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SPINNING LOCKS
spinlock_lock, spinlock_trylock, spinlock_unlock
+------------+
| spinlock_t |
+------------+
WAIT QUEUES
waitq_sleep_timeout, waitq_wakeup
+---------+
| waitq_t |
+---------+
/ \
SEMAPHORES / \ CONDITION VARIABLES
semaphore_down_timeout, semaphore_up condvar_wait_timeout, condvar_signal
+--------------+ / \ +-----------+
| semaphore_t |<-+ +->| condvar_t |
+--------------+ +-----------+
| ^
| |
| +------+
V /
MUTEXES / READERS/WRITERS LOCKS
mutex_lock_timeout, mutex_unlock rwlock_reader/writer_lock_timeout, rwlock_unlock
+---------+ / +----------+
| mutex_t |------------------------------->| rwlock_t |
+---------+ / +----------+
| /
+------------------------+