* src/threads/native/threads.h (threads_sem_init): New function.

* src/threads/native/threads.h (threads_sem_init): New function.
(threads_sem_post): New function.

* src/threads/native/threads.c (threads_sem_init): New function.
(threads_sem_wait): Added assertion.
(threads_sem_post): New function.
(various function): Use threads_sem_init and threads_sem_post.

* src/native/jvmti/cacaodbg.c (getworkingdatalock): Use threads_sem_post.
(cacaodbgfork): Use threads_sem_init.

* src/native/jvmti/cacaodbgserver.c (contchild, waitloop).
Use threads_sem_post.