server: Do not hold reference on parent process.

dlls/kernel32/tests/process.c

@@ -1157,7 +1157,7 @@ static void test_Toolhelp(void)
         Sleep(100);
     }
     /* The following test fails randomly on some Windows versions, but Gothic 2 depends on it */
-    todo_wine ok(i < 20 || broken(i == 20), "process object not released\n");
+    ok(i < 20 || broken(i == 20), "process object not released\n");
 
     snapshot = pCreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
     ok(snapshot != INVALID_HANDLE_VALUE, "CreateToolhelp32Snapshot failed %u\n", GetLastError());

server/console.c

@@ -1424,13 +1424,12 @@ DECL_HANDLER(alloc_console)
     case 0:
         /* renderer is current, console to be attached to parent process */
         renderer = current;
-        if (!(process = current->process->parent))
+        if (!(process = get_process_from_id( current->process->parent_id )))
         {
             if (fd != -1) close( fd );
             set_error( STATUS_ACCESS_DENIED );
             return;
         }
-        grab_object( process );
         attach = 1;
         break;
     case 0xffffffff:

server/process.c

@@ -506,7 +506,7 @@ struct thread *create_process( int fd, struct thread *parent_thread, int inherit
         close( fd );
         goto error;
     }
-    process->parent          = NULL;
+    process->parent_id       = 0;
     process->debugger        = NULL;
     process->handles         = NULL;
     process->msg_fd          = NULL;
@@ -558,7 +558,7 @@ struct thread *create_process( int fd, struct thread *parent_thread, int inherit
     else
     {
         struct process *parent = parent_thread->process;
-        process->parent = (struct process *)grab_object( parent );
+        process->parent_id = parent->id;
         process->handles = inherit_all ? copy_handle_table( process, parent )
                                        : alloc_handle_table( process, 0 );
         /* Note: for security reasons, starting a new process does not attempt
@@ -625,7 +625,6 @@ static void process_destroy( struct object *obj )
         release_object( process->job );
     }
     if (process->console) release_object( process->console );
-    if (process->parent) release_object( process->parent );
     if (process->msg_fd) release_object( process->msg_fd );
     list_remove( &process->entry );
     if (process->idle_event) release_object( process->idle_event );
@@ -1354,7 +1353,7 @@ DECL_HANDLER(get_process_info)
     if ((process = get_process_from_handle( req->handle, PROCESS_QUERY_LIMITED_INFORMATION )))
     {
         reply->pid              = get_process_id( process );
-        reply->ppid             = process->parent ? get_process_id( process->parent ) : 0;
+        reply->ppid             = process->parent_id;
         reply->exit_code        = process->exit_code;
         reply->priority         = process->priority;
         reply->affinity         = process->affinity;

server/process.h

@@ -56,7 +56,7 @@ struct process
 {
     struct object        obj;             /* object header */
     struct list          entry;           /* entry in system-wide process list */
-    struct process      *parent;          /* parent process */
+    process_id_t         parent_id;       /* parent process id (at the time of creation) */
     struct list          thread_list;     /* thread list */
     struct thread       *debugger;        /* thread debugging this process */
     struct handle_table *handles;         /* handle entries */

server/snapshot.c

@@ -115,7 +115,7 @@ static int snapshot_next_process( struct snapshot *snapshot, struct next_process
     ptr = &snapshot->processes[snapshot->process_pos++];
     reply->count    = ptr->count;
     reply->pid      = get_process_id( ptr->process );
-    reply->ppid     = ptr->process->parent ? get_process_id( ptr->process->parent ) : 0;
+    reply->ppid     = ptr->process->parent_id;
     reply->threads  = ptr->threads;
     reply->priority = ptr->priority;
     reply->handles  = ptr->handles;

server/thread.c

@@ -1304,7 +1304,7 @@ DECL_HANDLER(init_thread)
         process->peb      = req->entry;
         process->cpu      = req->cpu;
         reply->info_size  = init_process( current );
-        if (!process->parent)
+        if (!process->parent_id)
             process->affinity = current->affinity = get_thread_affinity( current );
         else
             set_thread_affinity( current, current->affinity );