[PATCH] Fix AIX thread exit events not being reported and UI to show kernel thread ID.

[Aditya Vidyadhar Kamath <akamath996@gmail.com>]

From: Aditya Vidyadhar Kamath <Aditya.Kamath1@ibm.com>

In AIX when a thread exits we were not showing that a thread exit event happened
and GDB continued to keep the terminated threads.

If we have terminated threads then the UI on info threads command will look like
(gdb) info threads
  Id   Target Id                                          Frame
* 1    Thread 1 (tid 26607979, running)    0xd0611d70 in _p_nsleep () from /usr/lib/libpthreads.a(_shr_xpg5.o)
  2    Thread 258 (tid 30998799, finished) aix-thread: ptrace (52, 30998799) returned -1 (errno = 3 The process does not exist.)

If we see the frame is not getting displayed correctly.

The reason for the same is that in AIX we were not managing thread states. In particular we do not know
when a thread terminates.

The reason being in sync_threadlists () the pbuf and gbuf lists remain the same though certain threads exit.

This patch is a fix to the same.

Also certain UI is changed.

On a new thread born and exit the UI in AIX will be similar to Linux with both user and kernel thread information.

[New Thread 258 (tid 32178533)]
[New Thread 515 (tid 30343651)]
[New Thread 772 (tid 33554909)]
[New Thread 1029 (tid 24969489)]
[New Thread 1286 (tid 18153945)]
[New Thread 1543 (tid 30736739)]
[Thread 258 (tid 32178533) exited]
[Thread 515 (tid 30343651) exited]
[Thread 772 (tid 33554909) exited]
[Thread 1029 (tid 24969489) exited]
[Thread 1286 (tid 18153945) exited]
[Thread 1543 (tid 30736739) exited]

and info threads will look like
(gdb) info threads
  Id   Target Id                           Frame
* 1    Thread 1 (tid 31326579) ([running]) 0xd0611d70 in _p_nsleep () from /usr/lib/libpthread.a(_shr_xpg5.o)
---
 gdb/aix-thread.c | 91 ++++++++++++++++++++++++++++++------------------
 1 file changed, 57 insertions(+), 34 deletions(-)

diff --git a/gdb/aix-thread.c b/gdb/aix-thread.c
index c70bd82bc24..5ccccf02879 100644
--- a/gdb/aix-thread.c
+++ b/gdb/aix-thread.c
@@ -55,6 +55,7 @@
 #include <sys/reg.h>
 #include <sched.h>
 #include <sys/pthdebug.h>
+#include <vector>
 
 #if !HAVE_DECL_GETTHRDS
 extern int getthrds (pid_t, struct thrdsinfo64 *, int, tid_t *, int);
@@ -190,6 +191,9 @@ struct aix_thread_variables
   /* Whether the current architecture is 64-bit.
    Only valid when pd_able is true.  */
   int arch64;
+
+  /* Describes the number of thread born events have been reported.  */
+  int threads_reported = 0;
 };
 
 /* Key to our per-inferior data.  */
@@ -740,11 +744,9 @@ state2str (pthdb_state_t state)
 /* qsort() comparison function for sorting pd_thread structs by pthid.  */
 
 static int
-pcmp (const void *p1v, const void *p2v)
+pcmp (struct pd_thread p1v, struct pd_thread p2v)
 {
-  struct pd_thread *p1 = (struct pd_thread *) p1v;
-  struct pd_thread *p2 = (struct pd_thread *) p2v;
-  return p1->pthid < p2->pthid ? -1 : p1->pthid > p2->pthid;
+  return p1v.pthid < p2v.pthid;
 }
 
