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Added/Updated tests\bugs\core_0214_test.py: Resultset of cursor that executes using instance of selectable PreparedStatement must be stored in some variable in order to have ability close it EXPLICITLY, before PS will be freed. Otherwise access violation can raises when Python runs garbage collection.

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pavel-zotov 2025-01-18 14:26:04 +03:00
parent 213f3a472f
commit 43524fadea
1 changed files with 16 additions and 1 deletions
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tests/bugs/core_0214_test.py
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@ -36,6 +36,13 @@ NOTES:
[03.12.2024] pzotov
Made MAX_RATIO different for Windows vs Linux. Increased its value on Linux: in some cases it can be more than 2.33
[18.01.2025] pzotov
Resultset of cursor that executes using instance of selectable PreparedStatement must be stored
in some variable in order to have ability close it EXPLICITLY (before PS will be freed).
Otherwise access violation raises during Python GC and pytest hangs at final point (does not return control to OS).
This occurs at least for: Python 3.11.2 / pytest: 7.4.4 / firebird.driver: 1.10.6 / Firebird.Qa: 0.19.3
The reason of that was explained by Vlad, 26.10.24 17:42 ("oddities when use instances of selective statements").
"""
import os
import psutil
@ -218,9 +225,17 @@ def test_1(act: Action, capsys):
psc = ps1 if c == cur1 else ps2
for i in range(0, N_MEASURES):
fb_info_init = psutil.Process(fb_pid).cpu_times()
# ::: NB ::: 'psc' returns data, i.e. this is SELECTABLE expression.
# We have to store result of cur.execute(<psInstance>) in order to
# close it explicitly.
# Otherwise AV can occur during Python garbage collection and this
# causes pytest to hang on its final point.
# Explained by hvlad, email 26.10.24 17:42
rs = c.execute(psc)
c.fetchall()
rs.close()
rs.close() # <<< EXPLICITLY CLOSING CURSOR RESULTS
fb_info_curr = psutil.Process(fb_pid).cpu_times()
cpu_usage_values.append( max(fb_info_curr.user - fb_info_init.user, 0.000001) )