[haiku-bugs] Re: [Haiku] #2817: setpriority and getpriority are missing to compile ocaml out of the box under Haiku
- From: "Timothy_Gu" <trac@xxxxxxxxxxxx>
- Date: Thu, 15 Jan 2015 23:59:04 -0000
#2817: setpriority and getpriority are missing to compile ocaml out of the box
under Haiku
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Reporter: oco | Owner: nobody
Type: enhancement | Status: new
Priority: normal | Milestone: Unscheduled
Component: System/POSIX | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Comment (by Timothy_Gu):
Replying to [comment:15 pulkomandy]:
> There is a limitation with the approach you implemented in these
patches: the priority only applies to existing threads.
I assume you only mean `setpriority()` here, as `getpriority()` is kind of
irrelevant to the next comment.
> As discussed in this ticket, a better solution would be to have a
process-global "nice" value and also use it when creating new threads to
adjust their priorities.
(Assuming by "process" you mean "team")
This badly conflicts with the current kernel architecture:
1. What if you spawn a new thread and change the niceness of the new
thread to another level? Should the process niceness be changed? If so, to
what value?
2. Say you have a process with two threads, 0 with niceness 1 and 1 with
2. Also assume we have chosen the process niceness to be the maximum
numerical values of the niceness of all the threads, so 2 in this case.
What if I spawn a new thread from thread 0? Should the new thread have 2
or 1?
3. I assume the `team_info` ABI is locked.
A more viable approach is to fix `spawn_thread()` and `fork()` to use the
niceness of the spawning thread, which is out-of-scope for this patch
alone.
--
Ticket URL: <https://dev.haiku-os.org/ticket/2817#comment:16>
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