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Kernel: disown should unblock any potential waiters

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This is necessary because if a process changes the state to Stopped
or resumes from that state, a wait entry is created in the parent
process. So, if a child process does this before disown is called,
we need to clear those entries to avoid leaking references/zombies
that won't be cleaned up until the former parent exits.

This also should solve an even more unlikely corner case where another
thread is waiting on a pid that is being disowned by another thread.
This commit is contained in:
Tom 2020-12-08 19:04:05 -07:00 • committed by Andreas Kling
parent bcb9363a97
commit 4bbee00650
5 changed files with 55 additions and 1 deletions
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Kernel/Process.h
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@ -488,6 +488,7 @@ public:
KResultOr<u32> peek_user_data(Userspace<const u32*> address);
KResult poke_user_data(Userspace<u32*> address, u32 data);
void disowned_by_waiter(Process& process);
void unblock_waiters(Thread&, Thread::WaitBlocker::UnblockFlags, u8 signal = 0);
Thread::WaitBlockCondition& wait_block_condition() { return m_wait_block_condition; }