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1.0.15.20: refactor "system locks" framework, one TIMER buglet
* Choose the degree of GC/interrupt suppression at compile-time. * Default is not to allow interrupts at all, callers which need WITH-INTERRUPTS to work can now specify :ALLOW-WITH-INTERRUPTS. * Should fix reported Stumpwm crashes due to attempts to recursively obtain *SCHEDULER-LOCK*. (Caused by SIGALRM interrupting GET-MUTEX inside the call to %TIMER-CANCEL-FUNCTION, which led to recursive entry to WITH-SCHEDULER-LOCK.) * Don't reschedule timers for dead threads. * Three new test-cases for timers, which (1) represent my failing attempts to trigger the Stumpwm bug described above (2) led to noticing the rescheduling promblem (3) fail horribly on OS X Tiger -- not sure if this is our or Darwin's problem...
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