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diff --git a/include/grpc/support/thd.h b/include/grpc/support/thd.h
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+/*
+ *
+ * Copyright 2014, Google Inc.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ */
+
+#ifndef __GRPC_SUPPORT_THD_H__
+#define __GRPC_SUPPORT_THD_H__
+/* Thread interface for GPR.
+
+   Types
+        gpr_thd_id        a thread identifier.
+                          (Currently no calls take a thread identifier.
+                          It exists for future extensibility.)
+        gpr_thd_options   options used when creating a thread
+ */
+
+#include <grpc/support/port_platform.h>
+
+#if defined(GPR_POSIX_SYNC)
+#include <grpc/support/thd_posix.h>
+#elif defined(GPR_WIN32)
+#include <grpc/support/thd_win32.h>
+#else
+#error could not determine platform for thd
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Thread creation options. */
+typedef struct {
+  int flags; /* Flags below can be set here.  Default value 0.  */
+} gpr_thd_options;
+/* No flags are currently defined. */
+
+/* Create a new thread running (*thd_body)(arg) and place its thread identifier
+   in *t, and return true.  If there are insufficient resources, return false.
+   If options==NULL, default options are used.
+   The thread is immediately runnable, and exits when (*thd_body)() returns.  */
+int gpr_thd_new(gpr_thd_id *t, void (*thd_body)(void *arg), void *arg,
+                const gpr_thd_options *options);
+
+/* Return a gpr_thd_options struct with all fields set to defaults. */
+gpr_thd_options gpr_thd_options_default(void);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* __GRPC_SUPPORT_THD_H__ */