Zephyr API Documentation 4.0.0-rc2
A Scalable Open Source RTOS
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types.h
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1/*
2 * Copyright (c) 2017 Linaro Limited
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 */
6
7#ifndef ZEPHYR_INCLUDE_ZEPHYR_TYPES_H_
8#define ZEPHYR_INCLUDE_ZEPHYR_TYPES_H_
9
10#include <stddef.h>
11#include <stdint.h>
12
13#ifdef __cplusplus
14extern "C" {
15#endif
16
17/*
18 * A type with strong alignment requirements, similar to C11 max_align_t. It can
19 * be used to force alignment of data structures allocated on the stack or as
20 * return * type for heap allocators.
21 */
22typedef union {
23 long long thelonglong;
24 long double thelongdouble;
25 uintmax_t theuintmax_t;
26 size_t thesize_t;
27 uintptr_t theuintptr_t;
28 void *thepvoid;
29 void (*thepfunc)(void);
30} z_max_align_t;
31
32/*
33 * Thread local variables are declared with different keywords depending on
34 * which C/C++ standard that is used. C++11 and C23 uses "thread_local" whilst
35 * C11 uses "_Thread_local". Previously the GNU "__thread" keyword was used
36 * which is the same in both gcc and g++.
37 */
38#ifndef Z_THREAD_LOCAL
39#if defined(__cplusplus) && (__cplusplus) >= 201103L /* C++11 */
40#define Z_THREAD_LOCAL thread_local
41#elif defined(__STDC_VERSION__) && (__STDC_VERSION__) >= 202311L /* C23 */
42#define Z_THREAD_LOCAL thread_local
43#elif defined(__STDC_VERSION__) && (__STDC_VERSION__) >= 201112L /* C11 */
44#define Z_THREAD_LOCAL _Thread_local
45#else /* Default back to old behavior which used the GNU keyword. */
46#define Z_THREAD_LOCAL __thread
47#endif
48#endif /* Z_THREAD_LOCAL */
49
50#ifdef __cplusplus
51/* Zephyr requires an int main(void) signature with C linkage for the application main if present */
52extern int main(void);
53#endif
54
55#ifdef __cplusplus
56}
57#endif
58
59#endif /* ZEPHYR_INCLUDE_ZEPHYR_TYPES_H_ */
__UINTPTR_TYPE__ uintptr_t
Definition stdint.h:105
__UINT64_TYPE__ uintmax_t
Definition stdint.h:92