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Add emulation of non-blocking sockets to the win32 socket/signal layer,

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and use this in pq_getbyte_if_available.

It's only a limited implementation which swithes the whole emulation layer
no non-blocking mode, but that's enough as long as non-blocking is only
used during a short period of time, and only one socket is accessed during
this time.
This commit is contained in:
Magnus Hagander
2010-02-16 19:26:02 +00:00
parent 492eaefb90
commit 215cbc90f8
3 changed files with 40 additions and 3 deletions
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25
src/backend/port/win32/socket.c
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@ -6,13 +6,26 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/port/win32/socket.c,v 1.23 2010/01/02 16:57:50 momjian Exp $
* $PostgreSQL: pgsql/src/backend/port/win32/socket.c,v 1.24 2010/02/16 19:26:02 mha Exp $
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
/*
* Indicate if pgwin32_recv() should operate in non-blocking mode.
*
* Since the socket emulation layer always sets the actual socket to
* non-blocking mode in order to be able to deliver signals, we must
* specify this in a separate flag if we actually need non-blocking
* operation.
*
* This flag changes the behaviour *globally* for all socket operations,
* so it should only be set for very short periods of time.
*/
int pgwin32_noblock = 0;
#undef socket
#undef accept
#undef connect
@ -310,6 +323,16 @@ pgwin32_recv(SOCKET s, char *buf, int len, int f)
return -1;
}
if (pgwin32_noblock)
{
/*
* No data received, and we are in "emulated non-blocking mode", so return
* indicating thta we'd block if we were to continue.
*/
errno = EWOULDBLOCK;
return -1;
}
/* No error, zero bytes (win2000+) or error+WSAEWOULDBLOCK (<=nt4) */
for (n = 0; n < 5; n++)