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mojo/public/c/include/mojo/system/wait.h

Index: mojo/public/c/include/mojo/system/wait.h
diff --git a/mojo/public/c/include/mojo/system/wait.h b/mojo/public/c/include/mojo/system/wait.h
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-// 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 handles (directly).
-//
-// Note: This header should be compilable as C.
-
-#ifndef MOJO_PUBLIC_C_INCLUDE_MOJO_SYSTEM_WAIT_H_
-#define MOJO_PUBLIC_C_INCLUDE_MOJO_SYSTEM_WAIT_H_
-
-#include <mojo/macros.h>
-#include <mojo/result.h>
-#include <mojo/system/handle.h>
-#include <mojo/system/time.h>
-
-MOJO_BEGIN_EXTERN_C
-
-// |MojoWait()|: Waits on the given handle until one of the following happens:
-//   - A signal indicated by |signals| is satisfied.
-//   - It becomes known that no signal indicated by |signals| will ever be
-//     satisfied. (See the description of the |MOJO_RESULT_CANCELLED| and
-//     |MOJO_RESULT_FAILED_PRECONDITION| return values below.)
-//   - Until |deadline| has passed.
-//
-// If |deadline| is |MOJO_DEADLINE_INDEFINITE|, this will wait "forever" (until
-// one of the other wait termination conditions is satisfied). If |deadline| is
-// 0, this will return |MOJO_RESULT_DEADLINE_EXCEEDED| only if one of the other
-// termination conditions (e.g., a signal is satisfied, or all signals are
-// unsatisfiable) is not already satisfied.
-//
-// |signals_state| (optional): See documentation for |MojoHandleSignalsState|.
-//
-// Returns:
-//   |MOJO_RESULT_OK| if some signal in |signals| was satisfied (or is already
-//       satisfied).
-//   |MOJO_RESULT_CANCELLED| if |handle| was closed (necessarily from another
-//       thread) during the wait.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if |handle| is not a valid handle (e.g., if
-//       it has already been closed). The |signals_state| value is unchanged.
-//   |MOJO_RESULT_DEADLINE_EXCEEDED| if the deadline has passed without any of
-//       the signals being satisfied.
-//   |MOJO_RESULT_FAILED_PRECONDITION| if it becomes known that none of the
-//       signals in |signals| can ever be satisfied (e.g., when waiting on one
-//       end of a message pipe and the other end is closed), at least not
-//       without performing some action on |handle| (see, e.g., |struct
-//       MojoDataPipeConsumerOptions|).
-//   |MOJO_RESULT_BUSY| if |handle| is currently in use in some transaction
-//       (that, e.g., may result in it being invalidated, such as being sent in
-//       a message).
-//
-// If there are multiple waiters (on different threads, obviously) waiting on
-// the same handle and signal, and that signal becomes satisfied, all waiters
-// will be awoken.
-MojoResult MojoWait(
-    MojoHandle handle,                              // In.
-    MojoHandleSignals signals,                      // In.
-    MojoDeadline deadline,                          // In.
-    struct MojoHandleSignalsState* signals_state);  // Optional out.
-
-// |MojoWaitMany()|: Waits on |handles[0]|, ..., |handles[num_handles-1]| until:
-//   - (At least) one handle satisfies a signal indicated in its respective
-//     |signals[0]|, ..., |signals[num_handles-1]|.
-//   - It becomes known that no signal in some |signals[i]| will ever be
-//     satisfied.
-//   - |deadline| has passed.
-//
-// This means that |MojoWaitMany()| behaves as if |MojoWait()| were called on
-// each handle/signals pair simultaneously, completing when the first
-// |MojoWait()| would complete.
-//
-// See |MojoWait()| for more details about |deadline|.
-//
-// Note that if |num_handles| is 0, this will wait until |deadline| has passed
-// (possibly forever if it is |MOJO_DEADLINE_INDEFINITE|), and handles|,
-// |signals|, |result_index|, and |signals_states| will all be ignored (so they
-// may be null or invalid pointers).
-//
-// |result_index| (optional) is used to return the index of the handle that
-//     caused the call to return. For example, the index |i| (from 0 to
-//     |num_handles-1|) if |handle[i]| satisfies a signal from |signals[i]|. You
-//     must manually initialize this to a suitable sentinel value (e.g. -1)
-//     before you make this call because this value is not updated if there is
-//     no specific handle that causes the function to return. Pass null if you
-//     don't need this value to be returned.
-//
-// |signals_states| (optional) points to an array of size |num_handles| of
-//     MojoHandleSignalsState. See |MojoHandleSignalsState| for more details
-//     about the meaning of each array entry. This array is not an atomic
-//     snapshot. The array will be updated if the function does not return
-//     |MOJO_RESULT_INVALID_ARGUMENT| or |MOJO_RESULT_RESOURCE_EXHAUSTED|.
-//
-// Returns:
-//   |MOJO_RESULT_CANCELLED| if some |handle[i]| was closed (necessarily from
-//       another thread) during the wait.
-//   |MOJO_RESULT_RESOURCE_EXHAUSTED| if there are too many handles. The
-//       |signals_state| array is unchanged.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if some |handle[i]| is not a valid handle
-//       (e.g., if it is zero or if it has already been closed). The
-//       |signals_state| array is unchanged.
-//   |MOJO_RESULT_DEADLINE_EXCEEDED| if the deadline has passed without any of
-//       handles satisfying any of its signals.
-//   |MOJO_RESULT_FAILED_PRECONDITION| if it is or becomes impossible that SOME
-//       |handle[i]| will ever satisfy any of the signals in |signals[i]|, at
-//       least not without some action on |handle[i]| (see, e.g., |struct
-//       MojoDataPipeConsumerOptions|).
-//   |MOJO_RESULT_BUSY| if some |handle[i]| is currently in use in some
-//       transaction (that, e.g., may result in it being invalidated, such as
-//       being sent in a message).
-MojoResult MojoWaitMany(const MojoHandle* MOJO_RESTRICT handles,         // In.
-                        const MojoHandleSignals* MOJO_RESTRICT signals,  // In.
-                        uint32_t num_handles,                            // In.
-                        MojoDeadline deadline,                           // In.
-                        uint32_t* MOJO_RESTRICT result_index,  // Optional out.
-                        struct MojoHandleSignalsState* MOJO_RESTRICT
-                            signals_states);  // Optional out.
-
-MOJO_END_EXTERN_C
-
-#endif  // MOJO_PUBLIC_C_INCLUDE_MOJO_SYSTEM_WAIT_H_