Commitc2202a7

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gh-109263: Start process from spawn context in multiprocessing no longer have side effect (GH-135813)

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+23

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+23

-1

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Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -184,7 +184,7 @@ def get_preparation_data(name):`
`184`	`184`	`sys_argv=sys.argv,`
`185`	`185`	`orig_dir=process.ORIGINAL_DIR,`
`186`	`186`	`dir=os.getcwd(),`
`187`		`-start_method=get_start_method(),`
	`187`	`+start_method=get_start_method(allow_none=True),`
`188`	`188`	`)`
`189`	`189`
`190`	`190`	`# Figure out whether to initialise main in the subprocess as a module`

Lines changed: 20 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -5967,6 +5967,26 @@ def test_context(self):`
`5967`	`5967`	`self.assertRaises(ValueError,ctx.set_start_method,None)`
`5968`	`5968`	`self.check_context(ctx)`
`5969`	`5969`
	`5970`	`+@staticmethod`
	`5971`	`+def_dummy_func():`
	`5972`	`+pass`
	`5973`	`+`
	`5974`	`+@warnings_helper.ignore_fork_in_thread_deprecation_warnings()`
	`5975`	`+deftest_spawn_dont_set_context(self):`
	`5976`	`+# Run a process with spawn or forkserver context may change`
	`5977`	`+# the global start method, see gh-109263.`
	`5978`	`+formethodin ('fork','spawn','forkserver'):`
	`5979`	`+multiprocessing.set_start_method(None,force=True)`
	`5980`	`+`
	`5981`	`+try:`
	`5982`	`+ctx=multiprocessing.get_context(method)`
	`5983`	`+exceptValueError:`
	`5984`	`+continue`
	`5985`	`+process=ctx.Process(target=self._dummy_func)`
	`5986`	`+process.start()`
	`5987`	`+process.join()`
	`5988`	`+self.assertIsNone(multiprocessing.get_start_method(allow_none=True))`
	`5989`	`+`
`5970`	`5990`	`deftest_context_check_module_types(self):`
`5971`	`5991`	`try:`
`5972`	`5992`	`ctx=multiprocessing.get_context('forkserver')`

Lines changed: 2 additions & 0 deletions

Original file line number	Diff line number	Diff line change
`@@ -0,0 +1,2 @@`
	`1`	+Starting a process from spawn context in:mod:`multiprocessing` no longer
	`2`	`+sets the start method globally.`

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