Function monero

pub fn monero(current_size_bytes: usize) -> NonZeroUsize

Memory map resize closely matching monerod.

Method

This function mostly matches monerod’s current resize implementation¹, and will increase current_size_bytes by 1 << 30² exactly then rounded to the nearest multiple of the OS page size.

// The value this function will increment by
// (assuming page multiple of 4096).
const N: usize = 1_073_741_824;

// 0 returns the minimum value.
assert_eq!(monero(0).get(), N);

// Rounds up to nearest OS page size.
assert_eq!(monero(1).get(), N + PAGE_SIZE.get());

Panics

This function will panic if adding onto current_size_bytes overflows usize::MAX.

// Ridiculous large numbers panic.
monero(usize::MAX);

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1. https://github.com/monero-project/monero/blob/059028a30a8ae9752338a7897329fe8012a310d5/src/blockchain_db/lmdb/db_lmdb.cpp#L549 ↩

2. 1_073_745_920 ↩