/*
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* Copyright (c) 2016 Cyril Hrubis <chrubis@suse.cz>
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* Copyright (c) 2013 Stanislav Kholmanskikh <stanislav.kholmanskikh@oracle.com>
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* Copyright (c) 2010 Ngie Cooper <yaneurabeya@gmail.com>
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* Copyright (c) 2008 Mike Frysinger <vapier@gmail.com>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TST_COMMON_H__
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#define TST_COMMON_H__
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#define LTP_ATTRIBUTE_NORETURN __attribute__((noreturn))
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#define LTP_ATTRIBUTE_UNUSED __attribute__((unused))
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#define LTP_ATTRIBUTE_UNUSED_RESULT __attribute__((warn_unused_result))
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#ifndef ARRAY_SIZE
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# define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
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#endif
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/* Round x to the next multiple of a.
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* a should be a power of 2.
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*/
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#define LTP_ALIGN(x, a) __LTP_ALIGN_MASK(x, (typeof(x))(a) - 1)
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#define __LTP_ALIGN_MASK(x, mask) (((x) + (mask)) & ~(mask))
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/**
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* TST_RETRY_FUNC() - Repeatedly retry a function with an increasing delay.
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* @FUNC - The function which will be retried
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* @ERET - The value returned from @FUNC on success
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*
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* This macro will call @FUNC in a loop with a delay between retries. If @FUNC
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* returns @ERET then the loop exits. The delay between retries starts at one
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* micro second and is then doubled each iteration until it exceeds one second
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* (the total time sleeping will be aproximately one second as well). When the
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* delay exceeds one second tst_brk() is called.
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*/
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#define TST_RETRY_FUNC(FUNC, ERET) \
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TST_RETRY_FN_EXP_BACKOFF(FUNC, ERET, 1)
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#define TST_RETRY_FN_EXP_BACKOFF(FUNC, ERET, MAX_DELAY) \
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({ int tst_delay_ = 1; \
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for (;;) { \
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typeof(FUNC) tst_ret_ = FUNC; \
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if (tst_ret_ == ERET) \
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break; \
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if (tst_delay_ < MAX_DELAY * 1000000) { \
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usleep(tst_delay_); \
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tst_delay_ *= 2; \
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} else { \
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tst_brk(TBROK, #FUNC" timed out"); \
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} \
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} \
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ERET; \
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})
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#define TST_BRK_SUPPORTS_ONLY_TCONF_TBROK(condition) \
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do { ((void)sizeof(char[1 - 2 * !!(condition)])); } while (0)
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#endif /* TST_COMMON_H__ */
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