Round-tripping pointers via gsize is not guaranteed to work (the C standard
only requires this for (u)inptr_t) and in fact breaks on CHERI-enabled
systems such as Arm Morello where pointers are 128-bits but size_t is 64.
This means the current casts would strip the high bits of the pointer and
return a non-dereferenceable value. Fix this by casting the operand that
holds the pointer to guintptr instead of gsize.
Helps: https://gitlab.gnome.org/GNOME/glib/-/issues/2842
This is required for CHERI systems such as Arm Morello, where gsize is
not large enough to hold a pointer. For all other architectures this
should not result in any functional changes since gsize is already the
same size (and I believe for most architectures even the same type)
as guintptr.
This is fully ABI compatible with all currently supported architectures
and should also be fully API compatible except for some rather unlikely
examples such as someone happening to use something like
`decltype(g_atomic_pointer_add(&a, 0))` in a C++ context where it
changes name mangling of some function.
Helps: https://gitlab.gnome.org/GNOME/glib/-/issues/2842
Use a gpointer* instead of a gsize* as the g_atomic_pointer_* argument.
This is required for architectures such as Arm Morello where gsize is
64 bits but gpointer is 128 bits.
Helps: https://gitlab.gnome.org/GNOME/glib/-/issues/2842
If no error with -Werror=sign-conversion, the resulting object file
does not differ from compilation without -Werror=sign-conversion.
So the -Werror argument is now applied directly to string.c and testing.c.
Finally, the currently specific -Werror targets string-macro and
testing-macro are removed.
We can't easily use g_autofd with g_unix_open_pipe, because its
parameter is an array of two fds that both need closing. Add an inline
convenience wrapper providing the obvious semantics.
Signed-off-by: Simon McVittie <smcv@collabora.com>
g_clear_fd() is documented to be async-signal safe whenever the
fd is either negative or valid (which it should be here) and the error
is NULL (which it always is here).
Signed-off-by: Simon McVittie <smcv@collabora.com>
It's not very likely, but there is a small chance that an
incoming signal could disturb the non-blocking read calls in
g_wakeup_acknowledge, leading to a subsequent spurious wake up.
This commit addresses the problem by doing the usual EINTR
loop (which is already present on the write side incidentally)
Previously, this would loop as long as read() got the expected number of
bytes back, which is 8. That means every successful read() of the eventfd
would perform an additional syscall() as a followup.
This is not ideal because eventfd (unless used as an EFD_SEMAPHORE) will
reset the counter as part of the read(). So that means that we either do
an additional throw-away syscall() or potentially race against a producer
generating new events before this change.
Currently the GSourceList has it's own allocation plus a secondary
allocation for the GList which contains it (from GMainContext). Not only
are these a pointer chase, but they are on separate cachelines too. Without
changing the code much we can at least keep things on the same cacheline
so that the pointer chase matters less.
Since the GList becomes embedded in the GSourceList you can use a
g_queue_unlink() directly removing the link without traversing the GList
like was done before.
Furthermore, we can simplify some code with g_queue_push_tail_link()
instead of some extra branching.
This should not result in any functional changes, but will eventually
allow glib to be functional on CHERI-enabled systems such as Morello.
Helps: https://gitlab.gnome.org/GNOME/glib/-/issues/2842
These functions can be used to initalize pointer-type variables rather
than a gsize. This is required to support CHERI-enabled platforms where
gsize cannot be used to store pointers. Follow-up changes will migrate
the uses of g_once_init that store pointers to the new API
Helps: https://gitlab.gnome.org/GNOME/glib/-/issues/2842
One test key was serving two purposes, which meant tests for it couldn’t
be separated out. It was testing escape-at-end-of-line and also
invalid-escape.
Signed-off-by: Philip Withnall <pwithnall@endlessos.org>
Helps: #3098
