static Thread*
runthread(Proc *p)
{
Thread *t;
Tqueue *q;
if(p->nthreads==0)
return nil;
q = &p->ready;
lock(&p->readylock);
if(q->head == nil){
q->asleep = 1;
_threaddebug(DBGSCHED, "sleeping for more work");
unlock(&p->readylock);
while(rendezvous(q, 0) == (void*)~0){
if(_threadexitsallstatus)
exits(_threadexitsallstatus);
}
/* lock picked up from _threadready */
}
t = q->head;
q->head = t->next;
unlock(&p->readylock);
return t;
}
void
_threadready(Thread *t)
{
Tqueue *q;
assert(t->state == Ready);
_threaddebug(DBGSCHED, "readying %d.%d", t->proc->pid, t->id);
q = &t->proc->ready;
lock(&t->proc->readylock);
t->next = nil;
if(q->head==nil)
q->head = t;
else
*q->tail = t;
q->tail = &t->next;
if(q->asleep){
q->asleep = 0;
/* lock passes to runthread */
_threaddebug(DBGSCHED, "waking process %d", t->proc->pid);
while(rendezvous(q, 0) == (void*)~0){
if(_threadexitsallstatus)
exits(_threadexitsallstatus);
}
}else
unlock(&t->proc->readylock);
}
void
sayhi(void *v)
{
USED(v);
print("hello from subproc\n");
print("rendez got %lu from main\n", rendezvous(0x1234, 1234));
exits(0);
}
int
main(int argc, char **argv)
{
print("hello from main\n");
ffork(RFMEM|RFPROC, sayhi, nil);
print("rendez got %lu from subproc\n", rendezvous(0x1234, 0));
exits(0);
}
int main(int argc, char *argv[])
{
int C;
scanf("%d", &C);
while (C--)
rendezvous();
return 0;
}
static void
postproc(void *v)
{
Srv *s;
s = v;
if(!s->leavefdsopen){
rfork(RFNOTEG);
rendezvous(0, 0);
close(s->srvfd);
}
srv(s);
}
static void
sysrendezvous(void)
{
u32int tag, value;
tag = arg(0);
value = arg(1);
if(systrace)
fprint(2, "rendezvous(%#ux, %#ux)\n", tag, value);
P->R[0] = (u32int) (uintptr)rendezvous((void *) tag, (void *) value);
if(P->R[0] == ~0)
noteerr(0, 1);
}
void
_postmountsrv(Srv *s, char *name, char *mtpt, int flag)
{
int fd[2];
if(!s->nopipe){
if(pipe(fd) < 0)
sysfatal("pipe: %r");
s->infd = s->outfd = fd[1];
s->srvfd = fd[0];
}
if(name)
if(postfd(name, s->srvfd) < 0)
sysfatal("postfd %s: %r", name);
if(_forker == nil)
sysfatal("no forker");
_forker(postproc, s, RFNAMEG);
/*
* Normally the server is posting as the last thing it does
* before exiting, so the correct thing to do is drop into
* a different fd space and close the 9P server half of the
* pipe before trying to mount the kernel half. This way,
* if the file server dies, we don't have a ref to the 9P server
* half of the pipe. Then killing the other procs will drop
* all the refs on the 9P server half, and the mount will fail.
* Otherwise the mount hangs forever.
*
* Libthread in general and acme win in particular make
* it hard to make this fd bookkeeping work out properly,
* so leaveinfdopen is a flag that win sets to opt out of this
* safety net.
*/
if(!s->leavefdsopen){
rfork(RFFDG);
rendezvous(0, 0);
close(s->infd);
if(s->infd != s->outfd)
close(s->outfd);
}
if(mtpt){
if(amount(s->srvfd, mtpt, flag, "") == -1)
sysfatal("mount %s: %r", mtpt);
}else
close(s->srvfd);
}
/*
* replace the fd with a pipe and start a process to
* accept calls in. this is all to make select work.
