diff --git a/src/producer.c b/src/producer.c
index a28fba8..ee24dba 100644
--- a/src/producer.c
+++ b/src/producer.c
@@ -31,15 +31,12 @@ int main(int argc, char* argv[])
 int GetNextFreeSlot(SharedStruct* sharedMem)
 {
     int slot = -1;
-    while(1)
+    for (int i = 0; i < 10; i++)
     {
-        for (int i = 0; i < 10; i++)
+        if (sharedMem->buffer[i] == -1)
         {
-            if (sharedMem->buffer[i] == -1)
-            {
-                slot = i;
-                return slot;
-            }
+            slot = i;
+            return slot;
         }
     }
     return slot;
@@ -76,5 +73,13 @@ int produce_item(void)
 // Insert a number into the shared memory.
 void insert_item(int item, SharedStruct* sharedMem)
 {
-    sharedMem->buffer[GetNextFreeSlot(sharedMem)] = item;
+    int slot = GetNextFreeSlot(sharedMem);
+    while(slot < 0)
+    {
+        sem_post(&sharedMem->mutex);
+        sem_wait(&sharedMem->mutex);
+        slot = GetNextFreeSlot(sharedMem);
+    }
+    sharedMem->buffer[slot] = item;
+    return;
 }
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