globus_callback_spaces(3) Globus Callback Spaces

Macros


#define GLOBUS_CALLBACK_GLOBAL_SPACE
Global callback space.

Enumerations

Functions


globus_result_t globus_callback_space_init (globus_callback_space_t *space, globus_callback_space_attr_t attr)
Initialize a user space.
globus_result_t globus_callback_space_reference (globus_callback_space_t space)
Take a reference to a space.
globus_result_t globus_callback_space_destroy (globus_callback_space_t space)
Destroy a reference to a user space.
globus_result_t globus_callback_space_attr_init (globus_callback_space_attr_t *attr)
Initialize a space attr.
globus_result_t globus_callback_space_attr_destroy (globus_callback_space_attr_t attr)
Destroy a space attr.
globus_result_t globus_callback_space_attr_set_behavior (globus_callback_space_attr_t attr, globus_callback_space_behavior_t behavior)
Set the behavior of a space.
globus_result_t globus_callback_space_attr_get_behavior (globus_callback_space_attr_t attr, globus_callback_space_behavior_t *behavior)
Get the behavior associated with an attr.
globus_result_t globus_callback_space_get (globus_callback_space_t *space)
Retrieve the space of a currently running callback.
int globus_callback_space_get_depth (globus_callback_space_t space)
Retrieve the current nesting level of a space.
globus_bool_t globus_callback_space_is_single (globus_callback_space_t space)
See if the specified space is a single threaded behavior space.

Detailed Description

Macro Definition Documentation

#define GLOBUS_CALLBACK_GLOBAL_SPACE

Global callback space. The 'global' space handle.

This is the default space handle implied if no spaces are explicitly created.

Enumeration Type Documentation

enum globus_callback_space_behavior_t

Callback space behaviors describe how a space behaves. In a non-threaded build all spaces exhibit a behavior == _BEHAVIOR_SINGLE. Setting a specific behavior in this case is ignored.

In a threaded build, _BEHAVIOR_SINGLE retains all the rules and behaviors of a non-threaded build while _BEHAVIOR_THREADED makes the space act as the global space.

Setting a space's behavior to _BEHAVIOR_SINGLE guarantees that the poll protection will always be there and all callbacks are serialized and only kicked out when polled for. In a threaded build, it is still necessary to poll for callbacks in a _BEHAVIOR_SINGLE space. (globus_cond_wait() will take care of this for you also)

Setting a space's behavior to _BEHAVIOR_SERIALIZED guarantees that the poll protection will always be there and all callbacks are serialized. In a threaded build, it is NOT necessary to poll for callbacks in a _BEHAVIOR_SERIALIZED space. Callbacks in this space will be delivered as soon as possible, but only one outstanding (and unblocked) callback will be allowed at any time.

Setting a space's behavior to _BEHAVIOR_THREADED allows the user to have the poll protection provided by spaces when built non-threaded, yet, be fully threaded when built threaded (where poll protection is not needed)

Enumerator

GLOBUS_CALLBACK_SPACE_BEHAVIOR_SINGLE
The default behavior. Indicates that you always want poll protection and single threaded behavior (callbacks need to be explicitly polled for
GLOBUS_CALLBACK_SPACE_BEHAVIOR_SERIALIZED
Indicates that you want poll protection and all callbacks to be serialized (but they do not need to be polled for in a threaded build)
GLOBUS_CALLBACK_SPACE_BEHAVIOR_THREADED
Indicates that you only want poll protection

Function Documentation

globus_result_t globus_callback_space_attr_destroy (globus_callback_space_attr_t attr)

Destroy a space attr.

Parameters:

attr attr to destroy, previously initialized with globus_callback_space_attr_init()

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_ARGUMENT on NULL attr
  • GLOBUS_SUCCESS

See also:

globus_callback_space_attr_init()

globus_result_t globus_callback_space_attr_get_behavior (globus_callback_space_attr_t attr, globus_callback_space_behavior_t * behavior)

Get the behavior associated with an attr. Note: for a non-threaded build, this will always pass back a behavior == GLOBUS_CALLBACK_SPACE_BEHAVIOR_SINGLE.

