02-20-2009
Many thanks for your reply
Quote:
I'm wondering though, what priority is it being reduced from? Did it have ludicriously high priority in the first place, to halt your system like that? What user was your GUI running it as?
The main app's priority is -2 with a ROUND_RR scheduling policy,and it must be run by root user,or it won't work (i cant change this).If i remember well,it's the highest priority i can see using the "top" command,so this explains why my system halted (does it?).
Quote:
Lastly, I must wonder precisely by which mechanism this recordmydesktop process was ever started if not fork/exec
Before,i started it calling the "system" function,but after some readings i found out that it's not a suggested way to run external programs,for some problems related to the shell it's based on,so i passed to fork/exec.
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LEARN ABOUT OPENSOLARIS
nice
nice(3UCB) SunOS/BSD Compatibility Library Functions nice(3UCB)
NAME
nice - change priority of a process
SYNOPSIS
/usr/ucb/cc [ flag ... ] file ...
#include<unistd.h>
int nice(incr)
int incr;
DESCRIPTION
The scheduling priority of the process is augmented by incr. Positive priorities get less service than normal. Priority 10 is recommended
to users who wish to execute long-running programs without undue impact on system performance.
Negative increments are illegal, except when specified by the privileged user. The priority is limited to the range -20 (most urgent) to 20
(least). Requests for values above or below these limits result in the scheduling priority being set to the corresponding limit.
The priority of a process is passed to a child process by fork(2). For a privileged process to return to normal priority from an unknown
state, nice() should be called successively with arguments -40 (goes to priority -20 because of truncation), 20 (to get to 0), then 0 (to
maintain compatibility with previous versions of this call).
RETURN VALUES
Upon successful completion, nice() returns 0. Otherwise, a value of -1 is returned and errno is set to indicate the error.
ERRORS
The priority is not changed if:
EPERM The value of incr specified was negative, and the effective user ID is not the privileged user.
SEE ALSO
cc(1B), nice(1), renice(1), fork(2), priocntl(2), getpriority(3C)
NOTES
Use of these interfaces should be restricted to only applications written on BSD platforms. Use of these interfaces with any of the system
libraries or in multi-threaded applications is unsupported.
SunOS 5.11 30 Oct 2007 nice(3UCB)