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-Name   : SocketWatch
-Purpose: Asynchronous socket operations without null polls
-Version: 0.07  (11-01-2019)
-Status : GNU GPL
-Authors: Dickon Hood, Frank de Bruijn
-
-This isn't an official release.
-
-In November 2003 I noticed SocketWatch 0.04y had a couple of bugs. After I had
-corrected them and was almost ready to release 0.05, I discovered the
-'official' place for SocketWatch was now on the Nettle site
-(http://nettle.sourceforge.net). So I contacted the Nettle maintainers, told
-them about the bugs and sent them all the work I had done on repairing it,
-more or less expecting to hear something about an official release 0.05 within
-a couple of months...
-
-Still nothing three months later, so I sent one more e-mail (which remained
-unanswered) and put 0.05 on my site.
-
-
-Installing
-==========
-The zip archive contains an application called !ModInst. Run it to install the
-module on your computer. If you want to install the module manually, you can
-find it in !ModInst.Resources.!System.310.Modules.Network.
-
-
-Source
-======
-The source code is provided as an ObjAsm file in the Source directory in the
-archive. If you want to assemble the module again, run the Build file. The
-module will be recreated and moved to the !ModInst application for
-installation.
-
-
-Version history
-===============
-11-01-2019  0.07
-----------------
-Catered for errors in SocketWatch_Register better.
-Added notes about use with AcornSSL.
-
-12-06-2012
-----------
-Removed dependency on private library (providing constants) so the source can
-be used stand alone. Added Build script (previous builds were done from
-StrongED, using a multipurpose ObjAsmRun script). Nothing changed otherwise.
-MD5 checksum still f2bb3f8d911d0b20a43d6ee135c3ae97.
-
-23-06-2006  0.06
-----------------
-Fixed small bug in the AtomicReset SWI (flags not restored in 26 bit mode, so
-IRQ bit not cleared). Not sure if this ever bothered anyone (think not as it
-was already present in 0.04y).
-Removed disabling interrupts in EventHandler as event handlers are entered
-with interrupts disabled.
-Also some more source clean ups and more comments added.
-MD5 checksum: f2bb3f8d911d0b20a43d6ee135c3ae97.
-
-14-08-2005
-----------------
-Moved the source to ObjAsm. No functional changes to the code. MD5 checksum
-still 90f3323981a0e287f488e9a59b2e5373. No new release.
-
-12-12-2003  0.05
-----------------
-First one by me. Came about when I was investigating a memory leak on my RPC.
-MD5 checksum of the module: 90f3323981a0e287f488e9a59b2e5373.
-
-The detailed list of changes below was for the benefit of the Nettle
-maintainers and originally sent to Ian in an e-mail on 11-12-2003.
-Use the single file source of 0.04y as a reference.
-
-- Most of the variable definitions from Flags% to r12End% aren't required. You
-  just need SockList% (with a FNdb(-4) instead of a FNdb(4)) and r12End%. The
-  rest was removed.
-- No flag definitions are needed. Removed.
-- Socket structure definitions and ErrorChunk%: no changes.
-- From the module header to EventHandler_GotOne32%: merely some optimisations.
-- Error texts: were placed near the routines that use them. This was mainly
-  cosmetic, but it had the added advantage of allowing me to replace all the
-  FNADRLs with simple ADRs.
-- GetBlock%: removed.
-- ReleaseBlock%: removed.
-- IsHexNum_lp1%: not required. Removed.
-- moveBytes%: not required. Removed.
-- From title string to SWI-handler: no real changes.
-- From Command% to CommandText%: moved the table and the help and syntax texts
-  for the commands to just before the SWDL_Code% routine and 'cleaned up' the
-  texts a bit, but that qualifies as cosmetic.
-- Syslog_Name%: not required. Removed.
-- Syslog_Version%: not required. Removed.
-- From Init% to FinalCode%: several changes, the most important one being the
-  removal of the claiming of a 16K block of temporary workspace which was
-  neither used nor released.
-  There's also the stacking of r7 to r9/r11. It's true that these registers
-  should be saved (according to the PRM) but only if they're modified. So why
-  bother if they're not? Replacing this with just stacking r14 enabled a
-  'cleaner' jump out of the routines on errors.
-  At the very beginning of Init%, I inserted a check for a value in r12 on
-  entry. This has to do with re-initialisation after a 'Tidy' operation. Not
-  sure if that's still required though (hasn't the 'Tidy' functionality been
-  blocked or removed from RISC OS these days or is that an unfounded rumour?).
-  I removed everything connected with the CRC-check, including the error text.
-  SocketWatch is the only module I've ever come across using something like
-  this and I honestly fail to see what use it is here. But if you do see that,
-  then by all means leave it in.
-  In Final% the (unused) ModuleDying% flag was set, but as that had been
-  removed anyway, so were the three instructions involved in this action.
-  Actually, as the variable Flags% was re-used to point at the module flags
-  word, this flag bit isn't set in the first word of the workspace at all. In
-  fact, on finalisation SocketWatch 0.04y sets bit 1 of the word 592 bytes
-  from the address r12 happens to point at. That *could* be in the unused 16K
-  block that was claimed on initialisation, but there's no guarantee. Nasty
-  (and no, I hadn't realised this yet when I wrote the comment on Flags% in
-  the Source_004y file...).
-  FinalCode% (renamed release%) was more or less integrated with Init% (sort
-  of 'glued to the bottom') but otherwise essentially unchanged, apart from
-  removing the call to ReleaseBlock% (including the stacking/unstacking of
-  r14) in favour of a simple MOV r0,#7 / SWI XOS_Module sequence).
-- SWI_Register% contained some code at the start (up to the Bvs instruction) I
-  couldn't make sense of. If you can, please enlighten me. I asked Dickon
-  about this in my first email to him and he didn't understand it anymore
-  either. So I removed it.
-  The rest is essentially unchanged (cosmetics only), but I did replace the
-  call to GetBlock% and the 'push' and 'pop' instructions around it with the
-  MOV/SWI instructions that were actually required here.
-- SWI_Deregister%: no changes except for replacing the call to ReleaseBlock%
-  and its surrounding 'push'/'pop' with the necessary MOV and SWI.
-- SWI_AtomicReset%: optimisations only.
-- SWI_AllocPW%: no changes.
-- SWI_DeallocPW%: no changes.
-- SWDL_Code%: cosmetic changes only.
-
-02-12-2002  0.04y
------------------
-By Dickon Hood. See the !ReadMe file.