RTEMS
t-test-busy.c
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1 /* SPDX-License-Identifier: BSD-2-Clause */
2 
11 /*
12  * Copyright (C) 2014, 2020 embedded brains GmbH (http://www.embedded-brains.de)
13  *
14  * Redistribution and use in source and binary forms, with or without
15  * modification, are permitted provided that the following conditions
16  * are met:
17  * 1. Redistributions of source code must retain the above copyright
18  * notice, this list of conditions and the following disclaimer.
19  * 2. Redistributions in binary form must reproduce the above copyright
20  * notice, this list of conditions and the following disclaimer in the
21  * documentation and/or other materials provided with the distribution.
22  *
23  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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34  */
35 
36 #ifdef HAVE_CONFIG_H
37 #include "config.h"
38 #endif
39 
40 #include <rtems/test.h>
41 
42 /*
43  * It is important that we actually use the same T_busy() function at the
44  * various places. So, the compiler must not inline this function. Take care
45  * of link time optimization.
46  */
47 __attribute__((__noinline__)) void
48 T_busy(uint_fast32_t count)
49 {
50  uint_fast32_t i;
51 
52  i = 0;
53 
54  do {
55  __asm__ volatile ("");
56  ++i;
57  } while (i < count);
58 }