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> I don't know if it can fix the issue, but you may see my issue #23428: "Use the monotonic clock for thread conditions on POSIX platforms".
pthread_condattr_setclock() is declared in the Android API 21 headers.
When a monotonic clock is set for pthread_cond_timedwait(), one could measure the monotonic time elapsed to execute the instructions from _PyTime_monotonic() to the setting of the ts fields in PyCOND_TIMEDWAIT(), i.e the time to execute those statements taken from your patch:
#ifdef MONOTONIC
 _PyTime_monotonic(&deadline);
#else
 _PyTime_gettimeofday(&deadline);
#endif
 /* TODO: add overflow and truncation checks */
 assert(us <= LONG_MAX);
 deadline.tv_usec += (long)us;
 deadline.tv_sec += deadline.tv_usec / 1000000;
 deadline.tv_usec %= 1000000;
and prevent gil_interval to be set below that measured value. This would solve the problem for this soooo slow emulator. _PyTime_monotonic() does not exist, is this _PyTime_GetMonotonicClock() ? So I did not try to test it, not knowing the status of your patch.
IMHO PyCOND_TIMEDWAIT() should use a monotonic clock when available.