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Kernel: Add a blunt big process lock.

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We can't have multiple threads in the same process running in the kernel
at the same time, so let's have a per-process lock that threads have to
acquire on syscall entry/exit (and yield while blocked.)
This commit is contained in:
Andreas Kling 2019-04-01 20:02:05 +02:00
parent 54ea35703a
commit d5a9f4596b
5 changed files with 37 additions and 0 deletions
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3
Kernel/Thread.cpp
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@ -112,6 +112,7 @@ void Thread::snooze_until(Alarm& alarm)
void Thread::block(Thread::State new_state)
{
bool did_unlock = process().big_lock().unlock_if_locked();
if (state() != Thread::Running) {
kprintf("Thread::block: %s(%u) block(%u/%s) with state=%u/%s\n", process().name().characters(), process().pid(), new_state, to_string(new_state), state(), to_string(state()));
}
@ -120,6 +121,8 @@ void Thread::block(Thread::State new_state)
m_was_interrupted_while_blocked = false;
set_state(new_state);
Scheduler::yield();
if (did_unlock)
process().big_lock().lock();
}
void Thread::sleep(dword ticks)