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1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz>
4  * Copyright (c) 2013 Stanislav Kholmanskikh <stanislav.kholmanskikh@oracle.com>
5  * Copyright (c) 2010 Ngie Cooper <yaneurabeya@gmail.com>
6  * Copyright (c) 2008 Mike Frysinger <vapier@gmail.com>
7  */
8 
9 #ifndef TST_COMMON_H__
10 #define TST_COMMON_H__
11 
12 #define LTP_ATTRIBUTE_NORETURN		__attribute__((noreturn))
13 #define LTP_ATTRIBUTE_UNUSED		__attribute__((unused))
14 #define LTP_ATTRIBUTE_UNUSED_RESULT	__attribute__((warn_unused_result))
15 
16 #ifndef ARRAY_SIZE
17 # define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
18 #endif
19 
20 /* Round x to the next multiple of a.
21  * a should be a power of 2.
22  */
23 #define LTP_ALIGN(x, a)    __LTP_ALIGN_MASK(x, (typeof(x))(a) - 1)
24 #define __LTP_ALIGN_MASK(x, mask)  (((x) + (mask)) & ~(mask))
25 
26 /**
27  * TST_RETRY_FUNC() - Repeatedly retry a function with an increasing delay.
28  * @FUNC - The function which will be retried
29  * @ERET - The value returned from @FUNC on success
30  *
31  * This macro will call @FUNC in a loop with a delay between retries. If @FUNC
32  * returns @ERET then the loop exits. The delay between retries starts at one
33  * micro second and is then doubled each iteration until it exceeds one second
34  * (the total time sleeping will be approximately one second as well). When the
35  * delay exceeds one second tst_brk() is called.
36  */
37 #define TST_RETRY_FUNC(FUNC, ERET) \
38 	TST_RETRY_FN_EXP_BACKOFF(FUNC, ERET, 1)
39 
40 #define TST_RETRY_FN_EXP_BACKOFF(FUNC, ERET, MAX_DELAY)	\
41 ({	unsigned int tst_delay_, tst_max_delay_;			\
42 	tst_delay_ = 1;							\
43 	tst_max_delay_ = tst_multiply_timeout(MAX_DELAY * 1000000);	\
44 	for (;;) {							\
45 		typeof(FUNC) tst_ret_ = FUNC;				\
46 		if (tst_ret_ == ERET)					\
47 			break;						\
48 		if (tst_delay_ < tst_max_delay_) {			\
49 			usleep(tst_delay_);				\
50 			tst_delay_ *= 2;				\
51 		} else {						\
52 			tst_brk(TBROK, #FUNC" timed out");		\
53 		}							\
54 	}								\
55 	ERET;								\
56 })
57 
58 #define TST_BRK_SUPPORTS_ONLY_TCONF_TBROK(condition) \
59 	do { ((void)sizeof(char[1 - 2 * !!(condition)])); } while (0)
60 
61 #endif /* TST_COMMON_H__ */
62