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| From | Tim Rentsch <txr@alumni.caltech.edu> |
|---|---|
| Newsgroups | comp.lang.c |
| Subject | Re: Reference counting |
| Date | 2011-06-14 15:00 -0700 |
| Organization | A noiseless patient Spider |
| Message-ID | <kfntybsf4zu.fsf@x-alumni2.alumni.caltech.edu> (permalink) |
| References | <4deb6008$0$28457$703f8584@textnews.kpn.nl> <e9ef06c1-e30d-4953-8f15-d72b2bdde0eb@k17g2000vbn.googlegroups.com> <isulh0$ipq$1@dont-email.me> |
James Kuyper <jameskuyper@verizon.net> writes:
> On 06/10/2011 02:30 PM, ImpalerCore wrote:
> ...
>> One option is to abstract the reference count out of the structure and
>> piggyback it onto a raw allocated pointer. The same trick used to
>> make debugging allocators could apply to a reference counted pointer.
>> I've never done it before, but it's something to ponder. Here's my
>> first pass.
>>
>> \code snippet
>> #define PTR_HEADER_SIZE (sizeof (int))
>>
>> void* rc_malloc( size_t size )
>> {
>> void* mem = NULL;
>> void* p = NULL;
>>
>> p = malloc( size + PTR_HEADER_SIZE );
>>
>> if ( p )
>> {
>> /* Set the reference count to 1. */
>> *((int*)p) = 1;
>>
>> mem = (unsigned char*)p + PTR_HEADER_SIZE;
>> }
>>
>> return mem;
>> }
>
> The value stored in 'p' is guaranteed to be correctly aligned for all
> types. However, the only thing portably guaranteed about alignment off
> the value stored in 'mem' is that it is suitable for 'int', it need not
> be suitably aligned for any type with a size greater than 1 that is
> different from that of 'int'. [snip]
Unless one considers the type 'unsigned int' to be a type
different from that of 'int'.
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Reference counting daknok <radekslupik@gmail.com> - 2011-06-05 12:52 +0200
Re: Reference counting Angel <angel+news@spamcop.net> - 2011-06-05 11:17 +0000
Re: Reference counting Gene <gene.ressler@gmail.com> - 2011-06-06 20:07 -0700
Multiple Inheritance (Was Re: Reference counting) Shao Miller <sha0.miller@gmail.com> - 2011-06-11 03:57 -0500
Re: Multiple Inheritance (Was Re: Reference counting) Dr Nick <3-nospam@temporary-address.org.uk> - 2011-06-12 07:22 +0100
Re: Reference counting China Blue Angels <chine.bleu@yahoo.com> - 2011-06-05 05:07 -0700
Re: Reference counting "BartC" <bc@freeuk.com> - 2011-06-05 13:14 +0100
Re: Reference counting daknok <daknok@example.com> - 2011-06-05 14:22 +0200
Re: Reference counting "BartC" <bc@freeuk.com> - 2011-06-05 14:45 +0100
Re: Reference counting daknok <daknok@example.com> - 2011-06-05 17:01 +0200
Re: Reference counting Eric Sosman <esosman@ieee-dot-org.invalid> - 2011-06-05 18:06 -0400
Re: Reference counting Dr Nick <3-nospam@temporary-address.org.uk> - 2011-06-12 07:25 +0100
Re: Reference counting daknok <daknok@example.com> - 2011-06-05 15:29 +0200
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-05 12:17 -0500
Re: Reference counting cri@tiac.net (Richard Harter) - 2011-06-05 17:11 +0000
Re: Reference counting ImpalerCore <jadill33@gmail.com> - 2011-06-10 11:30 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-10 16:04 -0400
Re: Reference counting James Kuyper <jameskuyper@verizon.net> - 2011-06-10 22:56 -0400
Re: Reference counting ImpalerCore <jadill33@gmail.com> - 2011-06-11 12:36 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-11 17:23 -0500
Re: Reference counting luser- -droog <mijoryx@yahoo.com> - 2011-06-12 15:15 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-12 21:13 -0500
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-13 12:37 -0700
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-13 12:54 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-13 16:40 -0500
Re: Reference counting ImpalerCore <jadill33@gmail.com> - 2011-06-13 07:34 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-13 14:26 -0500
