[release/6.0-preview3] Make CLOCK_MONOTONIC handling more precise in pal_threading.c #50498
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The root cause of the problem in #50388 turned out to be because we do not have `pthread_condattr_setclock(..., CLOCK_MONOTONIC);` on iOS. This caused the timeout argument for `pthread_cond_timedwait` to be interpreted as an _absolute system time_ (in seconds since the Unix epoch), however the value we got back from `clock_gettime(CLOCK_MONOTONIC, ...)` was actually some value based on the uptime of the system. Since the uptime is much smaller than the system time the wait immediately returned. Harden the handling by adding a check for `HAVE_PTHREAD_CONDATTR_SETCLOCK` like we already do in `SystemNative_LowLevelMonitor_Create()`
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stephentoub
approved these changes
Mar 31, 2021
marek-safar
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Mar 31, 2021
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Backport of #50441 to release/6.0-preview3
/cc @steveisok @akoeplinger
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