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>.