Kent Borg wrote:
On Tue, Apr 25, 2006 at 07:52:48PM +0200, Philippe Gerum wrote:
No problem using it, but it will trigger an automatic switch to
secondary mode in order to issue the right Linux syscalls. The thread
will switch back to primary automatically again as soon as a (usually
blocking) Xenomai syscall is issued.
And, looking at strace output, it appears that is a syslog() is too
low a priority to be logged it doesn't make a system call and so will
not drop us out of realtime.
Do not trust strace there, it heavily relies on other glibc services,
like buffered I/O, which might issue syscalls under various conditions.
For instance, internal mutex locking might cause a syscall to deal with
any contended request, or malloc called indirectly might ask for
extending the caller's data segment, and so on. Additionally, some
syslog flags, like LOG_CONS, do cause file I/O.
--
Philippe.
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