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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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7
Kernel/Scheduler.cpp
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@ -1,5 +1,4 @@
#include <AK/TemporaryChange.h>
#include <Kernel/Alarm.h>
#include <Kernel/Arch/i386/PIT.h>
#include <Kernel/Devices/PCSpeaker.h>
#include <Kernel/FileSystem/FileDescription.h>
@ -159,9 +158,9 @@ bool Scheduler::pick_next()
return IterationDecision::Continue;
}
if (thread.state() == Thread::BlockedSnoozing) {
if (thread.m_snoozing_alarm->is_ringing()) {
thread.m_snoozing_alarm = nullptr;
if (thread.state() == Thread::BlockedCondition) {
if (thread.m_block_until_condition()) {
thread.m_block_until_condition = nullptr;
thread.unblock();
}
return IterationDecision::Continue;