Usage of php multithreading.. about pthreads

[krakjoe]

Yes, I should think so. That is, if I understand you correctly and you have more than one PDF to stamp in a single request.

Start with the examples, all of them even if you think you are not interested in that particular part of multi-threading. They have advice too informal for the PHP manual. Then, there's the PHP manual, which is as much as makes no difference up to date ( at the moment ), and includes inline example for almost everything you need to use. Then when you have read all that, there's bug reports that have been filed and my responses, and solutions to them. After all that, there's me, feel free to contact me directly.

[Xebur13]

How can I contact you :) Sorry, a new github user here.. Couldn't found any way to send you message..

The system basically is:

function1 -> sends info to plugin1 -> receives info from plugin1 (function2 waits until function 1 finished this process)
function2 -> sends info to plugin2 -> receives info from plugin2 (function3 waits...)
..
..

I've 13 functions like that and it takes 3-4 seconds for the plugin to stamp each pdf file. So in total it takes 25-30 seconds and it's way too long.

[krakjoe]

You're contacting me now !!!

You can email pthreads at the pthreads website dot org too ...

[Xebur13]

if ($tarih_sql == true)
{
$urun_id = $db->VeriCek($Id, 'siparisler', 'urun_id');

                $pdf_url = $ykd->PdfGen($Id);

                $urun_pdf_url2 = $db->VeriCek($urun_id, 'urunler', 'pdf_url2');
                    if ($urun_pdf_url2 != '') { $pdf_url2 = $ykd->PdfGen2($Id, '0', '2'); $pdf_url_sql .= ", pdf_url2='$pdf_url2'"; }

                $urun_pdf_url3 = $db->VeriCek($urun_id, 'urunler', 'pdf_url3');
                    if ($urun_pdf_url3 != '') { $pdf_url3 = $ykd->PdfGen3($Id, '0', '3'); $pdf_url_sql .= ", pdf_url3='$pdf_url3'"; }

                $urun_pdf_url4 = $db->VeriCek($urun_id, 'urunler', 'pdf_url4');
                    if ($urun_pdf_url4 != '') { $pdf_url4 = $ykd->PdfGen4($Id, '0', '4'); $pdf_url_sql .= ", pdf_url4='$pdf_url4'"; }

                $urun_pdf_url5 = $db->VeriCek($urun_id, 'urunler', 'pdf_url5');
                    if ($urun_pdf_url5 != '') { $pdf_url5 = $ykd->PdfGen5($Id, '0', '5'); $pdf_url_sql .= ", pdf_url5='$pdf_url5'"; }

..
..
..

This is the sample of the code that causes delays. For the offline purchases if I click "approve" from the admin panel, it directly sends the first pdf the the PdfGen function (which is posting customer details to wordpress plugin, and receives the stamped pdf's url back)

The code controls in the "if statements" whether there is more than one pdf or not. If there's, it sends it to a different function PdfGen2 (that posts the info to a second plugin installed in another directory)

The problem is stamping in the plugin takes 3-4 second and each if statement waits that time to start controlling whether there is another pdf and if yes posting it to the plugin..

Can multithreading be used to send all the pdf's to the post functions at the same time? Without waiting each other to end? If yes, how?

[krakjoe]

Each function appears to depend on the last function having run.

[chibisuke]

It might be possible depending on the internals

from my understanding this part of the code:

                $urun_pdf_url2 = $db->VeriCek($urun_id, 'urunler', 'pdf_url2');
                    if ($urun_pdf_url2 != '') { $pdf_url2 = $ykd->PdfGen2($Id, '0', '2'); $pdf_url_sql .= ", pdf_url2='$pdf_url2'";

is not dependent on the runs of the others, so it could run in a thread. But in the end it depends on what $ykd is and how it works internally.

The simple rule to follow there is: you should not attemp to share a database connection or any other kind of resource. And since simple DB checks are usualy fast, you can just do all that checks before you spawn the threads.