SummaryThe target enter data directive specifies that variables are mapped to a device data environment. The target enter data directive is a stand-alone directive.
Syntax
The syntax of the target enter data construct is as follows:
#pragma omp target enter data [ clause[ [,] clause]...] new-line
where clause is one of the following:
if([ target enter data :] scalar-expression)
device(integer-expression)
map([map-type-modifier[,] [map-type-modifier[,] ...] map-type: locator-list)
depend([depend-modifier,] dependence-type : locator-list)
nowait
The syntax of the target enter data is as follows:
!$omp target enter data [ clause[ [,] clause]...]
where clause is one of the following:
if([ target enter data :] scalar-logical-expression)
device(scalar-integer-expression)
map([map-type-modifier[,] [map-type-modifier[,] ...] map-type: locator-list)
depend([depend-modifier,] dependence-type : locator-list)
nowait
BindingThe binding task set for a target enter data region is the generating task, which is the target task generated by the target enter data construct. The target enter data region binds to the corresponding target task region.
DescriptionWhen a target enter data construct is encountered, the list items are mapped to the device data environment according to the map clause semantics. The target enter data construct is a task generating construct. The generated task is a target task. The generated task region encloses the target enter data region.
All clauses are evaluated when the target enter data construct is encountered. The data environment of the target task is created according to the data-sharing attribute clauses on the target enter data construct, per-data environment ICVs, and any default data-sharing attribute rules that apply to the target enter data construct. A variable that is mapped in the target enter data construct has a default data-sharing attribute of shared in the data environment of the target task.
Assignment operations associated with mapping a variable (see Section 2.19.7.1 on page 939) occur when the target task executes.
If the nowait clause is present, execution of the target task may be deferred. If the nowait clause is not present, the target task is an included task.
If a depend clause is present, it is associated with the target task.
If no device clause is present, the default device is determined by the default-device-var ICV.
When an if clause is present and the if clause expression evaluates to false, the device is the host.
Execution Model Events Events associated with a target task are the same as for the task construct defined in Section 2.10.1 on page 384.
The target-enter-data-begin event occurs when a thread enters a target enter data region.
The target-enter-data-end event occurs when a thread exits a target enter data region.
Tool CallbacksCallbacks associated with events for target tasks are the same as for the task construct defined in Section 2.10.1 on page 384; (flags & ompt_task_target) always evaluates to true in the dispatched callback. A thread dispatches a registered ompt_callback_target callback with ompt_scope_begin as its endpoint argument and ompt_target_enter_data as its kind argument for each occurrence of a target-enter-data-begin event in that thread in the context of the target task on the host. Similarly, a thread dispatches a registered ompt_callback_target callback with ompt_scope_end as its endpoint argument and ompt_target_enter_data as its kind argument for each occurrence of a target-enter-data-end event in that thread in the context of the target task on the host. These callbacks have type signature ompt_callback_target_t.