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From: Pedro Alves <pedro@palves.net>
To: gdb-patches@sourceware.org
Subject: [PATCH 19/31] Implement GDB_THREAD_OPTION_EXIT support for native Linux
Date: Mon, 12 Dec 2022 20:30:49 +0000	[thread overview]
Message-ID: <20221212203101.1034916-20-pedro@palves.net> (raw)
In-Reply-To: <20221212203101.1034916-1-pedro@palves.net>

This implements support for the new GDB_THREAD_OPTION_EXIT thread
option for native Linux.

Change-Id: Ia69fc0b9b96f9af7de7cefc1ddb1fba9bbb0bb90
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27338
---
 gdb/linux-nat.c | 44 +++++++++++++++++++++++++++++++-------------
 1 file changed, 31 insertions(+), 13 deletions(-)

diff --git a/gdb/linux-nat.c b/gdb/linux-nat.c
index b576ce60b75..75f81edf20a 100644
--- a/gdb/linux-nat.c
+++ b/gdb/linux-nat.c
@@ -269,6 +269,18 @@ pending_status_str (lwp_info *lp)
     return status_to_str (lp->status);
 }
 
+/* Return true if we should report exit events for LP.  */
+
+static bool
+report_exit_events_for (lwp_info *lp)
+{
+  thread_info *thr = find_thread_ptid (linux_target, lp->ptid);
+  gdb_assert (thr != nullptr);
+
+  return (report_thread_events
+	  || (thr->thread_options () & GDB_THREAD_OPTION_EXIT) != 0);
+}
+
 \f
 /* LWP accessors.  */
 
@@ -2131,8 +2143,7 @@ wait_lwp (struct lwp_info *lp)
       /* Check if the thread has exited.  */
       if (WIFEXITED (status) || WIFSIGNALED (status))
 	{
-	  if (report_thread_events
-	      || lp->ptid.pid () == lp->ptid.lwp ())
+	  if (report_exit_events_for (lp) || is_leader (lp))
 	    {
 	      linux_nat_debug_printf ("LWP %d exited.", lp->ptid.pid ());
 
@@ -2913,7 +2924,7 @@ linux_nat_filter_event (int lwpid, int status)
   /* Check if the thread has exited.  */
   if (WIFEXITED (status) || WIFSIGNALED (status))
     {
-      if (!report_thread_events && !is_leader (lp))
+      if (!report_exit_events_for (lp) && !is_leader (lp))
 	{
 	  linux_nat_debug_printf ("%s exited.",
 				  lp->ptid.to_string ().c_str ());
@@ -3123,10 +3134,11 @@ check_zombie_leaders (void)
     }
 }
 
-/* Convenience function that is called when the kernel reports an exit
-   event.  This decides whether to report the event to GDB as a
-   process exit event, a thread exit event, or to suppress the
-   event.  */
+/* Convenience function that is called when we're about to return an
+   event to the core.  If the event is an exit or signalled event,
+   then this decides whether to report it as process-wide event, as a
+   thread exit event, or to suppress it.  All other event kinds are
+   passed through unmodified.  */
 
 static ptid_t
 filter_exit_event (struct lwp_info *event_child,
@@ -3134,9 +3146,17 @@ filter_exit_event (struct lwp_info *event_child,
 {
   ptid_t ptid = event_child->ptid;
 
+  /* Note we must filter TARGET_WAITKIND_SIGNALLED as well, otherwise
+     if a non-leader thread exits with a signal, we'd report it to the
+     core which would interpret it as the whole-process exiting.
+     There is no TARGET_WAITKIND_THREAD_SIGNALLED event kind.  */
+  if (ourstatus->kind () != TARGET_WAITKIND_EXITED
+      && ourstatus->kind () != TARGET_WAITKIND_SIGNALLED)
+    return ptid;
+
   if (!is_leader (event_child))
     {
-      if (report_thread_events)
+      if (report_exit_events_for (event_child))
 	{
 	  ourstatus->set_thread_exited (0);
 	  /* Delete lwp, but not thread_info, infrun will need it to
@@ -3369,10 +3389,7 @@ linux_nat_wait_1 (ptid_t ptid, struct target_waitstatus *ourstatus,
   else
     lp->core = linux_common_core_of_thread (lp->ptid);
 
