Broken counter

[•Cosmin]

http://infoarena.ro/blog/counter

[•marius135]

eu votez 10 in baza 2 sau 10 pastrez suspans

[•blue_phoenix]

deci... intrebarea e care e numarul maxim de coliziuni care pot aparea? (coliziune= moment in care doua sau mai multe fire incearca sa incrementeze variabila in aproape acelasi timp; daca asta se intampla variabila va fi incrementata numai de un fir, si anume de primul, sau nu va fi incrementata deloc? );

[•Prostu]

The fact that you chose python for this code is very confusing to me.

[•Cosmin]

Think of it as a pseudocode example, instead of Python if that makes it less confusing .

Python threading sucks but the code is somewhat shorter than a Java equivalent.

[•Cosmin]

@t3st your example has a small bug.

[•raduberinde]

2:
Thread 1 reads value 0
Thread 2 does 9 iterations, thread 3-5 all their 10 iterations (the ordering doesn't matter)
Thread 1 writes value 1
Thread 2 reads value 1
Thread 1 reads and writes etc until it completes all its iterations
Thread 2 writes value 2

Basically what t3st said, he was just missing "thread 1 completes the rest of the iterations" before thread 2 does the final write.

[•Cosmin]

As Radu and others have said the answer is 2.

[•Cosmin]

Radu, I've tried with more threads and more increments and you start seeing interesting numbers even if Python uses GIL.