UNREGISTER_SOUND_MIX(9) Sound Devices UNREGISTER_SOUND_MIX(9)NAME
unregister_sound_mixer - unregister a mixer
void unregister_sound_mixer(int unit);
unit number to allocate
Release a sound device that was allocated with register_sound_mixer. The unit passed is the return value from the register function.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 UNREGISTER_SOUND_MIX(9)
Check Out this Related Man Page
ALLOC_UNR(9) BSD Kernel Developer's Manual ALLOC_UNR(9)NAME
new_unrhdr, delete_unrhdr, alloc_unr, free_unr -- kernel unit number allocator
struct unrhdr *
new_unrhdr(int low, int high, struct mtx *mutex);
delete_unrhdr(struct unrhdr *uh);
alloc_unr(struct unrhdr *uh);
alloc_unrl(struct unrhdr *uh);
free_unr(struct unrhdr *uh, u_int item);
The kernel unit number allocator is a generic facility, which allows to allocate unit numbers within a specified range.
new_unrhdr(low, high, mutex)
Initialize a new unit number allocator entity. The low and high arguments specify minimum and maximum number of unit numbers. There
is no cost associated with the range of unit numbers, so unless the resource really is finite, INT_MAX can be used. If mutex is not
NULL, it is used for locking when allocating and freeing units. Otherwise, internal mutex is used.
Destroy specified unit number allocator entity.
Return a new unit number. The lowest free number is always allocated. This function does not allocate memory and never sleeps, how-
ever it may block on a mutex. If no free unit numbers are left, -1 is returned.
Same as alloc_unr() except that mutex is assumed to be already locked and thus is not used.
Free a previously allocated unit number. This function may require allocating memory, and thus it can sleep. There is no pre-locked
The above functions are implemented in sys/kern/subr_unit.c.
Kernel unit number allocator first appeared in FreeBSD 6.0.
Kernel unit number allocator was written by Poul-Henning Kamp. This manpage was written by Gleb Smirnoff.
BSD February 7, 2010 BSD
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