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Add Atomthreads RTOS source files.
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Kelvin Lawson
278
tests/sem7.c
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278
tests/sem7.c
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/*
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* Copyright (c) 2010, Kelvin Lawson. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. No personal names or organizations' names associated with the
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* Atomthreads project may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE ATOMTHREADS PROJECT AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "atom.h"
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#include "atomtests.h"
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#include "atomsem.h"
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/* Test OS objects */
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static ATOM_SEM sem1;
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static ATOM_TCB tcb1;
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static uint8_t test1_thread_stack[TEST_THREAD_STACK_SIZE];
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/* Global shared data protected by mutex */
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static volatile int shared_data;
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/* Forward declarations */
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static void test_thread_func (uint32_t data);
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/**
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* \b test_start
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*
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* Start semaphore test.
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*
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* This tests usage of a semaphore for basic mutual exclusion type
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* operation. Note that Atomthreads has a more fully-featured real
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* mutex implementation in the mutex module.
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*
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* The semaphore sem1 is initialised with a count of 1. Whichever
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* thread holds this semaphore can then modify the global variable
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* "shared_data".
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*
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* The main thread first takes the "mutex" sem1, then creates a
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* second thread. The second thread should block on the sem1 mutex
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* until the main thread releases it. The test checks that the
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* global "shared_data" is not modified by the second thread
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* until the main thread releases the mutex.
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*
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* @retval Number of failures
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*/
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uint32_t test_start (void)
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{
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int failures;
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int i;
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/* Default to zero failures */
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failures = 0;
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/* Create sem with count one for mutex purposes */
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if (atomSemCreate (&sem1, 1) != ATOM_OK)
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{
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ATOMLOG (_STR("Error creating test semaphore 1\n"));
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failures++;
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}
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else
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{
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/* Initialise the shared_data to zero */
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shared_data = 0;
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/* Take the mutex to ensure only this thread can modify shared_data */
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if (atomSemGet (&sem1, 0) != ATOM_OK)
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{
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ATOMLOG (_STR("Error taking mutex\n"));
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failures++;
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}
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/* Create second thread */
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else if (atomThreadCreate(&tcb1, TEST_THREAD_PRIO, test_thread_func, 1,
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&test1_thread_stack[TEST_THREAD_STACK_SIZE - 1]) != ATOM_OK)
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{
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/* Fail */
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ATOMLOG (_STR("Error creating test thread\n"));
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failures++;
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}
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/*
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* The second thread has now been created and should block on
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* the "mutex" sem1 (which now has count zero) until we release
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* it. We wait a while and check that shared_data has not been
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* modified.
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*/
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for (i = 0; i < 4; i++)
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{
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/*
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* Sleep for a while to give the second thread a chance to
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* modify shared_data, thought it shouldn't until we
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* release the mutex.
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*/
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atomTimerDelay (SYSTEM_TICKS_PER_SEC/4);
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/* Check shared data. The second thread always sets it to one. */
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if (shared_data != 0)
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{
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ATOMLOG (_STR("Shared data modified\n"));
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failures++;
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break;
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}
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}
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/* Check successful so far */
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if (failures == 0)
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{
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/*
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* Release the mutex, which will allow the second thread to
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* wake and start modifying shared_data.
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*/
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if (atomSemPut (&sem1) != ATOM_OK)
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{
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ATOMLOG (_STR("Failed release\n"));
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failures++;
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}
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/*
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* Wait a little while then check that shared_data has
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* been modified.
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*/
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atomTimerDelay (SYSTEM_TICKS_PER_SEC/4);
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if (shared_data != 1)
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{
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ATOMLOG (_STR("Expected modify\n"));
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failures++;
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}
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/*
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* Release and take the mutex again a few times to ensure
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* that the mutex continues to protect shared_data.
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*/
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for (i = 0; i < 4; i++)
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{
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/*
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* Take the mutex again, to prevent second thread accessing
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* shared_data.
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*/
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if (atomSemGet (&sem1, SYSTEM_TICKS_PER_SEC) != ATOM_OK)
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{
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ATOMLOG (_STR("Retake %d\n"), i);
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failures++;
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break;
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}
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else
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{
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/*
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* Set shared_data to 0 and wait to ensure that the
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* second thread doesn't modify it while we have the
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* mutex again.
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*/
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shared_data = 0;
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/* Wait a while to give second thread potential to run */
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atomTimerDelay(SYSTEM_TICKS_PER_SEC/4);
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/*
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* Check that shared_data has not been modified while we
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* own the mutex.
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*/
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if (shared_data != 0)
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{
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/* Thread is still modifying the data */
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ATOMLOG (_STR("Still modifying\n"));
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failures++;
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break;
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}
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/*
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* Release the mutex, which will allow the second thread to
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* wake and start modifying shared_data again.
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*/
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if (atomSemPut (&sem1) != ATOM_OK)
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{
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ATOMLOG (_STR("Failed release\n"));
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failures++;
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}
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}
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}
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}
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/* Delete semaphore, test finished */
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if (atomSemDelete (&sem1) != ATOM_OK)
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{
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ATOMLOG (_STR("Delete failed\n"));
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failures++;
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}
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}
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/* Log final status */
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if (failures == 0)
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{
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ATOMLOG (_STR("Pass\n"));
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}
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else
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{
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ATOMLOG (_STR("Fail(%d)\n"), failures);
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}
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/* Quit */
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return failures;
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}
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/**
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* \b test_thread_func
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*
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* Entry point for test thread.
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*
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* @param[in] data Unused (optional thread entry parameter)
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*
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* @return None
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*/
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static void test_thread_func (uint32_t data)
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{
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uint8_t status;
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/* Repeatedly attempt to get the mutex and set shared_data to 1 */
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while (1)
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{
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/* Block on the mutex sem1 */
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if ((status = atomSemGet (&sem1, 0)) != ATOM_OK)
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{
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/* Error getting semaphore, notify the status code */
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ATOMLOG (_STR("G%d\n"), status);
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break;
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}
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/* Got the mutex */
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else
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{
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/* Set shared_data to signify that we think we have the mutex */
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shared_data = 1;
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/* Release the mutex allowing the main thread to take it again */
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if ((status = atomSemPut (&sem1)) != ATOM_OK)
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{
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/* Error putting semaphore, notify the status code */
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ATOMLOG (_STR("P%d\n"), status);
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break;
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}
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}
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}
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/* Loop forever - we only reach here on error */
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while (1)
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{
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atomTimerDelay (SYSTEM_TICKS_PER_SEC);
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}
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}
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