CMSIS Example - Signal

 /*----------------------------------------------------------------------------
  *      RL-ARM - RTX
  *----------------------------------------------------------------------------
  *      Name:    RTX_EX1.C
  *      Purpose: Your First RTX example program
  *----------------------------------------------------------------------------
  *
  * Copyright (c) 1999-2009 KEIL, 2009-2012 ARM Germany GmbH
  * All rights reserved.
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are met:
  *  - Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  - 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.
  *  - Neither the name of ARM  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 COPYRIGHT HOLDERS AND 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.
  *---------------------------------------------------------------------------*/

 #include "cmsis_os.h"

 /* Forward reference */
 void threadX (void const *argument);

 /* Thread IDs */
 osThreadId main_id;
 osThreadId threadX_id;

 /* Thread definitions */
 osThreadDef(threadX, osPriorityNormal, , );

 /*----------------------------------------------------------------------------
  *   Thread X
  *---------------------------------------------------------------------------*/
 void threadX (void const *argument) {
   for (;;) {
     /* Wait for completion of do-this */
     osSignalWait(0x0004, osWaitForever); /* do-that */
     /* Pause for 20 ms until signaling event to main thread */
     osDelay();
     /* Indicate to main thread completion of do-that */
     osSignalSet(main_id, 0x0004);
   }
 }

 /*----------------------------------------------------------------------------
  *   Main Thread
  *---------------------------------------------------------------------------*/
 int main (void) {

   /* Get main thread ID */
   main_id = osThreadGetId();
   /* Create thread X */
   threadX_id = osThreadCreate(osThread(threadX), NULL);
   for (;;) {    /* do-this */
     /* Indicate to thread X completion of do-this */
     osSignalSet(threadX_id, 0x0004);
     /* Wait for completion of do-that */
     osSignalWait(0x0004, osWaitForever);
     /* Wait now for 50 ms */
     osDelay();
   }
 }

 /*----------------------------------------------------------------------------
  * end of file
  *---------------------------------------------------------------------------*/