Move thread_pool.h into utils so it can be shared by more than one example.

native_client_sdk/src/libraries/utils/macros.h

-/* Copyright (c) 2012 The Chromium Authors. All rights reserved.
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-#ifndef LIBRARIES_UTILS_MACROS_H_
-#define LIBRARIES_UTILS_MACROS_H_
-
-/**
- * A macro to disallow the evil copy constructor and operator= functions
- * This should be used in the private: declarations for a class.
- */
-#define DISALLOW_COPY_AND_ASSIGN(TypeName)      \
-  TypeName(const TypeName&);                    \
-  void operator=(const TypeName&)
-
-/** returns the size of a member of a struct. */
-#define MEMBER_SIZE(struct_name, member) sizeof(((struct_name*)0)->member)
-
-/**
- * Macros to prevent name mangling of definitions, allowing them to be
- * referenced from C.
- */
-#ifdef __cplusplus
-# define EXTERN_C_BEGIN  extern "C" {
-# define EXTERN_C_END    }
-#else
-# define EXTERN_C_BEGIN
-# define EXTERN_C_END
-#endif  /* __cplusplus */
-
-/**
- * Macros to help force linkage of symbols that otherwise would not be
- * included.
- *
- * // In a source file that you want to force linkage (file scope):
- * FORCE_LINK_THIS(myfilename);
- *
- * // In a source file that you are sure will be linked (file scope):
- * FORCE_LINK_THAT(myfilename)
- *
- */
-#define FORCE_LINK_THIS(x) int force_link_##x = 0;
-#define FORCE_LINK_THAT(x) \
-  void force_link_function_##x() { \
-    extern int force_link_##x; \
-    force_link_##x = 1; \
-  }
-
-#endif  /* LIBRARIES_UTILS_MACROS_H_ */