I am using HPUX on Itanium and I have c program where I am doing
something like this
but this pthread_create always fails at runtime
prio = PRI_MAX;
prio_low = PRI_MIN;
..
..
..
..
struct sched_param sched_param={1};
sched_param.sched_priority=prio;
thret = pthread_attr_setschedparam(&serv_attr, &sched_param);

thret =
pthread_attr_setinheritsched(&serv_attr,PTHREAD_EX PLICIT_SCHED);

..
..
..
thret = pthread_create(&sthread,&serv_attr,server_main, 0);

but if i remove this line

thret =
pthread_attr_setinheritsched(&serv_attr,PTHREAD_EX PLICIT_SCHED);

it works fine, can anyone suggest whats happening here. I have tried
the same on AIX and Solaris, it works there.

abhijeet.bhattacharya@gmail.com wrote:
> I am using HPUX on Itanium and I have c program where I am doing
> something like this
> but this pthread_create always fails at runtime
> prio = PRI_MAX;
> prio_low = PRI_MIN;
> .
> .
> .
> .
> struct sched_param sched_param={1};
> sched_param.sched_priority=prio;
> thret = pthread_attr_setschedparam(&serv_attr, &sched_param);

> thret =
> pthread_attr_setinheritsched(&serv_attr,PTHREAD_EX PLICIT_SCHED);
> .
> .
> .
> thret = pthread_create(&sthread,&serv_attr,server_main, 0);

> but if i remove this line
> thret =
> pthread_attr_setinheritsched(&serv_attr,PTHREAD_EX PLICIT_SCHED);

> it works fine, can anyone suggest whats happening here. I have tried
> the same on AIX and Solaris, it works there.

Are you checking the return status on the call to make sure it
succeded? If it failed, perhaps the serv_attr isn't in a usable state
and that triggers the pthread_create failure. What is the specific
error return from pthread_create?

I know it is a tired, old song and dance, but have you checked the
various manpages on HP-UX for those calls?

rick jones
--
denial, anger, bargaining, depression, acceptance, rebirth...
where do you want to be today?
these opinions are mine, all mine; HP might not want them anyway...
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

abhijeet wrote:
: I am using HPUX on Itanium and I have C program where I am doing
: something like this but this pthread_create always fails at runtime
: struct sched_param sched_param={1};

This was also submitted on the ITRC:
http://forums1.itrc.hp.com/service/f...readId=1090167

I tracked this down to the value 1. It has to be in the range:
Min pri: -256, max pri: -129

And only by root.