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| Keybuk | morning | 10:47 |
|---|---|---|
| mdales | morning Keybuk | 10:48 |
| mdales | thanks for your help yesterday, my system seems to be doing what I want now :) | 10:48 |
| Keybuk | cool :) no problem | 10:49 |
| mdales | thought I'd loiter for a bit still as I learned a bit from just watching the general chat here yesterday | 10:49 |
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| Keybuk | hmm | 11:53 |
| Keybuk | action reload script | 11:53 |
| Keybuk | ... | 11:53 |
| Keybuk | end script | 11:53 |
| Keybuk | action reload on some-event | 11:53 |
| Keybuk | syntax could use some work there :-/ | 11:53 |
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| Keybuk | action reload | 01:24 |
| Keybuk | on some-event | 01:24 |
| Keybuk | script | 01:25 |
| Keybuk | .. | 01:25 |
| Keybuk | end script | 01:25 |
| Keybuk | end action | 01:25 |
| Keybuk | that might work | 01:25 |
| _ion | Looks quite intuitive. | 01:25 |
| Keybuk | need to sort out the job status messages first though | 01:30 |
| === Keybuk made things a wee bit more complicated :p | ||
| Keybuk | for a given job, "foo", there may be: | 02:17 |
| Keybuk | - old versions running from before the config file was modified | 02:18 |
| Keybuk | - a master instance that never runs | 02:18 |
| Keybuk | - multiple running instances | 02:18 |
| Keybuk | - or a single instance of the job | 02:18 |
| Keybuk | and for each instance, there may be: | 02:18 |
| Keybuk | - a "main stream" process (pre-start, main, post-start) | 02:18 |
| Keybuk | - a "side stream" process (post-start, pre-stop) | 02:18 |
| Keybuk | - any number of user actions | 02:18 |
| Keybuk | start foo => obviously only cares about the master/single instance of current versions | 02:21 |
| Keybuk | stop foo => only needs to care about single or multiple instances, but of both current and old versions | 02:22 |
| Keybuk | status foo => probably cares about them all? | 02:22 |
| Keybuk | this comes back to how instances are implemented | 02:25 |
| Keybuk | right now they're just extra entries in the hash table | 02:25 |
| Keybuk | perhaps separating all the non-config state into a JobInstance structure, and having a list of those in the job, is one way to do it | 02:25 |
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| Keybuk | *giggles* | 05:07 |
| === Keybuk finds silly bugs | ||
| Keybuk | a deleted job can't stop | 05:07 |
| Keybuk | because the job_change_goal() function won't let you run it for a deleted job | 05:07 |
| AlexExtreme | heh | 05:07 |
| === Keybuk wonders if anyone will ever reach 4 billion jobs or events on a running system | ||
| === AlexExtreme highly doubts that | ||
| mdales | AlexExtreme: we'll quote you on that in 5 years when 32 bit pids are a cause of global concern | 05:59 |
| AlexExtreme | :D | 05:59 |
| wasabi_ | They are a cause for concern right now in my world. | 05:59 |
| wasabi_ | Heh. | 05:59 |
| Keybuk | it doesn't matter, I've deliberately put in code to cope with it just in case | 05:59 |
| Keybuk | that branch is sub-optimal though | 06:00 |
| Keybuk | since once the counter wraps, it has to scan the entire jobs hash each time you want to add a new one to ensure uniqueness | 06:00 |
| Keybuk | (there's probably a clever way to avoid that) | 06:00 |
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| wasabi_ | oh, pids. n/m. | 06:03 |
| wasabi_ | for whatever reason my mind thought uid | 06:03 |
| Keybuk | not pids | 06:09 |
| Keybuk | the Job and EventEmission structures have a unique id field | 06:09 |
| Keybuk | so you know *which* "foo" job, and which "block-device-added" event it is | 06:09 |
| wasabi_ | uh huh | 06:09 |
| Keybuk | they're uint32_t, which wraps after 4 billion job file changes, or 4 billion initctl emits | 06:09 |
| Keybuk | (or 4 billion job state changes) | 06:09 |
| Keybuk | obviously once wrapped, job->id = job_id++ is no longer guaranteed to be unique | 06:10 |
| wasabi_ | so you need to scan before allocating. | 06:15 |
| Keybuk | right | 06:15 |
| Keybuk | but only once we've wrapped once | 06:15 |
| wasabi_ | store a "lowest known job id value". update it when you lease/release a number. when leasing one, use the "last known one ++" and check if it's < the lowest known. if not, do teh forward scan. | 06:15 |
| Keybuk | the "update when release" is the tricky bit :p | 06:15 |
| wasabi_ | well you only have to update on release when release == current lowest known | 06:16 |
| wasabi_ | none of which really matters anyways. | 06:17 |
| wasabi_ | the jobs hash is going to be small enough for it to not matter. | 06:17 |
| Keybuk | indeed | 06:21 |
| Keybuk | and job creation isn't a time-critical activity | 06:21 |
| Keybuk | in fact, upstart has no time critical activities :p | 06:22 |
| wasabi_ | only at boot. and that won't have looped anyways | 06:22 |
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