Checking on a thread remove from list

Question

I have a thread which extends Thread  The code looks a little like this   class MyThread Thread       def run self             Do stuff  my threads      while has jobs   and len my threads   lt  5      new thread   MyThread next job details        new thread run       my threads append new thread   for my thread in my threads     my thread join         Do stuff   So here in my pseudo code I check to see if there is any jobs  like a db etc  and if there is some jobs  and if there is less than 5 threads running  create new threads   So from here  I then check over my threads and this is where I get stuck  I can use  join   but my understanding is that - this then waits until it s finished so if the first thread it checks is still in progress  it then waits till it s done - even if the other threads are finished      so is there a way to check if a thread is done  then remove it if so   eg  for my thread in my threads      if my thread done              process results         del  my threads my thread      will that work

User · Answer

The answer has been covered  but for simplicity       To filter out finished threads threads    t for t in threads if t is alive       Same thing but for QThreads  if you are using PyQt  threads    t for t in threads if t isRunning

User · Answer

mythreads   threading enumerate     Enumerate returns a list of all Thread objects still alive  https   docs python org 3 6 library threading html

User · Answer

As TokenMacGuy says  you should use thread is alive   to check if a thread is still running  To remove no longer running threads from your list you can use a list comprehension  for t in my threads      if not t is alive              get results from thread         t handled   True my threads    t for t in my threads if not t handled   This avoids the problem of removing items from a list while iterating over it

User · Answer

Better way is to use Queue class  http   docs python org library queue html  Look at the good example code in the bottom of documentation page   def worker        while True          item   q get           do work item          q task done    q   Queue   for i in range num worker threads        t   Thread target worker       t daemon   True      t start    for item in source        q put item   q join           block until all tasks are done

User · Answer

you need to call thread isAlive  to find out if the thread is still running

[python] Checking on a thread / remove from list

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