29.3 Cartridge Services — Memory Services
Lists and describes cartridge services memory services functions.
Table 29-2 lists the memory services functions that are described in this section.
Table 29-2 Memory Services Functions
Function | Purpose |
---|---|
Start a user duration |
|
Terminate a user duration |
|
Allocate memory of a given size from a given duration |
|
Free a memory chunk |
|
Resize a memory chunk |
See Also:
Oracle Database Data Cartridge Developer's Guide for more information about using these functions
29.3.1 OCIDurationBegin()
Starts a user duration.
Purpose
Starts a user duration.
Syntax
sword OCIDurationBegin ( OCIEnv *env, OCIError *err, const OCISvcCtx *svc, OCIDuration parent, OCIDuration *duration );
Parameters
- env (IN/OUT)
-
The OCI environment handle. This should be passed as
NULL
for cartridge services. - err (IN/OUT)
-
The OCI error handle. If there is an error, it is recorded in
err
, and this function returnsOCI_ERROR
. Diagnostic information can be obtained by callingOCIErrorGet()
. - svc (IN)
-
The OCI service context handle.
- parent (IN)
-
The duration number of the parent duration. It is one of the following:
-
A user duration that was previously created
-
OCI_DURATION_STATEMENT
-
OCI_DURATION_SESSION
Comments
This function starts a user duration. A user can have multiple active user durations simultaneously. The user durations do not have to be nested. The duration
parameter is used to return a number that uniquely identifies the duration created by this call.
Note that the environment and service context parameters cannot both be NULL
.
Related Topics
29.3.2 OCIDurationEnd()
Terminates a user duration.
Purpose
Terminates a user duration.
Syntax
sword OCIDurationEnd ( OCIEnv *env, OCIError *err, const OCISvcCtx *svc, OCIDuration duration );
Parameters
- env (IN/OUT)
-
The OCI environment handle.
- err (IN/OUT)
-
The OCI error handle. If there is an error, it is recorded in
err
, and this function returnsOCI_ERROR
. Diagnostic information can be obtained by callingOCIErrorGet()
. - svc (IN)
-
OCI service context (this should be passed as
NULL
for cartridge services; otherwise, it should be non-NULL
). - duration (IN)
-
A user duration previously created by
OCIDurationBegin()
.
Comments
This function terminates a user duration.
Note that the environment and service context parameters cannot both be NULL
.
29.3.3 OCIMemoryAlloc()
Allocates memory of a given size from a given duration.
Purpose
Allocates memory of a given size from a given duration.
Syntax
sword OCIMemoryAlloc( void *hndl, OCIError *err, void **mem, OCIDuration dur, ub4 size, ub4 flags );
Parameters
- hndl (IN)
-
The OCI environment handle (
OCIEnv *
) ifdur
isOCI_DURATION_PROCESS
; otherwise, the user session handle (OCISession *
). - err (IN)
-
The error handle.
- mem (OUT)
-
Memory allocated.
- dur (IN)
-
A previously created user duration or one of these values:
OCI_DURATION_CALLOUT
OCI_DURATION_STATEMENT
OCI_DURATION_SESSION
OCI_DURATION_PROCESS
- size (IN)
-
Size of memory to be allocated.
- flags (IN)
-
Set the
OCI_MEMORY_CLEARED
bit to get memory that has been cleared.
Comments
To allocate memory for the duration of the callout of the agent, that is, external procedure duration, use OCIExtProcAllocCallMemory()
or OCIMemoryAlloc()
with dur
as OCI_DURATION_CALLOUT
.
Returns
Error code.
Related Topics
29.3.4 OCIMemoryFree()
Frees a memory chunk.
Purpose
Frees a memory chunk.
Syntax
sword OCIMemoryFree ( void *hndl, OCIError *err, void *mem );
Parameters
Returns
Error code.
Related Topics
29.3.5 OCIMemoryResize()
Resizes a memory chunk to a new size.
Purpose
Resizes a memory chunk to a new size.
Syntax
sword OCIMemoryResize( void *hndl, OCIError *err, void **mem, ub4 newsize, ub4 flags );
Parameters
Comments
Memory must have been allocated before this function can be called to resize.
Returns
Error code.
Related Topics