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vm_map_unlock_read.9freebsd

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

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 map

DESCRIPTION

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.

IMPLEMENTATION NOTES

Currently, all of the locking macros implement their locks as sleep locks.

SEE ALSO

vm_map9

AUTHORS

This manual page was written by An Bruce M Simpson Aq bms@spc.org .