o5r/plan9port
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

remove race between openfdthread and connoutthread msgput,

Browse source 
so that openfd'ed fids always get clunked properly.
This commit is contained in:
rsc 2004-12-28 22:11:34 +00:00
parent b37396bd11
commit 21e626deb3
1 changed files with 8 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

9
src/cmd/9pserve.c
View file

@ -29,6 +29,7 @@ struct Fid
int fid;
int ref;
int cfid;
int openfd;
Fid *next;
};
@ -550,6 +551,7 @@ openfdthread(void *v)
m = nil;
}
}
/* CLUNK NOT HAPPENING */
if(verbose) fprint(2, "eof on %d fid %d\n", c->fd, fid->fid);
close(c->fd);
closeioproc(io);
@ -557,7 +559,8 @@ openfdthread(void *v)
msgput(m);
msgput(m);
}
if(fid->ref == 1){
if(verbose) fprint(2, "eof on %d fid %d ref %d\n", c->fd, fid->fid, fid->ref);
if(--fid->openfd == 0){
m = msgnew();
m->internal = 1;
m->c = c;
@ -589,6 +592,7 @@ xopenfd(Msg *m)
if(pipe(p) < 0){
rerrstr(errs, sizeof errs);
err(m, errs);
/* XXX return here? */
}
if(verbose) fprint(2, "xopen pipe %d %d...", p[0], p[1]);
@ -601,6 +605,7 @@ xopenfd(Msg *m)
/* a ref for us */
nc->fdfid = m->fid;
m->fid->ref++;
nc->fdfid->openfd++;
nc->fdmode = m->tx.mode;
nc->fd = p[0];
@ -613,6 +618,7 @@ xopenfd(Msg *m)
nc->internal = chancreate(sizeof(void*), 0);
nc->fdfid = m->fid;
m->fid->ref++;
nc->fdfid->openfd++;
nc->fdmode = OREAD;
nc->fd = dup(p[0], -1);
threadcreate(openfdthread, nc, STACK);
@ -841,6 +847,7 @@ fidput(Fid *f)
assert(f->ref > 0);
if(--f->ref > 0)
return;
fprint(2, "free %d from %lux\n", f->fid, getcallerpc(&f));
f->next = freefid;
f->cfid = -1;
freefid = f;