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Diffstat (limited to 'ACE/docs/ACE-FMM.html')
| -rw-r--r-- | ACE/docs/ACE-FMM.html | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/ACE/docs/ACE-FMM.html b/ACE/docs/ACE-FMM.html index 0430b7b9a7d..7ab2aaeb40d 100644 --- a/ACE/docs/ACE-FMM.html +++ b/ACE/docs/ACE-FMM.html @@ -241,6 +241,53 @@ int MyHandler::handle_close (ACE_HANDLE handle, </td> <tr><td colspan=2><hr noshade></td></tr> +<tr> +<td align=right valign=top> + <b>symptom</b> +</td> +<td align=left valign=top> + Application crashes after deleting Event_Handler. +</td> +</tr> +<tr> +<td align=right valign=top> + <b>probable cause</b> +</td> +<td align=left valign=top> + You left a dangling pointer to the Event_Handler in the Reactor. + It is the application's responsibility to remove all pending notifications, + timer events and completely remove the event handler I/O registrations + before removing the event handler. + + Also, the application should remove the event handler from the reactor + <b>before</b> closing the underlying file descriptor / handle. + Otherwise: + <ul> + <li>The reactor does not know how to remove the event handler, because the + handle is used as the identifier for the event handlers</li> + <li>The file descriptor / handle may be reused by another thread, leading to + nasty race conditions.</li> + </ul> +</td> +</tr> +<tr> +<td align=right valign=top> + <b>solution</b> + <ul> + <li>Use reference counted event handlers. The reactor and the application + cooperate to remove the event handler when the last reference goes away. + </li> + <li>Remember to call <tt>purge_pending_notifications()</tt>, + <tt>remove_handler()</tt> and <tt>cancel_timer()</tt> before deleting the + event handler. + </li> + </ul> +</td> +<td align=left valign=top> + +</td> +<tr><td colspan=2><hr noshade></td></tr> + <!-- <tr> |