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Process error events first

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This prevents EPOLLOUT/EPOLLIN events from triggering confusing errors if
an EPOLLERR event happens at the same time.
This commit is contained in:
Markus Mäkelä 2020-03-09 13:08:48 +02:00
parent 163a7b3b84
commit 6f018e752b
No known key found for this signature in database
GPG Key ID: 5CE746D557ACC499
1 changed files with 34 additions and 38 deletions
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72
server/core/dcb.cc
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@ -2654,44 +2654,6 @@ static uint32_t dcb_process_poll_events(DCB* dcb, uint32_t events)
* Any of these callbacks might close the DCB. Hence, the value of 'n_close'
* must be checked after each callback invocation.
*/
if ((events & EPOLLOUT) && (dcb->n_close == 0))
{
rc |= MXB_POLL_WRITE;
if (dcb_session_check(dcb, "write_ready"))
{
DCB_EH_NOTICE("Calling dcb->func.write_ready(%p)", dcb);
dcb->func.write_ready(dcb);
}
}
if ((events & EPOLLIN) && (dcb->n_close == 0))
{
MXS_DEBUG("%lu [poll_waitevents] "
"Read in dcb %p fd %d",
pthread_self(),
dcb,
dcb->fd);
rc |= MXB_POLL_READ;
if (dcb_session_check(dcb, "read"))
{
int return_code = 1;
/** SSL authentication is still going on, we need to call dcb_accept_SSL
* until it return 1 for success or -1 for error */
if (dcb->ssl_state == SSL_HANDSHAKE_REQUIRED)
{
return_code = (DCB::Role::CLIENT == dcb->role) ?
dcb_accept_SSL(dcb) :
dcb_connect_SSL(dcb);
}
if (1 == return_code)
{
DCB_EH_NOTICE("Calling dcb->func.read(%p)", dcb);
dcb->func.read(dcb);
}
}
}
if ((events & EPOLLERR) && (dcb->n_close == 0))
{
rc |= MXB_POLL_ERROR;
@ -2737,6 +2699,40 @@ static uint32_t dcb_process_poll_events(DCB* dcb, uint32_t events)
}
#endif
if ((events & EPOLLOUT) && (dcb->n_close == 0))
{
rc |= MXB_POLL_WRITE;
if (dcb_session_check(dcb, "write_ready"))
{
DCB_EH_NOTICE("Calling dcb->func.write_ready(%p)", dcb);
dcb->func.write_ready(dcb);
}
}
if ((events & EPOLLIN) && (dcb->n_close == 0))
{
rc |= MXB_POLL_READ;
if (dcb_session_check(dcb, "read"))
{
int return_code = 1;
/** SSL authentication is still going on, we need to call dcb_accept_SSL
* until it return 1 for success or -1 for error */
if (dcb->ssl_state == SSL_HANDSHAKE_REQUIRED)
{
return_code = (DCB::Role::CLIENT == dcb->role) ?
dcb_accept_SSL(dcb) :
dcb_connect_SSL(dcb);
}
if (1 == return_code)
{
DCB_EH_NOTICE("Calling dcb->func.read(%p)", dcb);
dcb->func.read(dcb);
}
}
}
return rc;
}