VM_MAP_LOCK(9) | FreeBSD Kernel Developer's Manual | VM_MAP_LOCK(9) |
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 macrosSYNOPSIS
#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 <bms@spc.org>.July 19, 2003 | FreeBSD |