vmem_xalloc(9) - NetBSD Manual Pages

VMEM_XALLOC(9)         NetBSD Kernel Developer's Manual         VMEM_XALLOC(9)


NAME
vmem_xalloc -- Allocate resource from arena
SYNOPSIS
#include <sys/vmem.h> vmem_addr_t vmem_xalloc(vmem_t *vm, vmem_size_t size, vmem_size_t align, vmem_size_t phase, vmem_size_t nocross, vmem_addr_t minaddr, vmem_addr_t maxaddr, vm_flag_t flags);
DESCRIPTION
vmem_xalloc() allocates a resource from the arena. vm The arena which we allocate from. size Specify the size of the allocation. align If zero, don't care about the alignment of the allocation. Oth- erwise, request a resource segment starting at offset phase from an align aligned boundary. phase See the above description of align. If align is zero, phase should be zero. Otherwise, phase should be smaller than align. nocross Request a resource which doesn't cross nocross aligned boundary. minaddr If non-zero, specify the minimum address which can be allocated. maxaddr If non-zero, specify the maximum address + 1 which can be allo- cated. flags A bitwise OR of an allocation strategy and a sleep flag. The allocation strategy is one of: VM_BESTFIT Prefer space efficiency. VM_INSTANTFIT Prefer performance. The sleep flag should be one of: VM_SLEEP Can sleep until enough resources are available. VM_NOSLEEP Don't sleep. Immediately return VMEM_ADDR_NULL if there are not enough resources available.
RETURN VALUES
On success, vmem_xalloc() returns an allocated vmem_addr_t. Otherwise, it returns VMEM_ADDR_NULL.
SEE ALSO
intro(9), vmem(9) NetBSD 5.1.2 November 4, 2006 NetBSD 5.1.2

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