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Posted to c-dev@axis.apache.org by "Alex Mantaut (JIRA)" <ji...@apache.org> on 2012/08/13 21:12:38 UTC
[jira] [Commented] (AXIS2C-1551) Crash when reusing svc_client with
non-blocking call
[ https://issues.apache.org/jira/browse/AXIS2C-1551?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13433436#comment-13433436 ]
Alex Mantaut commented on AXIS2C-1551:
--------------------------------------
Perhaps the patch posted in https://issues.apache.org/jira/browse/AXIS2C-1584 fixes this bug?
> Crash when reusing svc_client with non-blocking call
> ----------------------------------------------------
>
> Key: AXIS2C-1551
> URL: https://issues.apache.org/jira/browse/AXIS2C-1551
> Project: Axis2-C
> Issue Type: Bug
> Components: core/clientapi
> Affects Versions: 1.6.0
> Environment: windows
> Reporter: Leo Wang
> Priority: Critical
> Labels: non-blocking, reuse
>
> I have an issue when I try using non-blocking axis2/c call to access a web service. Please help me.
> The pseudo code is as follow,
> Firstly, start a web request as follow,
> axis2_callback_t *callback = axis2_callback_create(env);
> axis2_callback_set_on_complete(callback, callback_on_complete);
> axis2_callback_set_on_error(callback, callback_on_error);
> axis2_svc_client_send_receive_non_blocking(svc_client, env, the_1st_request, callback);
> In callback_on_complete, I try let the same svc_client to send out the 2nd request,
> axis2_callback_t *callback = axis2_callback_create(env);
> axis2_callback_set_on_complete(callback, callback_on_complete);
> axis2_callback_set_on_error(callback, callback_on_error);
> axis2_svc_client_send_receive_non_blocking(svc_client, env, the_2nd_request, callback);
> The problem is, the 2nd non-blocking call makes the process crash.
> I debugged into the code; It seems send_receive_non_blocking puts the corresponding blocking method to thread pool, and the thread sent the request and get the response, the callback_on_complete get executed. Unfortunately, the thread doesn't exit immediately, it try to free something;
> if (args_list->callback)
> {
> axis2_callback_invoke_on_complete(args_list->callback,
> th_env,
> args_list->op_client->async_result);
>
> axis2_callback_set_complete(args_list->callback, th_env, AXIS2_TRUE);
> }
>
> /* Clean up memory */
> axis2_async_result_free(args_list->op_client->async_result, th_env);
> But the 2nd thread, started by axis2_svc_client_send_receive_non_blocking in callback_on_complete, has freed the op_client before the 1st thread tries freeing op_client->async_result.
> Please tell me how to check if one non-blocking call is completely done. I mean, the svc_client is ready for reusing or deleting. It seems callback_on_complete is not the answer.
> BTW, Why my program works this way, is because it need upload some huge data to server with SOAP/MTOM, the data has to be split into multiple packages; otherwise one failure could make the resending data cost too much.
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