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/* critical.c - test the task_offload_to_fiber() API */
/*
* Copyright (c) 2013-2014 Wind River Systems, Inc.
*
* 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 Wind River Systems 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.
*/
/*
DESCRIPTION
This module tests the task_offload_to_fiber() API.
*/
/* includes */
#include <vxmicro.h>
#include <tc_util.h>
#include <sections.h>
/* defines */
#define NUM_TICKS 500
#define TEST_TIMEOUT 2000
/* locals */
static uint32_t criticalVar = 0;
static uint32_t altTaskIterations = 0;
/*******************************************************************************
*
* criticalRtn - routine to be called from K_swapper()
*
* This routine increments the global variable <criticalVar>.
*
* RETURNS: 0
*/
int criticalRtn(void)
{
volatile uint32_t x;
x = criticalVar;
criticalVar = x + 1;
return 0;
}
/*******************************************************************************
*
* criticalLoop - common code for invoking task_offload_to_fiber()
*
* \param count number of critical section calls made thus far
*
* RETURNS: number of critical section calls made by task
*/
uint32_t criticalLoop(uint32_t count)
{
int32_t ticks;
ticks = task_tick_get_32();
while (task_tick_get_32() < ticks + NUM_TICKS) {
task_offload_to_fiber(criticalRtn, &criticalVar);
count++;
}
return count;
}
/*******************************************************************************
*
* AlternateTask - alternate task
*
* This routine calls task_offload_to_fiber() many times.
*
* RETURNS: N/A
*/
void AlternateTask(void)
{
task_sem_take_wait(ALT_SEM); /* Wait to be activated */
altTaskIterations = criticalLoop(altTaskIterations);
task_sem_give(REGRESS_SEM);
task_sem_take_wait(ALT_SEM); /* Wait to be re-activated */
altTaskIterations = criticalLoop(altTaskIterations);
task_sem_give(REGRESS_SEM);
}
/*******************************************************************************
*
* RegressionTask - regression task
*
* This routine calls task_offload_to_fiber() many times. It also checks to
* ensure that the number of times it is called matches the global variable
* <criticalVar>.
*
* RETURNS: N/A
*/
void RegressionTask(void)
{
uint32_t nCalls = 0;
int status;
TC_START("Test Microkernel Critical Section API\n");
task_sem_give(ALT_SEM); /* Activate AlternateTask() */
nCalls = criticalLoop(nCalls);
/* Wait for AlternateTask() to complete */
status = task_sem_take_wait_timeout(REGRESS_SEM, TEST_TIMEOUT);
if (status != RC_OK) {
TC_ERROR("Timed out waiting for REGRESS_SEM\n");
goto errorReturn;
}
if (criticalVar != nCalls + altTaskIterations) {
TC_ERROR("Unexpected value for <criticalVar>. Expected %d, got %d\n",
nCalls + altTaskIterations, criticalVar);
goto errorReturn;
}
TC_PRINT("Obtained expected <criticalVar> value of %u\n", criticalVar);
TC_PRINT("Enabling time slicing ...\n");
scheduler_time_slice_set(1, 10);
task_sem_give(ALT_SEM); /* Re-activate AlternateTask() */
nCalls = criticalLoop(nCalls);
/* Wait for AlternateTask() to finish */
status = task_sem_take_wait_timeout(REGRESS_SEM, TEST_TIMEOUT);
if (status != RC_OK) {
TC_ERROR("Timed out waiting for REGRESS_SEM\n");
goto errorReturn;
}
if (criticalVar != nCalls + altTaskIterations) {
TC_ERROR("Unexpected value for <criticalVar>. Expected %d, got %d\n",
nCalls + altTaskIterations, criticalVar);
goto errorReturn;
}
TC_PRINT("Obtained expected <criticalVar> value of %u\n", criticalVar);
TC_END_RESULT(TC_PASS);
TC_END_REPORT(TC_PASS);
return;
errorReturn:
TC_END_RESULT(TC_FAIL);
TC_END_REPORT(TC_FAIL);
}
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