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. 3 Park Avenue New York, New York 10016-5997 USA All Rights Reserved.
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Interpretation Request #42
Topic: pthread_sigmask, pthread.h Relevant Clauses: 188.8.131.52, 2.7.3
ISO 9945-1:1996, 184.108.40.206, synopsis clause shows pthread_sigmask() declared in signal.h, but 2.7.3 shows it declared in pthread.h. Proposed response: POSIX.1-1996 is unclear and allows the prototype to appear either in pthread.h or signal.h. It is recommended that a future revision require it only in signal.h since pthread.h does not defined sigset_t.
The standard is clear in 2.7.3 that pthread_sigmask shall be defined in pthread.h. But 220.127.116.11 also clearly indicates that pthread_sigmask() is available as if it shall have been defined in , which is a contradiction in the standard. It is the opinion of the interpretations committee that the intent of the working and balloting groups is that shown by the synopsis of 18.104.22.168: the definition of pthread_sigmask should not be pthread.h but rather in signal.h. This is being referred to the sponsor for correction with a request for a speedy resolution. The interpretations committee also noted that the function pthread_kill has the same contradiction.
Rationale for Interpretation
The interpretation committee believes that the standard has a defect that causes a contradiction. The intention was to have the definitions in signals. Additionally, existing industry practice seems to support this belief and the need for a timely response by the sponsor.