| /* |
| * Copyright (c) 2016, The OpenThread Authors. |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. 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. |
| * 3. Neither the name of the copyright holder 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 HOLDER 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. |
| */ |
| |
| /** |
| * @file |
| * This file implements the tasklet scheduler. |
| */ |
| |
| #include "tasklet.hpp" |
| |
| #include "common/code_utils.hpp" |
| #include "common/locator_getters.hpp" |
| |
| namespace ot { |
| |
| void Tasklet::Post(void) |
| { |
| if (!IsPosted()) |
| { |
| Get<Scheduler>().PostTasklet(*this); |
| } |
| } |
| |
| void Tasklet::Scheduler::PostTasklet(Tasklet &aTasklet) |
| { |
| // Tasklets are saved in a circular singly linked list. |
| |
| if (mTail == nullptr) |
| { |
| mTail = &aTasklet; |
| mTail->mNext = mTail; |
| otTaskletsSignalPending(&aTasklet.GetInstance()); |
| } |
| else |
| { |
| aTasklet.mNext = mTail->mNext; |
| mTail->mNext = &aTasklet; |
| mTail = &aTasklet; |
| } |
| } |
| |
| void Tasklet::Scheduler::ProcessQueuedTasklets(void) |
| { |
| Tasklet *tail = mTail; |
| |
| // This method processes all tasklets queued when this is called. We |
| // keep a copy the current list and then clear the main list by |
| // setting `mTail` to `nullptr`. A newly posted tasklet while |
| // processing the currently queued tasklets will then trigger a call |
| // to `otTaskletsSignalPending()`. |
| |
| mTail = nullptr; |
| |
| while (tail != nullptr) |
| { |
| Tasklet *tasklet = tail->mNext; |
| |
| if (tasklet == tail) |
| { |
| tail = nullptr; |
| } |
| else |
| { |
| tail->mNext = tasklet->mNext; |
| } |
| |
| tasklet->mNext = nullptr; |
| tasklet->RunTask(); |
| } |
| } |
| |
| } // namespace ot |