1 /* 2 * Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz> 3 * Copyright (c) 2013 Stanislav Kholmanskikh <stanislav.kholmanskikh@oracle.com> 4 * Copyright (c) 2010 Ngie Cooper <yaneurabeya@gmail.com> 5 * Copyright (c) 2008 Mike Frysinger <vapier@gmail.com> 6 * 7 * This program is free software: you can redistribute it and/or modify 8 * it under the terms of the GNU General Public License as published by 9 * the Free Software Foundation, either version 2 of the License, or 10 * (at your option) any later version. 11 * 12 * This program is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 * GNU General Public License for more details. 16 * 17 * You should have received a copy of the GNU General Public License 18 * along with this program. If not, see <http://www.gnu.org/licenses/>. 19 */ 20 21 #ifndef TST_COMMON_H__ 22 #define TST_COMMON_H__ 23 24 #define LTP_ATTRIBUTE_NORETURN __attribute__((noreturn)) 25 #define LTP_ATTRIBUTE_UNUSED __attribute__((unused)) 26 #define LTP_ATTRIBUTE_UNUSED_RESULT __attribute__((warn_unused_result)) 27 28 #ifndef ARRAY_SIZE 29 # define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0])) 30 #endif 31 32 /* Round x to the next multiple of a. 33 * a should be a power of 2. 34 */ 35 #define LTP_ALIGN(x, a) __LTP_ALIGN_MASK(x, (typeof(x))(a) - 1) 36 #define __LTP_ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask)) 37 38 /** 39 * TST_RETRY_FUNC() - Repeatedly retry a function with an increasing delay. 40 * @FUNC - The function which will be retried 41 * @ERET - The value returned from @FUNC on success 42 * 43 * This macro will call @FUNC in a loop with a delay between retries. If @FUNC 44 * returns @ERET then the loop exits. The delay between retries starts at one 45 * micro second and is then doubled each iteration until it exceeds one second 46 * (the total time sleeping will be aproximately one second as well). When the 47 * delay exceeds one second tst_brk() is called. 48 */ 49 #define TST_RETRY_FUNC(FUNC, ERET) \ 50 TST_RETRY_FN_EXP_BACKOFF(FUNC, ERET, 1) 51 52 #define TST_RETRY_FN_EXP_BACKOFF(FUNC, ERET, MAX_DELAY) \ 53 ({ int tst_delay_ = 1; \ 54 for (;;) { \ 55 typeof(FUNC) tst_ret_ = FUNC; \ 56 if (tst_ret_ == ERET) \ 57 break; \ 58 if (tst_delay_ < MAX_DELAY * 1000000) { \ 59 usleep(tst_delay_); \ 60 tst_delay_ *= 2; \ 61 } else { \ 62 tst_brk(TBROK, #FUNC" timed out"); \ 63 } \ 64 } \ 65 ERET; \ 66 }) 67 68 #define TST_BRK_SUPPORTS_ONLY_TCONF_TBROK(condition) \ 69 do { ((void)sizeof(char[1 - 2 * !!(condition)])); } while (0) 70 71 #endif /* TST_COMMON_H__ */ 72