/* --------------------------------
* pq_putmessage - send a normal message (suppressed in COPY OUT mode)
*
* If msgtype is not '\0', it is a message type code to place before
* the message body. If msgtype is '\0', then the message has no type
* code (this is only valid in pre-3.0 protocols).
*
* len is the length of the message body data at *s. In protocol 3.0
* and later, a message length word (equal to len+4 because it counts
* itself too) is inserted by this routine.
*
* All normal messages are suppressed while old-style COPY OUT is in
* progress. (In practice only a few notice messages might get emitted
* then; dropping them is annoying, but at least they will still appear
* in the postmaster log.)
*
* We also suppress messages generated while pqcomm.c is busy. This
* avoids any possibility of messages being inserted within other
* messages. The only known trouble case arises if SIGQUIT occurs
* during a pqcomm.c routine --- quickdie() will try to send a warning
* message, and the most reasonable approach seems to be to drop it.
*
* returns 0 if OK, EOF if trouble
* --------------------------------
*/
int
pq_putmessage(char msgtype, const char *s, size_t len)
{
if (DoingCopyOut || PqCommBusy)
return 0;
PqCommBusy = true;
if (msgtype)
if (internal_putbytes(&msgtype, 1))
goto fail;
if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3)
{
uint32 n32;
n32 = htonl((uint32) (len + 4));
if (internal_putbytes((char *) &n32, 4))
goto fail;
}
if (internal_putbytes(s, len))
goto fail;
PqCommBusy = false;
return 0;
fail:
PqCommBusy = false;
return EOF;
}
/* --------------------------------
* pq_putmessage - send a normal message (suppressed in COPY OUT mode)
*
* If msgtype is not '\0', it is a message type code to place before
* the message body. If msgtype is '\0', then the message has no type
* code (this is only valid in pre-3.0 protocols).
*
* len is the length of the message body data at *s. In protocol 3.0
* and later, a message length word (equal to len+4 because it counts
* itself too) is inserted by this routine.
*
* All normal messages are suppressed while old-style COPY OUT is in
* progress. (In practice only a few notice messages might get emitted
* then; dropping them is annoying, but at least they will still appear
* in the postmaster log.)
*
* We also suppress messages generated while pqcomm.c is busy. This
* avoids any possibility of messages being inserted within other
* messages.
*
* returns 0 if OK, EOF if trouble
* --------------------------------
*/
int
pq_putmessage(char msgtype, const char *s, size_t len)
{
if (DoingCopyOut)
{
return EOF;
}
if ((Gp_role == GP_ROLE_DISPATCH || Gp_role == GP_ROLE_DISPATCHAGENT) && IsUnderPostmaster)
{
if (!pq_send_mutex_lock())
{
return EOF;
}
}
if (msgtype)
{
if (internal_putbytes(&msgtype, 1))
goto fail;
}
if (PG_PROTOCOL_MAJOR(FrontendProtocol) >= 3)
{
uint32 n32;
n32 = htonl((uint32) (len + 4));
if (internal_putbytes((char *) &n32, 4))
goto fail;
}
if (internal_putbytes(s, len))
goto fail;
if ((Gp_role == GP_ROLE_DISPATCH || Gp_role == GP_ROLE_DISPATCHAGENT) && IsUnderPostmaster)
pthread_mutex_unlock(&send_mutex);
return 0;
fail:
if ((Gp_role == GP_ROLE_DISPATCH || Gp_role == GP_ROLE_DISPATCHAGENT) && IsUnderPostmaster)
pthread_mutex_unlock(&send_mutex);
return EOF;
}
/* --------------------------------
* pq_putbytes - send bytes to connection (not flushed until pq_flush)
*
* returns 0 if OK, EOF if trouble
* --------------------------------
*/
int
pq_putbytes(const char *s, size_t len)
{
int res;
/* Should only be called by old-style COPY OUT */
Assert(DoingCopyOut);
/* No-op if reentrant call */
if (PqCommBusy)
return 0;
PqCommBusy = true;
res = internal_putbytes(s, len);
PqCommBusy = false;
return res;
}
/* --------------------------------
* pq_putbytes - send bytes to connection (not flushed until pq_flush)
*
* returns 0 if OK, EOF if trouble
* --------------------------------
*/
int
pq_putbytes(const char *s, size_t len)
{
int res;
/* Should only be called by old-style COPY OUT */
Assert(DoingCopyOut);
if (!pq_send_mutex_lock())
{
return EOF;
}
res = internal_putbytes(s, len);
pthread_mutex_unlock(&send_mutex);
return res;
}
