mirror of
https://gitlab.os-k.eu/os-k-team/os-k.git
synced 2023-08-25 14:03:10 +02:00
420 lines
12 KiB
C
420 lines
12 KiB
C
//----------------------------------------------------------------------------//
|
|
// GNU GPL OS/K //
|
|
// //
|
|
// Desc: Process scheduler //
|
|
// //
|
|
// //
|
|
// Copyright © 2018-2019 The OS/K Team //
|
|
// //
|
|
// This file is part of OS/K. //
|
|
// //
|
|
// OS/K is free software: you can redistribute it and/or modify //
|
|
// it under the terms of the GNU General Public License as published by //
|
|
// the Free Software Foundation, either version 3 of the License, or //
|
|
// any later version. //
|
|
// //
|
|
// OS/K is distributed in the hope that it will be useful, //
|
|
// but WITHOUT ANY WARRANTY//without even the implied warranty of //
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the //
|
|
// GNU General Public License for more details. //
|
|
// //
|
|
// You should have received a copy of the GNU General Public License //
|
|
// along with OS/K. If not, see <https://www.gnu.org/licenses/>. //
|
|
//----------------------------------------------------------------------------//
|
|
|
|
#include <extras/list.h>
|
|
#include <kernel/proc.h>
|
|
#include <kernel/sched.h>
|
|
#include <kernel/iomisc.h>
|
|
|
|
//
|
|
// For test purpose only
|
|
//
|
|
int procslen = 10;
|
|
Process_t procs[] = {
|
|
{ 0, 0, 0, 12, 12, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 1, 2, 2, 16, 16, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 2, 3, 3, 31, 31, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 3, 2, 2, 1, 1, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 4, 3, 3, 5, 5, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 5, 0, 0, 30, 30, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 6, 1, 1, 19, 19, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 7, 1, 1, 0, 0, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 8, 3, 3, 12, 12, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
{ 9, 2, 2, 21, 21, STATE_RUNNABLE, DEF_PROC_TSLICE, DEF_PROC_TSLICE, NULL },
|
|
};
|
|
|
|
//------------------------------------------//
|
|
|
|
#define ReSchedFlag (KeCurCPU->needReSched)
|
|
#define PreemptCount (KeCurCPU->preemptCount)
|
|
|
|
#define IdlePrioProcs (KeCurCPU->idlePrioProcs)
|
|
#define ReglPrioProcs (KeCurCPU->reglPrioProcs)
|
|
#define ServPrioProcs (KeCurCPU->servPrioProcs)
|
|
#define TimeCritProcs (KeCurCPU->timeCritProcs)
|
|
|
|
//------------------------------------------//
|
|
|
|
//
|
|
// Set current process
|
|
//
|
|
static void SetCurProc(Process_t *proc)
|
|
{
|
|
PsCurProc = proc;
|
|
if (PsCurProc) PsCurProc->procState = STATE_RUNNING;
|
|
}
|
|
|
|
//
|
|
// (Un)Lock priority class list heads
|
|
//
|
|
|
|
static inline
|
|
void PsLockSched(void) {
|
|
KeDisableIRQs();
|
|
}
|
|
|
|
static inline
|
|
void PsUnlockSched(void) {
|
|
//KeEnableIRQs();
|
|
}
|
|
|
|
//
|
|
// The four priority classes of OS/2
|
|
//
|
|
|
|
const char *PsPrioClassesNames[] = {
|
|
"Time-critical class",
|
|
"Server priority class",
|
|
"Regular priority class",
|
|
"Idle priority class",
|
|
};
|
|
|
|
//
|
|
// Get priority class list head
|
|
//
|
|
static ListHead_t *GetPrioClassHead(int prioClass)
|
|
{
|
|
switch (prioClass) {
|
|
case TIME_CRIT_PROC: return TimeCritProcs;
|
|
case SERV_PRIO_PROC: return ServPrioProcs;
|
|
case REGL_PRIO_PROC: return ReglPrioProcs;
|
|
case IDLE_PRIO_PROC: return IdlePrioProcs;
|
|
default: KalAssert(FALSE && "Unknown priority class");
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
//
|
|
// Determine which process is going to run first
|
|
// Return NULL for "equal" processes
|
|
//
|
|
static Process_t *CompareProcs(Process_t *proc1, Process_t *proc2)
|
|
{
|
|
KalAssert(proc1 && proc2);
|
|
|
|
if (proc1->prioClass < proc2->prioClass) return proc1;
|
|
if (proc1->prioClass > proc2->prioClass) return proc2;
|
|
|
|
if (proc1->prioLevel > proc2->prioLevel) return proc1;
|
|
