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spin4.c    104 lines (86 with data), 2.9 kB

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/*
* 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;
PTW32_STRUCT_TIMEB currSysTimeStart;
PTW32_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)
{
PTW32_FTIME(&currSysTimeStart);
washere = 1;
assert(pthread_spin_lock(&lock) == 0);
assert(pthread_spin_unlock(&lock) == 0);
PTW32_FTIME(&currSysTimeStop);
return (void *)(size_t)GetDurationMilliSecs(currSysTimeStart, currSysTimeStop);
}
int
main()
{
void* result = (void*)0;
pthread_t t;
int CPUs;
PTW32_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();
PTW32_FTIME(&sysTime);
}
while (GetDurationMilliSecs(currSysTimeStart, sysTime) <= 1000);
assert(pthread_spin_unlock(&lock) == 0);
assert(pthread_join(t, &result) == 0);
assert((int)(size_t)result > 1000);
assert(pthread_spin_destroy(&lock) == 0);
assert(washere == 1);
return 0;
}