Commits on Mar 25, 2018

1. Rewrite sem_* interface with GCD semaphore on macOS …

   sem_init(), sem_post(), sem_wait(), etc. are deprecated on macOS.
   
   To summarize the points of why macOS deprecated these:
     * Appendix 9 of the Single UNIX Specification states they are not
       mandatory interfaces
     * "Most portable code" uses SYSV semaphores
     * Backwards compatibility with POSIX named semaphores, which share
       the sem_t type is difficult
   
   GCD semaphore is the only native unnamed semaphore interface available
   on macOS.

   

   jserv committed Mar 25, 2018
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