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Red Hat Bugzilla – Attachment 703925 Details for
Bug 916562
'createrepo -v' deadlocks on large repositories
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Small exaple on how select and readline can still deadlock
tmp.py (text/x-python), 942 bytes, created by
Anders Blomdell
on 2013-02-28 16:40:14 UTC
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Description:
Small exaple on how select and readline can still deadlock
Filename:
MIME Type:
Creator:
Anders Blomdell
Created:
2013-02-28 16:40:14 UTC
Size:
942 bytes
patch
obsolete
>#! /usr/bin/python > >import select >import threading >import os >import time > >def producer(f1, f2): > print>>f1,'File f1', > print>>f2,'File f2', > for n in range(10): > print "Producer",n > print>>f1,"%d %-65536.65536s" % (n, "This will block 1") > print>>f2,"%d %-65536.65536s" % (n, "This will block 2") > time.sleep(1000) > pass > >if __name__ == '__main__': > r1,w1 = os.pipe() > r2,w2 = os.pipe() > r1 = os.fdopen(r1) > r2 = os.fdopen(r2) > t1 = threading.Thread(target=producer, > args=((os.fdopen(w1, 'w'), os.fdopen(w2, 'w')))) > t1.daemon =True > t1.start() > while True: > readable,_,_ = select.select([r1, r2],[],[], 1) > print readable > time.sleep(0.1) > if r1 in readable: > print "Reading r1" > print len(r1.readline()) > if r2 in readable: > print "Reading r2" > print len(r2.readline())
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