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onhiatus
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Joined: May 12 2004
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Posts: 279
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| Posted: October 30 2008 at 03:25 | IP Logged
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So I've got a macro that sends a command via a socket, then waits for the response. This is handled by having the data coming in on the socket trigger another macro which then signals the original macro to continue.
Roughly: The macro does something like
1. Send data
2. wait 1 second
3. check to see if data has come back, if not goto 2
4. Finish macro (copy data into [ Local1 ])
The second macro signals the first macro by writing the data to a file.
This works great, except now I want to trigger it from the web using ph_macroparmret(). It's drove me crazy, but what happens is that ph_macroparmret() returns when the called macro terminates - the problem is that waiting terminates the macro and schedules it to restart later so ph_macroparmret() returns as soon as the macro start to wait for the signal.
I can't use delay instead of wait, because the ties up powerhome so the socket trigger never gets services.
Any thoughts on how I can synchronize the two macros over the web?
The only solution I've come up with is way to messy - Have the html page call the first macro, then poll (refresh) the data from the second macro until it is complete. Yuck.
Thanks for your ideas...
Tony (Not No)
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dhoward
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| Posted: October 30 2008 at 13:17 | IP Logged
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Tony,
Ive been trying to think of a good way to do this and really don't see a way (without at least suspending the execution queue...PH won't be hung though like with a Delay). It's primarily because the webserver is not running in it's own separate thread and requests are processed through the execution queue like other commands.
How are you sending and receiving data to the socket? ph_sendsocketdata? There are some new functions that may help out. ph_sendsocketdata1 adds a "flags" parameter that gives you some control over when the function returns. There is also a raw Socket plugin now (this does run in it's own thread) and commands to plugins include a timeout parameter. You may be able to rewrite to use the socket plugin and instead of using the macro with a "Wait", use the ph_picmd function with a timeout to retrieve the data. You should be able to make this function wait until the data is returned and then have the webpage rendered. The only problem is that while PH won't be "hung", it won't process any execution queue items until the ph_picmd function returns or times out.
Not sure if this helps or not.
Dave.
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onhiatus
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Joined: May 12 2004
Location: United States
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Posts: 279
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| Posted: October 30 2008 at 17:39 | IP Logged
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I'm using the plug in to try to reduce the load on the main ph thread.
The socket plugin timeout seems only to affect when the data is sent - not when the reply comes back (this can be up to a minute later in my application)
What command to retrieve data? Using the raw socket plug in the only way I see to retrieve data is via a trigger. Am I missing something?
Thanks, Tony
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dhoward
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| Posted: November 04 2008 at 11:07 | IP Logged
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Tony,
You've got it right then. I wasnt aware you were using the Socket plugin. In that case, you may want to try the ph_sendsocketdata1 function but if it takes up to a minute before the socket returns the data, that is an awful long time to wait.
Dave.
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Topic: Wait and ph_macropramret issues
