topic Re: Multi-thread unsafe functions on HPUX-11 in Operating System - HP-UX

Multi-thread unsafe functions on HPUX-11

Subbu Saripalli — Thu, 29 Nov 2001 18:37:07 GMT

I found out from techincal resources in this site that the follwoing functions are multi-thread unsafe. However, the man pages did not mention this and I do not see any reentrant functions for them. Please confirm if these functions are unsafe and so what are the alternatives.
select(), difftime(), mktime(), sigaddset(), sigdelset(), sigemptyset(), sigfillset(), gettimeofday()

Thank you!

Re: Multi-thread unsafe functions on HPUX-11

Steven Gillard_2 — Fri, 30 Nov 2001 11:33:42 GMT

The functions you mention are perfectly safe to use in threads. I'm using select, gettimeofday, sigaddset and sigemptyset in a multi-threaded program with no problems.

What document are you reading?

Regards,
Steve

Re: Multi-thread unsafe functions on HPUX-11

Subbu Saripalli — Fri, 30 Nov 2001 14:09:38 GMT

Thank you Steve for your Reply. I appreciate if you can confirm that these functions are thread safe on HPUX 10.2 with DCE threads. ( I have a customer running our app on 10.2)

Re: Multi-thread unsafe functions on HPUX-11

Steven Gillard_2 — Fri, 30 Nov 2001 16:12:23 GMT

Although I can't find any documentation to back me up, I am close to 100% sure that all the functions you listed are thread-safe with user-level DCE threads on 10.20.

Not all routines needed re-entrant interfaces because they don't use static internal data, and the routines you listed would fall into this category.

I am still very curious as to where you got the idea that these routines were thread un-safe in the first place.

Regards,
Steve

Re: Multi-thread unsafe functions on HPUX-11

Subbu Saripalli — Fri, 30 Nov 2001 17:48:07 GMT

Thank you Steve for your reply. On this hp web site(www.hp.com), when I searched for " multi thread unsafe", i found a techinal resource that compares the functions between Solaris and HPUX. It gives a list of functions in a tabular format. The resource seems to be authentic.

Re: Multi-thread unsafe functions on HPUX-11

Steven Gillard_2 — Mon, 03 Dec 2001 09:24:15 GMT

Can you post the URL of the document you have found? I haven't been able to locate it.

Regards,
Steve

Re: Multi-thread unsafe functions on HPUX-11

Subbu Saripalli — Mon, 03 Dec 2001 19:06:24 GMT

It used to appear. We called HP support regarding this and may be they recalled this article.