Interpretations

Answering questions that may arise related to the meaning of portions of an IEEE standard concerning specific applications.

IEEE Standards Interpretations for IEEE Std 1003.1c™-1995 IEEE Standard for Information Technology--Portable Operating System Interface (POSIX(R)) - System Application Program Interface (API) Amendment 2: Threads Extension (C Language)

Copyright © 1996 by the Institute of Electrical and Electronics Engineers, Inc. 345 East 47th Street New York, New York 10017 USA All Rights Reserved.

These are interpretations of IEEE Std 1003.1c-1995.

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Interpretation Request #7
Topic: PTHREAD_INHERIT_SCHED Relevant Clauses: 13.5.1.1

Right now all I have to work from are the draft 8 document, plus the draft 9 and 10 change documents, but draft 10 was approved as the final specification. My question concerns 13.5.1.1 in draft 8 (lines 302-306) This text was not modified by drafts 9 or 10. When a thread is created with a value of PTHREAD_INHERIT_SCHED for the inheritsched attribute, is the scheduling contention scope one of the attributes that is inherited? Or should the new thread get the implementation-defined default scheduling contention scope?

Interpretation Response
The standard is clear: contentionscope is one of the attributes controlled by inheritsched. IEEE Std 1003.1c-1995, page 296, line 397 states: "The contentionscope attribute defines the scheduling ...." and on line 401 the standard uses this fact ".....set according to the other scheduling attributes in pthread_attr_t object."

Rationale for Interpretation
None. 