Rewrite sem_* interface with GCD semaphore on macOS #37
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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.
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sem_init(), sem_post(), sem_wait(), etc. are deprecated on macOS.
To summarize the points of why macOS deprecated these:
mandatory interfaces
the sem_t type is difficult
GCD semaphore is the only native unnamed semaphore interface available
on macOS.