1 files changed, 48 insertions, 0 deletions
diff --git a/04_exercise/slotmap/slotmap.c b/04_exercise/slotmap/slotmap.c
new file mode 100644
index 0000000..57c4ef5
--- /dev/null
+++ b/04_exercise/slotmap/slotmap.c
@@ -0,0 +1,48 @@
+//
+// Created by stefan on 18.06.20.
+//
+
+#include "slotmap.h"
+#include <stdio.h>
+smHeader smInit(smEntry * slab, size_t size) {
+    for (int i = 0; i < size; ++i) {
+        slab[i].value = (intptr_t)NULL;
+    }
+    return (smHeader){.slab = slab, .size=size};
+}
+int smInsert(smHeader const * header, void * value) {
+    for (size_t i = 0; i< header->size; ++i ) {
+        intptr_t ptr = atomic_load(&header->slab[i].value);
+        if((void *)ptr == NULL) {
+            intptr_t expected = (intptr_t) NULL;
+            if(atomic_compare_exchange_strong(&header->slab[i].value, &expected, (intptr_t) value)){
+                return 0;
+            }
+        }
+    }
+    return -1;
+}
+void smDelete(smEntry * node) {
+    intptr_t oldval = atomic_exchange(&node->value, (intptr_t)(NULL));
+    if((void *) oldval == NULL) {
+        fprintf(stderr, "A Node has been double deleted");
+    }
+}
+void smDeleteValue(smHeader const * header, void * value){
+    for (size_t i = 0; i< header->size; ++i ) {
+        intptr_t ptr = atomic_load(&header->slab[i].value);
+        if((void *)ptr == value) {
+            smDelete(&header->slab[i]);
+        }
+    }
+}
+smEntry *smFindEntry(smHeader const * header, SearchFunction func){
+    for (size_t i = 0; i< header->size; ++i ) {
+        void * value = (void *) atomic_load(&header->slab[i].value);
+
+        if(value != NULL && func(value)) {
+            return &header->slab[i];
+        }
+    }
+    return NULL;
+}