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
SYNOPSIS
#include
<sys/param.h>
#include <vm/vm.h>
#include <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
Thevm_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.
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.
The
vm_map_lock_upgrade()
macro attempts to atomically upgrade a read-lock on
map to an exclusive lock.
The
vm_map_lock_downgrade()
macro attempts to downgrade an exclusive lock on map
to a read-lock.
IMPLEMENTATION NOTES
Currently, all of the locking macros implement their locks as sleep locks.
SEE ALSO
AUTHORS
This manual page was written by Bruce M Simpson <bms@spc.org>.