1#pragma once
2
3/// This code was based on the code by Fedor Korotkiy (prime@yandex-team.ru) for YT product in Yandex.
4
5/** Collects all dl_phdr_info items and caches them in a static array.
6 * Also rewrites dl_iterate_phdr with a lock-free version which consults the above cache
7 * thus eliminating scalability bottleneck in C++ exception unwinding.
8 * As a drawback, this only works if no dynamic object unloading happens after this point.
9 * This function is thread-safe. You should call it to update cache after loading new shared libraries.
10 * Otherwise exception handling from dlopened libraries won't work (will call std::terminate immediately).
11 *
12 * NOTE: It is disabled with Thread Sanitizer because TSan can only use original "dl_iterate_phdr" function.
13 */
14void updatePHDRCache();
15
16/** Check if "dl_iterate_phdr" will be lock-free
17 * to determine if some features like Query Profiler can be used.
18 */
19bool hasPHDRCache();
20