On 2018/2月/23 07:31, Derek Foreman wrote:
> On 2018-02-23 03:52 AM, w...@ongy.net wrote:
> > From: Markus Ongyerth <w...@ongy.net>
> > 
> > This is related to the discussion earlier on the mailing list and
> > demonstrates a problem with current wl_priv_signal_emit and wl_listener
> > that free themselves, but do not remove from the list.
> > 
> > This testcase asserts that the wl_list inside wl_listener is not written
> > to anymore after it got emitted.
> > ---
> >   Makefile.am                 |  3 +++
> >   tests/free-without-remove.c | 63 
> > +++++++++++++++++++++++++++++++++++++++++++++
> >   2 files changed, 66 insertions(+)
> >   create mode 100644 tests/free-without-remove.c
> > 
> > diff --git a/Makefile.am b/Makefile.am
> > index 322d6b8..c51f328 100644
> > --- a/Makefile.am
> > +++ b/Makefile.am
> > @@ -158,6 +158,7 @@ pkgconfig_DATA += egl/wayland-egl-backend.pc
> >   built_test_programs =                             \
> >     array-test                              \
> > +   free-without-remove-test                \
> >     client-test                             \
> >     display-test                            \
> >     connection-test                         \
> > @@ -223,6 +224,8 @@ libtest_runner_la_LIBADD =                      \
> >   array_test_SOURCES = tests/array-test.c
> >   array_test_LDADD = libtest-runner.la
> > +free_without_remove_test_SOURCES = tests/free-without-remove.c
> > +free_without_remove_test_LDADD = libtest-runner.la
> >   client_test_SOURCES = tests/client-test.c
> >   client_test_LDADD = libtest-runner.la
> >   display_test_SOURCES = tests/display-test.c
> > diff --git a/tests/free-without-remove.c b/tests/free-without-remove.c
> > new file mode 100644
> > index 0000000..ff468d7
> > --- /dev/null
> > +++ b/tests/free-without-remove.c
> > @@ -0,0 +1,63 @@
> > +/*
> > + * Copyright © 2018 Markus Ongyerth
> > + *
> > + * Permission is hereby granted, free of charge, to any person obtaining
> > + * a copy of this software and associated documentation files (the
> > + * "Software"), to deal in the Software without restriction, including
> > + * without limitation the rights to use, copy, modify, merge, publish,
> > + * distribute, sublicense, and/or sell copies of the Software, and to
> > + * permit persons to whom the Software is furnished to do so, subject to
> > + * the following conditions:
> > + *
> > + * The above copyright notice and this permission notice (including the
> > + * next paragraph) shall be included in all copies or substantial
> > + * portions of the Software.
> > + *
> > + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
> > + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
> > + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
> > + * NONINFRINGEMENT.  IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
> > + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
> > + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
> > + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
> > + * SOFTWARE.
> > + */
> > +
> > +#include <stdio.h>
> > +#include <stdlib.h>
> > +#include <stdarg.h>
> > +#include <string.h>
> > +#include <assert.h>
> > +#include <sys/socket.h>
> > +#include <unistd.h>
> > +#include <errno.h>
> > +#include <sys/types.h>
> > +#include <sys/stat.h>
> > +
> > +#include "wayland-private.h"
> > +#include "wayland-server.h"
> > +#include "test-runner.h"
> > +
> > +static void
> > +display_destroy_notify(struct wl_listener *l, void *data)
> > +{
> > +   l->link.prev = l->link.next = NULL;
> > +}
> > +
> > +TEST(free_without_remove)
> > +{
> > +   struct wl_display *display;
> > +   struct wl_listener a, b;
> > +
> > +   display = wl_display_create();
> > +   a.notify = display_destroy_notify;
> > +   b.notify = display_destroy_notify;
> > +
> > +   wl_display_add_destroy_listener(display, &a);
> > +   wl_display_add_destroy_listener(display, &b);
> > +
> > +   wl_display_destroy(display);
> > +
> > +   assert(a.link.next == a.link.prev && a.link.next == NULL);
> > +   assert(b.link.next == b.link.prev && b.link.next == NULL);
> 
> I feel this would be slightly more clear if it tested
> a.link.next == NULL && a.link.prev == NULL
Possibly.
> 
> As my previously submit test did... is this significantly more rigorous than
> my test here: https://patchwork.freedesktop.org/patch/206013/  ?
Did you try to run this one? It *fails* on the current version of libwayland, 
because wl_priv_signal_emit will write into one of the wl_listeners after it 
got emitted.

This only happens where there's more than one listener in the signal list, 
which is the reason your test doesn't catch it.
> 
> Thanks,
> Derek
> 
> > +}
> > 
> 
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> wayland-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/wayland-devel

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