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Old 10-08-2005
PThreads
I have created a thread program, it is attached. My problem is that I need to loop this program multiple times, and basically reset everything including the threads created previously. I try to loop the program, the first run is fine, as always, but the second run of the program, the initialize function gets called but everything else is skipped. On the third (and last) run of the program, the creation of the thread finally executes, but this time, the initalization process is ignored. I say that the third is the last because no matter how many times I try to loop it, the program gets stuck on the third run. My question is: are the threads having a confilct? Also, am I cancelling the threads correctly? Is running the program multiple times, with each time generating new threads and executing the rest of the program properly, possible? Thanks in advance.
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LEARN ABOUT DEBIAN

ns_thread

ns_thread(3aolserver)					    AOLserver Built-In Commands 				     ns_thread(3aolserver)

__________________________________________________________________________________________________________________________________________________

NAME

       ns_thread - commands

SYNOPSIS

       ns_thread begin script

       ns_thread begindetached script

       ns_thread get

       ns_thread getid

       ns_thread wait tid

       ns_thread yield
_________________________________________________________________

DESCRIPTION

       ns_thread begin:
	      begins  a  new  thread which evaluates the specified script and then exits. It returns a thread ID that must eventually be passed to
	      ns_thread wait. (Failing to call ns_thread wait will eventually result in no new threads being created.)

       ns_thread begindetached:
	      begins a detached thread that doesn't have to be (and can't be) waited for.

       ns_thread get:
	      gets the thread ID of the current thread. The result is a thread ID that can be passed to ns_thread wait and may look something like
	      "tid532".

       ns_thread getid:
	      gets  the  thread integer number for the current thread. The result is a small integer used for identifying threads is a human-read-
	      able way, such as "1" or "1120", for example.

       ns_thread wait:
	      waits for the specified thread to exit. The tid argument is a thread ID returned by ns_thread begin or ns_thread get.

       ns_thread yield:
	      causes the current thread to yield.

EXAMPLES

       This example is similar to the example under the ns_sockselect function of connecting to the 10 servers and waiting to  service	them  with
       the ns_sockselect command. In this case, though, each connection gets it's own thread.

       # This is the procedure which is evaluated for each thread and # handles a single connection to host number $i

       proc getpage {i} {
	   global pages
	   # new thread will start here - first connect to host
	   set host [format "www%2d.foo.com" $i]
	   set fds [ns_sockopen $host 80
	   set r [lindex $fds 0]
	   set w [lindex $fds 1]
	   # next, send request 	   0r"
	   puts $w "GET /index.htm HTTP/1.0
	   flush $w
	   # then read page
	   set pages($i) [read $r]
	   # and close sockets
	   close $w
	   close $r
	   # thread goes away here and other threads waiting
	   # on ns_thread wait will wakeup }

       # Here's the loop which creates the threads which run getpage.  for {set i 1} {$i < 9} {incr i} {
	   set tids($i) [ns_thread begin "getpage $i"] }

       # wait for the threads to exit and then process the pages for {set i 1} {$i < 9} {incr i} {
	   ns_thread wait $tids($i)
	   # output page
	   ... process the page in $pages($i) put there by other thread ...  }

       Note that the code here is much simpler to follow than the ns_sockselect example; that's the benefit of multithreaded programming. However,
       it uses more resources as threads need to be created and initialized. This can be a problem if you plan to create many threads.

SEE ALSO

KEYWORDS

       threads

AOLserver								4.0						     ns_thread(3aolserver)