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Cygwin: FIFO: lock fixes

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Add some missing locks and remove one extra unlock.  Clarify for some
functions whether caller or callee acquires lock, and add appropriate
comments.
This commit is contained in:
Ken Brown 2020-07-31 13:55:17 -04:00
parent cb7fba2f3e
commit e319fd0e62
1 changed files with 17 additions and 6 deletions
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23
winsup/cygwin/fhandler_fifo.cc
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@ -316,6 +316,7 @@ fhandler_fifo::wait_open_pipe (HANDLE& ph)
return status;
}
/* Always called with fifo_client_lock in place. */
int
fhandler_fifo::add_client_handler (bool new_pipe_instance)
{
@ -345,6 +346,7 @@ fhandler_fifo::add_client_handler (bool new_pipe_instance)
return 0;
}
/* Always called with fifo_client_lock in place. */
void
fhandler_fifo::delete_client_handler (int i)
{
@ -354,7 +356,8 @@ fhandler_fifo::delete_client_handler (int i)
(nhandlers - i) * sizeof (fc_handler[i]));
}
/* Delete handlers that we will never read from. */
/* Delete handlers that we will never read from. Always called with
fifo_client_lock in place. */
void
fhandler_fifo::cleanup_handlers ()
{
@ -369,6 +372,7 @@ fhandler_fifo::cleanup_handlers ()
}
}
/* Always called with fifo_client_lock in place. */
void
fhandler_fifo::record_connection (fifo_client_handler& fc,
fifo_client_connect_state s)
@ -398,6 +402,7 @@ fhandler_fifo::update_my_handlers ()
if (!prev_proc)
api_fatal ("Can't open process of previous owner, %E");
fifo_client_lock ();
for (int i = 0; i < get_shared_nhandlers (); i++)
{
if (add_client_handler (false) < 0)
@ -419,10 +424,12 @@ fhandler_fifo::update_my_handlers ()
fc.last_read = shared_fc_handler[i].last_read;
}
}
fifo_client_unlock ();
set_prev_owner (null_fr_id);
return ret;
}
/* Always called with fifo_client_lock and owner_lock in place. */
int
fhandler_fifo::update_shared_handlers ()
{
@ -435,9 +442,7 @@ fhandler_fifo::update_shared_handlers ()
set_shared_nhandlers (nhandlers);
memcpy (shared_fc_handler, fc_handler, nhandlers * sizeof (fc_handler[0]));
shared_fc_handler_updated (true);
owner_lock ();
set_prev_owner (me);
owner_unlock ();
return 0;
}
@ -509,7 +514,6 @@ fhandler_fifo::fifo_reader_thread_func ()
if (update_my_handlers () < 0)
debug_printf ("error updating my handlers, %E");
owner_found ();
owner_unlock ();
/* Fall through to owner_listen. */
}
}
@ -602,8 +606,13 @@ owner_listen:
}
if (ph)
NtClose (ph);
if (update && update_shared_handlers () < 0)
api_fatal ("Can't update shared handlers, %E");
if (update)
{
owner_lock ();
if (get_owner () == me && update_shared_handlers () < 0)
api_fatal ("Can't update shared handlers, %E");
owner_unlock ();
}
fifo_client_unlock ();
if (cancel)
goto canceled;
@ -1402,9 +1411,11 @@ fhandler_fifo::fstatvfs (struct statvfs *sfs)
void
fhandler_fifo::close_all_handlers ()
{
fifo_client_lock ();
for (int i = 0; i < nhandlers; i++)
fc_handler[i].close ();
nhandlers = 0;
fifo_client_unlock ();
}
fifo_client_connect_state