public Class EXTMigrateMemobject

Returned in the param_value parameter of the clGetEventInfo when param_name is EVENT_COMMAND_TYPE.

This flag specifies that the specified set of memory objects are to be migrated to the host, regardless of the target command queue.

Provides the application with a way to indicate which device a set of memory objects should be associated. Typically, memory objects are implicitly migrated to a device for which enqueued commands, using the memory object, are targeted. clEnqueueMigrateMemObjectEXT allows this migration to be explicitly performed ahead of the dependent commands. This permits an application to overlap the placement of memory objects with other unrelated operations. Once the OpenCL event, returned from clEnqueueMigrateMemObject, has been marked COMPLETE the memory objects specified in mem_objects have been successfully migrated to the device associated with command_queue. The migrated memory object shall remain resident on the device until another command is enqueued that either implicitly or explicitly migrates it away. As well, clEnqueueMigrateMemObjectEXT can be used to direct the initial placement of a memory object, after creation, possibly avoiding the initial overhead of instantiating the object on the first enqueued command to use it.

The user is responsible for managing the event dependencies, associated with this command, in order to avoid overlapping access to memory objects. Improperly specified event dependencies passed to clEnqueueMigrateMemObject could result in undefined results.

Parameters

command_queue:long

a valid command queue

mem_objects:PointerBuffer

the memory objects to migrate to the OpenCL device associated with command_queue

flags:long

a bitfield that is used to specify migration options. One of:

0	MIGRATE_MEM_OBJECT_HOST_EXT

event_wait_list:PointerBuffer

a list of events that need to complete before this particular command can be executed. If event_wait_list is NULL, then this particular command does not wait on any event to complete. The events specified in event_wait_list act as synchronization points. The context associated with events in event_wait_list and command_queue must be the same.

event:PointerBuffer

Returns an event object that identifies this particular command and can be used to query or queue a wait for this particular command to complete. event can be NULL in which case it will not be possible for the application to query the status of this command or queue a wait for this command to complete. If the event_wait_list and the event arguments are not NULL, the event argument should not refer to an element of the event_wait_list array.

Annotations

@NativeType:cl_int

Unsafe version of: EnqueueMigrateMemObjectEXT

Parameters

num_mem_objects:int

the number of memory objects specified in the mem_objects argument

num_events_in_wait_list:int

the number of events in event_wait_list