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+/* StarPU --- Runtime system for heterogeneous multicore architectures.
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+ *
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+ * Copyright (C) 2010-2021 Université de Bordeaux, CNRS (LaBRI UMR 5800), Inria
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+ *
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+ * StarPU is free software; you can redistribute it and/or modify
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+ * it under the terms of the GNU Lesser General Public License as published by
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+ * the Free Software Foundation; either version 2.1 of the License, or (at
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+ * your option) any later version.
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+ *
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+ * StarPU is distributed in the hope that it will be useful, but
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+ * WITHOUT ANY WARRANTY; without even the implied warranty of
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+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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+ *
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+ * See the GNU Lesser General Public License in COPYING.LGPL for more details.
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+ */
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+
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+#include <starpu.h>
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+#include "../helper.h"
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+
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+/*
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+ * Create a cycle of tasks with NULL codelet, using manual dependencies.
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+ * This is meant to try debugging tools with such a deadlock case.
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+ */
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+
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+#define N 4
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+
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+int main(int argc, char **argv)
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+{
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+ int i, ret;
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+
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+ ret = starpu_initialize(NULL, &argc, &argv);
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+ if (ret == -ENODEV) return STARPU_TEST_SKIPPED;
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+ STARPU_CHECK_RETURN_VALUE(ret, "starpu_init");
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+
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+ struct starpu_task **tasks = (struct starpu_task **) malloc(N*sizeof(struct starpu_task *));
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+
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+ for (i = 0; i < N; i++)
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+ {
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+ tasks[i] = starpu_task_create();
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+ tasks[i]->cl = NULL;
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+ }
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+
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+ for (i = 0; i < N; i++)
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+ {
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+ if (i > 0)
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+ starpu_task_declare_deps_array(tasks[i], 1, &tasks[i-1]);
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+ else
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+ starpu_task_declare_deps_array(tasks[i], 1, &tasks[N-1]);
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+ }
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+
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+ for (i = 0; i < N; i++)
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+ {
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+ ret = starpu_task_submit(tasks[i]);
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+ if (ret == -ENODEV) goto enodev;
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+ STARPU_CHECK_RETURN_VALUE(ret, "starpu_task_submit");
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+ }
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+
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+ starpu_task_wait_for_all();
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+
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+ starpu_shutdown();
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+ free(tasks);
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+
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+ return EXIT_SUCCESS;
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+
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+enodev:
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+ fprintf(stderr, "WARNING: No one can execute this task\n");
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+ /* yes, we do not perform the computation but we did detect that no one
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+ * could perform the kernel, so this is not an error from StarPU */
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+ starpu_shutdown();
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+ return STARPU_TEST_SKIPPED;
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+}
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