macos: add pthread_rwlock_timedrdlock() ..._timedwrlock() #29
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On macos, the command
cargo run --example locks
will currently fail to link and fail to run.See also #28
This is due to the absence of both:
The unix.rs file already contains a helper function for
pthread_mutex_timedlock
I made simple modifications to
pthread_mutex_timedlock
to create the needed functions for rwlock.This allows the command
cargo run --example locks
to compile and run.