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GeezerVison is showing github.com — gh-158194: Exercise type freezing in concurrent setattr deadlock test… · orsenthil/cpython@769222a

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- test_type.py

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`‎Lib/test/test_free_threading/test_type.py‎`

Copy file name to clipboardExpand all lines: Lib/test/test_free_threading/test_type.py

+11-1Lines changed: 11 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -375,6 +375,7 @@ def test_concurrent_setattr_deadlock(self):`
`375`	`375`	`# dict mutex and waited for the type lock.`
`376`	`376`	`# This is fairly difficult to trigger the race but this N seems to do`
`377`	`377`	`# it at least sometimes.`
	`378`	`+ type_freeze = import_helper.import_module("_testlimitedcapi").type_freeze`
`378`	`379`	`N = 200`
`379`	`380`	`done = False`
`380`	`381`
`@@ -401,6 +402,15 @@ def lister():`
`401`	`402`	`while not done:`
`402`	`403`	`Base.__subclasses__()`
`403`	`404`
	`405`	`+ def freezer():`
	`406`	`+ # gh-158194: Exercise type freezing concurrently with slot`
	`407`	`+ # updates and competing stop-the-world requests.`
	`408`	`+ barrier.wait()`
	`409`	`+ for _ in range(10):`
	`410`	`+ class Frozen:`
	`411`	`+ pass`
	`412`	`+ type_freeze(Frozen)`
	`413`	`+`
`404`	`414`	`def basesetter():`
`405`	`415`	`nonlocal done`
`406`	`416`	`barrier.wait()`
`@@ -418,7 +428,7 @@ class B(A):`
`418`	`428`	`# to keep the type lock and the stop-the-world mutex contended, which`
`419`	`429`	`# is what gets the setters into the window where it happens.`
`420`	`430`	`targets = (setter, setter, subclasser, subclasser,`
`421`		`- lister, lister, basesetter)`
	`431`	`+ lister, lister, basesetter, freezer)`
`422`	`432`	`barrier = threading.Barrier(len(targets))`
`423`	`433`	`threads = [Thread(target=target) for target in targets]`
`424`	`434`	`with threading_helper.start_threads(threads):`

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