ACQUIRE_CONSOLE_SEM(9) Driver Basics ACQUIRE_CONSOLE_SEM(9)NAME
acquire_console_sem - lock the console system for exclusive use.
SYNOPSIS
void acquire_console_sem(void);
ARGUMENTS
void
no arguments
DESCRIPTION
Acquires a semaphore which guarantees that the caller has exclusive access to the console system and the console_drivers list.
Can sleep, returns nothing.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 ACQUIRE_CONSOLE_SEM(9)
Check Out this Related Man Page
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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