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VM_MAP_LOCK (9) | Kernel routines | Unix Manual Pages | :man

NAME

vm_map_lock, vm_map_unlock, vm_map_lock_read, vm_map_unlock_read, vm_map_trylock, vm_map_trylock_read, vm_map_lock_upgrade, vm_map_lock_downgrade - vm_map locking macros

CONTENTS

Synopsis
Description
Implementation Notes
See Also
Authors

SYNOPSIS


.In sys/param.h
.In vm/vm.h
.In vm/vm_map.h void vm_map_lock "vm_map_t map" void vm_map_unlock "vm_map_t map" void vm_map_lock_read "vm_map_t map" void vm_map_unlock_read "vm_map_t map" int vm_map_trylock "vm_map_t map" int vm_map_trylock_read "vm_map_t map" int vm_map_lock_upgrade "vm_map_t map" int vm_map_lock_downgrade "vm_map_t map"

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


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