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