| /* |
| * 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 <openthread/config.h> |
| |
| #include "tasklet.hpp" |
| |
| #include <openthread/openthread.h> |
| |
| #include "openthread-instance.h" |
| #include "common/code_utils.hpp" |
| #include "common/debug.hpp" |
| #include "net/ip6.hpp" |
| |
| namespace ot { |
| |
| Tasklet::Tasklet(TaskletScheduler &aScheduler, Handler aHandler, void *aContext): |
| TaskletSchedulerLocator(aScheduler), |
| Context(aContext), |
| mHandler(aHandler), |
| mNext(NULL) |
| { |
| } |
| |
| otError Tasklet::Post(void) |
| { |
| return GetTaskletScheduler().Post(*this); |
| } |
| |
| TaskletScheduler::TaskletScheduler(void): |
| mHead(NULL), |
| mTail(NULL) |
| { |
| } |
| |
| otError TaskletScheduler::Post(Tasklet &aTasklet) |
| { |
| otError error = OT_ERROR_NONE; |
| |
| VerifyOrExit(mTail != &aTasklet && aTasklet.mNext == NULL, error = OT_ERROR_ALREADY); |
| |
| if (mTail == NULL) |
| { |
| mHead = &aTasklet; |
| mTail = &aTasklet; |
| otTaskletsSignalPending(aTasklet.GetInstance()); |
| } |
| else |
| { |
| mTail->mNext = &aTasklet; |
| mTail = &aTasklet; |
| } |
| |
| exit: |
| return error; |
| } |
| |
| Tasklet *TaskletScheduler::PopTasklet(void) |
| { |
| Tasklet *task = mHead; |
| |
| if (task != NULL) |
| { |
| mHead = mHead->mNext; |
| |
| if (mHead == NULL) |
| { |
| mTail = NULL; |
| } |
| |
| task->mNext = NULL; |
| } |
| |
| return task; |
| } |
| |
| void TaskletScheduler::ProcessQueuedTasklets(void) |
| { |
| Tasklet *tail = mTail; |
| Tasklet *cur; |
| |
| while ((cur = PopTasklet()) != NULL) |
| { |
| cur->RunTask(); |
| |
| // only process tasklets that were queued at the time this method was called |
| if (cur == tail) |
| { |
| if (mHead != NULL) |
| { |
| otTaskletsSignalPending(mHead->GetInstance()); |
| } |
| |
| break; |
| } |
| } |
| } |
| |
| } // namespace ot |