TODO: record owner and lock count.

x should be positive, normal finite value

* Write binary id length and then its data, because binary id does not * have a fixed length. */

Whether this directory implementation always returns the same `File` object for a given file. Most backends can be much simpler if they don't handle t

Allocate from the OS (if allowed)

Allocate a regular small/medium/large page.

initialize a bitmap to all unset; avoid a mem_zero if `already_zero` is true returns the size of the bitmap

Is a sequence of n bits already all set/cleared?

Assign a specific size bin to a chunk

Check if a sequence of `n` bits within a chunk are all set/cleared.

Find a set bit in the bitmap and try to atomically clear it and claim it. (Used to find pages in the pages_abandoned bitmaps.)

Free a block Fast path written carefully to prevent register spilling on the stack

linear check if the free list contains a specific element

Index a block in a page

get ownership; returns true if the page was not owned before.

Currently committed part of a page

Thread free access

setting a tls slot is only used on macOS for now

unit > 0 : size in binary bytes unit == 0: count as decimal unit < 0 : count in binary

Reserve a range of regular OS memory

destroy all subproc resources including arena's, heap's etc.

internal generic allocation

Visit all pages in a theap; returns `false` if break was called.

engine characteristics

mmap() \p ProfileFile for profile merging purposes, assuming that an * exclusive lock is held on the file and that \p ProfileFileSize is the * lengt