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8064bf3adf
New set of unit tests for the timing module, instead of just running the selftest function. The selftest function sometimes fails on a heavily loaded machine (such as a typical continuous integration system). Because of the all-in-one nature of the test and because the exact load pattern can be hard to reproduce, it is difficult to diagnose failures of CI runs with selftest. The new tests are more separated and I strove to point out potential failure modes in comments. * mbedtls_timing_hardclock: not tested. This function gives so few guarantees that there isn't much to test, and it is hard to test reliably because clock cycles don't easily relate to time in any remotely portable way. This function isn't used in the library anyway, it's only there for benchmark programs. * mbedtls_timing_get_timer: tested by setting a timer and verifying that it reaches its target, and by verifying that a timer started later than another always has a smaller elapsed time. * mbedtls_set_alarm: tested by setting an alarm, busy-waiting for it and measuring the elapsed time with a timer. * mbedtls_timing_set_delay, mbedtls_timing_get_delay: tested by setting a delay object and watching it go through its two delay values, using a timer to check that the delays are passed at the expected time. The tests pass under light to moderate load, but some of them can be defeated with sufficiently heavy load. This is unavoidable since the test process to be effectively suspended for any length of time, making us think that a timer has gone on for too long.
39 lines
660 B
Plaintext
39 lines
660 B
Plaintext
Timing: basic timer operation
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timing_timer_simple:
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Timing: timer reset
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timing_timer_reset:
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Timing: two parallel timers, delay 0
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timing_two_timers:0:
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Timing: two parallel timers, delay 100
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timing_two_timers:100:
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Timing: two parallel timers, delay 1000
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timing_two_timers:1000:
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Timing: two parallel timers, delay 10000
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timing_two_timers:10000:
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Timing: delay 0ms, 0ms
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timing_delay:0:0:
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Timing: delay 0ms, 50ms
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timing_delay:0:50:
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Timing: delay 50ms, 50ms
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timing_delay:50:50:
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Timing: delay 50ms, 100ms
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timing_delay:50:100:
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Timing: delay 50ms, 200ms
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timing_delay:50:200:
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Timing: alarm in 0 second
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timing_alarm:0:
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Timing: alarm in 1 second
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timing_alarm:1:
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