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| | REXXSEM is an OS/2-native DLL which allows [[REXX]] scripts access to native OS/2 semaphoring APIs. A few other goodies are thrown in which can greatly simplify your REXX code in a number of other areas. Over and above the simple API calls that OS/2 allows (all of which are available through RXSem), RXSem will keep track of your semaphores for you, allowing you to query RXSem for which semaphores you have in use for your given process. |
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| ==Description==
| | RXSem is also developer-friendly with a unique capability for returning error messages that describe the current problem instead of aborting your script, as is normal for REXX libraries. Finally, a few other goodies are thrown in which can greatly simplify your REXX code in a number of other areas (priority settings, process detection and killing, launching Netscape via DDE, word wrap, set window title). |
| REXXSEM is an OS/2-native DLL which allows REXX scripts (programs?) access to native OS/2 semaphoring APIs. A few other goodies are thrown in which can greatly simplify your REXX code in a number of other areas.
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| ====What is RXSem?====
| | Note that this program was developed before [[REXXUTIL]] supported semaphores, that version of REXXUTIL comes with all variants of OS/2 Warp. While this DLL has some more fine-grained control in some respects than what REXXUTIL offers, you should look into the latter functions first since they are effectively built into the OS. |
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| RXSem, at the basest level, is a DLL that provides your REXX scripts with access to the OS/2 semaphore APIs. Look at this library from a higher perspective, however, and you can see an OS/2 semaphore management subsystem. Over and above the simple API calls that OS/2 allows (all of which are available through RXSem), RXSem will keep track of your semaphores for you, allowing you to query RXSem for which semaphores you have in use for your given process.
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| RXSem is also developer-friendly with a unique capability for returning error messages that describe the current problem instead of aborting your script, as is normal for REXX libraries.
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| Finally, a few other goodies are thrown in which can greatly simplify your REXX code in a number of other areas (priority settings, process detection and killing, launching Netscape via DDE, word wrap, set window title).
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| ====Change History====
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| Changes to the library:
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| <PRE>
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| December 10, 2000 (1.05)
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| ! Fixed a few other glaring problems in trace points
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| + Added docs on SemTraceFile. Basically, only use it if I ask you to.
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| + Added more trace points to find the problem above.
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| December 9, 2000
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| ! Fixed WordWrap - it overwrote its own memory if used repeatedly.
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| August 27, 2000 (1.04)
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| + Finished adding trace points (well, unless new specific problems arise that
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| aren't covered here...)
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| August 18, 2000
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| ! Docs for RxSemListWindows had wrong function name!
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| + Added SemTraceFile - tracing for some functions enabled, will be doing more
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| as time progresses.
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| August 10, 2000
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| ! Fixed more memory leaks, and other miscellaneous well-hidden bugs.
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| July 26, 2000
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| + Added an icon - anyone else have a better one?
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| July 22, 2000 (1.03)
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| + Added RxSemWindowList and RxSemToggleSwitchVisibility
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| July 14, 2000
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| ! Fixed a memory leak when setting REXX variables
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| + Started using LXLite to compress the DLL. Chopped over 30% off its
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| size.
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| April 30, 2000
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| ! Reference (HTML) didn't have SemEWait in its TOC... woops. Found
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| this while looking it up for help using it myself.
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| February 23, 2000 (1.02)
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| + Added SetTextScreenSize so I wouldn't need to create another process
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| to run 'mode'.
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| August 19, 1999 (1.01)
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| + Added POSTONE and AUTORESET to SemECreate, under advice from
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| Scott E. Garfinkle <seg@austin.rr.com>.
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| July 28, 1999 (1.00)
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| + Added SemMQuerySemHandle, SemEQuerySemHandle, indirect request from
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| Daniel Hellesretin <danielh@crosslink.net>
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| ! Claiming a mutex with a wait of zero waited forever, as if no
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| wait was specified. (Reported by Daniel Hellesretin
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| <danielh@crosslink.net>.)
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| July 7, 1999
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| + Added ChecksumFile
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| June 24, 1999
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| + Added MyProcessID and ChecksumString
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| June 20, 1999
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| + Added registration codes so that I can pull this software out
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| of beta (finally!). Available on Hobbes. Semaphores are not
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| limited, only the extra miscellaneous functions, except for
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| opening Netscape windows.
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| June 16, 1999
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| + Very late at night, added KillProcess. (See the reference to
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| see what I mean.)
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| June 13, 1999
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| + Added PriorityQuery and PrioritySet
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| June 6, 1999 (0.7b)
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| + Added *GetAllSems because it was only about 12 lines of code,
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| and could be of some use to some people. This also returns back
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| the *name* of the semaphores.
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| * Changed the reference to .htm (I'm still FAT-compliant).
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| + Added everything to new website: http://tower.to.org/rexxsem
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| + Finished (and even debugged) event semaphores.
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| May 16, 1999
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| ! Rewrote (this is too common of a word here ...) the semaphore
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| interface. All mutex-semaphore functions (16- and 32-bit) have
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| been renamed to SemM* from Sem*. This, so that I can add Event
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| semaphores as SemE*.
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| + Started work on Event semaphores, something intended back in 1998,
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| but only started now 'cuz someone almost requested it.
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| * Changed dates in this file to be Y2K compliant. Now the entire
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| product is Y2K compiant, not just the code. :-)
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| + Added SemMCreate which will determine if you want a 32-bit or
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| 16-bit semaphore based on the semaphore name - whether it starts
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| with "\SEM32\" or "\SEM\".
