Process.pid does not work on Heroku, #22

lib/sidekiq/manager.rb

@@ -45,10 +45,8 @@ module Sidekiq
 
       redis.with_connection do |conn|
         workers = conn.smembers('workers')
-        logger.info "My tag: ':#{Process.pid}-'"
-        logger.info "Current workers: #{workers.inspect}"
         workers.each do |name|
-          conn.srem('workers', name) if name =~ /:#{Process.pid}-/
+          conn.srem('workers', name) if name =~ /:#{process_id}-/
         end
       end
     end

lib/sidekiq/processor.rb

@@ -47,7 +47,7 @@ module Sidekiq
     end
 
     def to_s
-      @str ||= "#{hostname}:#{Process.pid}-#{Thread.current.object_id}:default"
+      @str ||= "#{hostname}:#{process_id}-#{Thread.current.object_id}:default"
     end
 
     private

lib/sidekiq/util.rb

@@ -41,5 +41,21 @@ module Sidekiq
     def redis
       Sidekiq::Manager.redis
     end
+
+    def process_id
+      Sidekiq::Util.process_id
+    end
+
+    def self.process_id
+      @pid ||= begin
+        if Process.pid == 1
+          # Heroku does not expose pids.
+          require 'securerandom'
+          (SecureRandom.random_number * 4_000_000_000).floor.to_s(16)
+        else
+          Process.pid
+        end
+      end
+    end
   end
 end