selftests/futex: Provide thread creation and synchronization helpers

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There are timing issues in the use of threads in some selftests for futexes
as the tests rely on timed waits to ensure that the other test thread[s]
reached the lock wait function in the kernel.

That "works" on halfways idle systems, but fails under load which results
in tests failing.

Provide a set of helper functions to create test threads and to wait for
them to reach the lock wait by monitoring /proc/$PID/wchan.

[ tglx: Fixup coding style, move the timeout into the helper, adapt to test
  	harness changes and massage change log ]

Signed-off-by: Yuwen Chen <ywen.chen@foxmail.com>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/tencent_4C90BE98BBC48B38B9FBC6A95C45CF49F309@qq.com

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Yuwen Chen 2026-05-18 10:16:40 +08:00 • committed by Thomas Gleixner

parent 50c121e5a5

commit 6c4a1b9726

2 changed files with 119 additions and 1 deletions

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3

tools/testing/selftests/futex/functional/Makefile

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117

tools/testing/selftests/futex/include/futex_thread.h

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