-  if (ourstatus->kind () == TARGET_WAITKIND_EXITED)
-    return filter_exit_event (lp, ourstatus);
-
-  return lp->ptid;
+  return filter_exit_event (lp, ourstatus);
 }
 
 /* Resume LWPs that are currently stopped without any pending status
@@ -4479,7 +4496,8 @@ linux_nat_target::thread_events (int enable)
 bool
 linux_nat_target::supports_set_thread_options (gdb_thread_options options)
 {
-  constexpr gdb_thread_options supported_options = GDB_THREAD_OPTION_CLONE;
+  constexpr gdb_thread_options supported_options
+    = GDB_THREAD_OPTION_CLONE | GDB_THREAD_OPTION_EXIT;
   return ((options & supported_options) == options);
 }
 
-- 
2.36.0


  parent reply	other threads:[~2022-12-12 20:31 UTC|newest]

Thread overview: 100+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-12-12 20:30 [PATCH 00/31] Step over thread clone and thread exit Pedro Alves
2022-12-12 20:30 ` [PATCH 01/31] displaced step: pass down target_waitstatus instead of gdb_signal Pedro Alves
2023-02-03 10:44   ` Andrew Burgess
2023-03-10 17:15     ` Pedro Alves
2023-03-16 16:07       ` Andrew Burgess
2023-03-22 21:29         ` Andrew Burgess
2023-03-23 15:15           ` Pedro Alves
2023-03-27 12:40             ` Andrew Burgess
2023-03-27 16:21               ` Pedro Alves
2022-12-12 20:30 ` [PATCH 02/31] linux-nat: introduce pending_status_str Pedro Alves
2023-02-03 12:00   ` Andrew Burgess
2023-03-10 17:15     ` Pedro Alves
2023-03-16 16:19       ` Andrew Burgess
2023-03-27 18:05         ` Pedro Alves
2022-12-12 20:30 ` [PATCH 03/31] gdb/linux: Delete all other LWPs immediately on ptrace exec event Pedro Alves
2023-03-21 14:50   ` Andrew Burgess
2023-04-04 13:57     ` Pedro Alves
2023-04-14 19:29       ` Pedro Alves
2023-05-26 15:04         ` Andrew Burgess
2023-11-13 14:04           ` Pedro Alves
2023-05-26 14:45       ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 04/31] Step over clone syscall w/ breakpoint, TARGET_WAITKIND_THREAD_CLONED Pedro Alves
2023-02-04 15:38   ` Andrew Burgess
2023-03-10 17:16     ` Pedro Alves
2023-03-21 16:06       ` Andrew Burgess
2023-11-13 14:05         ` Pedro Alves
2022-12-12 20:30 ` [PATCH 05/31] Support clone events in the remote protocol Pedro Alves
2023-03-22 15:46   ` Andrew Burgess
2023-11-13 14:05     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 06/31] Avoid duplicate QThreadEvents packets Pedro Alves
2023-05-26 15:53   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 07/31] enum_flags to_string Pedro Alves
2023-01-30 20:07   ` Simon Marchi
2022-12-12 20:30 ` [PATCH 08/31] Thread options & clone events (core + remote) Pedro Alves
2023-01-31 12:25   ` Lancelot SIX
2023-03-10 19:16     ` Pedro Alves
2023-06-06 13:29       ` Andrew Burgess
2023-11-13 14:07         ` Pedro Alves
2022-12-12 20:30 ` [PATCH 09/31] Thread options & clone events (native Linux) Pedro Alves
2023-06-06 13:43   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 10/31] Thread options & clone events (Linux GDBserver) Pedro Alves
2023-06-06 14:12   ` Andrew Burgess
2023-11-13 14:07     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 11/31] gdbserver: Hide and don't detach pending clone children Pedro Alves
2023-06-07 16:10   ` Andrew Burgess
2023-11-13 14:08     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 12/31] Remove gdb/19675 kfails (displaced stepping + clone) Pedro Alves
