1 // Copyright 2025 The Pigweed Authors
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License"); you may not
4 // use this file except in compliance with the License. You may obtain a copy of
5 // the License at
6 //
7 // https://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
11 // WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
12 // License for the specific language governing permissions and limitations under
13 // the License.
14 #pragma once
15
16 #ifdef __cplusplus
17
18 namespace pw {
19
20 /// Loops infinitely. Call as `pw_InfiniteLoop()` in C.
21 ///
22 /// Infinite loops without side effects are undefined behavior. Use
23 /// `pw::InfiniteLoop` in place of an empty `while (true) {}` or `for (;;) {}`.
InfiniteLoop()24 [[noreturn]] inline void InfiniteLoop() {
25 while (true) {
26 asm volatile("");
27 }
28 }
29
30 } // namespace pw
31
32 #else
33
34 #include "pw_preprocessor/compiler.h"
35
pw_InfiniteLoop(void)36 PW_NO_RETURN static inline void pw_InfiniteLoop(void) {
37 while (1) {
38 __asm__ volatile("");
39 }
40 }
41
42 #endif // __cplusplus
43