Index: mojo/public/c/system/functions.h |
diff --git a/mojo/public/c/system/functions.h b/mojo/public/c/system/functions.h |
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-// 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. |
-// |
-// Note: This header should be compilable as C. |
- |
-#ifndef MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_ |
-#define MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_ |
- |
-// Note: This header should be compilable as C. |
- |
-#include "mojo/public/c/system/system_export.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.) |
- |
-// Platform-dependent monotonically increasing tick count representing "right |
-// now." The resolution of this clock is ~1-15ms. Resolution varies depending |
-// on hardware/operating system configuration. |
-MOJO_SYSTEM_EXPORT 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. |
-MOJO_SYSTEM_EXPORT 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 is satisfied, all waiters |
-// will be awoken. |
-MOJO_SYSTEM_EXPORT 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]|. |
-MOJO_SYSTEM_EXPORT 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 |
- |
-#endif // MOJO_PUBLIC_C_SYSTEM_FUNCTIONS_H_ |