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Kernel: Add Thread::block_until(Condition).

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Replace the class-based snooze alarm mechanism with a per-thread callback.
This makes it easy to block the current thread on an arbitrary condition:

    void SomeDevice::wait_for_irq() {
        m_interrupted = false;
        current->block_until([this] { return m_interrupted; });
    }
    void SomeDevice::handle_irq() {
        m_interrupted = true;
    }

Use this in the SB16 driver, and in NetworkTask :^)
This commit is contained in:
Andreas Kling 2019-07-14 14:51:54 +02:00
parent e8d61bb8c0
commit b2e502e533
8 changed files with 22 additions and 78 deletions
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10
Kernel/Thread.cpp
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@ -108,10 +108,10 @@ void Thread::unblock()
set_state(Thread::Runnable);
}
void Thread::snooze_until(Alarm& alarm)
void Thread::block_until(Function<bool()>&& condition)
{
m_snoozing_alarm = &alarm;
block(Thread::BlockedSnoozing);
m_block_until_condition = move(condition);
block(Thread::BlockedCondition);
Scheduler::yield();
}
@ -179,8 +179,8 @@ const char* to_string(Thread::State state)
return "Connect";
case Thread::BlockedReceive:
return "Receive";
case Thread::BlockedSnoozing:
return "Snoozing";
case Thread::BlockedCondition:
return "Condition";
case Thread::__Begin_Blocked_States__:
case Thread::__End_Blocked_States__:
break;