include pseudocodized versions of the 3 threads

totally-pseudocode.txt

@@ -0,0 +1,109 @@
+Shared Variables: freelist, list-1, list-2: block
+
+Thread-1:
+var b: pointer to type block;
+while (true)
+{
+
+//    wait for >1 block on freelist
+   wait(sem_freelist_minus_1);
+//    wait for element on freelist
+   wait(sem_freelist);
+//    mutual exclusion for freelist
+   wait(mut_freelist);
+
+   b := unlink(freelist);
+//    mutual exclusion for freelist
+   signal(mut_freelist);
+
+   produce_information_in_block(b);
+
+//    mutual exclusion for list1
+   wait(mut_list1);
+
+   link(b, list1);
+//    mutual exclusion for list1
+   signal(mut_list1);
+//    signal new element on list1
+   signal(sem_list1);
+
+}
+
+Thread-2:
+var x, y: pointer to type block;
+while (true)
+{
+
+//    wait for element on list1
+   wait(sem_list1);
+//    mutual exclusion for list1
+   wait(mut_list1);
+
+   x := unlink(list-1);
+
+//    mutual exclusion for list1
+   signal(mut_list1);
+
+//    wait for element on freelist
+   wait(sem_freelist);
+//    mutual exclusion for freelist
+   wait(mut_freelist);
+
+   y := unlink(freelist);
+
+//    mutual exclusion for freelist
+   signal(mut_freelist);
+
+   use_block_x_to_produce_info_in_y(x, y);
+
+//    mutual exclusion for freelist
+   wait(mut_freelist);
+//*    link(x, freelist);
+   link(x, freelist);
+//    mutual exclusion for freelist
+   signal(mut_freelist);
+//    signal new element on freelist
+   signal(sem_freelist);
+
+//    mutual exclusion for list2
+   wait(mut_list2);
+
+   link(y, list-2);
+
+//    mutual exclusion for list2
+   signal(mut_list2);
+//    signal new element on list2
+   signal(sem_list2);
+
+}
+
+Thread-3:
+var c: pointer to type block;
+while (true)
+{
+
+//    wait for element on list2
+   wait(sem_list2);
+//    mutual exclusion for list2
+   wait(mut_list2);
+
+   c := unlink(list-2);
+
+//    mutual exclusion for list2
+   signal(mut_list2);
+
+   consume_information_in_block(c);
+
+//    mutual exclusion for freelist
+   wait(mut_freelist);
+
+   link(c, freelist);
+
+//    mutual exclusion for freelist
+   signal(mut_freelist);
+//    signal Thread-1 to continue
+   signal(sem_freelist_minus_1);
+//    signal new element on freelist
+   signal(sem_freelist);
+
+}