Updated benchmark scripts to check for C extensions.

Author: jdantonio

examples/bench_atomic.rb

@@ -1,8 +1,18 @@
+#!/usr/bin/env ruby
+
+$: << File.expand_path('../../lib', __FILE__)
+
 require 'benchmark'
 require 'rbconfig'
 require 'thread'
+
 require 'concurrent/atomic'
 
+unless defined? Concurrent::CAtomic
+  warn "[ERROR] C extensions not loaded!"
+  exit(1)
+end
+
 Thread.abort_on_exception = true
 
 $go = false # for synchronizing parallel threads

examples/bench_atomic_1.rb

@@ -6,10 +6,11 @@
 require 'thread'
 require 'benchmark'
 
-begin
-  require 'concurrent-ext'
-rescue LoadError
-  require 'concurrent'
+require 'concurrent/atomic'
+
+unless defined? Concurrent::CAtomic
+  warn "[ERROR] C extensions not loaded!"
+  exit(1)
 end
 
 Thread.abort_on_exception = true