Because they do return error codes, if something is wrong. I thought I remembered reading something in the standard about changing the behavior on an error, i.e., you can make it not do an MPI_Abort on error, IIRC.
-----Original Message-----
From: Phil Ehrens [mailto:pehrens_at_[hidden]]
Sent: Friday, February 04, 2005 13:20
To: General LAM/MPI mailing list
Subject: Re: LAM: Negative rank or communicator size?
Angel Tsankov wrote:
> Why do functions such as MPI_Comm_rank and MPI_Comm_size return int instead
> of unsigned int?
I have wondered about that too... though I have to say, it
certainly catches your attention when rank -32764 fails.
--
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