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"Team Ada: Ada Advocacy Issues (83 & 95)" <[log in to unmask]>
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From:
Edward Colbert <[log in to unmask]>
Date:
Thu, 28 Jun 2001 07:35:33 -0700
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Edward Colbert <[log in to unmask]>
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Hi All,

Can someone confirm that it is still implementation defined whether I/O
operations (Put, Get, 'Write, 'Read) are atomic, blocking, or subject to
Priority_Ceiling.  In quick review of the manual & rational, I found the
following:

1) File_Type's and Root_Stream_Type are not publicly defined using pragma
Atomic.
2) Get_Immediate is non-blocking according Rationale section A.1.
3) A.10.7(24) Says Get_Immediate doesn't wait for end of line.
4) Annex H provides NO_IO pragma to disallow use of standard IO packages
(and Ravenscare requires this pragma).
5) Annex D doesn't mention I/O.

I don't see a specific statement about the semantics of I/O operations in a
concurrent environment.

Take Care,
Ed

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"Always do right.  It will please a few and astonish the rest."
 Mark Twain
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Edward Colbert
President
Absolute Software Co., Inc.
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