XXX EMSCRIPTEN

This function is only used in constructors. So there is not exception handling in this function. If the function exits via an exception, there will be

This function is only used in constructors. So there is not exception handling in this function. If the function exits via an exception, there will be

TODO: Test this with non-AT_FDCWD values.

XXX EMSCRIPTEN: pass in fmt_fp and pop_arg as a function pointer, so iprintf/__small_printf don't force linking in of floating-point code.

TODO PRINT template or availability markup fires too eagerly (http://llvm.org/PR61563).

Purge the arenas; if `force_purge` is true, amenable parts are purged even if not yet expired

Visit all set bits in a bitmap. todo: optimize further? maybe use avx512 to directly get all indices using a mask_compressstore?

Get the theap belonging to a heap without creating in if it is not yet initialized.

Generic allocation routine if the fast path (`alloc.c:mi_page_malloc`) does not succeed. Note: in debug mode the size includes MI_PADDING_SIZE and mig

allocate meta-data

if large OS pages are supported (2 or 4MiB), then return the size, otherwise return the small page size (4KiB)

In secure mode, try to decommit an area and output a warning if this fails.

free retired pages: we don't need to look at the entire queues since we only retire pages that are at the head position in a queue.

return the thread local heap ensuring it is initialized (and not `NULL` or `&_mi_theap_empty`);

called from `mi_theap_delete` to free the internal theap resources.