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| Sep 04, 1998
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| + Created RxWinSetTitle.
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| + SemLogState changed to not create an empty file if there is
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| nothing to log. This will let you leave your 'debug' code in
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| even when nothing goes wrong.
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| Jun 22, 1998 (0.6b)
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| ! Something changed - first SemCreate wasn't working, next SemClose
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| wasn't working (as advertised anyway). Cleaned these up! Boy
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| am *I* glad I said this was BETA!
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| + Created SemVersion to return the version info. Returns
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| "REXXSEM v<version>". Starts at "REXXSEM v0.6b".
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| Jun 21, 1998
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| + Added explicit licencing information to the documentation after
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| request for same from Matthew Davis <prs@twave.net>
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| May 31, 1998 (0.5b)
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| * Rewrote to use VAC++ rather than Watcom partly because I no longer
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| have Watcom installed, but do have IBM's Visual Age installed. I
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| hope not to have to remove VAC++ anytime soon...
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| + Added language-independence. Can use other languages if someone
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| is willing to translate for me. This is the creation of
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| SemSetLanguageDll. Will ship languages in the archive as they
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| are created.
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| + Added OpenNetscapeWindow, ProcessIDsOf, WordWrap.
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| * Renamed REXXSEM.TXT to REXXSEM.REF since it was really a
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| reference file. Created new TXT file as an overview
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| description.
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| Mar 23, 1997
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| ! Changing the interface broke it. Would display wrong string
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| when had to wait for semaphore. Now displays correct string.
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| Mar 05, 1997 (0.4b)
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| * Changed the interface to SemClaim to make a bit more sense.
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| Mar 02, 1997
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| + Added optional message parameter to SemClaim. This simplifies any
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| user-friendly rexx coding immensely. This is what happens when...
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| * Author finally started using his own code. :-) Got tired of having
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| to code (in rexx) all the user-friendly stuff the same way, so I
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| cheated - I put it into the rexx code. :-)
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| Jan 19, 1997
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| + Added SemCloseAll to simplify closing all semaphores.
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| Jan 9, 1997 (0.2b)
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| ! SemClaim returned the wrong values when using a timeout. Fixed.
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| (Reported indirectly by Tony Koker <74105.1432@CompuServe.COM>)
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| * SemClaim would "lock" if attempting to claim a second time. Now
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| it simply returns "CLAIMED". This is to prevent a lock in otherwise
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| invalid behaviour (you should not claim an already-claimed semaphore)
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| (Reported by Tony Koker <74105.1432@CompuServe.COM>)
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| * SemRelease probably returned invalid values if releasing a non-claimed
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| semaphore, or releasing an already-released semaphore. Don't know
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| what it did, but it will always return successfully now in these
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| cases. However, again, you should only be releasing semaphores that
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| are already claimed. (Reported indirectly by
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| Tony Koker <74105.1432@CompuServe.COM>)
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| </PRE>
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| ==Version== | | ==Version== |
| * Latest Version: December 10, 2000. Version 1.05. | | * 1.05 (2000-12-10) |
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| ==Links== | | ==License== |
| * http://www.bmtmicro.com/BMTCatalog/os2/rxsem.html
| | Darin McBride gave authorization to release RXSem (REXXSEM) as unsupported "AS IS" freeware. The source code and key generator of this program got lost. He gave permission to hack their binaries. |
| * http://ftp2.bmtmicro.com/rxsem105.zip
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| * http://web.archive.org/web/20080828211203/http://tower.to.org/software.html
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| | | Author: [[Darin McBride]] |
| ==License==
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| Darin McBride gave authorization to release RXSem (REXXSEM) as unsupported "AS IS" freeware. The source code and key generator of this program got lost. | |
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| ==Related Articles== | | ==Related Articles== |
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| * [[REXXSEM:The Reference]] | | * [[REXXSEM:The Reference]] |
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| ==Author== | | ==Links== |
| * [[Darin McBride]] | | * http://ftp2.bmtmicro.com/rxsem105.zip |
| | * http://web.archive.org/web/20080828211203/http://tower.to.org/software.html |
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| [[Category:Tools]] | | [[Category:REXX Function Library]] |
REXXSEM is an OS/2-native DLL which allows REXX scripts access to native OS/2 semaphoring APIs. A few other goodies are thrown in which can greatly simplify your REXX code in a number of other areas. Over and above the simple API calls that OS/2 allows (all of which are available through RXSem), RXSem will keep track of your semaphores for you, allowing you to query RXSem for which semaphores you have in use for your given process.
RXSem is also developer-friendly with a unique capability for returning error messages that describe the current problem instead of aborting your script, as is normal for REXX libraries. Finally, a few other goodies are thrown in which can greatly simplify your REXX code in a number of other areas (priority settings, process detection and killing, launching Netscape via DDE, word wrap, set window title).
Note that this program was developed before REXXUTIL supported semaphores, that version of REXXUTIL comes with all variants of OS/2 Warp. While this DLL has some more fine-grained control in some respects than what REXXUTIL offers, you should look into the latter functions first since they are effectively built into the OS.
Version
License
Darin McBride gave authorization to release RXSem (REXXSEM) as unsupported "AS IS" freeware. The source code and key generator of this program got lost. He gave permission to hack their binaries.
Author: Darin McBride
Related Articles
Links