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-/*
-    ChibiOS/RT - Copyright (C) 2006,2007,2008,2009,2010 Giovanni Di Sirio.
-
-    This file is part of ChibiOS/RT.
-
-    ChibiOS/RT is free software; you can redistribute it and/or modify
-    it under the terms of the GNU General Public License as published by
-    the Free Software Foundation; either version 3 of the License, or
-    (at your option) any later version.
-
-    ChibiOS/RT is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-    GNU General Public License for more details.
-
-    You should have received a copy of the GNU General Public License
-    along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-/**
- * @page article_wakeup How to wake up a thread from an interrupt handler
- * Waking up a thread after an hardware event is one of the most common tasks
- * that an RTOS must be able to perform efficiently. In ChibiOS/RT there are
- * several mechanisms that can be used, often each mechanism is best suited
- * in a specific scenario.
- *
- * <h2>Synchronously waking up a specific thread</h2>
- * A common situation is to have to synchronously wake up a specific thread.
- * This can be accomplished without the use of any specific synchronization
- * primitive, it uses the very efficient low level scheduler APIs, note that
- * you can also optionally send a simple message from the IRQ handler to
- * the thread.
- * @code
-static Thread *tp = NULL;
-
-void mythread(void *p) {
-
-  while (TRUE) {
-    msg_t msg;
-
-    // Waiting for the IRQ to happen.
-    chSysLock();
-    tp = chThdSelf();
-    chSchGoSleepS(PRSUSPENDED);
-    msg = chThdSelf()->p_rdymsg;    // Retrieving the message, optional
-    chSysUnlock();
-    // Perform processing here.
-  }
-}
-
-CH_IRQ_HANDLER(myIRQ) {
-  CH_IRQ_PROLOGUE();
-
-  // Wakes up the thread.
-  chSysLockFromIsr();
-  if (tp != NULL) {
-    tp->p_rdymsg = (msg_t)55;       // Sending the message, optional
-    chSchReadyI(tp);
-    tp = NULL;
-  }
-  chSysUnlockFromIsr().
-
-  CH_IRQ_EPILOGUE();
-}
- * @endcode
- *
- * <h2>Synchronously waking up one of the waiting threads</h2>
- * Lets assume you have a queue of waiting threads, you want to wake up
- * the threads one by one in FIFO order, if there are no waiting threads
- * then nothing happens.<br>
- * This can be accomplished using a @p Semaphore object initialized to zero:
- * @code
-CH_IRQ_HANDLER(myIRQ) {
-  CH_IRQ_PROLOGUE();
-
-  // If there is at least one waiting thread then signal it.
-  chSysLockFromIsr();
-  if (chSemGetCounterI(&mysem) < 0)
-    chSemSignalI(&mysem);
-  chSysUnlockFromIsr().
-
-  CH_IRQ_EPILOGUE();
-}
- * @endcode
- *
- * <h2>Synchronously waking up all the waiting threads</h2>
- * In this scenario you want to synchronously wake up all the waiting threads,
- * if there are no waiting threads then nothing happens.<br>
- * This can be accomplished using a @p Semaphore object initialized to zero:
- * @code
-CH_IRQ_HANDLER(myIRQ) {
-  CH_IRQ_PROLOGUE();
-
-  // Wakes up all the threads waiting on the semaphore.
-  chSysLockFromIsr();
-  chSemResetI(&mysem);
-  chSysUnlockFromIsr().
-
-  CH_IRQ_EPILOGUE();
-}
- * @endcode
- *
- * <h2>Asynchronously waking up a specific thread</h2>
- * If you have to asynchronously wake up a specific thread then a simple
- * event flags can be used.
- * @code
-static Thread *tp;
-
-void mythread(void *p) {
-
-  tp = chThdSelf();
-  while (TRUE) {
-    // Checks if an IRQ happened else wait.
-    chEvtWaitAny((eventmask_t)1);
-    // Perform processing here.
-  }
-}
-
-CH_IRQ_HANDLER(myIRQ) {
-  CH_IRQ_PROLOGUE();
-
-  // Wakes up the thread.
-  chSysLockFromIsr();
-  chEvtSignalI(tp, (eventmask_t)1);
-  chSysUnlockFromIsr().
-
-  CH_IRQ_EPILOGUE();
-}
- * @endcode
- *
- * <h2>Asynchronously waking up one or more threads</h2>
- * By using event sources it is possible to asynchronously wake up one or more
- * listener threads. The mechanism requires a single initialized
- * @p EventSource object, all the threads registered as listeners on the
- * event source will be broadcasted.
- * @code
-CH_IRQ_HANDLER(myIRQ) {
-  CH_IRQ_PROLOGUE();
-
-  // Pends an event flag on all the listening threads.
-  chSysLockFromIsr();
-  chEvtBroadcastI(&my_event_source);
-  chSysUnlockFromIsr().
-
-  CH_IRQ_EPILOGUE();
-}
- * @endcode
- */