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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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8
Kernel/Devices/SB16.cpp
View file

@ -49,7 +49,6 @@ static SB16* s_the;
SB16::SB16()
: IRQHandler(5)
, CharacterDevice(42, 42) // ### ?
, m_interrupt_alarm(*this)
{
s_the = this;
initialize();
@ -144,7 +143,7 @@ void SB16::wait_for_irq()
#ifdef SB16_DEBUG
kprintf("SB16: waiting for interrupt...\n");
#endif
current->snooze_until(m_interrupt_alarm);
current->block_until([this] { return m_interrupted; });
#ifdef SB16_DEBUG
kprintf("SB16: got interrupt!\n");
#endif
@ -195,8 +194,3 @@ ssize_t SB16::write(FileDescription&, const u8* data, ssize_t length)
wait_for_irq();
return length;
}
bool SB16InterruptAlarm::is_ringing() const
{
return m_device.got_interrupt({});
}

17
Kernel/Devices/SB16.h
View file

@ -1,7 +1,6 @@
#pragma once
#include <AK/CircularQueue.h>
#include <Kernel/Alarm.h>
#include <Kernel/Devices/CharacterDevice.h>
#include <Kernel/IRQHandler.h>
#include <Kernel/VM/PhysicalAddress.h>
@ -9,18 +8,6 @@
class SB16;
class SB16InterruptAlarm final : public Alarm {
public:
SB16InterruptAlarm(SB16& device)
: m_device(device)
{
}
virtual bool is_ringing() const override;
private:
SB16& m_device;
};
class SB16 final : public IRQHandler
, public CharacterDevice {
public:
@ -35,8 +22,6 @@ public:
virtual ssize_t write(FileDescription&, const u8*, ssize_t) override;
virtual bool can_write(FileDescription&) const override { return true; }
bool got_interrupt(Badge<SB16InterruptAlarm>) const { return m_interrupted; }
private:
// ^IRQHandler
virtual void handle_irq() override;
@ -54,6 +39,4 @@ private:
RefPtr<PhysicalPage> m_dma_buffer_page;
bool m_interrupted { false };
int m_major_version { 0 };
SB16InterruptAlarm m_interrupt_alarm;
};