pthread_set_concurrency & deadlock

[Indira]

Hi,

We are facing a strange problem with pthread_set_concurrency. We have
spawned "n" number of threads & are setting
pthread_set_conccurrency(n). But this leads to application
hanging.(application is responsive to ctrl-c)

By increasing pthread_set_concurrency(n+10), the deadlock problem
seems to be resolved.

Our application is running on Solaris 8.

As 1:1 ratio doesn't work fine, any idea how to give a suitable value?

Regards
Indira

[Thomas Maslen]

In <bb2f8e50.0307240759.77d822f0@posting.google.com > [email]indira1005@yahoo.com[/email] (Indira) writes:

>Hi,
>
>We are facing a strange problem with pthread_set_concurrency. We have
>spawned "n" number of threads & are setting
>pthread_set_conccurrency(n). But this leads to application
>hanging.(application is responsive to ctrl-c)
>
>By increasing pthread_set_concurrency(n+10), the deadlock problem
>seems to be resolved.
>
>Our application is running on Solaris 8.
>
>As 1:1 ratio doesn't work fine, any idea how to give a suitable value?

Does it help at all if, instead of using pthread_set_concurrency() to try
to make the Solaris two-level threading implementation behave sensibly,
you just use the Solaris 8 and 9 one-level threading implementation instead?

See "ALTERNATE IMPLEMENTATION" in "man pthreads". (On Solaris 9 it's the
default, so you don't even have to think about it; on Solaris 8 you have
to refer to it explicitly).


Thomas Maslen
[email]maslen@wedgetail.com[/email]