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vm_map_lock_read (9)

>> vm_map_lock_read (9) ( FreeBSD man: Ядро )

BSD mandoc

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 Fa map .

The vm_map_unlock ();
macro releases an exclusive lock on Fa map .

The vm_map_lock_read ();
macro obtains a read-lock on Fa map . Currently this is implemented as an exclusive lock.

The vm_map_unlock_read ();
macro releases a read-lock on Fa map .

The 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 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. Currently this is implemented as an exclusive lock.

The vm_map_lock_upgrade ();
macro attempts to atomically upgrade a read-lock on Fa map to an exclusive lock. As read-locks are currently implemented as exclusive locks, this macro is a no-op.

The vm_map_lock_downgrade ();
macro attempts to downgrade an exclusive lock on Fa map to a read-lock. As read-locks are currently implemented as exclusive locks, this macro is a no-op.