1THREADGROUP_LOCK(9)              Driver Basics             THREADGROUP_LOCK(9)
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NAME

6       threadgroup_lock - lock threadgroup
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SYNOPSIS

9       void threadgroup_lock(struct task_struct * tsk);
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ARGUMENTS

12       tsk
13           member task of the threadgroup to lock
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DESCRIPTION

16       Lock the threadgroup tsk belongs to. No new task is allowed to enter
17       and member tasks aren't allowed to exit (as indicated by PF_EXITING) or
18       change ->group_leader/pid. This is useful for cases where the
19       threadgroup needs to stay stable across blockable operations.
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21       fork and exit paths explicitly call threadgroup_change_{begin|end}()
22       for synchronization. While held, no new task will be added to
23       threadgroup and no existing live task will have its PF_EXITING set.
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25       de_thread does threadgroup_change_{begin|end}() when a non-leader
26       sub-thread becomes a new leader.
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29Kernel Hackers Manual 3.10         June 2019               THREADGROUP_LOCK(9)
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