Re: Reference counting ImpalerCore <jadill33@gmail.com> - 2011-06-13 12:47 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-13 17:33 -0500
Re: Reference counting ImpalerCore <jadill33@gmail.com> - 2011-06-14 12:14 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-15 02:16 -0500
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-15 15:34 -0700
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-15 15:42 -0700
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-16 13:45 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-16 17:02 -0500
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-16 15:18 -0700
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-16 16:01 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-16 18:44 -0500
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-16 17:11 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-16 18:39 -0500
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-11 16:51 -0700
Re: Reference counting "Chris M. Thomasson" <cristom@charter.net> - 2011-06-11 18:28 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-12 16:10 -0500
Re: Reference counting ImpalerCore <jadill33@gmail.com> - 2011-06-13 07:36 -0700
Re: Reference counting Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-14 15:00 -0700
Re: Reference counting luser- -droog <mijoryx@yahoo.com> - 2011-06-13 21:46 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-14 03:19 -0500
Re: Reference counting Angel <angel+news@spamcop.net> - 2011-06-14 07:31 +0000
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-14 05:02 -0500
Re: Reference counting Keith Thompson <kst-u@mib.org> - 2011-06-14 09:03 -0700
Re: Reference counting luser- -droog <mijoryx@yahoo.com> - 2011-06-14 10:23 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-14 13:46 -0500
Re: Reference counting Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-14 15:05 -0700
Re: Reference counting Keith Thompson <kst-u@mib.org> - 2011-06-14 16:44 -0700
Re: Reference counting Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-15 06:54 -0700
Re: Reference counting Keith Thompson <kst-u@mib.org> - 2011-06-15 08:46 -0700
Re: Reference counting pete <pfiland@mindspring.com> - 2011-06-15 22:19 -0400
Re: Reference counting James Kuyper <jameskuyper@verizon.net> - 2011-06-15 23:03 -0400
Re: Reference counting Tim Rentsch <txr@alumni.caltech.edu> - 2011-06-19 14:48 -0700
Re: Reference counting Seebs <usenet-nospam@seebs.net> - 2011-06-14 17:16 +0000
Re: Reference counting luser- -droog <mijoryx@yahoo.com> - 2011-06-14 20:53 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-16 18:49 -0500
Re: Reference counting "io_x" <a@b.c.invalid> - 2011-06-14 08:30 +0200
Re: Reference counting "io_x" <a@b.c.invalid> - 2011-06-14 09:15 +0200
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-14 04:21 -0500
Re: Reference counting "io_x" <a@b.c.invalid> - 2011-06-16 10:35 +0200
Re: Reference counting Ian Collins <ian-news@hotmail.com> - 2011-06-16 20:36 +1200
Re: Reference counting "io_x" <a@b.c.invalid> - 2011-06-16 11:21 +0200
Re: Reference counting "io_x" <a@b.c.invalid> - 2011-06-19 17:57 +0200
Re: Reference counting "io_x" <a@b.c.invalid> - 2011-06-19 20:01 +0200
Re: Reference counting Keith Thompson <kst-u@mib.org> - 2011-06-19 11:07 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-19 23:15 -0500
Re: Reference counting "io_x" <a@b.c.invalid> - 2011-06-20 08:21 +0200
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-16 19:05 -0500
Re: Reference counting Ian Collins <ian-news@hotmail.com> - 2011-06-17 12:09 +1200
Re: Reference counting luser- -droog <mijoryx@yahoo.com> - 2011-06-15 08:40 -0700
Re: Reference counting "christian.bau" <christian.bau@cbau.wanadoo.co.uk> - 2011-06-16 11:08 -0700
Re: Reference counting Shao Miller <sha0.miller@gmail.com> - 2011-06-16 14:42 -0400
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