xref: /openbsd-src/gnu/gcc/libgomp/testsuite/libgomp.c/appendix-a/a.4.1.c (revision 404b540a9034ac75a6199ad1a32d1bbc7a0d4210)
1*404b540aSrobert /* { dg-do run } */
2*404b540aSrobert 
3*404b540aSrobert #include <omp.h>
4*404b540aSrobert extern void abort (void);
5*404b540aSrobert void
subdomain(float * x,int istart,int ipoints)6*404b540aSrobert subdomain (float *x, int istart, int ipoints)
7*404b540aSrobert {
8*404b540aSrobert   int i;
9*404b540aSrobert   for (i = 0; i < ipoints; i++)
10*404b540aSrobert     x[istart + i] = 123.456;
11*404b540aSrobert }
12*404b540aSrobert 
13*404b540aSrobert void
sub(float * x,int npoints)14*404b540aSrobert sub (float *x, int npoints)
15*404b540aSrobert {
16*404b540aSrobert   int iam, nt, ipoints, istart;
17*404b540aSrobert #pragma omp parallel default(shared) private(iam,nt,ipoints,istart)
18*404b540aSrobert   {
19*404b540aSrobert     iam = omp_get_thread_num ();
20*404b540aSrobert     nt = omp_get_num_threads ();
21*404b540aSrobert     ipoints = npoints / nt;	/* size of partition */
22*404b540aSrobert     istart = iam * ipoints;	/* starting array index */
23*404b540aSrobert     if (iam == nt - 1)		/* last thread may do more */
24*404b540aSrobert       ipoints = npoints - istart;
25*404b540aSrobert     subdomain (x, istart, ipoints);
26*404b540aSrobert   }
27*404b540aSrobert }
28*404b540aSrobert int
main()29*404b540aSrobert main ()
30*404b540aSrobert {
31*404b540aSrobert   int i;
32*404b540aSrobert   float array[10000];
33*404b540aSrobert   sub (array, 10000);
34*404b540aSrobert   for (i = 0; i < 10000; i++)
35*404b540aSrobert     if (array[i] < 123.45 || array[i] > 123.46)
36*404b540aSrobert       abort ();
37*404b540aSrobert   return 0;
38*404b540aSrobert }
39