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authorTom Tromey <tom@tromey.com>2019-09-29 08:50:15 -0600
committerTom Tromey <tom@tromey.com>2019-11-26 14:02:57 -0700
commit21987b9c060033d367abc50c29f786df4c21b10c (patch)
tree6071a96c314722b150c9a228478d594ed11c68b0 /gdb/config.in
parent5e03027845ecc877621ea71bc342a30ecf2999ff (diff)
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Add RAII class for blocking gdb signals
This adds configury support and an RAII class that can be used to temporarily block signals that are used by gdb. (This class is not used in this patch, but it split out for easier review.) The idea of this patch is that these signals should only be delivered to the main thread. So, when creating a background thread, they are temporarily blocked; the blocked state is inherited by the new thread. The sigprocmask man page says: The use of sigprocmask() is unspecified in a multithreaded process; see pthread_sigmask(3). This patch changes gdb to use pthread_sigmask when appropriate, by introducing a convenience define. I've updated gdbserver as well, because I had to touch gdbsupport, and because the threading patches will make it link against the thread library. I chose not to touch the NTO code, because I don't know anything about that platform and because I cannot test it. Finally, this modifies an existing spot in the Guile layer to use the new facility. gdb/ChangeLog 2019-11-26 Tom Tromey <tom@tromey.com> * gdbsupport/signals-state-save-restore.c (original_signal_mask): Remove comment. (save_original_signals_state, restore_original_signals_state): Use gdb_sigmask. * linux-nat.c (block_child_signals, restore_child_signals_mask) (_initialize_linux_nat): Use gdb_sigmask. * guile/guile.c (_initialize_guile): Use block_signals. * Makefile.in (HFILES_NO_SRCDIR): Add gdb-sigmask.h. * gdbsupport/gdb-sigmask.h: New file. * event-top.c (async_sigtstp_handler): Use gdb_sigmask. * cp-support.c (gdb_demangle): Use gdb_sigmask. * gdbsupport/common.m4 (GDB_AC_COMMON): Check for pthread_sigmask. * configure, config.in: Rebuild. * gdbsupport/block-signals.h: New file. gdb/gdbserver/ChangeLog 2019-11-26 Tom Tromey <tom@tromey.com> * remote-utils.c (block_unblock_async_io): Use gdb_sigmask. * linux-low.c (linux_wait_for_event_filtered, linux_async): Use gdb_sigmask. * configure, config.in: Rebuild. Change-Id: If3f37dc57dd859c226e9e4d79458a0514746e8c6
Diffstat (limited to 'gdb/config.in')
-rw-r--r--gdb/config.in3
1 files changed, 3 insertions, 0 deletions
diff --git a/gdb/config.in b/gdb/config.in
index f20693b..61e63e2 100644
--- a/gdb/config.in
+++ b/gdb/config.in
@@ -342,6 +342,9 @@
/* Have PTHREAD_PRIO_INHERIT. */
#undef HAVE_PTHREAD_PRIO_INHERIT
+/* Define to 1 if you have the `pthread_sigmask' function. */
+#undef HAVE_PTHREAD_SIGMASK
+
/* Define to 1 if you have the `ptrace64' function. */
#undef HAVE_PTRACE64