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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 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>.

FreeBSD	10.1			 July 19, 2003			  FreeBSD 10.1

NAME | SYNOPSIS | DESCRIPTION | IMPLEMENTATION NOTES | SEE ALSO | AUTHORS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=vm_map_lock&sektion=9&manpath=FreeBSD+9.2-RELEASE>

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