dtrace discuss - Apr 2007 - Tracing a process that is not created yet.

Hi , 
I have this problem , which might have been discussed here, but I am new
to Dtrace and so apologies if this is not new. 
I have a C++ server which forks off a new process , on a connection. 
I want to trace certain functions in these new processes. 
So , I wrote a test script as follows : 

Proc:::create
{
	self->trace = 1;
}
::Mangled_Function_name:entry
/ self->trace == 1 && execname == "server" /
{
	self->ts[probefunc] = timestamp;
}
::Mangled_Function_name:return
/self->trace == 1 && execname =="server /
{
	printf(" Time taken %d", timestamp - self->ts[probefunc]);
}

When ever the server will create a new process it will enter , in the
first probe for create. 

My questions :
1) First of all when I run the program with the command  "dtrace -s
trial.d" , it gives an error that the probe did not match for the
Mangled_Function_Name. So , I used -Z option to make the program run. 
    Is there any other way. 
2) The newly created processes do not enter into the
Mangled_Function_name probe. However,  when I used the same Function and
use it in a known pid this works. 
So , my question is why doesn''t Dtrace find a match in this newly
created process. 

How do I achieve , this functionality . 

Thanks
Mohnish Kodnani