1 files changed, 246 insertions, 0 deletions
diff --git a/apps/examples/ostest/sem.c b/apps/examples/ostest/sem.c
new file mode 100644
index 000000000..850cf8040
--- /dev/null
+++ b/apps/examples/ostest/sem.c
@@ -0,0 +1,246 @@
+/***********************************************************************
+ * sem.c
+ *
+ *   Copyright (C) 2007-2009 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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 NuttX 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 OWNER 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 <pthread.h>
+#include <semaphore.h>
+#include <sched.h>
+#include "ostest.h"
+
+#ifndef NULL
+# define NULL (void*)0
+#endif
+
+static sem_t sem;
+
+static void *waiter_func(void *parameter)
+{
+  int id = (int)parameter;
+  int status;
+  int value;
+
+  printf("waiter_func: Thread %d Started\n",  id);
+
+  /* Take the semaphore */
+
+  status = sem_getvalue(&sem, &value);
+  if (status < 0)
+    {
+      printf("waiter_func: ERROR thread %d could not get semaphore value\n",  id);
+    }
+  else
+    {
+      printf("waiter_func: Thread %d initial semaphore value = %d\n",  id, value);
+    }
+
+  printf("waiter_func: Thread %d waiting on semaphore\n",  id);
+  status = sem_wait(&sem);
+  if (status != 0)
+    {
+      printf("waiter_func: ERROR thread %d sem_wait failed\n",  id);
+    }
+  printf("waiter_func: Thread %d awakened\n",  id);
+
+  status = sem_getvalue(&sem, &value);
+  if (status < 0)
+    {
+      printf("waiter_func: ERROR thread %d could not get semaphore value\n",  id);
+    }
+  else
+    {
+      printf("waiter_func: Thread %d new semaphore value = %d\n",  id, value);
+    }
+
+  printf("waiter_func: Thread %d done\n",  id);
+  return NULL;
+}
+
+static void *poster_func(void *parameter)
+{
+  int id = (int)parameter;
+  int status;
+  int value;
+
+  printf("poster_func: Thread %d started\n",  id);
+
+  /* Take the semaphore */
+
+  do
+    {
+      status = sem_getvalue(&sem, &value);
+      if (status < 0)
+        {
+          printf("poster_func: ERROR thread %d could not get semaphore value\n",  id);
+        }
+      else
+        {
+          printf("poster_func: Thread %d semaphore value = %d\n",  id, value);
+        }
+
+      if (value < 0)
+        {
+          printf("poster_func: Thread %d posting semaphore\n",  id);
+          status = sem_post(&sem);
+          if (status != 0)
+            {
+              printf("poster_func: ERROR thread %d sem_wait failed\n",  id);
+            }
+
+          pthread_yield();
+
+          status = sem_getvalue(&sem, &value);
+          if (status < 0)
+            {
+              printf("poster_func: ERROR thread %d could not get semaphore value\n",  id);
+            }
+          else
+            {
+              printf("poster_func: Thread %d new semaphore value = %d\n",  id, value);
+            }
+        }
+    }
+  while (value < 0);
+
+  printf("poster_func: Thread %d done\n",  id);
+  return NULL;
+
+}
+
+void sem_test(void)
+{
+  pthread_t waiter_thread1;
+  pthread_t waiter_thread2;
+  pthread_t poster_thread;
+#ifdef SDCC
+  pthread_addr_t result;
+#endif
+  struct sched_param sparam;
+  int prio_min;
+  int prio_max;
+  int prio_mid;
+  pthread_attr_t attr;
+  int status;
+
+  printf("sem_test: Initializing semaphore to 0\n");
+  sem_init(&sem, 0, 0);
+
+  /* Start two waiter thread instances */
+
+  printf("sem_test: Starting waiter thread 1\n");
+  status = pthread_attr_init(&attr);
+  if (status != OK)
+    {
+      printf("sem_test: pthread_attr_init failed, status=%d\n",  status);
+    }
+
+  prio_min = sched_get_priority_min(SCHED_FIFO);
+  prio_max = sched_get_priority_max(SCHED_FIFO);
+  prio_mid = (prio_min + prio_max) / 2;
+
+  sparam.sched_priority = (prio_mid + prio_max) / 2;
+  status = pthread_attr_setschedparam(&attr,&sparam);
+  if (status != OK)
+    {
+      printf("sem_test: pthread_attr_setschedparam failed, status=%d\n",  status);
+    }
+  else
+    {
+      printf("sem_test: Set thread 1 priority to %d\n",  sparam.sched_priority);
+    }
+
+  status = pthread_create(&waiter_thread1, &attr, waiter_func, (pthread_addr_t)1);
+  if (status != 0)
+    {
+      printf("sem_test: Error in thread 1 creation, status=%d\n",  status);
+    }
+
+  printf("sem_test: Starting waiter thread 2\n");
+  status = pthread_attr_init(&attr);
+  if (status != 0)
+    {
+      printf("sem_test: pthread_attr_init failed, status=%d\n",  status);
+    }
+
+  sparam.sched_priority = prio_mid;
+  status = pthread_attr_setschedparam(&attr,&sparam);
+  if (status != OK)
+    {
+      printf("sem_test: pthread_attr_setschedparam failed, status=%d\n",  status);
+    }
+  else
+    {
+      printf("sem_test: Set thread 2 priority to %d\n",  sparam.sched_priority);
+    }
+
+  status = pthread_create(&waiter_thread2, &attr, waiter_func, (pthread_addr_t)2);
+  if (status != 0)
+    {
+      printf("sem_test: Error in thread 2 creation, status=%d\n",  status);
+    }
+
+  printf("sem_test: Starting poster thread 3\n");
+  status = pthread_attr_init(&attr);
+  if (status != 0)
+    {
+      printf("sem_test: pthread_attr_init failed, status=%d\n",  status);
+    }
+
+  sparam.sched_priority = (prio_min + prio_mid) / 2;
+  status = pthread_attr_setschedparam(&attr,&sparam);
+  if (status != OK)
+    {
+      printf("sem_test: pthread_attr_setschedparam failed, status=%d\n",  status);
+    }
+  else
+    {
+      printf("sem_test: Set thread 3 priority to %d\n",  sparam.sched_priority);
+    }
+
+  status = pthread_create(&poster_thread, &attr, poster_func, (pthread_addr_t)3);
+  if (status != 0)
+    {
+      printf("sem_test: Error in thread 3 creation, status=%d\n",  status);
+    }
+
+#ifdef SDCC
+  pthread_join(waiter_thread1, &result);
+  pthread_join(waiter_thread2, &result);
+  pthread_join(poster_thread, &result);
+#else
+  pthread_join(waiter_thread1, NULL);
+  pthread_join(waiter_thread2, NULL);
+  pthread_join(poster_thread, NULL);
+#endif
+}