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<div>When count= 0, mpich should not raise error if array_of_requests is NULL. Otherwise, one has to write code like if (count) MPI_Startall(count, reqs). Note reqs is often NULL if count=0. See also MPI_Waitall, which has the correct logic. </div>
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<div>MPI_Startall(int count, MPI_Request array_of_requests[]) {<br>
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<div>...</div>
<div> MPIR_ERRTEST_COUNT(count, mpi_errno);<br>
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<div> MPIR_ERRTEST_ARGNULL(array_of_requests, "array_of_requests", mpi_errno);</div>
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<div>}</div>
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<div dir="ltr">--Junchao Zhang</div>
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