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/* Self tests for parallel_for_each
Copyright (C) 2021-2024 Free Software Foundation, Inc.
This file is part of GDB.
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/>. */
/* This file is divided in two parts:
- FOR_EACH-undefined, and
- FOR_EACH-defined.
The former includes the latter, more than once, with different values for
FOR_EACH. The FOR_EACH-defined part reads like a regular function. */
#ifndef FOR_EACH
#include "gdbsupport/selftest.h"
#include "gdbsupport/parallel-for.h"
#if CXX_STD_THREAD
#include "gdbsupport/thread-pool.h"
namespace selftests {
namespace parallel_for {
struct save_restore_n_threads
{
save_restore_n_threads ()
: n_threads (gdb::thread_pool::g_thread_pool->thread_count ())
{
}
~save_restore_n_threads ()
{
gdb::thread_pool::g_thread_pool->set_thread_count (n_threads);
}
int n_threads;
};
/* Define test_par using TEST in the FOR_EACH-defined part. */
#define TEST test_par
#define FOR_EACH gdb::parallel_for_each
#include "parallel-for-selftests.c"
#undef FOR_EACH
#undef TEST
/* Define test_seq using TEST in the FOR_EACH-defined part. */
#define TEST test_seq
#define FOR_EACH gdb::sequential_for_each
#include "parallel-for-selftests.c"
#undef FOR_EACH
#undef TEST
static void
test (int n_threads)
{
test_par (n_threads);
test_seq (n_threads);
}
static void
test_n_threads ()
{
test (0);
test (1);
test (3);
}
}
}
#endif /* CXX_STD_THREAD */
void _initialize_parallel_for_selftests ();
void
_initialize_parallel_for_selftests ()
{
#ifdef CXX_STD_THREAD
selftests::register_test ("parallel_for",
selftests::parallel_for::test_n_threads);
#endif /* CXX_STD_THREAD */
}
#else /* FOR_EACH */
static void
TEST (int n_threads)
{
save_restore_n_threads saver;
gdb::thread_pool::g_thread_pool->set_thread_count (n_threads);
#define NUMBER 10000
std::atomic<int> counter (0);
FOR_EACH (1, 0, NUMBER,
[&] (int start, int end)
{
counter += end - start;
});
SELF_CHECK (counter == NUMBER);
counter = 0;
FOR_EACH (1, 0, 0,
[&] (int start, int end)
{
counter += end - start;
});
SELF_CHECK (counter == 0);
#undef NUMBER
/* Check that if there are fewer tasks than threads, then we won't
end up with a null result. */
std::vector<std::unique_ptr<int>> intresults;
std::atomic<bool> any_empty_tasks (false);
FOR_EACH (1, 0, 1,
[&] (int start, int end)
{
if (start == end)
any_empty_tasks = true;
return std::make_unique<int> (end - start);
});
SELF_CHECK (!any_empty_tasks);
SELF_CHECK (std::all_of (intresults.begin (),
intresults.end (),
[] (const std::unique_ptr<int> &entry)
{
return entry != nullptr;
}));
}
#endif /* FOR_EACH */
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