Function pages_commit_impl

deps/jemalloc/src/pages.c:248–279

}

static bool
pages_commit_impl(void *addr, size_t size, bool commit) {
	assert(PAGE_ADDR2BASE(addr) == addr);
	assert(PAGE_CEILING(size) == size);

	if (os_overcommits) {
		return true;
	}

#ifdef _WIN32
	return (commit ? (addr != VirtualAlloc(addr, size, MEM_COMMIT,
	    PAGE_READWRITE)) : (!VirtualFree(addr, size, MEM_DECOMMIT)));
#else
	{
		int prot = commit ? PAGES_PROT_COMMIT : PAGES_PROT_DECOMMIT;
		void *result = mmap(addr, size, prot, mmap_flags | MAP_FIXED,
		    -1, 0);
		if (result == MAP_FAILED) {
			return true;
		}
		if (result != addr) {
			/*
			 * We succeeded in mapping memory, but not in the right
			 * place.
			 */
			os_pages_unmap(result, size);
			return true;
		}
		return false;
	}
#endif
}

bool
pages_commit(void *addr, size_t size) {