Learn how easy it is to sync an existing GitHub or Google Code repo to a SourceForge project! See Demo

Close

[e51657]: tests / openmp1.c Maximize Restore History

Download this file

openmp1.c    141 lines (115 with data), 2.7 kB

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
#include <stdio.h>
#include <stdlib.h>
#ifdef _OPENMP
# include <omp.h>
#endif
#include <pthread.h>
enum {
Size = 10000
};
const int ShouldSum = (Size-1)*Size/2;
short Verbose = 1;
short ThreadOK[3] = {0,0,0}; // Main, Thread1, Thread2
// Thread
void *_thread(void* Id) {
int i;
int x[Size];
#ifdef _OPENMP
# pragma omp parallel for
#endif
for ( i = 0; i < Size; i++ ) {
#ifdef _OPENMP
if (Verbose && i%1000==0) {
int tid = omp_get_thread_num();
# pragma omp critical
printf("thread %d : tid %d handles %d\n",(int)Id,tid,i);
}
#endif
x[i] = i;
}
int Sum=0;
for ( i = 0; i < Size; i++ ) {
Sum += x[i];
}
if (Verbose) {
#ifdef _OPENMP
# pragma omp critical
#endif
printf("Id %d : %s : %d(should be %d)\n",(int)Id, __FUNCTION__, Sum,ShouldSum);
}
if (Sum == ShouldSum) ThreadOK[(int)Id] = 1;
return NULL;
}
// MainThread
void MainThread() {
int i;
#ifdef _OPENMP
# pragma omp parallel for
#endif
for ( i = 0; i < 4; i++ ) {
#ifdef _OPENMP
int tid = omp_get_thread_num();
# pragma omp critical
printf("Main : tid %d\n",tid);
_thread((void *)tid);
#endif
}
return;
}
// Comment in/out for checking the effect of multiple threads.
#define SPAWN_THREADS
// main
int main(int argc, char *argv[]) {
if (argc>1) Verbose = 1;
#ifdef _OPENMP
omp_set_nested(-1);
printf("%s%s%s\n", "Nested parallel blocks are ", omp_get_nested()?" ":"NOT ", "supported.");
#endif
MainThread();
#ifdef SPAWN_THREADS
{
pthread_t a_thr;
pthread_t b_thr;
int status;
printf("%s:%d - %s - a_thr:%p - b_thr:%p\n",
__FILE__,__LINE__,__FUNCTION__,a_thr.p,b_thr.p);
status = pthread_create(&a_thr, NULL, _thread, (void*) 1 );
if ( status != 0 ) {
printf("Failed to create thread 1\n");
return (-1);
}
status = pthread_create(&b_thr, NULL, _thread, (void*) 2 );
if ( status != 0 ) {
printf("Failed to create thread 2\n");
return (-1);
}
status = pthread_join(a_thr, NULL);
if ( status != 0 ) {
printf("Failed to join thread 1\n");
return (-1);
}
printf("Joined thread1\n");
status = pthread_join(b_thr, NULL);
if ( status != 0 ) {
printf("Failed to join thread 2\n");
return (-1);
}
printf("Joined thread2\n");
}
#endif // SPAWN_THREADS
short OK = 0;
// Check that we have OpenMP before declaring things OK formally.
#ifdef _OPENMP
OK = 1;
{
short i;
for (i=0;i<3;i++) OK &= ThreadOK[i];
}
if (OK) printf("OMP : All looks good\n");
else printf("OMP : Error\n");
#else
printf("OpenMP seems not enabled ...\n");
#endif
return OK?0:1;
}
//g++ -fopenmp omp_test.c -o omp_test -lpthread