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 | */ |
14 | void 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 | */ |
19 | bool hasPHDRCache(); |
20 | |