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Kernel: Fix Lock race causing infinite spinning between two threads

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We need to account for how many shared lock instances the current
thread owns, so that we can properly release such references when
yielding execution.

We also need to release the process lock when donating.
This commit is contained in:
Tom 2020-12-14 16:36:22 -07:00 • committed by Andreas Kling
parent 56701f91f9
commit c4176b0da1
10 changed files with 359 additions and 96 deletions
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3
Kernel/Syscalls/execve.cpp
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@ -348,7 +348,8 @@ int Process::do_exec(NonnullRefPtr<FileDescription> main_program_description, Ve
ScopedSpinLock lock(g_scheduler_lock);
new_main_thread->set_state(Thread::State::Runnable);
}
big_lock().force_unlock_if_locked();
u32 lock_count_to_restore;
(void)big_lock().force_unlock_if_locked(lock_count_to_restore);
ASSERT_INTERRUPTS_DISABLED();
ASSERT(Processor::current().in_critical());
return 0;