Shared Memory Routines


型定義

typedef apr_shm_t apr_shm_t

関数

apr_status_t apr_shm_create (apr_shm_t **m, apr_size_t reqsize, const char *filename, apr_pool_t *pool)
apr_status_t apr_shm_remove (const char *filename, apr_pool_t *pool)
apr_status_t apr_shm_destroy (apr_shm_t *m)
apr_status_t apr_shm_attach (apr_shm_t **m, const char *filename, apr_pool_t *pool)
apr_status_t apr_shm_detach (apr_shm_t *m)
void * apr_shm_baseaddr_get (const apr_shm_t *m)
apr_size_t apr_shm_size_get (const apr_shm_t *m)
apr_pool_tapr_shm_pool_get (const apr_shm_t *theshm)

型定義

typedef struct apr_shm_t apr_shm_t

Private, platform-specific data struture representing a shared memory segment.


関数

apr_status_t apr_shm_attach ( apr_shm_t **  m,
const char *  filename,
apr_pool_t pool 
)

Attach to a shared memory segment that was created by another process.

引数:
m The shared memory structure to create.
filename The file used to create the original segment. (This MUST match the original filename.)
pool the pool from which to allocate the shared memory structure for this process.

void* apr_shm_baseaddr_get ( const apr_shm_t m  ) 

Retrieve the base address of the shared memory segment. NOTE: This address is only usable within the callers address space, since this API does not guarantee that other attaching processes will maintain the same address mapping.

引数:
m The shared memory segment from which to retrieve the base address.
戻り値:
address, aligned by APR_ALIGN_DEFAULT.

apr_status_t apr_shm_create ( apr_shm_t **  m,
apr_size_t  reqsize,
const char *  filename,
apr_pool_t pool 
)

Create and make accessable a shared memory segment.

引数:
m The shared memory structure to create.
reqsize The desired size of the segment.
filename The file to use for shared memory on platforms that require it.
pool the pool from which to allocate the shared memory structure.
意見:
A note about Anonymous vs. Named shared memory segments: Not all plaforms support anonymous shared memory segments, but in some cases it is prefered over other types of shared memory implementations. Passing a NULL 'file' parameter to this function will cause the subsystem to use anonymous shared memory segments. If such a system is not available, APR_ENOTIMPL is returned.

A note about allocation sizes: On some platforms it is necessary to store some metainformation about the segment within the actual segment. In order to supply the caller with the requested size it may be necessary for the implementation to request a slightly greater segment length from the subsystem. In all cases, the apr_shm_baseaddr_get() function will return the first usable byte of memory.

apr_status_t apr_shm_destroy ( apr_shm_t m  ) 

Destroy a shared memory segment and associated memory.

引数:
m The shared memory segment structure to destroy.

apr_status_t apr_shm_detach ( apr_shm_t m  ) 

Detach from a shared memory segment without destroying it.

引数:
m The shared memory structure representing the segment to detach from.

apr_pool_t* apr_shm_pool_get ( const apr_shm_t theshm  ) 

Get the pool used by this shared memory segment.

apr_status_t apr_shm_remove ( const char *  filename,
apr_pool_t pool 
)

Remove shared memory segment associated with a filename.

引数:
filename The filename associated with shared-memory segment which needs to be removed
pool The pool used for file operations
意見:
This function is only supported on platforms which support name-based shared memory segments, and will return APR_ENOTIMPL on platforms without such support.

apr_size_t apr_shm_size_get ( const apr_shm_t m  ) 

Retrieve the length of a shared memory segment in bytes.

引数:
m The shared memory segment from which to retrieve the segment length.


Apache Portable Runtimeに対してSun Jul 19 22:04:01 2009に生成されました。  doxygen 1.4.7