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-rw-r--r--apps/examples/ostest/cond.c294
1 files changed, 0 insertions, 294 deletions
diff --git a/apps/examples/ostest/cond.c b/apps/examples/ostest/cond.c
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index 96468c3e4..000000000
--- a/apps/examples/ostest/cond.c
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-/***********************************************************************
- * cond.c
- *
- * Copyright (C) 2007, 2008 Gregory Nutt. All rights reserved.
- * Author: Gregory Nutt <gnutt@nuttx.org>
- *
- * 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 <unistd.h>
-#include "ostest.h"
-
-#ifndef NULL
-# define NULL (void*)0
-#endif
-
-static volatile enum { RUNNING, MUTEX_WAIT, COND_WAIT} waiter_state;
-
-static pthread_mutex_t mutex;
-static pthread_cond_t cond;
-static volatile int data_available = 0;
-static int waiter_nloops = 0;
-static int waiter_waits = 0;
-static int waiter_nerrors = 0;
-static int signaler_nloops = 0;
-static int signaler_already = 0;
-static int signaler_state = 0;
-static int signaler_nerrors = 0;
-
-static void *thread_waiter(void *parameter)
-{
- int status;
-
- printf("waiter_thread: Started\n");
-
- for(;;)
- {
- /* Take the mutex */
-
- waiter_state = MUTEX_WAIT;
- status = pthread_mutex_lock(&mutex);
- waiter_state = RUNNING;
-
- if (status != 0)
- {
- printf("waiter_thread: ERROR pthread_mutex_lock failed, status=%d\n", status);
- waiter_nerrors++;
- }
-
- /* Check if data is available -- if data is not available then
- * wait for it
- */
-
- if (!data_available)
- {
- /* We are higher priority than the signaler thread so the
- * only time that the signaler thread will have a chance to run is when
- * we are waiting for the condition variable. In this case, pthread_cond_wait
- * will automatically release the mutex for the signaler (then re-acquire
- * the mutex before returning.
- */
-
- waiter_state = COND_WAIT;
- status = pthread_cond_wait(&cond, &mutex);
- waiter_state = RUNNING;
-
- if (status != 0)
- {
- printf("waiter_thread: ERROR pthread_cond_wait failed, status=%d\n", status);
- waiter_nerrors++;
- }
- waiter_waits++;
- }
-
- /* Now data should be available */
-
- if (!data_available)
- {
- printf("waiter_thread: ERROR data not available after wait\n");
- waiter_nerrors++;
- }
-
- /* Clear data available */
-
- data_available = 0;
-
- /* Release the mutex */
-
- status = pthread_mutex_unlock(&mutex);
- if (status != 0)
- {
- printf("waiter_thread: ERROR waiter: pthread_mutex_unlock failed, status=%d\n", status);
- waiter_nerrors++;
- }
-
- waiter_nloops++;
- }
- return NULL;
-}
-
-static void *thread_signaler(void *parameter)
-{
- int status;
- int i;
-
- printf("thread_signaler: Started\n");
- for (i = 0; i < 32; i++)
- {
- /* Take the mutex. The waiter is higher priority and should
- * run until it waits for the condition. So, at this point
- * signaler should be waiting for the condition.
- */
-
- status = pthread_mutex_lock(&mutex);
- if (status != 0)
- {
- printf("thread_signaler: ERROR pthread_mutex_lock failed, status=%d\n", status);
- signaler_nerrors++;
- }
-
- /* Verify the state */
-
- if (waiter_state != COND_WAIT)
- {
- printf("thread_signaler: ERROR waiter state = %d != COND_WAITING\n", waiter_state);
- signaler_state++;
- }
-
- if (data_available)
- {
- printf("thread_signaler: ERROR data already available, waiter_state=%d\n", waiter_state);
- signaler_already++;
- }
-
- /* Set data available and signal the waiter */
-
- data_available = 1;
- status = pthread_cond_signal(&cond);
- if (status != 0)
- {
- printf("thread_signaler: ERROR pthread_cond_signal failed, status=%d\n", status);
- signaler_nerrors++;
- }
-
- /* Release the mutex */
-
- status = pthread_mutex_unlock(&mutex);
- if (status != 0)
- {
- printf("thread_signaler: ERROR pthread_mutex_unlock failed, status=%d\n", status);
- signaler_nerrors++;
- }
-
- signaler_nloops++;
- }
-
- printf("thread_signaler: Terminating\n");
- pthread_exit(NULL);
- return NULL; /* Non-reachable -- needed for some compilers */
-}
-
-void cond_test(void)
-{
- pthread_t waiter;
- pthread_t signaler;
- pthread_attr_t attr;
-#ifdef SDCC
- pthread_addr_t result;
-#endif
- struct sched_param sparam;
- int prio_min;
- int prio_max;
- int prio_mid;
- int status;
-
- /* Initialize the mutex */
-
- printf("cond_test: Initializing mutex\n");
- status = pthread_mutex_init(&mutex, NULL);
- if (status != 0)
- {
- printf("cond_test: ERROR pthread_mutex_init failed, status=%d\n", status);
- }
-
- /* Initialize the condition variable */
-
- printf("cond_test: Initializing cond\n");
- status = pthread_cond_init(&cond, NULL);
- if (status != 0)
- {
- printf("cond_test: ERROR pthread_condinit failed, status=%d\n", status);
- }
-
- /* Start the waiter thread at higher priority */
-
- printf("cond_test: Starting waiter\n");
- status = pthread_attr_init(&attr);
- if (status != 0)
- {
- printf("cond_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;
- status = pthread_attr_setschedparam(&attr,&sparam);
- if (status != OK)
- {
- printf("cond_test: pthread_attr_setschedparam failed, status=%d\n", status);
- }
- else
- {
- printf("cond_test: Set thread 1 priority to %d\n", sparam.sched_priority);
- }
-
- status = pthread_create(&waiter, &attr, thread_waiter, NULL);
- if (status != 0)
- {
- printf("cond_test: pthread_create failed, status=%d\n", status);
- }
-
- printf("cond_test: Starting signaler\n");
- status = pthread_attr_init(&attr);
- if (status != 0)
- {
- printf("cond_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("cond_test: pthread_attr_setschedparam failed, status=%d\n", status);
- }
- else
- {
- printf("cond_test: Set thread 2 priority to %d\n", sparam.sched_priority);
- }
-
- status = pthread_create(&signaler, &attr, thread_signaler, NULL);
- if (status != 0)
- {
- printf("cond_test: pthread_create failed, status=%d\n", status);
- }
-
- /* Wait for the threads to stop */
-
-#ifdef SDCC
- pthread_join(signaler, &result);
-#else
- pthread_join(signaler, NULL);
-#endif
- printf("cond_test: signaler terminated, now cancel the waiter\n");
- pthread_detach(waiter);
- pthread_cancel(waiter);
-
- printf("cond_test: \tWaiter\tSignaler\n");
- printf("cond_test: Loops\t%d\t%d\n", waiter_nloops, signaler_nloops);
- printf("cond_test: Errors\t%d\t%d\n", waiter_nerrors, signaler_nerrors);
- printf("cond_test:\n");
- printf("cond_test: %d times, waiter did not have to wait for data\n", waiter_nloops - waiter_waits);
- printf("cond_test: %d times, data was already available when the signaler run\n", signaler_already);
- printf("cond_test: %d times, the waiter was in an unexpected state when the signaler ran\n", signaler_state);
-}
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