/* * benchtest5.c * * * -------------------------------------------------------------------------- * * Pthreads-win32 - POSIX Threads Library for Win32 * Copyright(C) 1998 John E. Bossom * Copyright(C) 1999,2004 Pthreads-win32 contributors * * Contact Email: rpj@callisto.canberra.edu.au * * The current list of contributors is contained * in the file CONTRIBUTORS included with the source * code distribution. The list can also be seen at the * following World Wide Web location: * http://sources.redhat.com/pthreads-win32/contributors.html * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library in the file COPYING.LIB; * if not, write to the Free Software Foundation, Inc., * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA * * -------------------------------------------------------------------------- * * Measure time taken to complete an elementary operation. * * - Semaphore * Single thread iteration over post/wait for a semaphore. */ #include "test.h" #include <sys/timeb.h> #ifdef __GNUC__ #include <stdlib.h> #endif #include "benchtest.h" #define ITERATIONS 10000000L sem_t sema; struct _timeb currSysTimeStart; struct _timeb currSysTimeStop; long durationMilliSecs; long overHeadMilliSecs = 0; int one = 1; int zero = 0; #define GetDurationMilliSecs(_TStart, _TStop) ((_TStop.time*1000+_TStop.millitm) \ - (_TStart.time*1000+_TStart.millitm)) /* * Dummy use of j, otherwise the loop may be removed by the optimiser * when doing the overhead timing with an empty loop. */ #define TESTSTART \ { int i, j = 0, k = 0; _ftime(&currSysTimeStart); for (i = 0; i < ITERATIONS; i++) { j++; #define TESTSTOP \ }; _ftime(&currSysTimeStop); if (j + k == i) j++; } void reportTest (char * testNameString) { durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs; printf( "%-45s %15ld %15.3f\n", testNameString, durationMilliSecs, (float) durationMilliSecs * 1E3 / ITERATIONS); } int main (int argc, char *argv[]) { printf( "=============================================================================\n"); printf( "\nOperations on a semaphore.\n%ld iterations\n\n", ITERATIONS); printf( "%-45s %15s %15s\n", "Test", "Total(msec)", "average(usec)"); printf( "-----------------------------------------------------------------------------\n"); /* * Time the loop overhead so we can subtract it from the actual test times. */ TESTSTART assert(1 == one); TESTSTOP durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs; overHeadMilliSecs = durationMilliSecs; /* * Now we can start the actual tests */ assert(sem_init(&sema, 0, 0) == 0); TESTSTART assert(sem_post(&sema) == zero); TESTSTOP assert(sem_destroy(&sema) == 0); reportTest("Post"); assert(sem_init(&sema, 0, ITERATIONS) == 0); TESTSTART assert(sem_wait(&sema) == zero); TESTSTOP assert(sem_destroy(&sema) == 0); reportTest("Wait without blocking"); /* * Time the loop overhead so we can subtract it from the actual test times. */ TESTSTART assert(1 == one); assert(1 == one); TESTSTOP durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs; overHeadMilliSecs = durationMilliSecs; /* * Now we can start the actual tests */ assert(sem_init(&sema, 0, 0) == 0); TESTSTART assert(sem_post(&sema) == zero); assert(sem_wait(&sema) == zero); TESTSTOP assert(sem_destroy(&sema) == 0); reportTest("Post then Wait without blocking"); assert(sem_init(&sema, 0, 1) == 0); TESTSTART assert(sem_wait(&sema) == zero); assert(sem_post(&sema) == zero); TESTSTOP assert(sem_destroy(&sema) == 0); reportTest("Wait then Post without blocking"); printf( "=============================================================================\n"); /* * End of tests. */ return 0; }