 /* ptid comparison function */
@@ -823,7 +825,6 @@ sync_threadlists (pid_t pid)
 {
   int cmd, status;
   int pcount, psize, pi, gcount, gi;
-  struct pd_thread *pbuf;
   struct thread_info **gbuf, **g, *thread;
   pthdb_pthread_t pdtid;
   pthread_t pthid;
@@ -831,12 +832,13 @@ sync_threadlists (pid_t pid)
   process_stratum_target *proc_target = current_inferior ()->process_target ();
   struct aix_thread_variables *data;
   data = get_thread_data_helper_for_pid (pid);
+  std::vector<pd_thread> pbuf;
+  struct pd_thread aix_pd_thread;
 
   /* Accumulate an array of libpthdebug threads sorted by pthread id.  */
 
   pcount = 0;
   psize = 1;
-  pbuf = XNEWVEC (struct pd_thread, psize);
 
   for (cmd = PTHDB_LIST_FIRST;; cmd = PTHDB_LIST_NEXT)
     {
@@ -848,27 +850,36 @@ sync_threadlists (pid_t pid)
       if (status != PTHDB_SUCCESS || pthid == PTHDB_INVALID_PTID)
 	continue;
 
-      if (pcount == psize)
-	{
-	  psize *= 2;
-	  pbuf = (struct pd_thread *) xrealloc (pbuf, 
-						psize * sizeof *pbuf);
-	}
-      pbuf[pcount].pdtid = pdtid;
-      pbuf[pcount].pthid = pthid;
+      aix_pd_thread.pdtid = pdtid;
+      aix_pd_thread.pthid = pthid;
+      pbuf.push_back (aix_pd_thread);
       pcount++;
     }
 
-  for (pi = 0; pi < pcount; pi++)
+  for (auto it = pbuf.begin (); it != pbuf.end ();)
     {
-      status = pthdb_pthread_tid (data->pd_session, pbuf[pi].pdtid, &tid);
+      status = pthdb_pthread_tid (data->pd_session, (*it).pdtid, &tid);
       if (status != PTHDB_SUCCESS)
 	tid = PTHDB_INVALID_TID;
-      pbuf[pi].tid = tid;
-    }
 
-  qsort (pbuf, pcount, sizeof *pbuf, pcmp);
+      (*it).tid = tid;
+      pthdb_state_t state;
+
+      status = pthdb_pthread_state (data->pd_session, (*it).pdtid, &state);
 
+      /* If the thread is terminated and has not reported its existence
+	 or new thread event, then wait for it to report.  We want users
+	 to know threads were added and then delete. So first add them to
+	 pbuf and the next time sync_threadlists is called delete them since
+	 data->threads_reported is guarenteed to be greater than 0.  */
+
+      if (state == PST_TERM && data->threads_reported > 0)
+	pbuf.erase (it);
+      else
+	++it;
+    }
+
+  std::sort (pbuf.begin (), pbuf.end (), pcmp);
   /* Accumulate an array of GDB threads sorted by pid.  */
 
   /* gcount is GDB thread count and pcount is pthreadlib thread count.  */
@@ -881,6 +892,7 @@ sync_threadlists (pid_t pid)
     *g++ = tp;
   qsort (gbuf, gcount, sizeof *gbuf, gcmp);
 
+  pcount = pbuf.size ();
   /* Apply differences between the two arrays to GDB's thread list.  */
 
   for (pi = gi = 0; pi < pcount || gi < gcount;)
@@ -889,6 +901,12 @@ sync_threadlists (pid_t pid)
 	{
 	  delete_thread (gbuf[gi]);
 	  gi++;
+	  data->threads_reported--;
+
+	  /* Since main thread is reported.  */
+
+	  if (data->threads_reported == 0)
+	    data->threads_reported = 1;
 	}
       else if (gi == gcount)
 	{
@@ -901,6 +919,7 @@ sync_threadlists (pid_t pid)
 					 private_thread_info_up (priv));
 
 	  pi++;
+	  data->threads_reported++;
 	}
       else
 	{
@@ -913,7 +932,6 @@ sync_threadlists (pid_t pid)
 	  tid = pbuf[pi].tid;
 