if (proc1->prioLevel < proc2->prioLevel) return proc2;
|
|
|
|
return NULL; // same class and level
|
|
}
|
|
|
|
//
|
|
// Add process to schedule lists (unlocked)
|
|
//
|
|
static void SchedThisProcUnlocked(Process_t *proc)
|
|
{
|
|
KalAssert(proc && proc->procState == STATE_RUNNABLE && !proc->schedNode);
|
|
|
|
bool found = 0;
|
|
ListNode_t *iterNode = NULL;
|
|
ListNode_t *procNode = ExCreateNode(proc);
|
|
ListHead_t *head = GetPrioClassHead(proc->prioClass);
|
|
|
|
KalAssert(head);
|
|
KalAssert(procNode);
|
|
|
|
proc->schedNode = procNode;
|
|
|
|
// Find a process with lesser priority
|
|
for (iterNode = head->first; iterNode; iterNode = iterNode->next) {
|
|
if (proc->prioLevel > ExGetNodeData(iterNode, Process_t *)->prioLevel) {
|
|
// Detect double insertions
|
|
KalAssert(proc->pid != ExGetNodeData(iterNode, Process_t *)->pid);
|
|
|
|
// Add process to schedule
|
|
ExAddNodeBefore(head, iterNode, procNode);
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
|
|
// Didn't find any process with lesser priority
|
|
if (found == false) {
|
|
ExAppendNode(head, procNode);
|
|
}
|
|
}
|
|
|
|
//
|
|
// Add process to schedule lists
|
|
//
|
|
void PsSchedThisProc(Process_t *proc)
|
|
{
|
|
PsLockSched();
|
|
|
|
SchedThisProcUnlocked(proc);
|
|
|
|
PsUnlockSched();
|
|
}
|
|
|
|
//
|
|
// Selects process to schedule next
|
|
//
|
|
static Process_t *SelectSchedNext(void)
|
|
{
|
|
if (TimeCritProcs->length > 0)
|
|
return ExGetNodeData(TimeCritProcs->first, Process_t *);
|
|
|
|
if (ServPrioProcs->length > 0)
|
|
return ExGetNodeData(ServPrioProcs->first, Process_t *);
|
|
|
|
if (ReglPrioProcs->length > 0)
|
|
return ExGetNodeData(ReglPrioProcs->first, Process_t *);
|
|
|
|
if (IdlePrioProcs->length > 0)
|
|
return ExGetNodeData(IdlePrioProcs->first, Process_t *);
|
|
|
|
return NULL;
|
|
}
|
|
|
|
//
|
|
// Remove running process from schedule lists
|
|
// and schedule next runnable process
|
|
//
|
|
void PsBlockCurProc(void)
|
|
{
|
|
KalAssert(PsCurProc && PsCurProc->procState == STATE_RUNNING);
|
|
|
|
ListNode_t *procNode = PsCurProc->schedNode;
|
|
|
|
KalAssert(procNode && "Blocking non-scheduled process");
|
|
|
|
PsCurProc->procState = STATE_BLOCKED;
|
|
ExRemoveNode(procNode->head, procNode);
|
|
|
|
PsCurProc->schedNode = NULL;
|
|
SetCurProc(SelectSchedNext());
|
|
}
|
|
|
|
static void ReSchedCurProc(void)
|
|
{
|
|
KalAssert(PsCurProc && PsCurProc->procState == STATE_RUNNING);
|
|
KalAssert(PsCurProc->schedNode);
|
|
|
|
// Restore default attributes, cancelling boosts
|
|
PsCurProc->prioClass = PsCurProc->defPrioClass;
|
|
PsCurProc->prioLevel = PsCurProc->defPrioLevel;
|
|
PsCurProc->timeSlice = PsCurProc->defTimeSlice;
|
|
PsCurProc->procState = STATE_RUNNABLE;
|
|
|
|
// Remove from list
|
|
ExRemoveNode(PsCurProc->schedNode->head, PsCurProc->schedNode);
|
|
PsCurProc->schedNode = NULL;
|
|
|
|
// Schedule again, with default attributes now
|
|
SchedThisProcUnlocked(PsCurProc);
|
|
}
|
|
|
|
//
|
|
// Should we schedule another process?
|
|
// Called at each tick
|
|
//
|
|
void PsSchedOnTick(void)
|
|
{
|
|
PsLockSched();
|
|
|
|
Process_t *procNext, *winner, *previous = PsCurProc;
|
|
|
|
// We're either idle or running something
|
|
KalAssert(PsCurProc == NULL || PsCurProc->procState == STATE_RUNNING);
|
|
|
|
// Have the current process spent its timeslice?
|
|
// (To be handled in CPU decisions function)
|
|
if (PsCurProc != NULL) {
|
|
if (PsCurProc->timeSlice <= 1) {
|
|
// Re-schedule
|
|
ReSchedCurProc();
|
|
|
|
// See next 'if' statement
|
|
PsCurProc = NULL;
|
|
}
|
|
|
|
// Otherwise, make it lose a tick
|
|
else {
|
|
PsCurProc->timeSlice--;
|
|
}
|
|
}
|
|
|
|
// Are we idle, or scheduling next process?
|
|
if (PsCurProc == NULL) {
|
|
SetCurProc(SelectSchedNext());
|
|
goto leave;
|
|
}
|
|
|
|
// Is preemption on and a re-schedule is needed?
|
|
if (PreemptCount == PREEMPT_ON && ReSchedFlag) {
|
|
|
|
// Is there a higher priority process that is runnable?