2023-06-07 17:08   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 13/31] Add test for stepping over clone syscall Pedro Alves
2023-06-07 17:42   ` Andrew Burgess
2023-11-13 14:09     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 14/31] all-stop/synchronous RSP support thread-exit events Pedro Alves
2023-06-07 17:52   ` Andrew Burgess
2023-11-13 14:11     ` Pedro Alves
2023-12-15 18:15       ` Pedro Alves
2022-12-12 20:30 ` [PATCH 15/31] gdbserver/linux-low.cc: Ignore event_ptid if TARGET_WAITKIND_IGNORE Pedro Alves
2022-12-12 20:30 ` [PATCH 16/31] Move deleting thread on TARGET_WAITKIND_THREAD_EXITED to core Pedro Alves
2023-06-08 12:27   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 17/31] Introduce GDB_THREAD_OPTION_EXIT thread option, fix step-over-thread-exit Pedro Alves
2023-06-08 13:17   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 18/31] Implement GDB_THREAD_OPTION_EXIT support for Linux GDBserver Pedro Alves
2023-06-08 14:14   ` Andrew Burgess
2022-12-12 20:30 ` Pedro Alves [this message]
2023-06-08 14:17   ` [PATCH 19/31] Implement GDB_THREAD_OPTION_EXIT support for native Linux Andrew Burgess
2022-12-12 20:30 ` [PATCH 20/31] gdb: clear step over information on thread exit (PR gdb/27338) Pedro Alves
2023-06-08 15:29   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 21/31] stop_all_threads: (re-)enable async before waiting for stops Pedro Alves
2023-06-08 15:49   ` Andrew Burgess
2023-11-13 14:12     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 22/31] gdbserver: Queue no-resumed event after thread exit Pedro Alves
2023-06-08 18:16   ` Andrew Burgess
2023-11-13 14:12     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 23/31] Don't resume new threads if scheduler-locking is in effect Pedro Alves
2023-06-08 18:24   ` Andrew Burgess
2023-11-13 14:12     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 24/31] Report thread exit event for leader if reporting thread exit events Pedro Alves
2023-06-09 13:11   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 25/31] Ignore failure to read PC when resuming Pedro Alves
2023-06-10 10:33   ` Andrew Burgess
2023-11-13 14:13     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 26/31] gdb/testsuite/lib/my-syscalls.S: Refactor new SYSCALL macro Pedro Alves
2023-06-10 10:33   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 27/31] Testcases for stepping over thread exit syscall (PR gdb/27338) Pedro Alves
2023-06-12  9:53   ` Andrew Burgess
2022-12-12 20:30 ` [PATCH 28/31] Document remote clone events, and QThreadOptions packet Pedro Alves
2023-06-05 15:53   ` Andrew Burgess
2023-11-13 14:13     ` Pedro Alves
2023-06-12 12:06   ` Andrew Burgess
2023-11-13 14:15     ` Pedro Alves
2022-12-12 20:30 ` [PATCH 29/31] inferior::clear_thread_list always silent Pedro Alves
2023-06-12 12:20   ` Andrew Burgess
2022-12-12 20:31 ` [PATCH 30/31] Centralize "[Thread ...exited]" notifications Pedro Alves
2023-02-04 16:05   ` Andrew Burgess
2023-03-10 17:21     ` Pedro Alves
2023-02-16 15:40   ` Andrew Burgess
2023-06-12 12:23     ` Andrew Burgess
2022-12-12 20:31 ` [PATCH 31/31] Cancel execution command on thread exit, when stepping, nexting, etc Pedro Alves
2023-06-12 13:12   ` Andrew Burgess
2023-01-24 19:47 ` [PATCH v3 00/31] Step over thread clone and thread exit Pedro Alves
2023-11-13 14:24 ` [PATCH " Pedro Alves

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