Release directive
=================
.. index:: release

The ``release`` directive asserts that a task will no longer perform accesses that conflict with the contents of the associated ``depend`` clause.
The contents of the ``depend`` clause must be a subset of that of the task construct that is no longer referenced in the rest of the lifetime of the current task and its future subtasks.
The ``release`` directive has not associated structured block.

.. highlight:: c

The syntax of the ``release`` directive is the following::

   #pragma oss release [clauses]

The valid clauses for the ``release`` directive are:

  * depend(<type>: <memory-reference-list>)
  * <depend-type>(<memory-reference-list>)

The following C code shows an example of partial release of the task dependences using the ``release`` directive::

  #define SIZE 4096

  float x[SIZE];
  float y[SIZE];

  int main() {

    #pragma oss task depend(out:x,y)
    {
       for (int i=0; i<SIZE; i++) x[i] = 0.0;
       #pragma oss release depend(out:x)

       for (int i=0; i<SIZE; i++) y[i] = 0.0;
    }
  }

.. warning:: At this moment, the run-time system only supports releasing a dependency of the same dependency type that was specified at the task ``depend`` clause.