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| author | luoqi <luoqi@FreeBSD.org> | 1999-12-06 04:53:08 +0000 |
|---|---|---|
| committer | luoqi <luoqi@FreeBSD.org> | 1999-12-06 04:53:08 +0000 |
| commit | 5c9244cd12f812687a0e1da3fa8fd69c320bdb42 (patch) | |
| tree | 3d2bdc635a51af92e9000f2fe294d685906d5387 /sys/vm/vm_glue.c | |
| parent | 5851b69ff706eaa8e3a487bdfbbf3fe0177ed46a (diff) | |
| download | FreeBSD-src-5c9244cd12f812687a0e1da3fa8fd69c320bdb42.zip FreeBSD-src-5c9244cd12f812687a0e1da3fa8fd69c320bdb42.tar.gz | |
User ldt sharing.
Diffstat (limited to 'sys/vm/vm_glue.c')
| -rw-r--r-- | sys/vm/vm_glue.c | 17 |
1 files changed, 16 insertions, 1 deletions
diff --git a/sys/vm/vm_glue.c b/sys/vm/vm_glue.c index 5ec101f..7aa092d 100644 --- a/sys/vm/vm_glue.c +++ b/sys/vm/vm_glue.c @@ -209,6 +209,21 @@ vm_fork(p1, p2, flags) { register struct user *up; + if ((flags & RFPROC) == 0) { + /* + * Divorce the memory, if it is shared, essentially + * this changes shared memory amongst threads, into + * COW locally. + */ + if ((flags & RFMEM) == 0) { + if (p1->p_vmspace->vm_refcnt > 1) { + vmspace_unshare(p1); + } + } + cpu_fork(p1, p2, flags); + return; + } + if (flags & RFMEM) { p2->p_vmspace = p1->p_vmspace; p1->p_vmspace->vm_refcnt++; @@ -259,7 +274,7 @@ vm_fork(p1, p2, flags) * cpu_fork will copy and update the pcb, set up the kernel stack, * and make the child ready to run. */ - cpu_fork(p1, p2); + cpu_fork(p1, p2, flags); } /* |
