The documentation for g_spawn_async_with_pipes_and_fds() states:
> If an error occurs, child_pid, stdin_pipe_out, stdout_pipe_out, and
> stderr_pipe_out will not be filled with valid values.
Before 2dc3a6f0c80e5a8f786369eee0c45bfe19b55f4f, the `child_pid`
argument was `self->pid`, and GObject zero-initializes structs. So
the pid field was properly initialized to zero.
After 2dc3a6f0c80e5a8f786369eee0c45bfe19b55f4f, however, the out
variable is now declared inside initable_init(), and it's unitialized.
So if g_spawn_async_with_pipes_and_fds() errors out, `pid` will have
trash value in it, and the following assertion will fail:
```
g_assert (success == (pid != 0));
```
Fix that by initializing the `pid` variable to zero. Add a test to
exercise the fail code path, and prevent errors like this in the
future.
The process PID is initialized by the initable vfunc, while
g_subprocess_exited sets it again, when we're protecting it via a lock.
The status is set when the process exits instead, again while locking.
This makes the thread sanitizer unhappy (even if it shouldn't really be
a race for the PID init case), but still locking during initialization is
not a bad thing to do.
At the same time g_subprocess_wait() and friends were using the pid and status
values without any protection, so let's ensure this is not the case anymore.
WARNING: ThreadSanitizer: data race (pid=8213)
Write of size 4 at 0x7b200000084c by thread T1:
#0 g_subprocess_exited ../gio/gsubprocess.c:284
#1 g_child_watch_dispatch ../glib/gmain.c:5963
#2 g_main_dispatch ../glib/gmain.c:3373
#3 g_main_context_dispatch_unlocked ../glib/gmain.c:4224
#4 g_main_context_iterate_unlocked ../glib/gmain.c:4289
#5 g_main_context_iteration ../glib/gmain.c:4354
#6 glib_worker_main ../glib/gmain.c:6553
#7 g_thread_proxy ../glib/gthread.c:892
Previous read of size 4 at 0x7b200000084c by main thread:
#0 g_subprocess_wait ../gio/gsubprocess.c:908
#1 g_subprocess_wait_check ../gio/gsubprocess.c:939
#2 end_element ../gio/glib-compile-resources.c:342
#3 emit_end_element ../glib/gmarkup.c:1045
#4 g_markup_parse_context_parse ../glib/gmarkup.c:1603
#5 parse_resource_file ../gio/glib-compile-resources.c:578
#6 main ../gio/glib-compile-resources.c:967
Location is heap block of size 120 at 0x7b2000000800 allocated by main
thread:
#0 calloc <null>
#1 g_malloc0 ../glib/gmem.c:133
#2 g_type_create_instance ../gobject/gtype.c:1933
#3 g_object_new_internal ../gobject/gobject.c:2621
#4 g_object_new_valist ../gobject/gobject.c:2960
#5 g_initable_new_valist ../gio/ginitable.c:245
#6 g_initable_new ../gio/ginitable.c:163
#7 g_subprocess_newv ../gio/gsubprocess.c:619
#8 g_subprocess_new ../gio/gsubprocess.c:590
#9 end_element ../gio/glib-compile-resources.c:334
#10 emit_end_element ../glib/gmarkup.c:1045
#11 g_markup_parse_context_parse ../glib/gmarkup.c:1603
#12 parse_resource_file ../gio/glib-compile-resources.c:578
#13 main ../gio/glib-compile-resources.c:967
Thread T1 'gmain' (tid=8228, running) created by main thread at:
#0 pthread_create <null>
#1 g_system_thread_new ../glib/gthread-posix.c:762
#2 g_thread_new_internal ../glib/gthread.c:996
#3 g_thread_new ../glib/gthread.c:949
#4 g_get_worker_context ../glib/gmain.c:6580
#5 initable_init ../gio/gsubprocess.c:443
#6 g_initable_init ../gio/ginitable.c:129
#7 g_initable_new_valist ../gio/ginitable.c:249
#8 g_initable_new ../gio/ginitable.c:163
#9 g_subprocess_newv ../gio/gsubprocess.c:619
#10 g_subprocess_new ../gio/gsubprocess.c:590
#11 end_element ../gio/glib-compile-resources.c:334
#12 emit_end_element ../glib/gmarkup.c:1045
#13 g_markup_parse_context_parse ../glib/gmarkup.c:1603
#14 parse_resource_file ../gio/glib-compile-resources.c:578
#15 main ../gio/glib-compile-resources.c:967
SUMMARY: ThreadSanitizer: data race ../gio/gsubprocess.c:284 in
