alive?()
Returns true if thr is running or sleeping.
thr = Thread.new { } thr.join #=> #<Thread:0x401b3fb0 dead> Thread.current.alive? #=> true thr.alive? #=> false
static VALUE rb_thread_alive_p(VALUE thread) { rb_thread_t *th; GetThreadPtr(thread, th); if (rb_threadptr_dead(th)) return Qfalse; return Qtrue; }