DESCRIPTION
The vm_map_lock macro obtains an exclusive lock on map. The vm_map_unlock macro releases an exclusive lock on map.
The vm_map_lock_read macro obtains a read-lock on map. Currently this is implemented as an exclusive lock.
The vm_map_unlock_read macro releases a read-lock on map.
The vm_map_trylock macro attempts to obtain an exclusive lock on map. It returns FALSE if the lock cannot be immediately acquired; otherwise return TRUE with the lock acquired.
The vm_map_trylock_read macro attempts to obtain a read-lock on map. It returns FALSE if the lock cannot be immediately acquired; otherwise return TRUE with the lock acquired. Currently this is implemented as an exclusive lock.
The vm_map_lock_upgrade macro attempts to atomically upgrade a read-lock on map to an exclusive lock. As read-locks are currently implemented as exclusive locks, this macro is a no-op.
The vm_map_lock_downgrade macro attempts to downgrade an exclusive lock on map to a read-lock. As read-locks are currently implemented as exclusive locks, this macro is a no-op.
IMPLEMENTATION NOTES
Currently, all of the locking macros implement their locks as sleep locks.
SEE ALSO
vm_map(9)
AUTHORS
