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Reengineer subr_unit

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Add support for passing in a mutex.  If NULL is passed a global
	subr_unit mutex is used.

	Add alloc_unrl() which expects the mutex to be held.

	Allocating a unit will never sleep as it does not need to allocate
	memory.

	Cut possible range in half so we can use -1 to mean "out of number".

	Collapse first and last runs into the head by means of counters.
	This saves memory in the common case(s).
This commit is contained in:
Poul-Henning Kamp 2005-03-08 10:40:48 +00:00
parent 3238ec33e1
commit d9a54d5c23
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=143283
2 changed files with 522 additions and 297 deletions
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814
sys/kern/subr_unit.c
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5
sys/sys/systm.h
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@ -320,9 +320,10 @@ void DELAY(int usec);
* Unit number allocation API. (kern/subr_unit.c)
*/
struct unrhdr;
struct unrhdr *new_unrhdr(u_int low, u_int high, struct mtx *mutex);
struct unrhdr *new_unrhdr(int low, int high, struct mtx *mutex);
void delete_unrhdr(struct unrhdr *uh);
u_int alloc_unr(struct unrhdr *uh);
int alloc_unr(struct unrhdr *uh);
int alloc_unrl(struct unrhdr *uh);
void free_unr(struct unrhdr *uh, u_int item);
#endif /* !_SYS_SYSTM_H_ */