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Cygwin: FIFO: reorganize some fifo_client_handler methods 

Rename the existing set_state() to query_and_set_state() to reflect
what it really does.  (It queries the O/S for the pipe state.)  Add a
new set_state() method, which is a standard setter, and a
corresponding getter get_state().
This commit is contained in:
Ken Brown 2020-08-03 09:32:30 -04:00
parent 6ed067a0ae
commit 289af73a89
3 changed files with 50 additions and 37 deletions
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9
winsup/cygwin/fhandler.h
View File

@ -1297,11 +1297,14 @@ enum fifo_client_connect_state
struct fifo_client_handler
{
HANDLE h;
fifo_client_connect_state state;
fifo_client_connect_state _state;
bool last_read; /* true if our last successful read was from this client. */
fifo_client_handler () : h (NULL), state (fc_unknown), last_read (false) {}
fifo_client_handler () : h (NULL), _state (fc_unknown), last_read (false) {}
void close () { NtClose (h); }
fifo_client_connect_state set_state ();
fifo_client_connect_state get_state () const { return _state; }
void set_state (fifo_client_connect_state s) { _state = s; }
/* Query O/S. Return previous state. */
fifo_client_connect_state query_and_set_state ();
};
class fhandler_fifo;

50
winsup/cygwin/fhandler_fifo.cc
View File

@ -340,7 +340,7 @@ fhandler_fifo::add_client_handler (bool new_pipe_instance)
if (!ph)
return -1;
fc.h = ph;
fc.state = fc_listening;
fc.set_state (fc_listening);
}
fc_handler[nhandlers++] = fc;
return 0;
@ -365,7 +365,7 @@ fhandler_fifo::cleanup_handlers ()
while (i < nhandlers)
{
if (fc_handler[i].state < fc_closing)
if (fc_handler[i].get_state () < fc_closing)
delete_client_handler (i);
else
i++;
@ -377,7 +377,7 @@ void
fhandler_fifo::record_connection (fifo_client_handler& fc,
fifo_client_connect_state s)
{
fc.state = s;
fc.set_state (s);
set_pipe_non_blocking (fc.h, true);
}
@ -414,13 +414,13 @@ fhandler_fifo::update_my_handlers ()
{
debug_printf ("Can't duplicate handle of previous owner, %E");
__seterrno ();
fc.state = fc_error;
fc.set_state (fc_error);
fc.last_read = false;
ret = -1;
}
else
{
fc.state = shared_fc_handler[i].state;
fc.set_state (shared_fc_handler[i].get_state ());
fc.last_read = shared_fc_handler[i].last_read;
}
}
@ -614,7 +614,7 @@ owner_listen:
break;
default:
debug_printf ("NtFsControlFile status %y after failing to connect bogus client or real client", io.Status);
fc.state = fc_unknown;
fc.set_state (fc_unknown);
break;
}
break;
@ -1280,7 +1280,7 @@ fhandler_fifo::raw_read (void *in_ptr, size_t& len)
for (j = 0; j < nhandlers; j++)
if (fc_handler[j].last_read)
break;
if (j < nhandlers && fc_handler[j].state >= fc_closing)
if (j < nhandlers && fc_handler[j].get_state () >= fc_closing)
{
NTSTATUS status;
IO_STATUS_BLOCK io;
@ -1303,11 +1303,11 @@ fhandler_fifo::raw_read (void *in_ptr, size_t& len)
case STATUS_PIPE_EMPTY:
break;
case STATUS_PIPE_BROKEN:
fc_handler[j].state = fc_disconnected;
fc_handler[j].set_state (fc_disconnected);
break;
default:
debug_printf ("NtReadFile status %y", status);
fc_handler[j].state = fc_error;
fc_handler[j].set_state (fc_error);
break;
}
fc_handler[j].last_read = false;
@ -1315,7 +1315,7 @@ fhandler_fifo::raw_read (void *in_ptr, size_t& len)
/* Second pass. */
for (int i = 0; i < nhandlers; i++)
if (fc_handler[i].state >= fc_closing)
if (fc_handler[i].get_state () >= fc_closing)
{
NTSTATUS status;
IO_STATUS_BLOCK io;
@ -1339,12 +1339,12 @@ fhandler_fifo::raw_read (void *in_ptr, size_t& len)
case STATUS_PIPE_EMPTY:
break;
case STATUS_PIPE_BROKEN:
fc_handler[i].state = fc_disconnected;
fc_handler[i].set_state (fc_disconnected);
nconnected--;
break;
default:
debug_printf ("NtReadFile status %y", status);
fc_handler[i].state = fc_error;
fc_handler[i].set_state (fc_error);
nconnected--;
break;
}
@ -1417,45 +1417,51 @@ fhandler_fifo::close_all_handlers ()
fifo_client_unlock ();
}
/* Return previous state. */
fifo_client_connect_state
fifo_client_handler::set_state ()
fifo_client_handler::query_and_set_state ()
{
IO_STATUS_BLOCK io;
FILE_PIPE_LOCAL_INFORMATION fpli;
NTSTATUS status;
fifo_client_connect_state prev_state = get_state ();
if (!h)
return (state = fc_unknown);
{
set_state (fc_unknown);
goto out;
}
status = NtQueryInformationFile (h, &io, &fpli,
sizeof (fpli), FilePipeLocalInformation);
if (!NT_SUCCESS (status))
{
debug_printf ("NtQueryInformationFile status %y", status);
state = fc_error;
set_state (fc_error);
}
else if (fpli.ReadDataAvailable > 0)
state = fc_input_avail;
set_state (fc_input_avail);
else
switch (fpli.NamedPipeState)
{
case FILE_PIPE_DISCONNECTED_STATE:
state = fc_disconnected;
set_state (fc_disconnected);
break;
case FILE_PIPE_LISTENING_STATE:
state = fc_listening;
set_state (fc_listening);
break;
case FILE_PIPE_CONNECTED_STATE:
state = fc_connected;
set_state (fc_connected);
break;
case FILE_PIPE_CLOSING_STATE:
state = fc_closing;
set_state (fc_closing);
break;
default:
state = fc_error;
set_state (fc_error);
break;
}
return state;
out:
return prev_state;
}
void

28
winsup/cygwin/select.cc
View File

@ -875,18 +875,22 @@ peek_fifo (select_record *s, bool from_select)
fh->fifo_client_lock ();
int nconnected = 0;
for (int i = 0; i < fh->get_nhandlers (); i++)
if (fh->get_fc_handler (i).set_state () >= fc_closing)
{
nconnected++;
if (fh->get_fc_handler (i).state == fc_input_avail)
{
select_printf ("read: %s, ready for read", fh->get_name ());
fh->fifo_client_unlock ();
fh->reading_unlock ();
gotone += s->read_ready = true;
goto out;
}
}
{
fifo_client_handler &fc = fh->get_fc_handler (i);
fc.query_and_set_state ();
if (fc.get_state () >= fc_closing)
{
nconnected++;
if (fc.get_state () == fc_input_avail)
{
select_printf ("read: %s, ready for read", fh->get_name ());
fh->fifo_client_unlock ();
fh->reading_unlock ();
gotone += s->read_ready = true;
goto out;
}
}
}
fh->fifo_client_unlock ();
if (!nconnected && fh->hit_eof ())
{