[Util] Pass pthread_self() to pthread_setschedparam instead of 0#2246
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Nowhere in the man page of `pthread_setschedparam` it is mentioned that `0` is a valid value. The example uses `pthread_self()`, so should we. (noticed by Anthony Towns)
Although no compiler appears to complain about it, these are not valid for c++11. (http://en.cppreference.com/w/cpp/language/aggregate_initialization says they're c++20) The structure is defined as: struct sched_param { int sched_priority; }; So passing 0 for the first field has the same effect.
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Mar 13, 2021
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Coming straight from bitcoin#12923.
Fixes a bug introduced in #2212 for some POSIX linux systems (observed on CentOS 7 currently)
Original upstream text: