bugThe GNU Hurd - Bugs: bug #18883, nice/getpriority/setpriority...


bug #18883: nice/getpriority/setpriority enforces even nice values

Submitted by:  Samuel Thibault <sthibaul>
Submitted on:  Thu 25 Jan 2007 11:22:19 PM UTC  
Category: glibcSeverity: 3 - Normal
Priority: 5 - NormalItem Group: Standard Compliance
Status: NonePrivacy: Public
Assigned to: NoneOriginator Name: 
Open/Closed: OpenReproducibility: Every Time
Size (loc): NonePlanned Release: None
Effort: 0.00
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Thu 25 Jan 2007 11:22:19 PM UTC, original submission:

Because of limitation of the Mach kernel, nice values are divided by two for getting a Mach priority (MACH_PRIORITY_TO_NICE), and mach priority is multiplied by two for getting a nice value (NICE_TO_MACH_PRIORITY).

That makes setpriority/getpriority/nice behave strangely: they enforce an even nice value, which makes the corutils package's testsuite fail.

The POSIX standard says ``The nice() function shall add the value of incr to the nice value of the calling process.'' and ``Upon successful completion, nice() shall return the new nice value - {NZERO}.''

Does glibc need corrected or the testsuite fixed to accept such a behavior? I'd say glibc should be corrected, keeping the nice value in a global variable.

Samuel Thibault <sthibaul>
Project Member


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