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During FSM design for osmo-msc, I noticed that the current behavior that
keep_timer=true doesn't guarantee a running timer can make FSM design a bit
complex, especially when using osmo_tdef for timeout definitions.
A desirable keep_timer=true behavior is one that keeps the previous timer
running, but starts a timer if no timer is running yet.
The simplest example is: a given state repeatedly transitions back to itself,
but wants to set a timeout only on first entering, avoiding to restart the
timeout on re-entering.
Another example is a repeated transition between two or more states, where the
first time we enter this group a timeout should start, but it should not
restart from scratch on every transition.
When using osmo_tdef timeout definitions for this, so far separate meaningless
states have to be introduced that merely set a fixed timeout.
To simplify, add osmo_fsm_inst_state_chg_keep_or_start_timer(), and use this in
osmo_tdef_fsm_inst_state_chg() when both keep_timer == true *and* T != 0.
In tdef_test.ok, the changes show that on first entering state L, the previous
T=1 is now kept with a large remaining timeout. When entering state L from O,
where no timer was running, this time L's T123 is started.
Change-Id: Id647511a4b18e0c4de0e66fb1f35dc9adb9177db
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Always call osmo_tdef_fsm_inst_state_chg(), also when no timeout is defined.
When there is no timeout defined for a state, tdef_test.c tries to be smart and
print different output. In that mess, I missed the fact that
osmo_tdef_fsm_inst_state_chg() isn't always called as it should. In the same
mess, the resulting state was never printed until the preceding patch, which
helped to hide this bug.
Change-Id: I1d953d99854422bff8eb32f051e9c6147bc836b6
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- Always print the state after a state transition.
This shows that actually state transitions are missing for states that have
no timer defined. This is a bug in tdef_test.c, to be fixed subsequently.
- Instead of total time passed since start, print the individual fake time
intervals. Omit initial useless zero fake time advance.
- Add two more state transitions, back out from and into a state that has no
timeout set.
Change-Id: Icb31af96d37741e256ff07868f3d4f5c48cdda74
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Run INT_MAX and ULONG_MAX related tests only manually, remove from automatic
testing. This will hopefully fix recent build failures on various platforms.
Add a 64 bit output example for expected results when invoking
`./tdef_test range'. This is not checked automatically and merely serves for
manual reference.
For vty tests, use 32bit max values instead of INT_MAX and ULONG_MAX.
Change-Id: I6242243bde1d7ddebb858512a1f0b07f4ec3e5c2
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