*/
static int
listenproc(Rock *r, int fd)
{
Rock *nr;
char *net;
int cfd, nfd, dfd;
int pfd[2];
struct stat d;
char *p;
char listen[Ctlsize];
char name[Ctlsize];
switch(r->stype){
case SOCK_DGRAM:
net = "udp";
break;
case SOCK_STREAM:
net = "tcp";
break;
default:
net = "gok";
break;
}
strcpy(listen, r->ctl);
p = strrchr(listen, '/');
if(p == 0)
return -1;
strcpy(p+1, "listen");
if(pipe(pfd) < 0)
return -1;
/* replace fd with a pipe */
nfd = dup(fd);
dup2(pfd[0], fd);
close(pfd[0]);
fstat(fd, &d);
r->inode = d.st_ino;
r->dev = d.st_dev;
/* start listening process */
switch(fork()){
case -1:
close(pfd[1]);
close(nfd);
return -1;
case 0:
if(_muxsid == -1) {
rfork(RFNOTEG);
_muxsid = getpgrp();
} else
setpgid(getpid(), _muxsid);
rendezvous(2, _muxsid);
break;
default:
atexit(_killmuxsid);
_muxsid = rendezvous(2, 0);
close(pfd[1]);
close(nfd);
return 0;
}
/* for(fd = 0; fd < 30; fd++)
if(fd != nfd && fd != pfd[1])
close(fd); */
for(;;){
cfd = open(listen, O_RDWR);
if(cfd < 0)
break;
dfd = _sock_data(cfd, net, r->domain, r->stype, r->protocol, &nr);
if(dfd < 0)
break;
if(write(pfd[1], nr->ctl, strlen(nr->ctl)) < 0)
break;
if(read(pfd[1], name, sizeof(name)) <= 0)
break;
close(dfd);
}
exit(0);
return 0;
}
void
startcmd(Conn *c, char *cmd, int *kidpid, int *kidin)
{
int i, pid, kpid;
int pfd[3][2];
char *dir;
char *sysname, *tz;
Msg *m;
Waitmsg *w;
for(i=0; i<3; i++)
if(pipe(pfd[i]) < 0)
sysfatal("pipe: %r");
sysname = getenv("sysname");
tz = getenv("timezone");
switch(pid = rfork(RFPROC|RFMEM|RFNOWAIT)){
case -1:
sysfatal("fork: %r");
case 0:
switch(kpid = rfork(RFPROC|RFNOTEG|RFENVG|RFFDG)){
case -1:
sysfatal("fork: %r");
case 0:
for(i=0; i<3; i++){
if(dup(pfd[i][1], i) < 0)
sysfatal("dup: %r");
close(pfd[i][0]);
close(pfd[i][1]);
}
putenv("user", c->user);
if(sysname)
putenv("sysname", sysname);
if(tz)
putenv("tz", tz);
dir = smprint("/usr/%s", c->user);
if(dir == nil || chdir(dir) < 0)
chdir("/");
if(cmd){
putenv("service", "rx");
execl("/bin/rc", "rc", "-lc", cmd, nil);
sysfatal("cannot exec /bin/rc: %r");
}else{
putenv("service", "con");
execl("/bin/ip/telnetd", "telnetd", "-tn", nil);
sysfatal("cannot exec /bin/ip/telnetd: %r");
}
default:
*kidpid = kpid;
rendezvous(kidpid, 0);
for(;;){
if((w = wait()) == nil)
sysfatal("wait: %r");
if(w->pid == kpid)
break;
free(w);
}
if(w->msg[0]){
m = allocmsg(c, SSH_MSG_DISCONNECT, 4+strlen(w->msg));
putstring(m, w->msg);
sendmsg(m);
}else{
m = allocmsg(c, SSH_SMSG_EXITSTATUS, 4);
putlong(m, 0);
sendmsg(m);
}
for(i=0; i<3; i++)
close(pfd[i][0]);
free(w);
exits(nil);
break;
}
default:
atexitkill(pid);
rendezvous(kidpid, 0);
break;
}
for(i=0; i<3; i++)
close(pfd[i][1]);
copyout(c, pfd[1][0], SSH_SMSG_STDOUT_DATA);
copyout(c, pfd[2][0], SSH_SMSG_STDERR_DATA);
*kidin = pfd[0][0];
}
void
main(int argc, char *argv[])
{
int fd, cfd, pid, ofd, i;
char file[128], *f;
