Maximum Thread creation in solaris

Hi ,
My application is Multithreaded and its a 365x24x7 runnning application Its running on a Solaris Blade machine(with 4GB RAM).

It begins working perfectly and runs in perfect manner for may be for 3~4 months and then suddenly the thread creation fails and it remains failed for along time.
Can i know the reason for same.Why does a thread creation fails
I am using posix threads.

Whats the maximum limit for creation of threads in Solaris.
Is this thread limit limited per process?

thnx

The number of threads is generally "unlimited", i.e. limited only by memory availability.
Are you monitoring memory (physical and virtual) usage ?
What is your threads stack size ?
Are you monitoring the number of threads this process is having ?

Hi
Thanks for ur reply.
Am using default attributes to create a thread so the stack size wld be 1Mb for my 32bit machine as it says in man page of pthread_create

how can i monitor the no of threads in this process.do u know any command
the top command and ps command show only the Kernel level threads , that wont tell the exact number of threads i mean user level threads of my application. Correct ?

prstat will show you the number of threads for each process.