Date: Tue, 28 Oct 2003 12:46:23 -0800 (PST) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/sys resourcevar.h Message-ID: <200310282046.h9SKkNcQ029699@repoman.freebsd.org>
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jhb 2003/10/28 12:46:23 PST
FreeBSD src repository
Modified files:
sys/sys resourcevar.h
Log:
According to the submitter, POSIX mandates that all interval timers are
reset in a child process after a fork(). Currently, however, only the
real timer is cleared while the virtual and profiling timers are inherited.
The realtimer is cleared because it lives directly in struct proc in
p_realtimer. It is in the zero'd section of struct proc. The other timers
live in the p_timer[] array in struct pstats. These timers are copied on
fork() rather than zero'd. The fix is to move p_timer[] to the zero'd
part of struct pstats so that they are zero'd instead of copied on fork().
Note: Since at least FreeBSD 2.0 (and possibly earlier) we've had storage
for two real interval timers. Now that the uarea is less important,
perhaps we could move all of p_timer[] over to struct proc and drop the
p_realtimer special case to fix that.
PR: kern/58647
Reported by: Dan Nelson <dnelson@allantgroup.com>
MFC after: 1 week
Revision Changes Path
1.36 +2 -3 src/sys/sys/resourcevar.h
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