Function arena_init_locked

app/redis-6.2.6/deps/jemalloc/src/jemalloc.c:311–337

Create a new arena and insert it into the arenas array at index ind. */

/* Create a new arena and insert it into the arenas array at index ind. */
static arena_t *
arena_init_locked(tsdn_t *tsdn, unsigned ind, extent_hooks_t *extent_hooks) {
	arena_t *arena;

	assert(ind <= narenas_total_get());
	if (ind >= MALLOCX_ARENA_LIMIT) {
		return NULL;
	}
	if (ind == narenas_total_get()) {
		narenas_total_inc();
	}

	/*
	 * Another thread may have already initialized arenas[ind] if it's an
	 * auto arena.
	 */
	arena = arena_get(tsdn, ind, false);
	if (arena != NULL) {
		assert(ind < narenas_auto);
		return arena;
	}

	/* Actually initialize the arena. */
	arena = arena_new(tsdn, ind, extent_hooks);

	return arena;
}

static void
arena_new_create_background_thread(tsdn_t *tsdn, unsigned ind) {