|
|
procNext = SelectSchedNext();
|
|
winner = CompareProcs(PsCurProc, procNext);
|
|
|
|
// Yes, procNext should preempt current process
|
|
if (winner == procNext) {
|
|
// Re-schedule
|
|
ReSchedCurProc();
|
|
|
|
// Switch to procNext
|
|
SetCurProc(procNext);
|
|
}
|
|
}
|
|
|
|
// Current process won't be preempted and has time remaining
|
|
leave:
|
|
PsUnlockSched();
|
|
|
|
if (PsCurProc != NULL && PsCurProc != previous) {
|
|
// dispatch & context switch
|
|
}
|
|
}
|
|
|
|
//
|
|
// Initialize scheduler
|
|
//
|
|
void PsInitSched(void)
|
|
{
|
|
int pid;
|
|
|
|
PsLockSched();
|
|
|
|
TimeCritProcs = ExCreateListHead();
|
|
ServPrioProcs = ExCreateListHead();
|
|
ReglPrioProcs = ExCreateListHead();
|
|
IdlePrioProcs = ExCreateListHead();
|
|
|
|
KalAssert(IdlePrioProcs && ReglPrioProcs && ServPrioProcs && TimeCritProcs);
|
|
|
|
for (pid = 0; pid < procslen; pid++) {
|
|
if (procs[pid].procState == STATE_RUNNABLE) {
|
|
SchedThisProcUnlocked(&procs[pid]);
|
|
}
|
|
}
|
|
|
|
PsUnlockSched();
|
|
}
|
|
|
|
//
|
|
// Shutdowns scheduler
|
|
//
|
|
void PsFiniSched(void)
|
|
{
|
|
KalAssert(IdlePrioProcs && ReglPrioProcs && ServPrioProcs && TimeCritProcs);
|
|
|
|
PsLockSched();
|
|
|
|
while (IdlePrioProcs->length > 0)
|
|
ExRemoveNode(IdlePrioProcs, IdlePrioProcs->first);
|
|
|
|
while (ReglPrioProcs->length > 0)
|
|
ExRemoveNode(ReglPrioProcs, ReglPrioProcs->first);
|
|
|
|
while (ServPrioProcs->length > 0)
|
|
ExRemoveNode(ServPrioProcs, ServPrioProcs->first);
|
|
|
|
while (TimeCritProcs->length > 0)
|
|
ExRemoveNode(TimeCritProcs, TimeCritProcs->first);
|
|
|
|
ExDestroyListHead(IdlePrioProcs); IdlePrioProcs = NULL;
|
|
ExDestroyListHead(ReglPrioProcs); ReglPrioProcs = NULL;
|
|
ExDestroyListHead(ServPrioProcs); ServPrioProcs = NULL;
|
|
ExDestroyListHead(TimeCritProcs); TimeCritProcs = NULL;
|
|
|
|
PsUnlockSched();
|
|
}
|
|
|
|
#define PrintProc(proc) KernLog("{ %d, '%s', %d , %lu}\n", (proc)->pid, \
|
|
PsPrioClassesNames[(proc)->prioClass], (proc)->prioLevel, (proc)->timeSlice);
|
|
//
|
|
// Print out process list
|
|
//
|
|
void PrintList(ListHead_t *head)
|
|
{
|
|
KalAssert(head);
|
|
|
|
Process_t *proc;
|
|
ListNode_t *node = head->first;
|
|
|
|
KernLog("len: %lu\n", head->length);
|
|
|
|
while (node) {
|
|
proc = ExGetNodeData(node, Process_t *);
|
|
|
|
PrintProc(proc);
|
|
|
|
node = node->next;
|
|
}
|
|
|
|
KernLog("");
|
|
}
|
|
|
|
void pstest(void)
|
|
{
|
|
KernLog("\nTime Critical: ");
|
|
PrintList(TimeCritProcs);
|
|
|
|
KernLog("\nServer: ");
|
|
PrintList(ServPrioProcs);
|
|
|
|
KernLog("\nRegular: ");
|
|
PrintList(ReglPrioProcs);
|
|
|
|
KernLog("\nIdle: ");
|
|
PrintList(IdlePrioProcs);
|
|
|
|
int tick = 0;
|
|
|
|
while (tick < 14) {
|
|
//if (tick%25==0)ClearTerm(StdOut);
|
|
if (tick > 0 && tick != 50 && tick % 10 == 0) {
|
|
KernLog("Blocking current process\n");
|
|
PsBlockCurProc();
|
|
}
|
|
|
|
if (tick == 50) {
|
|
procs[0].procState = STATE_RUNNABLE;
|
|
PsSchedThisProc(&procs[0]);
|
|
}
|
|
|
|
KernLog("Tick %d - Running: ", tick);
|
|
|
|
if (PsCurProc == NULL) {
|
|
KernLog("IDLE\n");
|
|
}
|
|
|
|
else {
|
|
PrintProc(PsCurProc);
|
|
}
|
|
|
|
PsSchedOnTick();
|
|
|
|
if (tick == 50) // already done
|
|
KernLog("Re-scheduling process 0\n");
|
|
|
|
tick++;
|
|
}
|
|
}
|
|
|