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| author | Ed Schouten <ed@FreeBSD.org> | 2015-10-22 09:33:34 +0000 |
|---|---|---|
| committer | Ed Schouten <ed@FreeBSD.org> | 2015-10-22 09:33:34 +0000 |
| commit | aff5735784df44945af1de1cf35b5df0779bb097 (patch) | |
| tree | 8d088ef4526d83dbcb1235ccc1a30a87606ea4b2 /sys/kern/subr_syscall.c | |
| parent | b78ef4bd86f5fbc328996350735aa6586cd1bc35 (diff) | |
| download | src-aff5735784df44945af1de1cf35b5df0779bb097.tar.gz src-aff5735784df44945af1de1cf35b5df0779bb097.zip | |
Add a way to distinguish between forking and thread creation in schedtail.
For CloudABI we need to initialize the registers of new threads
differently based on whether the thread got created through a fork or
through simple thread creation.
Add a flag, TDP_FORKING, that is set by do_fork() and cleared by
fork_exit(). This can be tested against in schedtail.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D3973
Notes
Notes:
svn path=/head/; revision=289748
Diffstat (limited to 'sys/kern/subr_syscall.c')
| -rw-r--r-- | sys/kern/subr_syscall.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/sys/kern/subr_syscall.c b/sys/kern/subr_syscall.c index 71f3d5998367..c0763262f74b 100644 --- a/sys/kern/subr_syscall.c +++ b/sys/kern/subr_syscall.c @@ -176,6 +176,9 @@ syscallret(struct thread *td, int error, struct syscall_args *sa) struct proc *p, *p2; int traced; + KASSERT((td->td_pflags & TDP_FORKING) == 0, + ("fork() did not clear TDP_FORKING upon completion")); + p = td->td_proc; /* |