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smp: cleanup Switch()

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This commit is contained in:
Edgaru089 2021-11-14 17:40:09 +08:00
parent 54f8aa54c1
commit 7e9cc76ec5
1 changed files with 7 additions and 18 deletions
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25
smp/kthread_switch.c
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@ -27,29 +27,22 @@ static void printTree(tree_Node *root, int level, __tree_ConnectType type) {
SYSV_ABI uintptr_t __smp_Switch() {
// the calling function smp_IntSwitch already CLI-ed for us
//io_Printf("__smp_Switch: Tick: %d, switching\n", __smp_Now);
__smp_Thread *t = __smp_Current[0];
uint64_t priority = UINT64_MAX;
// insert the current thread back into the waiting queue
if (t)
priority = t->nice + (t->lastTick > __smp_Now ? t->lastTick : __smp_Now); // new priority for the thread
//printTree(__smp_Threads->root, 0, 0);
//printTree(__smp_ThreadsWaiting->root, 0, 0);
// find the waiting thread with the least priority
tree_Node *first = tree_FirstNode(__smp_ThreadsWaiting);
//io_Printf(" first0.id=%d\n", NODE_POINTER(first) ? NODE_POINTER(first)->id : 0);
while (first && (NODE_POINTER(first)->sleepUntil > __smp_Now || NODE_POINTER(first)->waitCondition != NULL)) {
//io_Printf(" iterating, .id=%d\n", NODE_POINTER(first) ? NODE_POINTER(first)->id : 0);
while (first && (NODE_POINTER(first)->sleepUntil > __smp_Now || NODE_POINTER(first)->waitCondition != NULL))
first = tree_Node_Next(first);
}
if (first && (NODE_POINTER(first)->sleepUntil <= __smp_Now && NODE_POINTER(first)->waitCondition == NULL) && first->key > priority) {
if (first && (NODE_POINTER(first)->sleepUntil <= __smp_Now && NODE_POINTER(first)->waitCondition == NULL) && first->key > priority)
// the current thread is still the first, return
//io_Printf(" Not context switching, still running %d\n", t ? t->id : 0);
return 0;
}
// we need a real context switch
// first save the current thread context
@ -58,10 +51,8 @@ SYSV_ABI uintptr_t __smp_Switch() {
memcpy(&t->state, &__smp_IntSwitch_LastState, sizeof(smp_thread_State));
tree_Node *node = 0;
bool ok = false;
do {
node = tree_InsertNode(__smp_ThreadsWaiting, priority, &ok);
priority++;
} while (!ok);
while (!ok)
node = tree_InsertNode(__smp_ThreadsWaiting, priority++, &ok);
NODE_POINTER(node) = t;
}
@ -70,10 +61,8 @@ SYSV_ABI uintptr_t __smp_Switch() {
__smp_IntSwitch_LastState.rip = (uint64_t)__smp_Switch_Idle;
__smp_IntSwitch_LastState.rflags |= 1 << 9; // Interrupt Enable flag
__smp_Current[0] = 0;
//io_WriteConsoleASCII("__smp_Switch: Entering idle\n");
} else {
// load the new context
//io_Printf(" Context switching, from %d to %d\n", t ? t->id : 0, NODE_POINTER(first)->id);
memcpy(&__smp_IntSwitch_LastState, &NODE_POINTER(first)->state, sizeof(smp_thread_State));
__smp_Current[0] = NODE_POINTER(first);
tree_Delete(__smp_ThreadsWaiting, first);