[NetBSD] Process threads() and num_threads() keep listing dead threads

[giampaolo]

Summary

• OS: NetBSD
• Type: core

Description

======================================================================
FAIL: psutil.tests.test_process.TestProcess.test_threads
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Traceback (most recent call last):
  File "/home/vagrant/psutil/psutil/tests/test_process.py", line 538, in test_threads
    self.assertEqual(len(step2), len(step1) + 1)
AssertionError: 2 != 3

The test failure above indicates that after a thread is terminated Process.threads() keeps listing it as if it was alive. It took me a while to understand why that is. It turns out that some threads stick around even after terminated, and their status is either zombie or idle (LSZOMB, LSIDL). As such psutil should skip/ignore these threads.