globus_handle_table (3) - Linux Manuals
NAME
Handle Table for Reference Counting Data -
Macros
Typedefs
typedef struct
globus_l_handle_table_s * globus_handle_table_t"
Handle table abstract type.
typedef int globus_handle_t
Handle abstract type.
typedef void(* globus_handle_destructor_t )(void *datum)
Handle datum destructor.
Functions
int globus_handle_table_init (globus_handle_table_t *handle_table, globus_handle_destructor_t destructor)
int globus_handle_table_destroy (globus_handle_table_t *handle_table)
Destroy a handle table.
globus_handle_t globus_handle_table_insert (globus_handle_table_t *handle_table, void *value, int initial_refs)
globus_bool_t globus_handle_table_increment_reference_by (globus_handle_table_t *handle_table, globus_handle_t handle, unsigned int inc)
Increment the reference count for handle.
globus_bool_t globus_handle_table_decrement_reference (globus_handle_table_t *handle_table, globus_handle_t handle)
Remove a reference to a handle.
globus_bool_t globus_handle_table_increment_reference (globus_handle_table_t *handle_table, globus_handle_t handle)
Add a reference to a handle table entry.
void * globus_handle_table_lookup (globus_handle_table_t *handle_table, globus_handle_t handle)
Resolve a handle its datum.
Detailed Description
The globus_handle_table_t abstraction provides a reference-counting handle table to automatically free data when there are no more references to it. Each datum in the globus_handle_table_t container has a count associated with it which may be incremented and decremented in single steps or by an increment. While a handle has any references to it, the globus_handle_table_lookup() will return the datum associated with the handle, otherwise it will return NULL. The value of a globus_handle_t is not reused until INT_MAX data have been inserted into the handle table.
Macro Definition Documentation
#define GLOBUS_NULL_HANDLE
Invalid handle valueTypedef Documentation
typedef void(* globus_handle_destructor_t)(void *datum)
Handle datum destructor.
Parameters:
- datum Datum to destroy
Function Documentation
globus_bool_t globus_handle_table_decrement_reference (globus_handle_table_t *handle_table, globus_handle_thandle)
Remove a reference to a handle. Remove a reference to a handle table entry, calling its destructor if no more references exist for the handle.
Parameters:
-
handle_table The table that the handle was created in.
handle The handle to a datum to decrement the reference count for.
Returns:
- The globus_handle_table_decrement_reference() function returns a boolean value indicating whether the handle still references a valid datum.
int globus_handle_table_destroy (globus_handle_table_t *handle_table)
Destroy a handle table. Destroy a handle table and call the destructor for all objects associated with it.
Parameters:
- handle_table Pointer to the handle table to destroy
globus_bool_t globus_handle_table_increment_reference (globus_handle_table_t *handle_table, globus_handle_thandle)
Add a reference to a handle table entry.
Parameters:
-
handle_table The table that the handle was created in.
handle The handle to a datum to increment the reference count for.
Returns:
- The globus_handle_table_increment_reference() function returns a boolean value indicating whether the handle still references a valid datum.
globus_bool_t globus_handle_table_increment_reference_by (globus_handle_table_t *handle_table, globus_handle_thandle, unsigned intinc)
Increment the reference count for handle.
Parameters:
-
handle_table The table that the handle was created in.
handle The handle to a datum to increment the reference count for.
inc The number of references to add the handle.
Returns:
- The globus_handle_table_increment_reference_by() function returns a boolean value indicating whether the handle still references a valid datum.
int globus_handle_table_init (globus_handle_table_t *handle_table, globus_handle_destructor_tdestructor)
Initialize a table of unique reference counted handles.Parameters:
-
handle_table the table of unique handles we want to use.
destructor Function to call to free the data associated with a handle when the handle's reference count reaches 0 or the handle table is destroyed.
globus_handle_t globus_handle_table_insert (globus_handle_table_t *handle_table, void *value, intinitial_refs)
Insert a datum into a handle tableInsert a value into the handle table, and return a unique handle to it.
Parameters:
-
handle_table Handle table to add the value to
value The value to insert into the table
initial_refs The initial reference count of this value in the table
Returns:
- The globus_handle_table_insert() function returns a unique handle to value.
void* globus_handle_table_lookup (globus_handle_table_t *handle_table, globus_handle_thandle)
Resolve a handle its datum.
Parameters:
-
handle_table The table that the handle was created in.
handle The handle to a datum to resolve
Returns:
- The globus_handle_table_lookup() function returns the datum associated with the handle in the handle table, or NULL if the handle does not reference valid data.
Author
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