Function batch_alloc

BeefRT/JEMalloc/src/jemalloc.c:4131–4294

}

size_t
batch_alloc(void **ptrs, size_t num, size_t size, int flags) {
	LOG("core.batch_alloc.entry",
	    "ptrs: %p, num: %zu, size: %zu, flags: %d", ptrs, num, size, flags);

	tsd_t *tsd = tsd_fetch();
	check_entry_exit_locking(tsd_tsdn(tsd));

	size_t filled = 0;

	if (unlikely(tsd == NULL || tsd_reentrancy_level_get(tsd) > 0)) {
		goto label_done;
	}

	size_t alignment = MALLOCX_ALIGN_GET(flags);
	size_t usize;
	if (aligned_usize_get(size, alignment, &usize, NULL, false)) {
		goto label_done;
	}
	szind_t ind = sz_size2index(usize);
	bool zero = zero_get(MALLOCX_ZERO_GET(flags), /* slow */ true);

	/*
	 * The cache bin and arena will be lazily initialized; it's hard to
	 * know in advance whether each of them needs to be initialized.
	 */
	cache_bin_t *bin = NULL;
	arena_t *arena = NULL;

	size_t nregs = 0;
	if (likely(ind < SC_NBINS)) {
		nregs = bin_infos[ind].nregs;
		assert(nregs > 0);
	}

	while (filled < num) {
		size_t batch = num - filled;
		size_t surplus = SIZE_MAX; /* Dead store. */
		bool prof_sample_event = config_prof && opt_prof
		    && prof_active_get_unlocked()
		    && te_prof_sample_event_lookahead_surplus(tsd,
		    batch * usize, &surplus);

		if (prof_sample_event) {
			/*
			 * Adjust so that the batch does not trigger prof
			 * sampling.
			 */
			batch -= surplus / usize + 1;
			batch_alloc_prof_sample_assert(tsd, batch, usize);
		}

		size_t progress = 0;

		if (likely(ind < SC_NBINS) && batch >= nregs) {
			if (arena == NULL) {
				unsigned arena_ind = mallocx_arena_get(flags);
				if (arena_get_from_ind(tsd, arena_ind,