UNREGISTER_SOUND_MID(9) Sound Devices UNREGISTER_SOUND_MID(9)NAME
unregister_sound_midi - unregister a midi device
SYNOPSIS
void unregister_sound_midi(int unit);
ARGUMENTS
unit
unit number to allocate
DESCRIPTION
Release a sound device that was allocated with register_sound_midi. The unit passed is the return value from the register function.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 UNREGISTER_SOUND_MID(9)
Check Out this Related Man Page
UNR(9) BSD Kernel Developer's Manual UNR(9)NAME
new_unrhdr, delete_unrhdr, alloc_unr, alloc_unr_specific, free_unr -- kernel unit number allocator
SYNOPSIS
#include <sys/systm.h>
struct unrhdr *
new_unrhdr(int low, int high, struct mtx *mutex);
void
delete_unrhdr(struct unrhdr *uh);
int
alloc_unr(struct unrhdr *uh);
int
alloc_unrl(struct unrhdr *uh);
int
alloc_unr_specific(struct unrhdr *uh, u_int item);
void
free_unr(struct unrhdr *uh, u_int item);
DESCRIPTION
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.
delete_unrhdr(uh)
Destroy specified unit number allocator entity.
alloc_unr(uh)
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.
alloc_unrl(uh)
Same as alloc_unr() except that mutex is assumed to be already locked and thus is not used.
alloc_unr_specific(uh, item)
Allocate a specific unit number. This function allocates memory and thus may sleep. The allocated unit number is returned on suc-
cess. If the specified number is already allocated or out of the range, -1 is returned.
free_unr(uh, item)
Free a previously allocated unit number. This function may require allocating memory, and thus it can sleep. There is no pre-locked
variant.
CODE REFERENCES
The above functions are implemented in sys/kern/subr_unit.c.
HISTORY
Kernel unit number allocator first appeared in FreeBSD 6.0.
AUTHORS
Kernel unit number allocator was written by Poul-Henning Kamp. This manpage was written by Gleb Smirnoff.
BSD July 5, 2010 BSD
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