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helpers: Introduce retry macro

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Introduce a macro retry(attempts, condition, expr) for retrying a
condition, which is extensively used in coreboot.

Example usage:

 if (!retry(3, read32(REG) == 0, mdelay(1))
         printk(BIOS_ERR, "Error waiting for REG to be 0\n");

BUG=none
TEST=make tests/commonlib/bsd/helpers-test
TEST=emerge-cherry coreboot
BRANCH=none

Change-Id: I421e4dcab949616bd68b3a14231da744b9f74eeb
Signed-off-by: Yu-Ping Wu <yupingso@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/55778
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Yu-Ping Wu
2021-06-22 17:40:01 +08:00
committed by Patrick Georgi
parent 6cd4d32039
commit fc3576ab06
4 changed files with 83 additions and 0 deletions
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5
tests/commonlib/bsd/Makefile.inc Normal file
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# SPDX-License-Identifier: GPL-2.0-only
tests-y += helpers-test
helpers-test-srcs += tests/commonlib/bsd/helpers-test.c

41
tests/commonlib/bsd/helpers-test.c Normal file
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/* SPDX-License-Identifier: GPL-2.0-only */
#include <commonlib/bsd/helpers.h>
#include <tests/test.h>
static void func(void)
{
function_called();
}
static void test_retry(void **state)
{
int count;
/* 2-argument form */
count = 0;
assert_true(retry(3, ++count == 1));
count = 0;
assert_true(retry(3, ++count == 3));
count = 0;
assert_false(retry(3, ++count == 4));
/* 3-argument form */
expect_function_calls(func, 9);
assert_null(retry(10, NULL, func()));
assert_int_equal(retry(10, 999, func()), 999);
count = 0;
expect_function_calls(func, 3);
assert_true(retry(10, ++count == 4, func()));
}
int main(void)
{
const struct CMUnitTest tests[] = {
cmocka_unit_test(test_retry),
};
return cmocka_run_group_tests(tests, NULL, NULL);
}