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/*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include <AK/Assertions.h>
#include <AK/Function.h>
#include <AK/IntrusiveList.h>
#include <AK/Types.h>
#include <Kernel/UnixTypes.h>
namespace Kernel {
class Process;
class Thread;
class WaitQueue;
struct RegisterState;
struct SchedulerData;
extern Thread* g_finalizer;
extern Thread* g_colonel;
extern WaitQueue* g_finalizer_wait_queue;
extern bool g_finalizer_has_work;
extern u64 g_uptime;
extern SchedulerData* g_scheduler_data;
extern timeval g_timeofday;
class Scheduler {
public:
static void initialize();
static void timer_tick(const RegisterState&);
static bool pick_next();
static timeval time_since_boot();
static void pick_next_and_switch_now();
static void switch_now();
static bool yield();
static bool donate_to(Thread*, const char* reason);
static bool context_switch(Thread&);
static void prepare_to_modify_tss(Thread&);
static Process* colonel();
static bool is_active();
static void beep();
static void idle_loop();
static void stop_idling();
template<typename Callback>
static inline IterationDecision for_each_runnable(Callback);
template<typename Callback>
static inline IterationDecision for_each_nonrunnable(Callback);
static void init_thread(Thread& thread);
static void update_state_for_thread(Thread& thread);
private:
static void prepare_for_iret_to_new_process();
};
}
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