Initial checkin of gRPC to third_party/

third_party/grpc/src/objective-c/RxLibrary/GRXForwardingWriter.h

Index: third_party/grpc/src/objective-c/RxLibrary/GRXForwardingWriter.h
diff --git a/third_party/tcmalloc/vendor/src/base/linuxthreads.h b/third_party/grpc/src/objective-c/RxLibrary/GRXForwardingWriter.h
similarity index 63%
copy from third_party/tcmalloc/vendor/src/base/linuxthreads.h
copy to third_party/grpc/src/objective-c/RxLibrary/GRXForwardingWriter.h
index 5c318fed7ec4c47e7bf082e315992e102abcd620..8d45b8ed8d3ed54465bf239e5e8cd752d2c9c571 100644
--- a/third_party/tcmalloc/vendor/src/base/linuxthreads.h
+++ b/third_party/grpc/src/objective-c/RxLibrary/GRXForwardingWriter.h
@@ -1,4 +1,6 @@
-/* Copyright (c) 2005-2007, Google Inc.
+/*
+ *
+ * Copyright 2015, Google Inc.
  * All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
@@ -27,27 +29,23 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
- * ---
- * Author: Markus Gutschke
- */
-
-#ifndef _LINUXTHREADS_H
-#define _LINUXTHREADS_H
-
-/* Include thread_lister.h to get the interface that we implement for linux.
  */
 
-/* We currently only support x86-32 and x86-64 on Linux. Porting to other
- * related platforms should not be difficult.
- */
-#if (defined(__i386__) || defined(__x86_64__) || defined(__ARM_ARCH_3__) || \
-     defined(__mips__) || defined(__PPC__)) && defined(__linux)
+#import "GRXWriter.h"
 
-/* Define the THREADS symbol to make sure that there is exactly one core dumper
- * built into the library.
+/**
+ * A "proxy" class that simply forwards values, completion, and errors from its input writer to its
+ * writeable.
+ * It is useful as a superclass for pipes that act as a transformation of their
+ * input writer, and for classes that represent objects with input and
+ * output sequences of values, like an RPC.
+ *
+ * Thread-safety:
+ * All messages sent to this object need to be serialized. When it is started, the writer it wraps
+ * is started in the same thread. Manual state changes are propagated to the wrapped writer in the
+ * same thread too. Importantly, all messages the wrapped writer sends to its writeable need to be
+ * serialized with any message sent to this object.
  */
-#define THREADS "Linux /proc"
-
-#endif
-
-#endif  /* _LINUXTHREADS_H */
+@interface GRXForwardingWriter : GRXWriter
+- (instancetype)initWithWriter:(GRXWriter *)writer NS_DESIGNATED_INITIALIZER;
+@end