CODEWITHSUNDEEP
phpmultithreadingsegmentation-faultpthreads
MinecraftShamrock
MinecraftShamrock

Reputation: 3574

Why would this example segfault?

I noticed in this example an annotation that $this->rows[]=$row; in row 15 would segfault. But I don't understand why. Could someone please explain this to me?

Upvotes: 0

Views: 104

Answers (2)

Joe Watkins
Joe Watkins

Reputation: 17168

It will either fault, or behave unexpectedly (current versions should not fault).

The reason is that the member $this->rows is not a thread safe array, its a normal array.

Normal arrays are serialized for storage as a member of the object, so

$this->array[] = $row;

Doesn't make sense; You cannot append onto a serialized array.

In the example, it builds $rows in the method scope and sets the object member at once with $this->rows = $rows;.

A thread safe array, which is a Threaded object (they all behave like arrays and come with some sensible manipulation methods such as pop and shift), does not have the same limitation.

Upvotes: 3

3ICE
3ICE

Reputation: 74

According to the Blame tool over at Github, We should try paging Joe Watkins (@krakjoe)...

Edit: On my own, an "out of memory" error is the best idea I can come up with. (Googled the line in question, only useful result was about low memory limit)

Upvotes: 0

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