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There's no good reason why these can't be code constants.
Especially given that, due to a bug, changes to the
"idle_queue.{min,long}_period" constants were not being passed onto the C++
code!
Here's why: those two prefs were specified as integers in all.js. But we used
AddFloatVarCache() to set up the reading of those prefs. libpref fakes floats
by storing them as strings and then converting them to floats when they are
read.
Which means that AddFloatVarCache() used to fail to get the value from all.js
-- because there's a type mismatch, int vs. string -- and instead use the
fallback default. That value is the same as the one in all.js, which is lucky.
But if someone changed the value in about:config to 100 (an integer), a similar
failure would have occured and the value used by the C++ code wouldn't be
updated!
Also note that idle_queue.max_timer_thread_bound did not have a value in
all.js.
What a mess!
--HG--
extra : rebase_source : 86f8fa905163803eb95007609c029e18c2c4f586