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- cleanup

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- fix non UTF-8 in comments
- fixed unix priority scaling


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@29946 a95241bf-73f2-0310-859d-f6bbb57e9c96
This commit is contained in:
François Revol 2009-04-05 18:18:27 +00:00
parent dd6ab6242c
commit 1a7cbee5c2
1 changed files with 25 additions and 22 deletions
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47
src/bin/renice.c
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@ -1,5 +1,5 @@
/* renice.c - unixish renice command for BeOs
* (c) 2001, 2002, François Revol (mmu_man) for OpenBeOS
* (c) 2001, 2002, François Revol (mmu_man) for OpenBeOS
* released under the MIT licence.
*
* How did I live without it before ??? ;)
@ -8,7 +8,7 @@
* Cleanup for inclusion in OpenBeOS,
* Used the code to rewrite the 'prio' BeOS command for OpenBeOS.
* 04-14-2002 v1.1
* Added -f upon suggestion from Idéfix on BeShare
* Added -f upon suggestion from Idéfix on BeShare
* 2001 v1.0
* Initial.
*/
@ -24,41 +24,43 @@ From man renice:
/usr/sbin/renice [-n increment] [-p] [-g | -u] ID ... /usr/sbin/renice priority [-p] pid ... [-g pgrp ...] [-u user ...]
#define B_LOW_PRIORITY 5
#define B_NORMAL_PRIORITY 10
#define B_DISPLAY_PRIORITY 15
#define B_URGENT_DISPLAY_PRIORITY 20
#define B_REAL_TIME_DISPLAY_PRIORITY 100
#define B_URGENT_PRIORITY 110
#define B_REAL_TIME_PRIORITY 120
BeOs priorities:
High Prio (realtime) Default Low Prio
120 10 1 (0 only for idle_thread)
(realtime) High Prio Default Low Prio
120 99 10 1 (0 only for idle_thread)
UNIX Priorities:
-20 0 20
Note that however this isn't perfect, since priorities
beyond 100 in BeOS move the thread into the real-time class.
Linux for example, has a separate API for doing this,
and even a process set to -20 can be in the normal scheduling class.
UNIX nice:
-20 0 19
UNIX priorities:
0 20 39
renice can be given more than one pid on the command line.
prio is locked into one pid, then the priority.
*/
#ifndef NZERO
#define NZERO 20
#endif
#define BZERO B_NORMAL_PRIORITY
#define BMIN (B_REAL_TIME_DISPLAY_PRIORITY-1)
//#define BMAX B_NORMAL_PRIORITY
#define BMAX 1
// returns an equivalent UNIX priority for a given BeOS priority.
static int32 prio_be_to_unix(int32 prio)
{
return (prio > 10)?(- (20 * (prio - 10)) / 110):(2 * (10 - prio));
if (prio > BZERO)
return NZERO - ((prio - BZERO) * NZERO) / (BMIN - BZERO);
return NZERO + ((BZERO - prio) * (NZERO - 1)) / (BZERO - BMAX);
}
// returns an equivalent BeOS priority for a given UNIX priority.
static int32 prio_unix_to_be(int32 prio)
{
return (prio > 0)?(10 - (prio/2)):(10 + 110 * (-prio) / 20);
if (prio > NZERO)
return BZERO - ((prio - NZERO) * (BZERO - BMAX)) / (NZERO-1);
return BZERO + ((NZERO - prio) * (BMIN - BZERO)) / (NZERO);
}
static status_t renice_thread(int32 prio, int32 increment, bool use_be_prio, thread_id th)
@ -94,7 +96,7 @@ int main(int argc, char **argv)
int err = 1;
char *thname;
prio = 9; // default UNIX priority for nice
prio = NZERO; // default UNIX priority for nice
// convert it to beos
if (!use_be_prio)
prio = prio_unix_to_be(prio);
@ -130,6 +132,7 @@ int main(int argc, char **argv)
th = thinfo.thread;
renice_thread(prio, increment, use_be_prio, th);
err = 0;
/* find another one */
}
}
}