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76 lines
1.8 KiB
Python
76 lines
1.8 KiB
Python
"""
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A script to reproduce the race condition described in ticket #58
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from https://bugzilla.redhat.com/show_bug.cgi?id=711095
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Results in the error:
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python: Modules/gcmodule.c:277: visit_decref: Assertion `gc->gc.gc_refs != 0'
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failed.
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on unpatched library.
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"""
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import threading
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import gc
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import time
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import psycopg2
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from StringIO import StringIO
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done = 0
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class GCThread(threading.Thread):
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# A thread that sits in an infinite loop, forcing the garbage collector
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# to run
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def run(self):
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global done
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while not done:
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gc.collect()
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time.sleep(0.1) # give the other thread a chance to run
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gc_thread = GCThread()
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# This assumes a pre-existing db named "test", with:
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# "CREATE TABLE test (id serial PRIMARY KEY, num integer, data varchar);"
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conn = psycopg2.connect("dbname=test user=postgres")
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cur = conn.cursor()
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# Start the other thread, running the GC regularly
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gc_thread.start()
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# Now do lots of "cursor.copy_from" calls:
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print "copy_from"
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for i in range(1000):
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f = StringIO("42\tfoo\n74\tbar\n")
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cur.copy_from(f, 'test', columns=('num', 'data'))
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# Assuming the other thread gets a chance to run during this call, expect a
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# build of python (with assertions enabled) to bail out here with:
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# python: Modules/gcmodule.c:277: visit_decref: Assertion `gc->gc.gc_refs != 0' failed.
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# Also exercise the copy_to code path
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print "copy_to"
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cur.execute("truncate test")
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f = StringIO("42\tfoo\n74\tbar\n")
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cur.copy_from(f, 'test', columns=('num', 'data'))
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for i in range(1000):
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f = StringIO()
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cur.copy_to(f, 'test', columns=('num', 'data'))
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# And copy_expert too
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print "copy_expert"
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cur.execute("truncate test")
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for i in range(1000):
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f = StringIO("42\tfoo\n74\tbar\n")
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cur.copy_expert("copy test to stdout", f)
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# Terminate the GC thread's loop:
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done = 1
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cur.close()
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conn.close()
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