Add Core methods for wait set.

mojo/public/c/system/wait_set.h

 // Copyright 2016 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.
 
 // This file contains functions for waiting on multiple handles using wait sets.
 //
 // Note: This header should be compilable as C.
 
 #ifndef MOJO_PUBLIC_C_SYSTEM_WAIT_SET_H_
 #define MOJO_PUBLIC_C_SYSTEM_WAIT_SET_H_
@@ skipping 90 matching lines @@
 //   |MOJO_RESULT_INVALID_ARGUMENT| if |wait_set_handle| or |handle| do not
 //       refer to valid handles, |wait_set_handle| is not a handle to a wait
 //       set, or |options| is not null and |*options| is not a valid options
 //       structure.
 //   |MOJO_RESULT_ALREADY_EXISTS| if there is already an entry in the wait set
 //       with the same |cookie| value.
 //   |MOJO_RESULT_BUSY| if |wait_set_handle| or |handle| are currently in use in
 //       some transaction.
 //   |MOJO_RESULT_RESOURCE_EXHAUSTED| if the handle could not be added due to
 //       hitting a system or quota limitation.
-MojoResult MojoWaitSetAdd(const struct MojoWaitSetAddOptions* MOJO_RESTRICT
-                              options,                 // Optional in.
-                          MojoHandle wait_set_handle,  // In.
+MojoResult MojoWaitSetAdd(MojoHandle wait_set_handle,  // In.
                           MojoHandle handle,           // In.
                           MojoHandleSignals signals,   // In.
-                          uint64_t cookie);            // In.
+                          uint64_t cookie,             // In.
+                          const struct MojoWaitSetAddOptions* MOJO_RESTRICT
+                              options);  // Optional in.
 
 // |MojoWaitSetRemove()|: Removes an entry from the wait set specified by
 // |wait_set_handle| (which must have the |MOJO_HANDLE_RIGHT_WRITE| right).
 //
 // Returns:
 //   |MOJO_RESULT_OK| if the entry was successfully removed.
 //   |MOJO_RESULT_INVALID_ARGUMENT| if |wait_set_handle| does not refer to a
 //       valid wait set.
 //   |MOJO_RESULT_NOT_FOUND| if |cookie| does not identify an entry within the
 //       wait set.
@@ skipping 52 matching lines @@
 MojoResult MojoWaitSetWait(
     MojoHandle wait_set_handle,                       // In.
     MojoDeadline deadline,                            // In.
     uint32_t* MOJO_RESTRICT num_results,              // In/out.
     struct MojoWaitSetResult* MOJO_RESTRICT results,  // Out.
     uint32_t* MOJO_RESTRICT max_results);             // Optional out.
 
 MOJO_END_EXTERN_C
 
 #endif  // MOJO_PUBLIC_C_SYSTEM_WAIT_SET_H_