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/* This testcase is part of GDB, the GNU debugger.
Copyright 2017-2023 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>. */
#include <stdio.h>
#include <omp.h>
omp_lock_t lock;
omp_lock_t lock2;
/* Enforce execution order between two threads using a lock. */
static void
omp_set_lock_in_order (int num, omp_lock_t *lock)
{
/* Ensure that thread num 0 first sets the lock. */
if (num == 0)
omp_set_lock (lock);
#pragma omp barrier
/* Block thread num 1 until it can set the lock. */
if (num == 1)
omp_set_lock (lock);
/* This bit here is guaranteed to be executed first by thread num 0, and
once thread num 0 unsets the lock, to be executed by thread num 1. */
;
}
/* Testcase for checking access to variables in a single / outer scope.
Make sure that variables not referred to in the parallel section are
accessible from the debugger. */
void
single_scope (void)
{
static int s1 = -41, s2 = -42, s3 = -43;
int i1 = 11, i2 = 12, i3 = 13;
#pragma omp parallel num_threads (2) shared (s1, i1) private (s2, i2)
{
int thread_num = omp_get_thread_num ();
omp_set_lock_in_order (thread_num, &lock);
s2 = 100 * (thread_num + 1) + 2;
i2 = s2 + 10;
#pragma omp critical
printf ("single_scope: thread_num=%d, s1=%d, i1=%d, s2=%d, i2=%d\n",
thread_num, s1, i1, s2, i2);
omp_unset_lock (&lock);
}
printf ("single_scope: s1=%d, s2=%d, s3=%d, i1=%d, i2=%d, i3=%d\n",
s1, s2, s3, i1, i2, i3);
}
static int file_scope_var = 9876;
/* Testcase for checking access to variables from parallel region
nested within more than one lexical scope. Of particular interest
are variables which are not referenced in the parallel section. */
void
multi_scope (void)
{
int i01 = 1, i02 = 2;
{
int i11 = 11, i12 = 12;
{
int i21 = -21, i22 = 22;
#pragma omp parallel num_threads (2) \
firstprivate (i01) \
shared (i11) \
private (i21)
{
int thread_num = omp_get_thread_num ();
omp_set_lock_in_order (thread_num, &lock);
i21 = 100 * (thread_num + 1) + 21;
#pragma omp critical
printf ("multi_scope: thread_num=%d, i01=%d, i11=%d, i21=%d\n",
thread_num, i01, i11, i21);
omp_unset_lock (&lock);
}
printf ("multi_scope: i01=%d, i02=%d, i11=%d, "
"i12=%d, i21=%d, i22=%d\n",
i01, i02, i11, i12, i21, i22);
}
}
}
/* Nested functions in C is a GNU extension. Some non-GNU compilers
define __GNUC__, but they don't support nested functions. So,
unfortunately, we can't use that for our test. */
#if HAVE_NESTED_FUNCTION_SUPPORT
/* Testcase for checking access of variables from within parallel
region in a lexically nested function. */
void
nested_func (void)
{
static int s1 = -42;
int i = 1, j = 2, k = 3;
void
foo (int p, int q, int r)
{
int x = 4;
{
int y = 5, z = 6;
#pragma omp parallel num_threads (2) shared (i, p, x) private (j, q, y)
{
int tn = omp_get_thread_num ();
omp_set_lock_in_order (tn, &lock);
j = 1000 * (tn + 1);
q = j + 1;
y = q + 1;
#pragma omp critical
printf ("nested_func: tn=%d: i=%d, p=%d, x=%d, j=%d, q=%d, y=%d\n",
tn, i, p, x, j, q, y);
omp_unset_lock (&lock);
}
}
}
foo (10, 11, 12);
i = 101; j = 102; k = 103;
foo (20, 21, 22);
}
#endif
/* Testcase for checking access to variables from within a nested parallel
region. */
void
nested_parallel (void)
{
int i = 1, j = 2;
int l = -1;
omp_set_nested (1);
omp_set_dynamic (0);
#pragma omp parallel num_threads (2) private (l)
{
int num = omp_get_thread_num ();
omp_set_lock_in_order (num, &lock);
int nthr = omp_get_num_threads ();
int off = num * nthr;
int k = off + 101;
l = off + 102;
#pragma omp parallel num_threads (2) shared (num)
{
int inner_num = omp_get_thread_num ();
omp_set_lock_in_order (inner_num, &lock2);
#pragma omp critical
printf ("nested_parallel (inner threads): outer thread num = %d, thread num = %d\n", num, inner_num);
omp_unset_lock (&lock2);
}
#pragma omp critical
printf ("nested_parallel (outer threads) %d: k = %d, l = %d\n", num, k, l);
omp_unset_lock (&lock);
}
}
int
main (int argc, char **argv)
{
omp_init_lock (&lock);
omp_init_lock (&lock2);
single_scope ();
multi_scope ();
#if HAVE_NESTED_FUNCTION_SUPPORT
nested_func ();
#endif
nested_parallel ();
omp_destroy_lock (&lock);
omp_destroy_lock (&lock2);
return 0;
}
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