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How to pass information to child processes
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Join Date: Oct 2007
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My problem is that I have a PHP application that needs to (in Windowsese) multi-task. I am relatively new to PHP and equally new to Linux. I need to know how to pass information from a parent process to a child process and vice versa. If somebody could please provide an example, it would be very much appreciated.
Hoppy
Hoppy
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Originally Posted by hopalongcassidy 
My problem is that I have a PHP application that needs to (in Windowsese) multi-task. I am relatively new to PHP and equally new to Linux. I need to know how to pass information from a parent process to a child process and vice versa. If somebody could please provide an example, it would be very much appreciated.
Hoppy
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Join Date: Oct 2007
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Of course not. If I knew how to pass info from one process to another, I would not have asked the question!
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Originally Posted by hopalongcassidy
Of course not. If I knew how to pass info from one process to another, I would not have asked the question!
GCS d- s+ a-->? C++(++++) UL+++ P+>+++ L+++ E--- W+++
N+ o K w++(---) O? !M- V PS+>++ PE+ Y+ PGP !t- 5? X- R tv+
b+>++ DI+ D G++>+++ e+ h+>++ r y+
PMs asking for help will not be answered, post on the forums. That's what they're there for.
N+ o K w++(---) O? !M- V PS+>++ PE+ Y+ PGP !t- 5? X- R tv+
b+>++ DI+ D G++>+++ e+ h+>++ r y+
PMs asking for help will not be answered, post on the forums. That's what they're there for.
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Join Date: Oct 2007
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Junior Poster
My question is not the least bit vague. It is perfectly clear. Let's say, for example, that I had a parent process whose job it was to read a file containing URLs. And that each child process was supposed to read the contents of a given URL and save it to a disc file.
In this case, I would want the parent to create a child for each URL and pass the URL to the child which would in turn read its contents and store it in a file on disc. Perhaps, the child would return to the parent, the name of the file in which the contents of the URL are saved.
What I am looking for is the PHP mechanism by which the URL can be passed to the child and the name of the file in which the contents of the URL is stored can be returned to the parent.
Something like SendData($parentid, $childid, &dataaddress, datalen);
Is that any clearer?
Hoppy
In this case, I would want the parent to create a child for each URL and pass the URL to the child which would in turn read its contents and store it in a file on disc. Perhaps, the child would return to the parent, the name of the file in which the contents of the URL are saved.
What I am looking for is the PHP mechanism by which the URL can be passed to the child and the name of the file in which the contents of the URL is stored can be returned to the parent.
Something like SendData($parentid, $childid, &dataaddress, datalen);
Is that any clearer?
Hoppy
The only current way to do anything of that sort is on execution of a child process with http://us.php.net/manual/en/function.pcntl-exec.php
GCS d- s+ a-->? C++(++++) UL+++ P+>+++ L+++ E--- W+++
N+ o K w++(---) O? !M- V PS+>++ PE+ Y+ PGP !t- 5? X- R tv+
b+>++ DI+ D G++>+++ e+ h+>++ r y+
PMs asking for help will not be answered, post on the forums. That's what they're there for.
N+ o K w++(---) O? !M- V PS+>++ PE+ Y+ PGP !t- 5? X- R tv+
b+>++ DI+ D G++>+++ e+ h+>++ r y+
PMs asking for help will not be answered, post on the forums. That's what they're there for.
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Join Date: Oct 2007
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I read the URL you provided and especially the user contributed notes that followed. It appears to me that the folks that designed the process control portion of PHP (pcntl) were rank amateurs with little real world experience.
Using pcntl_exec after forking really misses the mark. It has no way to pass anything back to the parent, not even a return code.
Using pcntl_exec after forking really misses the mark. It has no way to pass anything back to the parent, not even a return code.
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Originally Posted by hopalongcassidy
I read the URL you provided and especially the user contributed notes that followed. It appears to me that the folks that designed the process control portion of PHP (pcntl) were rank amateurs with little real world experience.
Using pcntl_exec after forking really misses the mark. It has no way to pass anything back to the parent, not even a return code.
GCS d- s+ a-->? C++(++++) UL+++ P+>+++ L+++ E--- W+++
N+ o K w++(---) O? !M- V PS+>++ PE+ Y+ PGP !t- 5? X- R tv+
b+>++ DI+ D G++>+++ e+ h+>++ r y+
PMs asking for help will not be answered, post on the forums. That's what they're there for.
N+ o K w++(---) O? !M- V PS+>++ PE+ Y+ PGP !t- 5? X- R tv+
b+>++ DI+ D G++>+++ e+ h+>++ r y+
PMs asking for help will not be answered, post on the forums. That's what they're there for.
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Join Date: Oct 2007
Posts: 147
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Junior Poster
Good idea. Maybe I will. 
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Originally Posted by hopalongcassidy
I read the URL you provided and especially the user contributed notes that followed. It appears to me that the folks that designed the process control portion of PHP (pcntl) were rank amateurs with little real world experience.
Using pcntl_exec after forking really misses the mark. It has no way to pass anything back to the parent, not even a return code.
http://pleac.sourceforge.net/pleac_p...gementetc.html
http://www.php.net/proc_open
http://www.php.net/socket_create_pair
http://www.php.net/sem
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