/*  * spin4.c * * * -------------------------------------------------------------------------- * *      Pthreads-win32 - POSIX Threads Library for Win32 *      Copyright(C) 1998 John E. Bossom *      Copyright(C) 1999,2005 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 * * -------------------------------------------------------------------------- * * Declare a static spinlock object, lock it, spin on it,  * and then unlock it again. */#include "test.h"#include <sys/timeb.h> pthread_spinlock_t lock = PTHREAD_SPINLOCK_INITIALIZER;struct _timeb currSysTimeStart;struct _timeb currSysTimeStop;#define GetDurationMilliSecs(_TStart, _TStop) ((_TStop.time*1000+_TStop.millitm) \					       - (_TStart.time*1000+_TStart.millitm))static int washere = 0;void * func(void * arg){  _ftime(&currSysTimeStart);  washere = 1;  assert(pthread_spin_lock(&lock) == 0);  assert(pthread_spin_unlock(&lock) == 0);  _ftime(&currSysTimeStop);  return (void *) GetDurationMilliSecs(currSysTimeStart, currSysTimeStop);} intmain(){  long result = 0;  pthread_t t;  int CPUs;  struct _timeb sysTime;  if ((CPUs = pthread_num_processors_np()) == 1)    {      printf("Test not run - it requires multiple CPUs.\n");	exit(0);    }  assert(pthread_spin_lock(&lock) == 0);  assert(pthread_create(&t, NULL, func, NULL) == 0);  while (washere == 0)    {      sched_yield();    }  do    {      sched_yield();      _ftime(&sysTime);    }  while (GetDurationMilliSecs(currSysTimeStart, sysTime) <= 1000);  assert(pthread_spin_unlock(&lock) == 0);  assert(pthread_join(t, (void **) &result) == 0);  assert(result > 1000);  assert(pthread_spin_destroy(&lock) == 0);  assert(washere == 1);  return 0;}