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Improve nstime_monotonic test coverage

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Enhance test_nstime_monotonic.
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guangli-dai 2026-07-27 16:35:44 -07:00 • committed by Guangli Dai
parent c5b082c470
commit 67bca6a629
1 changed files with 30 additions and 1 deletions
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31
test/unit/nstime.c
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@ -1,5 +1,7 @@
#include "test/jemalloc_test.h"
#include "jemalloc/internal/os.h"
extern uint64_t nstime_ms(const nstime_t *time);
extern void nstime_isubtract(nstime_t *time, uint64_t subtrahend);
@ -250,7 +252,34 @@ TEST_BEGIN(test_nstime_ms_since) {
TEST_END
TEST_BEGIN(test_nstime_monotonic) {
nstime_monotonic();
bool monotonic = nstime_monotonic();
/* This is a static platform property; it must not change mid-run. */
for (unsigned i = 0; i < 8; i++) {
expect_b_eq(nstime_monotonic(), monotonic,
"nstime_monotonic() should be stable across calls");
}
/*
* decay.c's decay_maybe_update_time() relies on nstime_monotonic():
* when true, it skips its backward-jump tolerance path and instead
* asserts time never goes backwards. Add tests for that assumption
* by stress testing here: sample os_time_get() (not nstime_update(),
* which silently clamps backward jumps and so would pass regardless
* of whether the underlying clock is really monotonic) back-to-back
* and confirm it never decreases.
*/
if (monotonic) {
nstime_t prev;
os_time_get(&prev);
for (unsigned i = 0; i < 10000; i++) {
nstime_t cur;
os_time_get(&cur);
expect_d_ge(nstime_compare(&cur, &prev), 0,
"Clock claiming to be monotonic went backwards");
nstime_copy(&prev, &cur);
}
}
}
TEST_END