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Belgian Amiga Club - ADF Collection
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BS1 part 26
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Aztec C v5.2a disk 2.adf
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examples.lzh
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safeclose.c
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C/C++ Source or Header
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1990-09-02
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2KB
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54 lines
/* CloseWindowSafely()
* This module should be used whenever you are sharing an IDCMP
* message port with more than one window. Rather than calling CloseWindow(),
* you should use CloseWindowSafely(). This will keep Intuition from
* Guru Meditation, and thus is considered a good thing. You should still
* use CloseWindow for the very last window you close.
* The reason this is needed, is because Intuition will re-claim
* any outstanding messages for a window when the window is closed. But...
* it can't take them out of your message port. Thus, you will receive
* invalid messages and bad things will happen. Very bad things.
* This code is a slightly condensed version of the same routine
* written by Neil Katin of Amiga for the April '86 Commodore Developers
* Newsletter, Amiga Mail (tm).
*/
/*
#include <exec/types.h>
#include <exec/nodes.h>
#include <exec/lists.h>
#include <exec/ports.h>
#include <intuition/intuition.h>
#include <functions.h>
*/
#include "standard.h"
void CloseWindowSafely( p_wind )
struct Window *p_wind;
{
register struct IntuiMessage *msg;
register struct IntuiMessage *succ;
register struct Window *win = p_wind;
register struct MsgPort *mp = (struct MsgPort *)win->UserPort;
Forbid();
msg = (struct IntuiMessage *)mp->mp_MsgList.lh_Head;
while ( succ=(struct IntuiMessage *)msg->ExecMessage.mn_Node.ln_Succ )
{
if ( msg->IDCMPWindow == win )
{
Remove ( (struct Node *)msg );
ReplyMsg( (struct Message *)msg );
}
msg = succ;
}
win->UserPort = NULL;
ModifyIDCMP( win, 0L );
Permit();
CloseWindow( win );
}