Commits on Feb 21, 2018

1. Refactor signal handlers …

   Breaking change:
   - Harness the SIGCHLD handling, which is required by Process#wait.
     Now we always handle SIGCHLD using SignalChildHandler. Trying to
     reset or ignore SIGCHLD will actually set the default handler,
     trying to trap SIGCHLD will wrap the custom handler instead.
   
   Fixes:
   - Synchronize some accesses using a Mutex and an Atomic to further
     enhance potential concurrency issues —probably impossible until
     parallelism is implemented.
   - No longer closes the file descriptor at exit, which prevents an
     unhandled exception when receiving a signal while the program is
     exiting.
   - Restore STDIN/OUT/ERR blocking state on exit.
   
   Simplify implementation:
   - Move private types (SignalHandler, SignalChildHandler) to the
     private Crystal namespace.
   - Rename SignalHandler to Crystal::Signal.
   - No more singleton classes.
   - Using a Channel directly instead of a Concurrent::Future.
   - Using macros under enum (it wasn't possible before).
   - Introduce LibC::SIG_DFL and LibC::SIG_IGN definitions.

   

   ysbaddaden committed Feb 21, 2018
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