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Kernel: Kill user mode threads that are marked to die

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Threads that don't make syscalls still need to be killed, and we can
do that at any time we want so long the thread is in user mode and
not somehow blocked (e.g. page fault).
This commit is contained in:
Tom 2021-07-13 11:44:30 -06:00 committed by Andreas Kling
parent fa8fe40266
commit b919789db2
Notes: sideshowbarker 2024-07-19 01:59:31 +09:00 
Author: https://github.com/tomuta
Commit: https://github.com/SerenityOS/serenity/commit/b919789db24
Pull-request: https://github.com/SerenityOS/serenity/pull/8728
Reviewed-by: https://github.com/gunnarbeutner ✅
1 changed files with 10 additions and 0 deletions
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10
Kernel/Scheduler.cpp
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@ -443,6 +443,16 @@ void Scheduler::timer_tick(const RegisterState& regs)
return; // TODO: This prevents scheduling on other CPUs!
#endif
if (current_thread->previous_mode() == Thread::PreviousMode::UserMode && current_thread->should_die() && !current_thread->is_blocked()) {
dbgln_if(SCHEDULER_DEBUG, "Scheduler[{}]: Terminating user mode thread {}", Processor::id(), *current_thread);
{
ScopedSpinLock scheduler_lock(g_scheduler_lock);
current_thread->set_state(Thread::Dying);
}
VERIFY(!Processor::current().in_critical());
Processor::current().invoke_scheduler_async();
return;
}
if (current_thread->tick())
return;