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FreeBSD 11.0 - man page for vm_map_unlock_read (freebsd section 9)

VM_MAP_LOCK(9)						   BSD 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; other- wise 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; other- wise 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>.
BSD
July 19, 2003 BSD

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