char *dev, *devctl, *out;
long tot, nr;
int sz;
sz = 8;
dev = "/dev/ptrace";
out = nil;
ARGBEGIN{
case 'f':
dev = EARGF(usage());
break;
case 'o':
out = EARGF(usage());
break;
case 's':
sz = strtoul(EARGF(usage()), 0, 0);
break;
case 'p':
if(npids > nelem(pids))
sysfatal("too many pids");
pids[npids++] = strtoul(EARGF(usage()), 0, 0);
break;
default:
usage();
}ARGEND
if(argc == 0)
usage();
sz *= 1024;
if(sz < 1024)
sz = 1024;
if(sz > 64*1024) /* perhaps we shouldn't limit it */
sz = 64*1024;
devctl = smprint("%sctl", dev);
if(devctl == nil)
sysfatal("no memory");
if(access(argv[0], AEXIST) < 0){
seprint(file, file+sizeof file, "/bin/%s", argv[0]);
f = file;
}else
f = argv[0];
if(access(f, AEXIST) < 0)
sysfatal("%s: %r", argv[0]);
/* prepage; don't want interference while tracing */
for(i = 0; i < sizeof buf; i += 4096)
buf[i] = 0;
rfork(RFREND);
pid = 0;
/* play a dance with the traced command so it starts when we want,
* or issue the trace command for the traced pids.
*/
cfd = open(devctl, OWRITE);
if(cfd < 0)
sysfatal("can't trace: %r");
if(npids == 0){
pid = rfork(RFPROC|RFFDG);
switch(pid){
case -1:
sysfatal("fork: %r");
case 0:
/* wait until traced */
if(rendezvous(usage, 0) == 0)
exits("no trace");
rfork(RFREND);
exec(f, argv);
sysfatal("exec: %r");
}
if(fprint(cfd, "size %d\n", sz) < 0 || fprint(cfd, "trace %d 1\n", pid) < 0){
rendezvous(usage, 0);
sysfatal("can't trace");
}
if(out == nil){
rendezvous(usage, usage);
waitpid();
exits(nil);
}
}else{
for(i = 0; i < npids; i++)
if(fprint(cfd, "trace %d 1\n", pids[i]) < 0)
fprint(2, "%s: trace %d: %r\n", argv0, pids[i]);
}
close(cfd);
/* ready: open the trace and collect what we can. */
fd = open(dev, OREAD);
ofd = create(out, OWRITE, 0664);
if(fd < 0 || ofd < 0){
if(npids == 0)
rendezvous(usage, 0);
sysfatal("can't trace: %r");
}
done = 0;
switch(rfork(RFPROC|RFMEM)){
case -1:
sysfatal("fork");
default:
if(npids == 0){
/* let the traced go! */
rendezvous(usage, usage);
}
while(waitpid() != pid)
;
done = 1;
exits(nil);
case 0:
/* The damn device won't block us. We must insist upon eof.
* Besides, when done, we must give time for the events to
* arrive.
*/
for(;;){
for(tot = 0; tot < sizeof buf - 128; tot += nr){
nr = read(fd, buf+tot, sizeof buf - tot);
if(nr < 0)
sysfatal("read: %r");
if(nr == 0){
sleep(100);
if(done)
break;
}
}
if(tot > 0 && write(ofd, buf, tot) != tot)
sysfatal("write: %r");
/* try to read more if we were done; but just once. */
if(done && tot == 0 && done++ == 2)
break;
}
close(fd);
close(ofd);
rendezvous(main, nil);
exits(nil);
}
}
inline
std::tuple< hipStream_t, hipError_t > waitfor_all( hipStream_t st) {
detail::single_stream_rendezvous rendezvous( st);
return rendezvous.wait();
}
static void
threadWakeup(Thread *t)
{
if(rendezvous(t, (void*)0x44391f14) != (void*)0x22bbdfd6)
sysfatal("threadWakeup: rendezvous failed: %r");
}