INTRO (9) NetBSD Kernel Developer's Manual INTRO (9) NAME ...

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PMF (9) NetBSD Kernel Developer’s Manual PMF (9)CODE REFERENCESThis section describes places within the NetBSD source tree where actual code implementing or using thepower management framework can be found. All pathnames are relative to /usr/src.The power management framework is implemented within the files sys/sys/pmf.h,sys/sys/device.h, sys/kern/kern_pmf.c, and sys/kern/subr_autoconf.c.SEE ALSOautoconf(9), driver(9)HISTORYThe PMF framework appeared in NetBSD 5.0.AUTHORSJared D. McNeill 〈jmcneill@NetBSD.org〉Joerg Sonnenberger 〈joerg@NetBSD.org〉NetBSD 3.0 March 29, 2008 4
POOL (9) NetBSD Kernel Developer’s Manual POOL (9)NAMEpool_init, pool_destroy, pool_get, pool_put, pool_prime, pool_sethiwat,pool_setlowat —resource-pool managerSYNOPSIS#include voidpool_init(struct pool ∗pp , size_t size , u_int align , u_int align_offset ,int flags , const char ∗wchan , struct pool_allocator ∗palloc , int ipl );voidpool_destroy(struct pool ∗pp);void ∗pool_get(struct pool ∗pp , int flags);voidpool_put(struct pool ∗pp , void ∗item);intpool_prime(struct pool ∗pp , int nitems);voidpool_sethiwat(struct pool ∗pp , int n);voidpool_setlowat(struct pool ∗pp , int n);DESCRIPTIONThese utility routines provide management of pools of fixed-sized areas of memory. Resource pools setaside an amount of memory for exclusive use by the resource pool owner. This can be used by applicationsto guarantee the availability of a minimum amount of memory needed to continue operation independent ofthe memory resources currently available from the system-wide memory allocator ( malloc(9) ) .INITIALIZING A POOLThe function pool_init() initializes a resource pool. The arguments are:ppsizealignThe handle identifying the pool resource instance.Specifies the size of the memory items managed by the pool.Specifies the memory address alignment of the items returned by pool_get().This argument must be a power of two. If zero, the alignment defaults to an architecture-specificnatural alignment.align_offset The offset within an item to which the align parameter applies.flagswchanpallocShould be set to zero or PR_NOTOUCH. If PR_NOTOUCH is given, free items arenever used to keep internal state so that the pool can be used for non memorybacked objects.The ‘wait channel’ passed on to cv_wait(9) if pool_get() must wait for itemsto be returned to the pool.Can be set to NULL or pool_allocator_kmem, inwhich case the default kernelmemory allocator will be used. It can also be set topool_allocator_nointr when the pool will never beaccessed from interruptcontext.NetBSD 3.0 July 25, 2007 1
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