Finish mmap

TP/TP1/rendu/mmap.c

@@ -16,7 +16,7 @@ struct MMap* mmap_init(){
     mmap->support->data = malloc(4096);
     mmap->free_list = createLinkedList();
     // insert 100 pages in the free list
-    for (int i = 0; i < 100; i++) {
+    for (int i=0; i < 100; i++) {
         struct PageInfo *page = malloc(sizeof(struct PageInfo));
         page->data = mmap->memory + i*4096;
         page->key = i;
@@ -25,11 +25,11 @@ struct MMap* mmap_init(){
     mmap->alloc_list = createLinkedList();
     mmap->swap = fopen("/tmp/myswap", "wb+");
     int tmp = -1;
-    for (int i = 0; i < 100*sizeof(int); i+=sizeof(int)) {
+    for (int i=0; i < 100; i++) {
         fwrite(&tmp, sizeof(int), 1, mmap->swap);
     }
     char tmp2 = '\0';
-    for (int i = 0; i < 100*4096; i++) {
+    for (int i=0; i < 100*4096; i++) {
             fwrite(&tmp2, 1, 1, mmap->swap);
     }
     return mmap;
@@ -45,7 +45,7 @@ void mmap_clean(struct MMap *mmap) {
 struct PageInfo* page_alloc(struct MMap *mmap) {
     struct PageInfo *page = NULL;
     page = page_free(mmap);
-    if(page!=NULL) {
+    if (page) {
         insertFirst(mmap->alloc_list, page->key, page);
         mmap->count++;
     }
@@ -55,7 +55,7 @@ struct PageInfo* page_alloc(struct MMap *mmap) {
 struct PageInfo* page_free(struct MMap *mmap) {
     struct PageInfo *page = NULL;
     struct node *node = deleteFirst(mmap->free_list);
-    if (node != NULL) {
+    if (node) {
         page = node->data;
     }
     return page;
@@ -74,18 +74,18 @@ int move_to_swap(struct MMap *mmap, struct PageInfo *page) {
     fseek(mmap->swap, 0, SEEK_SET);
     CHECK_FERROR(mmap->swap);
 
-    for (int i = 0; i < 100*sizeof(int); i+=sizeof(int)) {
+    for (int i=0; i < 100; i++) {
         fread(&key, sizeof(int), 1, mmap->swap);
         CHECK_FERROR(mmap->swap);
 
         if (key == -1) {
-            fseek(mmap->swap, i, SEEK_SET);
+            fseek(mmap->swap, i*sizeof(int), SEEK_SET);
             CHECK_FERROR(mmap->swap);
 
             fwrite(&page->key, sizeof(int), 1, mmap->swap);
             CHECK_FERROR(mmap->swap);
 
-            fseek(mmap->swap, 100*sizeof(int) + (i/sizeof(int))*4096, SEEK_SET);
+            fseek(mmap->swap, 100*sizeof(int) + i*4096, SEEK_SET);
             CHECK_FERROR(mmap->swap);
 
             fwrite(page->data, 4096, 1, mmap->swap);
@@ -102,20 +102,20 @@ struct PageInfo* read_from_swap(struct MMap* mmap, struct PageInfo *page) {
     fseek(mmap->swap, 0, SEEK_SET);
     CHECK_FERROR(mmap->swap);
 
-    for (int i = 0; i < 100*sizeof(int); i+=sizeof(int)) {
+    for (int i=0; i < 100; i++) {
         int ret = fread(&key, sizeof(int), 1, mmap->swap);
         CHECK_FERROR(mmap->swap);
 
         if (key != page->key)
             continue;
 
-        fseek(mmap->swap, 100*sizeof(int) + (i/sizeof(int))*4096, SEEK_SET);
+        fseek(mmap->swap, 100*sizeof(int) + i*4096, SEEK_SET);
         CHECK_FERROR(mmap->swap);
 
         fread(page->data, 4096, 1, mmap->swap);
         CHECK_FERROR(mmap->swap);
 
-        fseek(mmap->swap, i, SEEK_SET);
+        fseek(mmap->swap, i*sizeof(int), SEEK_SET);
         CHECK_FERROR(mmap->swap);
 
         int tmp = -1;
@@ -127,3 +127,54 @@ struct PageInfo* read_from_swap(struct MMap* mmap, struct PageInfo *page) {
     return NULL;
 }
 
+struct PageInfo* page_lookup(struct MMap* mmap, int key) {
+    struct node* data = find(mmap->alloc_list, key);
+    if (data) {
+        return data->data;
+    }
+
+    mmap->support->key = key;
+    struct PageInfo* page = read_from_swap(mmap, mmap->support);
+    if (page) { // Move one elem from mem to swap
+        struct PageInfo* swapped_page = deleteFirst(mmap->alloc_list)->data;
+        move_to_swap(mmap, swapped_page);
+
+        memcpy(swapped_page->data, mmap->support->data, 4096);
+        swapped_page->key = key;
+        insertFirst(mmap->alloc_list, key, swapped_page);
+        return page;
+    }
+    return NULL;
+}
+
+void page_remove(struct MMap *mmap, int key) {
+    struct PageInfo* page = page_lookup(mmap, key);
+    if (!page)
+        return;
+
+    deleteElement(mmap->alloc_list, key);
+    mmap->count--;
+}
+
+struct PageInfo *page_create(struct MMap *mmap, bool *moved_to_swap) {
+    if (mmap->count >= 200)
+        return NULL;
+
+    struct PageInfo* page = page_alloc(mmap);
+    *moved_to_swap = false;
+
+    if (page)
+        return page;
+
+    // Another page has been moved to swap
+    *moved_to_swap = true;
+    
+    page = deleteFirst(mmap->alloc_list)->data;
+    move_to_swap(mmap, page);
+    // Reuse swapped page for the new one
+    page->key = mmap->count;
+    mmap->count++;
+    insertFirst(mmap->alloc_list, page->key, page);
+
+    return page;
+}

TP/TP1/rendu/mmap.h

@@ -1,4 +1,5 @@
 #include <stdio.h>
+#include <stdbool.h>
 
 #include "linked_list.h"
 
@@ -27,4 +28,4 @@ int move_to_swap(struct MMap *mmap, struct PageInfo *page);
 struct PageInfo* read_from_swap(struct MMap* mmap, struct PageInfo *page);
 struct PageInfo *page_lookup(struct MMap *mmap, int key);
 void page_remove(struct MMap *mmap, int key);
-struct PageInfo *page_create(struct MMap *mmap, int *moved_to_swap);
+struct PageInfo *page_create(struct MMap *mmap, bool *moved_to_swap);