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/*
* benchtest3.c
*
* Measure time taken to complete an elementary operation.
*
* - Mutex
* Single thread iteration over a trylock on a locked mutex for each mutex type.
*/
#include "test.h"
#include <sys/timeb.h>
#ifdef __GNUC__
#include <stdlib.h>
#endif
#include "benchtest.h"
#define PTW32_MUTEX_TYPES
#define ITERATIONS 10000000L
pthread_mutex_t mx;
old_mutex_t ox;
pthread_mutexattr_t ma;
struct _timeb currSysTimeStart;
struct _timeb currSysTimeStop;
long durationMilliSecs;
long overHeadMilliSecs = 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 *
trylockThread (void * arg)
{
TESTSTART
(void) pthread_mutex_trylock(&mx);
TESTSTOP
return NULL;
}
void *
oldTrylockThread (void * arg)
{
TESTSTART
(void) old_mutex_trylock(&ox);
TESTSTOP
return NULL;
}
void
runTest (char * testNameString, int mType)
{
pthread_t t;
#ifdef PTW32_MUTEX_TYPES
(void) pthread_mutexattr_settype(&ma, mType);
#endif
assert(pthread_mutex_init(&mx, &ma) == 0);
assert(pthread_mutex_lock(&mx) == 0);
assert(pthread_create(&t, NULL, trylockThread, 0) == 0);
assert(pthread_join(t, NULL) == 0);
assert(pthread_mutex_unlock(&mx) == 0);
assert(pthread_mutex_destroy(&mx) == 0);
durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs;
printf( "%-40s %15ld %15.3f\n",
testNameString,
durationMilliSecs,
(float) durationMilliSecs * 1E3 / ITERATIONS);
}
int
main (int argc, char *argv[])
{
pthread_t t;
assert(pthread_mutexattr_init(&ma) == 0);
printf( "========================================================================\n");
printf( "\nTrylock on a locked mutex.\n");
printf( "%ld iterations.\n\n", ITERATIONS);
printf( "%-40s %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
TESTSTOP
durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs;
overHeadMilliSecs = durationMilliSecs;
old_mutex_use = OLD_WIN32CS;
assert(old_mutex_init(&ox, NULL) == 0);
assert(old_mutex_lock(&ox) == 0);
assert(pthread_create(&t, NULL, oldTrylockThread, 0) == 0);
assert(pthread_join(t, NULL) == 0);
assert(old_mutex_unlock(&ox) == 0);
assert(old_mutex_destroy(&ox) == 0);
durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs;
printf( "%-40s %15ld %15.3f\n",
"PT Mutex using a Critical Section (WNT)",
durationMilliSecs,
(float) durationMilliSecs * 1E3 / ITERATIONS);
old_mutex_use = OLD_WIN32MUTEX;
assert(old_mutex_init(&ox, NULL) == 0);
assert(old_mutex_lock(&ox) == 0);
assert(pthread_create(&t, NULL, oldTrylockThread, 0) == 0);
assert(pthread_join(t, NULL) == 0);
assert(old_mutex_unlock(&ox) == 0);
assert(old_mutex_destroy(&ox) == 0);
durationMilliSecs = GetDurationMilliSecs(currSysTimeStart, currSysTimeStop) - overHeadMilliSecs;
printf( "%-40s %15ld %15.3f\n",
"PT Mutex using a Win32 Mutex (W9x)",
durationMilliSecs,
(float) durationMilliSecs * 1E3 / ITERATIONS);
printf( "........................................................................\n");
/*
* Now we can start the actual tests
*/
#ifdef PTW32_MUTEX_TYPES
runTest("PTHREAD_MUTEX_DEFAULT (W9x,WNT)", PTHREAD_MUTEX_DEFAULT);
runTest("PTHREAD_MUTEX_NORMAL (W9x,WNT)", PTHREAD_MUTEX_NORMAL);
runTest("PTHREAD_MUTEX_ERRORCHECK (W9x,WNT)", PTHREAD_MUTEX_ERRORCHECK);
runTest("PTHREAD_MUTEX_RECURSIVE (W9x,WNT)", PTHREAD_MUTEX_RECURSIVE);
#else
runTest("Non-blocking lock", 0);
#endif
printf( "========================================================================\n");
/*
* End of tests.
*/
pthread_mutexattr_destroy(&ma);
return 0;
}
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