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https://issues.apache.org/jira/browse/TS-4487?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bryan Call updated TS-4487:
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Summary: Haven't check the change of lock after return from wbe callback
(was: haven't check the change of lock after return from wbe callback)
> Haven't check the change of lock after return from wbe callback
> ---------------------------------------------------------------
>
> Key: TS-4487
> URL: https://issues.apache.org/jira/browse/TS-4487
> Project: Traffic Server
> Issue Type: Improvement
> Components: SSL
> Reporter: Oknet Xu
> Assignee: Oknet Xu
> Fix For: 7.0.0
>
>
> the code:
> {code}
> int64_t r = vc->load_buffer_and_write(towrite, wattempted, total_written,
> buf, needs);
> {code}
> At the end of write_to_net_io,
> {code}
> if (!buf.reader()->read_avail()) { // should check needs==0
> write_disable(nh, vc);
> return;
> }
> if ((needs & EVENTIO_WRITE) == EVENTIO_WRITE) {
> write_reschedule(nh, vc);
> }
> if ((needs & EVENTIO_READ) == EVENTIO_READ) {
> read_reschedule(nh, vc);
> }
> return;
> {code}
> another issue in write_to_net_io(): did not check the change of lock at the
> return callback with wbe.
> {code}
> if (s->vio.ntodo() <= 0) {
> write_signal_done(VC_EVENT_WRITE_COMPLETE, nh, vc);
> return;
> } else if (signalled && (wbe_event != vc->write_buffer_empty_event)) {
> // @a signalled means we won't send an event, and the event values
> differing means we
> // had a write buffer trap and cleared it, so we need to send it now.
> if (write_signal_and_update(wbe_event, vc) != EVENT_CONT)
> return;
> // ============> did not check the change of lock at the return callback
> with wbe.
> } else if (!signalled) {
> if (write_signal_and_update(VC_EVENT_WRITE_READY, vc) != EVENT_CONT) {
> return;
> }
> // change of lock... don't look at shared variables!
> if (lock.get_mutex() != s->vio.mutex.get()) {
> write_reschedule(nh, vc);
> return;
> }
> }
> {code}
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