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¶
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.
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¶
vm_map(9)
AUTHORS¶
This manual page was written by
Bruce M
Simpson ⟨bms@spc.org⟩.