When the system supports it (as all Linux kernels ≥ 5.3 should), it’s
preferable to use `pidfd_open()` and `waitid()` to be notified of
child processes exiting or being signalled, rather than installing a
default `SIGCHLD` handler.
A default `SIGCHLD` handler is global, and can never interact well with
other code (from the application or other libraries) which also wants to
install a `SIGCHLD` handler.
This use of `pidfd_open()` is racy (the PID may be reused between
`g_child_watch_source_new()` being called and `pidfd_open()` being
called), so it doesn’t improve behaviour there. For that, we’d need
continuous use of pidfds throughout GLib, from fork/spawn time until
here. See #1866 for that.
The use of `waitid()` to get the process exit status could be expanded
in future to also work for stopped or continued processes (as per #175)
by adding `WSTOPPED | WCONTINUED` into the flags. That’s a behaviour
change which is outside the strict scope of adding pidfd support,
though.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #1866Fixes: #2216
On win32, WaitForSingleObject may return before the timeout is
dispatched, as it doesn't have a resolution higher than the system tick.
Wait for ~50ms before checking the callback changes.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Do not wakeup immediately for our own context wakeup poll registration.
g_main_context_add_poll_unlocked() will call g_wakeup_signal() to wake
up the loop waiting in poll(). Doing so during context creation will
create an extra wakeup for the first poll().
Skip the wakeup call if it is the wake_up_rec registration. No other
sources/caller should ever reach that condition.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
In the case strerror_r returns an error (both in the char* variant and
in the int variant) we should not try to proceed converting the message
and adding to the errors maps, as that's likely causing errors.
So, let's just return a null string in case this happens
We had gcc-only implementations for them while both can be used in all
the supported platforms we have.
So let's just provide generic definitions, while we keep the old ones
for both consistency and retro-compatibility.
If a `.la` file is empty, `lt_libdir` and/or `lt_dlname` won’t be set,
but will then still be used in `g_strconcat()`, leading to invalid
output.
Detect that and return an error.
Adds a unit test.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Coverity CID: #1474756
These headers have all been written manually, by looking through the git
log for each file and noting the copyright of each significant
contribution.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #1415
There’s a precondition assertion on the function which checks that
`group_name != NULL`.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Coverity CID: #1474780
Add tests in which `g_object_run_dispose()` is called on the source or target
of a `GBinding`. After commit a4fa456e67,
the target test caused a failed assertion in `g_weak_ref_set()` that was not
found by the existing tests. Commit 94ba14d542
weakens the assertion to allow the test to succeed.
See https://gitlab.gnome.org/GNOME/glib/-/issues/2676
When weak references are being cleaned up, it is possible for the `qdata` for
both `quark_weak_locations` and `quark_weak_refs` to have been deallocated,
so that `g_datalist_id_get_data()` returns `NULL` for both. This happens
when `g_object_run_dispose()` is called for the target of a `GBinding`,
and is not an error.
See https://gitlab.gnome.org/GNOME/glib/-/issues/2676
It’s failed on a CI machine
(https://gitlab.gnome.org/GNOME/glib/-/jobs/2006694) with log:
```
[unused] => pushed 100 threads onto the idle pool
[unused] stopping unused threads
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] waiting ONE second for threads to die
[unused] stopped idle threads, 9 remain
Bail out! GLib:ERROR:../glib/tests/thread-pool-slow.c:113:test_thread_stop_unused: assertion failed (g_thread_pool_get_num_unused_threads () == 0): (9 == 0)
```
I can’t reproduce this locally, but it’s possible that it failed because
a one second wait was not enough to enqueue all the jobs (on a heavily
loaded machine), and hence some jobs spawned thread pool threads after
calling `g_thread_pool_stop_unused_threads()`, leading to the assertion
failure.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
While `gio_xdgmime` is unlocked, the data which `type` points to in the
xdgmime cache might get invalidated, leaving `type` as a dangling
pointer. That would not bode well for the `g_strdup (type)` call to
insert a new entry into the `type_comment_cache` once `gio_xdgmime` is
re-acquired.
This was spotted using static analysis, and the symptoms have not
knowingly been seen in the wild.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Coverity CID: #1474702
We should mention glib-mkenums in the documentation for
G_DEFINE_ENUM_TYPE and G_DEFINE_FLAGS_TYPE.
We should also mention the macros in the documentation for glib-mkenums.
This way, developers can choose the most appropriate tool for their use
case.
