See [README] 1 for information on Ruby itself.

This is built on [version 1.9.3-p429] 2.

[x] update init_heap()

• initialize shared memory page [x] update gc_newobj()
• check freelist: do we need to GC (low)?
• can we go concurrent? if so: call concurrent_garbage_collect()
• always return new object [x] add concurrent_garbage_collect()
• same as garbage_collect except only collects a freelist into shared memory

1. disallow to go concurrent
2. prepare shared memory
3. call fork(). if child: call child_garbage_collect(), else: return [x] add child_garbage_collect()

• actions as child process

1. call mark
2. update memory page
3. signal changes
4. exit [x] add signal handler for changes

• actions as parent process

1. merge changes
2. allow to go concurrent again