Folks,
Can someone shed some light on how I can accomplish something similar to this:
exec("foo action")
exec("foobar action")
Process.wait
I want to wait on the second process, yet in ruby 184, all processes are waited on (until completion). How can I effectively fork off these process simultaneously and wait for the last one to complete or what would be really nice, is to wait for both of these separate processes to finish.
TIA!
Phy
Does:
fork {exec "foo action"}
fork {exec "foobar action"}
Process.waitall
do what you want?
On 9/28/06, Phy Prabab <phyprabab@yahoo.com> wrote:
Folks,
Can someone shed some light on how I can accomplish something similar to this:
exec("foo action")
exec("foobar action")
Process.waitI want to wait on the second process, yet in ruby 184, all processes are waited on (until completion). How can I effectively fork off these process simultaneously and wait for the last one to complete or what would be really nice, is to wait for both of these separate processes to finish.
First of all, exec replaces the current process with an external command.
Also Process.wait (if you got to it, which you wouldn't after exec)
wait's for any child process to terminate.
Now assuming that "foo action" and "foobar action" are ruby
expressions and not external commands I thing you want something like
this:
child_pid1 = fork { foo action }
child_pid2 = fork {foobar action}
child_pid1 and child_pid2 will be the process id's of the respective children.
Now you can do a variety of things as far as waiting for the processes
to end including:
# wait for any child to exit and return it's process id
child_pid = Process.wait
# wait for all children to exit and return an array of the form:
# [[pid1, status1], ...]
status_arrays = Process.wait_all
# wait for any child to exit and return an array containing the child
# processes pid and status
status_array = Process.wait2
# wait for a specific child process
waitpid(child_pid1)
On 9/28/06, Phy Prabab <phyprabab@yahoo.com> wrote:
Folks,
Can someone shed some light on how I can accomplish something similar to this:
exec("foo action")
exec("foobar action")
Process.waitI want to wait on the second process, yet in ruby 184, all processes are waited on (until completion). How can I effectively fork off these process simultaneously and wait for the last one to complete or what would be really nice, is to wait for both of these separate processes to finish.
--
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/
Well, I guess I should give more detail, the process I want to fork are external commands. Following a post from another help individual, I assume I shoul do something like this:
pida = fork { exec "command a;command b" }
pidb = fork { exec "command a;command b" }
Process.waitall
Something along these lines?
TIA,
Phy
----- Original Message ----
From: Rick DeNatale <rick.denatale@gmail.com>
To: ruby-talk ML <ruby-talk@ruby-lang.org>
Sent: Thursday, September 28, 2006 4:51:29 PM
Subject: Re: Question on exec subprocesses
On 9/28/06, Phy Prabab <phyprabab@yahoo.com> wrote:
Folks,
Can someone shed some light on how I can accomplish something similar to this:
exec("foo action")
exec("foobar action")
Process.waitI want to wait on the second process, yet in ruby 184, all processes are waited on (until completion). How can I effectively fork off these process simultaneously and wait for the last one to complete or what would be really nice, is to wait for both of these separate processes to finish.
First of all, exec replaces the current process with an external command.
Also Process.wait (if you got to it, which you wouldn't after exec)
wait's for any child process to terminate.
Now assuming that "foo action" and "foobar action" are ruby
expressions and not external commands I thing you want something like
this:
child_pid1 = fork { foo action }
child_pid2 = fork {foobar action}
child_pid1 and child_pid2 will be the process id's of the respective children.
Now you can do a variety of things as far as waiting for the processes
to end including:
# wait for any child to exit and return it's process id
child_pid = Process.wait
# wait for all children to exit and return an array of the form:
# [[pid1, status1], ...]
status_arrays = Process.wait_all
# wait for any child to exit and return an array containing the child
# processes pid and status
status_array = Process.wait2
# wait for a specific child process
waitpid(child_pid1)
--
Rick DeNatale
My blog on Ruby
http://talklikeaduck.denhaven2.com/
Thanks, this works like a charm!
----- Original Message ----
From: Wilson Bilkovich <wilsonb@gmail.com>
To: ruby-talk ML <ruby-talk@ruby-lang.org>
Sent: Thursday, September 28, 2006 4:45:44 PM
Subject: Re: Question on exec subprocesses
On 9/28/06, Phy Prabab <phyprabab@yahoo.com> wrote:
Folks,
Can someone shed some light on how I can accomplish something similar to this:
exec("foo action")
exec("foobar action")
Process.waitI want to wait on the second process, yet in ruby 184, all processes are waited on (until completion). How can I effectively fork off these process simultaneously and wait for the last one to complete or what would be really nice, is to wait for both of these separate processes to finish.
Does:
fork {exec "foo action"}
fork {exec "foobar action"}
Process.waitall
do what you want?