g_subprocess_exited
======================================
WARNING: ThreadSanitizer: data race (pid=15959)
Read of size 4 at 0x7b200000084c by main thread:
#0 g_subprocess_wait ../gio/gsubprocess.c:913
#1 g_subprocess_wait_check ../gio/gsubprocess.c:944
#2 test_cat_utf8 ../gio/tests/gsubprocess.c:489
#3 test_case_run ../glib/gtestutils.c:3115
#4 g_test_run_suite_internal ../glib/gtestutils.c:3210
#5 g_test_run_suite_internal ../glib/gtestutils.c:3229
#6 g_test_run_suite ../glib/gtestutils.c:3310
#7 g_test_run ../glib/gtestutils.c:2379
#8 main ../gio/tests/gsubprocess.c:2266
Previous write of size 4 at 0x7b200000084c by thread T1:
#0 g_subprocess_exited ../gio/gsubprocess.c:284
#1 g_child_watch_dispatch ../glib/gmain.c:5963
#2 g_main_dispatch ../glib/gmain.c:3373
#3 g_main_context_dispatch_unlocked ../glib/gmain.c:4224
#4 g_main_context_iterate_unlocked ../glib/gmain.c:4289
#5 g_main_context_iteration ../glib/gmain.c:4354
#6 glib_worker_main ../glib/gmain.c:6553
#7 g_thread_proxy ../glib/gthread.c:892
This is a minor performance improvement, since the pspec list for the
class now only has to be modified once, rather than twice.
It also means we now have the `GParamSpec` pointers to hand in a `props`
array, which will be used in the upcoming commits.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
This lets the compiler tell us if we’ve accidentally missed a property
implementation from `get_property()` or `set_property()`.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
As per previous commit we used atomic logic to handle the cancellation,
but that lead to a slightly different behavior because the file monitor
was then marked as cancelled before the vfunc implementation was called.
Use similar behavior now (by still relying on the atomic logic), by
marking the state as about-to-cancel as soon as we're starting the
cancellation (preventing other threads to cancel it), and eventually
fully marking it as cancelled.
The cancelled state may be set and read by different threads, so ensure
that it's stored and managed in an atomic way.
We could in fact end up check for `g_file_monitor_is_cancelled()` in a
thread and `g_file_monitor_cancel()` or `g_file_monitor_emit_event` in
in another one.
Adding some initial test for the compiler behavior and its expected
output.
Also, when using sanitizers we want to be able to test the compiler memory
management.
We were reusing the same logic everywhere, while we can just reuse an
unique class to base our tests on that avoids having to copy-and-paste
code for no good reason
Add some basic support for having glib-tests-only python libraries that
can be shared across the various projects, so that we don't have to
maintain multiple copies of them.
Move the shebang line from the full Python path of the build
machine to the first Python on the path during runtime. Set
the shebang in the main meson.build file so that it can be
overridden in one place if needed.
Fixes: #3331
As gettext does:
* if C locale is used to set a value, set the untranslated value, i.e.
key=value and not key[C]=value;
* if C locale is used to get a value, return the untranslated value,
i.e. not the value from key[C]=value, if it ever exists, and do not
consider C as an undefined locale otherwise.
Fixes: #3578
Link to the toolchain requirements, which are kept up to date, rather
than duplicating them across multiple documents.
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
This will warn if GLib is configured with a toolchain which doesn’t
support C11. We currently require C99. If nobody complains (as directed
by this warning) we will start to require C11 in the next unstable
release series (2.85).
See https://gitlab.gnome.org/GNOME/glib/-/merge_requests/3574#note_1859924
Signed-off-by: Philip Withnall <pwithnall@gnome.org>
