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--- gdb/fbsd-nat.c.orig 2016-08-01 17:50:20.000000000 +0200
+++ gdb/fbsd-nat.c 2016-12-14 23:23:39.467449000 +0100
@@ -680,6 +680,9 @@
if (!ptid_match (tp->ptid, *filter))
return 0;
+ if (tp->state == THREAD_EXITED) {
+ return 0;
+ }
if (ptrace (PT_RESUME, ptid_get_lwp (tp->ptid), NULL, 0) == -1)
perror_with_name (("ptrace"));
return 0;
@@ -710,6 +713,14 @@
ptid_get_tid (ptid));
if (ptid_lwp_p (ptid))
{
+#ifndef PT_LWP_EVENTS
+ /* When LWP events are not supported, a new thread might already be
+ running that has not yet reported an event when GDB wishes to
+ only run a single thread. Force an update of the thread list
+ to ensure that any such threads are suspended before the process
+ is resumed. */
+ fbsd_add_threads (ptid_get_pid (ptid));
+#endif
/* If ptid is a specific LWP, suspend all other LWPs in the process. */
iterate_over_threads (resume_one_thread_cb, &ptid);
}
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