Viewing file:  loop-2.c (2.01 KB) -rw-r--r--
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/* Validate static scheduling iteration dispatch. We only test with
even thread distributions here; there are multiple valid solutions
for uneven thread distributions. */
/* { dg-require-effective-target sync_int_long } */
#include <omp.h>
#include <string.h>
#include <assert.h>
#include "libgomp_g.h"
#define N 360
static int data[N][2];
static int INCR, NTHR, CHUNK;
static void clean_data (void)
{
memset (data, -1, sizeof (data));
}
static void test_data (void)
{
int n, i, c, thr, iter, chunk;
chunk = CHUNK;
if (chunk == 0)
chunk = N / INCR / NTHR;
thr = iter = c = i = 0;
for (n = 0; n < N; ++n)
{
if (i == 0)
{
assert (data[n][0] == thr);
assert (data[n][1] == iter);
}
else
{
assert (data[n][0] == -1);
assert (data[n][1] == -1);
}
if (++i == INCR)
{
i = 0;
if (++c == chunk)
{
c = 0;
if (++thr == NTHR)
{
thr = 0;
++iter;
}
}
}
}
}
static void set_data (long i, int thr, int iter)
{
int old;
assert (i >= 0 && i < N);
old = __sync_lock_test_and_set (&data[i][0], thr);
assert (old == -1);
old = __sync_lock_test_and_set (&data[i][1], iter);
assert (old == -1);
}
static void f_static_1 (void *dummy)
{
int iam = omp_get_thread_num ();
long s0, e0, i, count = 0;
if (GOMP_loop_static_start (0, N, INCR, CHUNK, &s0, &e0))
do
{
for (i = s0; i < e0; i += INCR)
set_data (i, iam, count);
++count;
}
while (GOMP_loop_static_next (&s0, &e0));
GOMP_loop_end ();
}
static void test (void)
{
clean_data ();
GOMP_parallel_start (f_static_1, NULL, NTHR);
f_static_1 (NULL);
GOMP_parallel_end ();
test_data ();
}
int main()
{
omp_set_dynamic (0);
NTHR = 5;
INCR = 1, CHUNK = 0; /* chunk = 360 / 5 = 72 */
test ();
INCR = 4, CHUNK = 0; /* chunk = 360 / 4 / 5 = 18 */
test ();
INCR = 1, CHUNK = 4; /* 1 * 4 * 5 = 20 -> 360 / 20 = 18 iterations. */
test ();
INCR = 3, CHUNK = 4; /* 3 * 4 * 5 = 60 -> 360 / 60 = 6 iterations. */
test ();
return 0;
}
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