NAME

vmem_xalloc - Allocate resource from arena

SYNOPSIS



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. Otherwise, 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 allocated.

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)