vm_map_lock_upgrade (9)
Leading comments
Copyright (c) 2003 Bruce M Simpson <bms@spc.org> All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met: 1. Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer. 2. Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documenta...
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
In sys/param.h In vm/vm.h In vm/vm_map.h Ft void Fn vm_map_lock vm_map_t map Ft void Fn vm_map_unlock vm_map_t map Ft void Fn vm_map_lock_read vm_map_t map Ft void Fn vm_map_unlock_read vm_map_t map Ft int Fn vm_map_trylock vm_map_t map Ft int Fn vm_map_trylock_read vm_map_t map Ft int Fn vm_map_lock_upgrade vm_map_t map Ft int Fn vm_map_lock_downgrade vm_map_t mapDESCRIPTION
The Fn vm_map_lock macro obtains an exclusive lock on Fa map .The Fn vm_map_unlock macro releases an exclusive lock on Fa map .
The Fn vm_map_lock_read macro obtains a read-lock on Fa map .
The Fn vm_map_unlock_read macro releases a read-lock on Fa map .
The Fn vm_map_trylock macro attempts to obtain an exclusive lock on Fa map . It returns FALSE if the lock cannot be immediately acquired; otherwise return TRUE with the lock acquired.
The Fn vm_map_trylock_read macro attempts to obtain a read-lock on Fa map . It returns FALSE if the lock cannot be immediately acquired; otherwise return TRUE with the lock acquired.
The Fn vm_map_lock_upgrade macro attempts to atomically upgrade a read-lock on Fa map to an exclusive lock.
The Fn vm_map_lock_downgrade macro attempts to downgrade an exclusive lock on Fa map to a read-lock.