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<a href="Scientific-module.html">Package Scientific</a> ::
<a href="Scientific.MPI-module.html">Package MPI</a> ::
Class MPIRequest
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<!-- ==================== CLASS DESCRIPTION ==================== -->
<h1 class="epydoc">Class MPIRequest</h1><p class="nomargin-top"></p>
<p>MPI Request</p>
<p>There is no constructor for MPI Request objects. They are returned by
nonblocking send and receives, and are used to query the status of the
message.</p>
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<td><span class="summary-sig"><a href="Scientific.MPI.MPIRequest-class.html#test" class="summary-sig-name">test</a>(<span class="summary-sig-arg">self</span>)</span><br />
Test if communications have completed.</td>
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<td><span class="summary-sig"><a href="Scientific.MPI.MPIRequest-class.html#wait" class="summary-sig-name">wait</a>(<span class="summary-sig-arg">self</span>)</span><br />
Wait till the communication has completed.</td>
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<h3 class="epydoc"><span class="sig"><span class="sig-name">test</span>(<span class="sig-arg">self</span>)</span>
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<p>Test if communications have completed.</p>
<p>If the operation was a nonblocking send, it returns 0 if the operation
has not completed, and 1 if it has.</p>
<p>If the operation was a nonblocking receive, 0 is returned if the
operation was not completed, and a tuple containing four elements if it
was completed. The four elements are: the array containing the data, the
source process rank (an integer), the message tag (an integer), and the
number of elements that were received (an integer).</p>
<p>Once a test has been successful (i.e. the operation has completed), it
is no longer possible to call wait() or test() on the MPI Request
object.</p>
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<p>Wait till the communication has completed.</p>
<p>If the operation was a nonblocking send, there is no return value. If
the operation was a nonblocking receive, the return value is a tuple
containing four elements: the array containing the data, the source
process rank (an integer), the message tag (an integer), and the number
of elements that were received (an integer).</p>
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