add os.ForkExec, os.Exec, os.Wait, exec.OpenCmd.
as thread-safe as possible, given the surrounding system.
add stub RWLock implementation.
R=r
DELTA=852 (834 added, 6 deleted, 12 changed)
OCL=25046
CL=25053
diff --git a/src/lib/net/fd.go b/src/lib/net/fd.go
index 1ec0d8a..0c7770c 100644
--- a/src/lib/net/fd.go
+++ b/src/lib/net/fd.go
@@ -280,17 +280,26 @@
return nil, os.EINVAL
}
+ // See ../syscall/exec.go for description of ForkLock.
+ // It is okay to hold the lock across syscall.Accept
+ // because we have put fd.fd into non-blocking mode.
+ syscall.ForkLock.RLock();
var s, e int64;
for {
s, e = syscall.Accept(fd.fd, sa);
if e != syscall.EAGAIN {
break;
}
+ syscall.ForkLock.RUnlock();
pollserver.WaitRead(fd);
+ syscall.ForkLock.RLock();
}
if e != 0 {
+ syscall.ForkLock.RUnlock();
return nil, os.ErrnoToError(e)
}
+ syscall.CloseOnExec(s);
+ syscall.ForkLock.RUnlock();
raddr, err1 := sockaddrToHostPort(sa);
if err1 != nil {
