/* Unit tests for rdtsc. * * Author: Steffen Vogel * SPDX-FileCopyrightText: 2014-2023 Institute for Automation of Complex Power Systems, RWTH Aachen University * SPDX-License-Identifier: Apache-2.0 */ #include #include #include #include #define CNT (1 << 18) // cppcheck-suppress unknownMacro TestSuite(tsc, .description = "Timestamp counters"); Test(tsc, increasing) { int ret; struct Tsc tsc; uint64_t *cntrs; ret = tsc_init(&tsc); cr_assert_eq(ret, 0); cntrs = new uint64_t[CNT]; cr_assert_not_null(cntrs); for (unsigned i = 0; i < CNT; i++) cntrs[i] = tsc_now(&tsc); for (unsigned i = 1; i < CNT; i++) cr_assert_lt(cntrs[i - 1], cntrs[i]); delete cntrs; } Test(tsc, sleep) { int ret; double delta, duration = 1; struct timespec start, stop; struct Tsc tsc; uint64_t start_cycles, end_cycles; ret = tsc_init(&tsc); cr_assert_eq(ret, 0); clock_gettime(CLOCK_MONOTONIC, &start); start_cycles = tsc_now(&tsc); end_cycles = start_cycles + duration * tsc.frequency; while (tsc_now(&tsc) < end_cycles) ; clock_gettime(CLOCK_MONOTONIC, &stop); delta = time_delta(&start, &stop); cr_assert_float_eq(delta, duration, 1e-4, "Error: %f, Delta: %lf, Freq: %llu", delta - duration, delta, tsc.frequency); }