53 lines
1.0 KiB
C
53 lines
1.0 KiB
C
#include "process.h"
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#include "alloc.h"
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#include "interrupts.h"
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#include "memory.h"
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#include "thread.h"
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#include "string.h"
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struct pcb *create_process(uint8_t uid)
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{
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static uint32_t pid = 1;
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struct pcb *new_pcb = vmalloc(sizeof(struct pcb));
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if (!new_pcb)
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return NULL;
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new_pcb->uid = uid;
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new_pcb->pid = pid++;
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new_pcb->heap = alloc_pages(4096, &new_pcb->cr3);
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if (!new_pcb->heap) {
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vfree(new_pcb);
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return NULL;
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}
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memcpy(new_pcb->heap, current_pd, 4096);
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new_pcb->next = new_pcb;
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new_pcb->prev = new_pcb;
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if (current_pcb) {
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new_pcb->next = current_pcb->next;
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new_pcb->prev = current_pcb;
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current_pcb->next = new_pcb;
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if (current_pcb->prev == current_pcb)
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current_pcb->prev = new_pcb;
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} else {
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current_pcb = new_pcb;
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}
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new_pcb->signals.pending = SIG_IGN;
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new_pcb->thread_list = NULL;
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return new_pcb;
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}
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void remove_pcb(struct pcb *pcb)
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{
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struct pcb *left = pcb->prev;
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struct pcb *right = pcb->next;
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if (pcb->heap)
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free_pages(pcb->heap, 4096);
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left->next = right;
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right->prev = left;
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vfree(pcb);
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}
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