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Thread names in logs and deadlock debug tools

Dagur Valberg Johannsson requested to merge dagurval/bitcoin-cash-node:threadnames into master

This is a backport of PR15849 (Thread names in logs and deadlock debug tools).

See original PR for benchmarks.

Also includes some smaller follow-up PR's:

  • PR15968 - Fix portability issue with pthreads
  • PR16984 - util: Make thread names shorter
  • PR17038 - Don't rename main thread at process level

Test plan

New tests: ninja check

Run with -logthreadnames, observe lines are prefixed with thread

2020-10-28T11:39:16Z [init] init message: Done loading
2020-10-28T11:39:16Z [opencon] opencon thread start
2020-10-28T11:39:16Z [dnsseed] 0 addresses found from DNS seeds
2020-10-28T11:39:16Z [msghand] msghand thread start
2020-10-28T11:39:16Z [dnsseed] dnsseed thread exit

Compile with lockorder debugging enabled: cmake -GNinja -DCMAKE_BUILD_TYPE=Debug ..

Edited by Dagur Valberg Johannsson

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