From 2fe131459ce7c0de9457cfd147e48b8637baad19 Mon Sep 17 00:00:00 2001
From: compudj <compudj@04897980-b3bd-0310-b5e0-8ef037075253>
Date: Wed, 5 Dec 2007 18:08:54 +0000
Subject: [PATCH] revert

git-svn-id: http://ltt.polymtl.ca/svn@2784 04897980-b3bd-0310-b5e0-8ef037075253
---
 ltt/branches/poly/lttv/lttv/state.c | 41 ++++++++++++++++++++++++++---
 1 file changed, 38 insertions(+), 3 deletions(-)

diff --git a/ltt/branches/poly/lttv/lttv/state.c b/ltt/branches/poly/lttv/lttv/state.c
index bcb44f5a..c02a3227 100644
--- a/ltt/branches/poly/lttv/lttv/state.c
+++ b/ltt/branches/poly/lttv/lttv/state.c
@@ -2239,17 +2239,23 @@ lttv_state_find_process_or_create(LttvTraceState *ts, guint cpu, guint pid,
  * has the flag SA_NOCLDWAIT. It can also happen when the child is part
  * of a killed thread group, but isn't the leader.
  */
-static void exit_process(LttvTracefileState *tfs, LttvProcessState *process) 
+static int exit_process(LttvTracefileState *tfs, LttvProcessState *process) 
 {
   LttvTraceState *ts = LTTV_TRACE_STATE(tfs->parent.t_context);
   LttvProcessState key;
 
+  /* Wait for both schedule with exit dead and process free to happen.
+   * They can happen in any order. */
+  if (++(process->free_events) < 2)
+    return 0;
+
   key.pid = process->pid;
   key.cpu = process->cpu;
   g_hash_table_remove(ts->processes, &key);
   g_array_free(process->execution_stack, TRUE);
   g_array_free(process->user_stack, TRUE);
   g_free(process);
+  return 1;
 }
 
 
@@ -2674,8 +2680,10 @@ static gboolean schedchange(void *hook_data, void *call_data)
       
       if(state_out == 32 || state_out == 64) { /* EXIT_DEAD || TASK_DEAD */
         /* see sched.h for states */
-        process->state->s = LTTV_STATE_DEAD;
-        process->state->change = s->parent.timestamp;
+        if (!exit_process(s, process)) {
+          process->state->s = LTTV_STATE_DEAD;
+          process->state->change = s->parent.timestamp;
+	}
       }
     }
   }
@@ -2857,6 +2865,33 @@ static gboolean process_free(void *hook_data, void *call_data)
   process = lttv_state_find_process(ts, ANY_CPU, release_pid);
   if(likely(process != NULL))
     exit_process(s, process);
+  return FALSE;
+//DISABLED
+  if(likely(process != NULL)) {
+    /* release_task is happening at kernel level : we can now safely release
+     * the data structure of the process */
+    //This test is fun, though, as it may happen that 
+    //at time t : CPU 0 : process_free
+    //at time t+150ns : CPU 1 : schedule out
+    //Clearly due to time imprecision, we disable it. (Mathieu)
+    //If this weird case happen, we have no choice but to put the 
+    //Currently running process on the cpu to 0.
+    //I re-enable it following time precision fixes. (Mathieu)
+    //Well, in the case where an process is freed by a process on another CPU
+    //and still scheduled, it happens that this is the schedchange that will
+    //drop the last reference count. Do not free it here!
+    guint num_cpus = ltt_trace_get_num_cpu(ts->parent.t);
+    guint i;
+    for(i=0; i< num_cpus; i++) {
+      //g_assert(process != ts->running_process[i]);
+      if(process == ts->running_process[i]) {
+        //ts->running_process[i] = lttv_state_find_process(ts, i, 0);
+        break;
+      }
+    }
+    if(i == num_cpus) /* process is not scheduled */
+      exit_process(s, process);
+  }
 
   return FALSE;
 }
-- 
2.34.1