Mojo Log service and a thread-safe client library.

mojo/public/cpp/environment/environment.h

Index: mojo/public/cpp/environment/environment.h
diff --git a/mojo/public/cpp/environment/environment.h b/mojo/public/cpp/environment/environment.h
index 85d17992c0a865f6f4f5e2b0a5a34ecef5c4e931..198e3b127f251ef63b3638ce4660a3b8de116adb 100644
--- a/mojo/public/cpp/environment/environment.h
+++ b/mojo/public/cpp/environment/environment.h
@@ -31,6 +31,7 @@ class Environment {
 
   static const MojoAsyncWaiter* GetDefaultAsyncWaiter();
 
+  // TODO(vardhan):  Require that this logger is thread-safe.

[viettrungluu, 2015/12/17 18:34:39]

It occurs to me that ... I'm not *that* stupid.

In the definition of MojoLogger (//mojo/public/c/environment/logger.h), the
thread-safety requirements are precisely defined.

(Basically, it says that things are thread-safe, except for
SetMinimumLogLevel(), which must not be called concurrently with other stuff.)

So you can remove this TODO.

[vardhan, 2015/12/17 23:35:42]

Done.

   static const MojoLogger* GetDefaultLogger();
   // Setting the logger to null will use the standard implementation.
   static void SetDefaultLogger(const MojoLogger* logger);