Fix for data races when threads are dynamically created#49

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jklinkenberg wants to merge 9 commits intobsc-performance-tools:masterfrom

jklinkenberg:master

Commits on Nov 29, 2020

first try to make Extrae threadsafe, especially for irregular pthread creation
jklinkenberg
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Commits on Dec 1, 2020

hopefully fixed data races. at least for my workloads it works now without a crash or seg fault also with high number of threads
jklinkenberg
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Commits on Jan 6, 2021

some code cleaning an reduction of different locks
jklinkenberg
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