t | rounded_bytes, | |
ACE_OFF_T & | offset | |||
) | [protected, virtual] |
Commits a new shared memory segment if necessary after an <acquire> or a signal. offset is set to the new offset into the backing store.
void ACE_Shared_Memory_Pool::dump | ( | void | ) | const [virtual] |
Dump the state of an object.
int ACE_Shared_Memory_Pool::find_seg | ( | const void *const | searchPtr, | |
ACE_OFF_T & | offset, | |||
size_t & | counter | |||
) | [protected, virtual] |
Find the segment that contains the searchPtr.
int ACE_Shared_Memory_Pool::handle_signal | ( | int | signum, | |
siginfo_t * | siginfo, | |||
ucontext_t * | ||||
) | [protected, virtual] |
Handle SIGSEGV and SIGBUS signals to remap shared memory properly.
Reimplemented from ACE_Event_Handler.
int ACE_Shared_Memory_Pool::in_use | ( | ACE_OFF_T & | offset, | |
size_t & | counter | |||
) | [protected, virtual] |
Determine how much memory is currently in use.
void * ACE_Shared_Memory_Pool::init_acquire | ( | size_t | nbytes, | |
size_t & | rounded_bytes, | |||
int & | first_time | |||
) | [virtual] |
Ask system for initial chunk of local memory.
int ACE_Shared_Memory_Pool::protect | ( | void * | addr, | |
size_t | len, | |||
int | prot = PROT_RDWR | |||
) | [virtual] |
Change the protection of the pages of the mapped region to prot starting at addr up to len bytes.
int ACE_Shared_Memory_Pool::protect | ( | ssize_t | len = -1 , |
|
int | prot = PROT_RDWR | |||
) | [virtual] |
Change the protection of the pages of the mapped region to prot starting at this->base_addr_
up to len bytes. If len == -1 then change protection of all pages in the mapped region.
int ACE_Shared_Memory_Pool::release | ( | int | destroy = 1 |
) | [virtual] |
Instruct the memory pool to release all of its resources.
size_t ACE_Shared_Memory_Pool::round_up | ( | size_t | nbytes | ) | [protected, virtual] |
Implement the algorithm for rounding up the request to an appropriate chunksize.
int ACE_Shared_Memory_Pool::sync | ( | void * | addr, | |
size_t | len, | |||
int | flags = MS_SYNC | |||
) | [virtual] |
Sync the memory region to the backing store starting at addr.
int ACE_Shared_Memory_Pool::sync | ( | ssize_t | len = -1 , |
|
int | flags = MS_SYNC | |||
) | [virtual] |
Sync the memory region to the backing store starting at this->base_addr_
.
Declare the dynamic allocation hooks.
void* ACE_Shared_Memory_Pool::base_addr_ [protected] |
Base address of the shared memory segment. If this has the value of 0 then the OS is free to select any address, otherwise this value is what the OS must try to use to map the shared memory segment.
key_t ACE_Shared_Memory_Pool::base_shm_key_ [protected] |
Base shared memory key for the segment.
size_t ACE_Shared_Memory_Pool::file_perms_ [protected] |
File permissions to use when creating/opening a segment.
size_t ACE_Shared_Memory_Pool::max_segments_ [protected] |
Number of shared memory segments in the <SHM_TABLE> table.
ACE_OFF_T ACE_Shared_Memory_Pool::minimum_bytes_ [protected] |
What the minimim bytes of the initial segment should be.
size_t ACE_Shared_Memory_Pool::segment_size_ [protected] |
Shared memory segment size.
Handles SIGSEGV.