 	  cmp_result = ptid_cmp (pptid, gptid);
-
 	  if (cmp_result == 0)
 	    {
 	      aix_thread_info *priv = get_aix_thread_info (gbuf[gi]);
@@ -943,6 +961,10 @@ sync_threadlists (pid_t pid)
 		{
 		  delete_thread (gbuf[gi]);
 		  gi++;
+		  data->threads_reported--;
+
+		  if (data->threads_reported == 0)
+		    data->threads_reported = 1;
 		}
 	    }
 	  else
@@ -954,11 +976,11 @@ sync_threadlists (pid_t pid)
 	      priv->pdtid = pdtid;
 	      priv->tid = tid;
 	      pi++;
+	      data->threads_reported++;
 	    }
 	}
     }
 
-  xfree (pbuf);
   xfree (gbuf);
 }
 
@@ -2084,10 +2106,17 @@ aix_thread_target::thread_alive (ptid_t ptid)
 std::string
 aix_thread_target::pid_to_str (ptid_t ptid)
 {
-  if (ptid.tid () == 0)
-    return beneath ()->pid_to_str (ptid);
+  thread_info *thread_info = current_inferior ()->find_thread (ptid);
+
+  if (thread_info != NULL && thread_info->priv != NULL)
+    {
+      aix_thread_info *priv = get_aix_thread_info (thread_info);
+
+      return string_printf (_("Thread %s (tid %s)"), pulongest (ptid.tid ()),
+		pulongest (priv->tid));
+    }
 
-  return string_printf (_("Thread %s"), pulongest (ptid.tid ()));
+  return beneath ()->pid_to_str (ptid);
 }
 
 /* Return a printable representation of extra information about
@@ -2098,7 +2127,6 @@ aix_thread_target::extra_thread_info (struct thread_info *thread)
 {
   int status;
   pthdb_pthread_t pdtid;
-  pthdb_tid_t tid;
   pthdb_state_t state;
   pthdb_suspendstate_t suspendstate;
   pthdb_detachstate_t detachstate;
@@ -2115,33 +2143,28 @@ aix_thread_target::extra_thread_info (struct thread_info *thread)
   aix_thread_info *priv = get_aix_thread_info (thread);
 
   pdtid = priv->pdtid;
-  tid = priv->tid;
-
-  if (tid != PTHDB_INVALID_TID)
-    /* i18n: Like "thread-identifier %d, [state] running, suspended" */
-    buf.printf (_("tid %d"), (int)tid);
 
   status = pthdb_pthread_state (data->pd_session, pdtid, &state);
   if (status != PTHDB_SUCCESS)
     state = PST_NOTSUP;
-  buf.printf (", %s", state2str (state));
+  buf.printf ("[%s]", state2str (state));
 
   status = pthdb_pthread_suspendstate (data->pd_session, pdtid,
 				       &suspendstate);
   if (status == PTHDB_SUCCESS && suspendstate == PSS_SUSPENDED)
     /* i18n: Like "Thread-Id %d, [state] running, suspended" */
-    buf.printf (_(", suspended"));
+    buf.printf (_("[suspended]"));
 
   status = pthdb_pthread_detachstate (data->pd_session, pdtid,
 				      &detachstate);
   if (status == PTHDB_SUCCESS && detachstate == PDS_DETACHED)
     /* i18n: Like "Thread-Id %d, [state] running, detached" */
-    buf.printf (_(", detached"));
+    buf.printf (_("[detached]"));
 
   pthdb_pthread_cancelpend (data->pd_session, pdtid, &cancelpend);
   if (status == PTHDB_SUCCESS && cancelpend)
     /* i18n: Like "Thread-Id %d, [state] running, cancel pending" */
-    buf.printf (_(", cancel pending"));
+    buf.printf (_("[cancel pending]"));
 
   buf.write ("", 1);
 
-- 
2.41.0