Description:
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I would like to run to requests in parallel in the same session, i.e. have two instances of a php script run simultaneously.

To demonstrate, please see the attached code (it will print 60 | chars with a second in between):

Next, simply open two tabs in your browser and call the script from both tabs.

If it is working as I hope, you will notice that they will not run in parallel (as I was hoping), but instead the script will start executing in one of the tabs, while the other will appear to hang. After the script in this tabs finishes (after one minute), the next tab will start executing.

I have tried different approaches for achieving explicit locking, mainly using session_set_save_handler (http://theserverpages.com/php/manual/en/function.session-set-save-handler.php), but to no effect - the locking is effective no matter what I come up with.

These are some pages that mention solutions for explicit locking, but none appear effective:

- http://thwartedefforts.org/2006/11/11/race-conditions-with-ajax-and-php-sessions/

- http://www.tonymarston.co.uk/php-mysql/client-clones.html

- http://blog.perplexedlabs.com/2009/10/05/php-custom-session-handler/

So, it appears to me that session_set_save_handler() is buggy - or am I just naively hoping it will work for me for a purpose it doesn't support?


Test script:
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<?php
print "[";

for($i = 0; $i < 100; $i++){
  $spaces.="<!-- bufferme -->";
} // for

//and then

for($i = 0; $i < 60; $i++){
  for($ii = 0; $ii < 200000; $ii++){
    //do something slow here
  } // for
  sleep(1);
  print "$spaces|";
  flush();
} // for

print "]";

?>

Expected result:
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Both scripts running in parallel.

Actual result:
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Scripts executing one at a time.