From: "Trenton D. Adams" <tadams@extremeeng.com>
To: "'Jonathan Larmour'" <jlarmour@redhat.com>
Cc: "'eCos Discussion'" <ecos-discuss@sourceware.cygnus.com>
Subject: RE: [ECOS] select () confusion
Date: Thu, 02 Aug 2001 15:30:00 -0000 [thread overview]
Message-ID: <000701c11ba2$c23aa640$090110ac@TRENT> (raw)
In-Reply-To: <3B69CE88.1137051E@redhat.com>
>
> Yeah, that's because the reason it was there originally was for
> efficiency,
> and we know that's not relevant for Windows ;).
>
LMAO, I agree. But, doesn't that assume that the programmer actually
knows how to program efficiently? I mean wouldn't it be more efficient
for someone that knows what efficient is to do this internally?
> > Since FD_SET always
> > increments the fd count anyhow, I don't see a point in even using
the
> > first parameter.
>
> Eh? FD_SET doesn't change the value of the highest fd you will be
> selecting
> on, or the number of fds you have. It just sets a bit in a bitmask
(the
> fdset).
>
Oh, I was referring to the windows docs. I guess they are completely
different. I can definitely see why that would be efficient now. After
all, an fd_set in eCos is only an array of integer masks. Bit
manipulation is much faster than going through an array of SOCKETs.
eCos fd_set
typedef struct fd_set {
fd_mask fds_bits[__howmany(FD_SETSIZE, __NFDBITS)];
} fd_set;
windows fd_set (LMAO, they suck)
typedef struct fd_set {
u_int fd_count; // how many are SET?
SOCKET fd_array[FD_SETSIZE]; // an array of SOCKETs
} fd_set;
And, infact windows does increment an fdcount! :) LOL
prev parent reply other threads:[~2001-08-02 15:30 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-08-02 14:28 Trenton D. Adams
2001-08-02 14:49 ` Jonathan Larmour
2001-08-02 14:55 ` Trenton D. Adams
2001-08-02 15:05 ` Jonathan Larmour
2001-08-02 15:30 ` Trenton D. Adams [this message]
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