examples: Add all-timers example

This commit adds a very simple example which is useful to verify
that all timers APIs are working. There are 3 protothreads running,
the first process tests etimer, timer and stimer APIs, the second
process tests the ctimer APIs, and the third one tests the rtimer
APIs.

examples/timers/Makefile

@@ -0,0 +1,5 @@
+CONTIKI_PROJECT = all-timers
+all: $(CONTIKI_PROJECT)
+
+CONTIKI = ../..
+include $(CONTIKI)/Makefile.include

examples/timers/all-timers.c

@@ -0,0 +1,131 @@
+/*
+ * Copyright (C) 2015, Intel Corporation. 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.
+ */
+
+#include <stdio.h>
+
+#include "contiki.h"
+#include "sys/etimer.h"
+#include "sys/stimer.h"
+#include "sys/timer.h"
+#include "sys/rtimer.h"
+
+PROCESS(process1, "ETimer x Timer x STimer Process");
+PROCESS(process2, "CTimer Process 2");
+PROCESS(process3, "RTimer Process 3");
+AUTOSTART_PROCESSES(&process1, &process2, &process3);
+
+static int counter_etimer;
+static int counter_timer;
+static int counter_stimer;
+static int counter_ctimer;
+static int counter_rtimer;
+static struct timer timer_timer;
+static struct stimer timer_stimer;
+static struct ctimer timer_ctimer;
+static struct rtimer timer_rtimer;
+static rtimer_clock_t timeout_rtimer = RTIMER_SECOND / 2;
+
+void
+do_timeout1()
+{
+  counter_etimer++;
+  if(timer_expired(&timer_timer)) {
+    counter_timer++;
+  }
+
+  if(stimer_expired(&timer_stimer)) {
+    counter_stimer++;
+  }
+
+  printf("\nProcess 1: %s", counter_timer == counter_etimer
+         && counter_timer == counter_stimer ? "SUCCESS" : "FAIL");
+}
+/*---------------------------------------------------------------------------*/
+void
+do_timeout2()
+{
+  ctimer_reset(&timer_ctimer);
+  printf("\nProcess 2: CTimer callback called");
+  counter_ctimer++;
+}
+/*---------------------------------------------------------------------------*/
+void
+do_timeout3(struct rtimer *timer, void *ptr)
+{
+  counter_rtimer++;
+
+  printf("\nProcess 3: RTimer callback called");
+
+  /* Re-arm rtimer */
+  rtimer_set(&timer_rtimer, RTIMER_NOW() + timeout_rtimer, 0, do_timeout3,
+             NULL);
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(process1, ev, data)
+{
+  static struct etimer timer_etimer;
+
+  PROCESS_BEGIN();
+
+  while(1) {
+    timer_set(&timer_timer, 3 * CLOCK_SECOND);
+    stimer_set(&timer_stimer, 3);
+    etimer_set(&timer_etimer, 3 * CLOCK_SECOND);
+    PROCESS_WAIT_EVENT_UNTIL(ev == PROCESS_EVENT_TIMER);
+    do_timeout1();
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(process2, ev, data)
+{
+  PROCESS_BEGIN();
+
+  while(1) {
+    ctimer_set(&timer_ctimer, 5 * CLOCK_SECOND, do_timeout2, NULL);
+    PROCESS_YIELD();
+  }
+
+  PROCESS_END();
+}
+/*---------------------------------------------------------------------------*/
+PROCESS_THREAD(process3, ev, data)
+{
+  PROCESS_BEGIN();
+
+  while(1) {
+    rtimer_set(&timer_rtimer, RTIMER_NOW() + timeout_rtimer, 0,
+               do_timeout3, NULL);
+    PROCESS_YIELD();
+  }
+
+  PROCESS_END();
+}