diff --git a/lib/process_shared/condition_variable.rb b/lib/process_shared/condition_variable.rb
index 0fd42b4..bf4d17c 100644
--- a/lib/process_shared/condition_variable.rb
+++ b/lib/process_shared/condition_variable.rb
@@ -16,7 +16,9 @@ module ProcessShared
     end
 
     def signal
-      @sem.post
+      @internal.synchronize do
+        @sem.post unless @waiting.read_int.zero?
+      end
     end
 
     def wait(mutex, timeout = nil)
diff --git a/lib/process_shared/shared_memory_io.rb b/lib/process_shared/shared_memory_io.rb
index a21a8a0..dee31fb 100644
--- a/lib/process_shared/shared_memory_io.rb
+++ b/lib/process_shared/shared_memory_io.rb
@@ -198,6 +198,7 @@ module ProcessShared
     def read(length = nil, buffer = nil)
       length ||= (mem.size - pos)
       buffer ||= ''
+      buffer.force_encoding('ASCII-8BIT') unless RUBY_VERSION.start_with?('1.8')
       
       actual_length = [(mem.size - pos), length].min
       actual_length.times do
diff --git a/spec/process_shared/condition_variable_spec.rb b/spec/process_shared/condition_variable_spec.rb
index 7ffcaba..8631503 100644
--- a/spec/process_shared/condition_variable_spec.rb
+++ b/spec/process_shared/condition_variable_spec.rb
@@ -63,5 +63,19 @@ module ProcessShared
         (Time.now.to_f - start).must be_gte(0.1)
       }
     end
+
+    it 'correctly handles #signal when no waiters' do
+      mutex = Mutex.new
+      cond = ConditionVariable.new
+
+      # fix for bug: #wait not waiting after unmatched call to #signal
+      cond.signal
+
+      mutex.synchronize {
+        start = Time.now.to_f
+        cond.wait(mutex, 0.1)
+        (Time.now.to_f - start).must be_gte(0.1)
+      }
+    end
   end
 end
diff --git a/spec/process_shared/shared_memory_io_spec.rb b/spec/process_shared/shared_memory_io_spec.rb
new file mode 100644
index 0000000..2c31173
--- /dev/null
+++ b/spec/process_shared/shared_memory_io_spec.rb
@@ -0,0 +1,40 @@
+# encoding: UTF-8
+# ^^^
+# NOTE: This magic comment is necessary for the UTF-8 string literal below
+#       on Ruby 1.9.x
+require 'spec_helper'
+require 'process_shared'
+
+module ProcessShared
+  describe SharedMemoryIO do
+
+    describe '#read' do
+      def binary(s)
+        (RUBY_VERSION == '1.8.7') ? s : s.force_encoding('ASCII-8BIT')
+      end
+
+      def output_for(input)
+        mem = SharedMemory.new(16)
+        mem.put_bytes(0, input, 0, input.bytesize)
+        io = SharedMemoryIO.new(mem)
+        io.read(input.bytesize)
+      end
+
+      it 'returns correct binary data for plain ASCII string' do
+        input = 'Hello'
+        output_for(input).must_equal binary(input)
+      end
+
+      it 'returns correct binary data for UTF-8 string' do
+        input = 'Mária'
+        output_for(input).must_equal binary(input)
+      end
+
+      it 'returns correct binary data for explicitly binary data' do
+        input = "\x00\xD1\x9B\x86\x00"
+        output_for(input).must_equal binary(input)
+      end
+    end
+
+  end
+end