samples/include/tc_nano_timeout_common.h

/*
 * Copyright (c) 2015 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.
 */

#ifndef _samples_include_tc_nano_timeout_common__h_
#define _samples_include_tc_nano_timeout_common__h_

/*
 * SHORT_TIMEOUTS should be the preferred configuration, but they cause a
 * problem with the Jenkins auto-builders for the ARM QEMU. Until this is
 * fixed, do not use them by default.
 */
#define SHORT_TIMEOUTS 0
#if SHORT_TIMEOUTS
	#define TIMEOUT_BASE 10
	#define TIMEOUT_INCREMENT 5
#else
	#define TIMEOUT_BASE 50
	#define TIMEOUT_INCREMENT 25
#endif
#define TIMEOUT(x) (TIMEOUT_BASE + ((x) * TIMEOUT_INCREMENT))
#define TIMEOUT_TWO_INTERVALS TIMEOUT(1)
#define TIMEOUT_TEN_INTERVALS TIMEOUT(9)

/*
 * Verify a timeout is in range, either a diff of 0 or 1 to account for tick
 * boundaries.
 */
static inline int is_timeout_in_range(int32_t orig_ticks, int32_t expected)
{
	int32_t diff = nano_tick_get() - orig_ticks;

#if SHORT_TIMEOUTS
	/*
	 * This should be the real test: however, there is an issue with the
	 * Jenkins auto-builders and QEMU for ARM, where (it seems) if the
	 * builder is overloaded, they do not give enough time to a QEMU instance
	 * so the Zephyr ticker can increment multiple times (so the interrupt
	 * handling happens) before the regular processing does occur, which gives
	 * the impression that more ticks have elapsed than expected.
	 */

	if (diff != expected && diff != expected + 1) {
		TC_ERROR(" *** timeout skew: expected %d/%d, got %d\n",
					expected, expected + 1, diff);
		return 0;
	}

	/* TC_PRINT("timeout in range (%d vs %d)\n", diff, expected); */
	return 1;
#else
	return diff >= expected;
#endif
}

#endif /* _samples_include_tc_nano_timeout_common__h_ */