Add mojo/c/system/{time.h,wait.h}.

mojo/public/c/system/functions.h

 // Copyright 2014 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 basic functions common to different Mojo system APIs.
+// DEPRECATED -- do not use: include individual header files instead.
+//
+// TODO(vtl): Delete this header file.
 //
 // Note: This header should be compilable as C.
 
 #ifndef MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_
 #define MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_
 
 #include "mojo/public/c/system/handle.h"
-#include "mojo/public/c/system/result.h"
-#include "mojo/public/c/system/types.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// Note: Pointer parameters that are labelled "optional" may be null (at least
-// under some circumstances). Non-const pointer parameters are also labeled
-// "in", "out", or "in/out", to indicate how they are used. (Note that how/if
-// such a parameter is used may depend on other parameters or the requested
-// operation's success/failure. E.g., a separate |flags| parameter may control
-// whether a given "in/out" parameter is used for input, output, or both.)
-
-// Returns the time, in microseconds, since some undefined point in the past.
-// The values are only meaningful relative to other values that were obtained
-// from the same device without an intervening system restart. Such values are
-// guaranteed to be monotonically non-decreasing with the passage of real time.
-// Although the units are microseconds, the resolution of the clock may vary and
-// is typically in the range of ~1-15 ms.
-MojoTimeTicks MojoGetTimeTicksNow(void);
-
-// Closes the given |handle|.
-//
-// Returns:
-//   |MOJO_RESULT_OK| on success.
-//   |MOJO_RESULT_INVALID_ARGUMENT| if |handle| is not a valid handle.
-//
-// Concurrent operations on |handle| may succeed (or fail as usual) if they
-// happen before the close, be cancelled with result |MOJO_RESULT_CANCELLED| if
-// they properly overlap (this is likely the case with |MojoWait()|, etc.), or
-// fail with |MOJO_RESULT_INVALID_ARGUMENT| if they happen after.
-MojoResult MojoClose(MojoHandle handle);
-
-// 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).
-//
-// 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,
-    MojoHandleSignals signals,
-    MojoDeadline deadline,
-    struct MojoHandleSignalsState* signals_state);  // Optional out.
-
-// 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|.
-//
-// |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]|.
-MojoResult MojoWaitMany(
-    const MojoHandle* handles,
-    const MojoHandleSignals* signals,
-    uint32_t num_handles,
-    MojoDeadline deadline,
-    uint32_t* result_index,                          // Optional out
-    struct MojoHandleSignalsState* signals_states);  // Optional out
-
-#ifdef __cplusplus
-}  // extern "C"
-#endif
+#include "mojo/public/c/system/time.h"
+#include "mojo/public/c/system/wait.h"
 
 #endif  // MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_