Parameters:

attr attr on which to query behavior
behavior storage for the behavior

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_ARGUMENT
  • GLOBUS_SUCCESS

globus_result_t globus_callback_space_attr_init (globus_callback_space_attr_t * attr)

Initialize a space attr. Currently, the only attr to set is the behavior. The default behavior associated with this attr is GLOBUS_CALLBACK_SPACE_BEHAVIOR_SINGLE

Parameters:

attr storage for the intialized attr. Must be destroyed with globus_callback_space_attr_destroy()

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_ARGUMENT on NULL attr
  • GLOBUS_CALLBACK_ERROR_MEMORY_ALLOC
  • GLOBUS_SUCCESS

globus_result_t globus_callback_space_attr_set_behavior (globus_callback_space_attr_t attr, globus_callback_space_behavior_t behavior)

Set the behavior of a space.

Parameters:

attr attr to associate behavior with
behavior desired behavior

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_ARGUMENT
  • GLOBUS_SUCCESS

See also:

globus_callback_space_behavior_t

globus_result_t globus_callback_space_destroy (globus_callback_space_t space)

Destroy a reference to a user space. This will destroy a reference to a previously initialized space. Space will not actually be destroyed until all callbacks registered with this space have been run and unregistered (if the user has a handle to that callback) AND all references (from globus_callback_space_reference()) have been destroyed.

Parameters:

space space to destroy, previously initialized by globus_callback_space_init() or referenced with globus_callback_space_reference()

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_SPACE
  • GLOBUS_SUCCESS

See also:

globus_callback_space_init()

globus_callback_space_reference()

globus_result_t globus_callback_space_get (globus_callback_space_t * space)

Retrieve the space of a currently running callback.

Parameters:

space storage for the handle to the space currently running

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_ARGUMENT on NULL space
  • GLOBUS_CALLBACK_ERROR_NO_ACTIVE_CALLBACK
  • GLOBUS_SUCCESS

int globus_callback_space_get_depth (globus_callback_space_t space)

Retrieve the current nesting level of a space.

Parameters:

space The space to query.

Returns:

  • the current nesting level
  • -1 on invalid space

globus_result_t globus_callback_space_init (globus_callback_space_t * space, globus_callback_space_attr_t attr)

Initialize a user space. This creates a user space.

Parameters:

space storage for the initialized space handle. This must be destroyed with globus_callback_space_destroy()
attr a space attr descibing desired behaviors. If GLOBUS_NULL, the default behavior of GLOBUS_CALLBACK_SPACE_BEHAVIOR_SINGLE is assumed. This attr is copied into the space, so it is acceptable to destroy the attr as soon as it is no longer needed

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_ARGUMENT on NULL space
  • GLOBUS_CALLBACK_ERROR_MEMORY_ALLOC
  • GLOBUS_SUCCESS

See also:

globus_condattr_setspace()

globus_io_attr_set_callback_space()

globus_bool_t globus_callback_space_is_single (globus_callback_space_t space)

See if the specified space is a single threaded behavior space.

Parameters:

space the space to query

Returns:

  • GLOBUS_TRUE if space's behavior is _BEHAVIOR_SINGLE
  • GLOBUS_FALSE otherwise

globus_result_t globus_callback_space_reference (globus_callback_space_t space)

Take a reference to a space. A library which has been 'given' a space to provide callbacks on would use this to take a reference on the user's space. This prevents mayhem should a user destroy a space before the library is done with it. This reference should be destroyed with globus_callback_space_destroy() (think dup())

Parameters:

space space to reference

Returns:

  • GLOBUS_CALLBACK_ERROR_INVALID_SPACE
  • GLOBUS_SUCCESS

Author

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