Article View: comp.std.c
Article #849volatile
From: Dale R. Worley
Date: Thu, 26 Oct 1989 04:13
Date: Thu, 26 Oct 1989 04:13
12 lines
1112 bytes
1112 bytes
In article <1989Oct25.020542.13354@cc.Columbia.NCR.COM> haug@cc.Columbia.NCR.COM writes: I understand the usage of volatile to indicate that a value may change for reasons that are not necesarily apparent (hardware registers, interrupts, etc) and so must be read from memory each time they are referenced. My question is: must the value be written each time it is assigned[?] Yes. I remember seeing a statement in the draft standard that both reads and writes to a volatile l-value must be as in the "abstract machine". Dale drw@math.mit.edu
Technical Details
Message-ID:
<DRW.89Oct26001311@fibonacci.math.mit.edu>Path:
arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!tut.cis.ohio-state.edu!bloom-beacon!math.mit.edu!drwReferences:
<1989Oct25.020542.13354@cc.Columbia.NCR.COM>Show Full Headers
Complete Article Headers
Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!cs.utexas.edu!tut.cis.ohio-state.edu!bloom-beacon!math.mit.edu!drw From: drw@fibonacci.math.mit.edu (Dale R. Worley) Newsgroups: comp.std.c Subject: volatile Message-ID: <DRW.89Oct26001311@fibonacci.math.mit.edu> Date: 26 Oct 89 04:13:11 GMT References: <1989Oct25.020542.13354@cc.Columbia.NCR.COM> Sender: root@bloom-beacon.MIT.EDU Organization: MIT Dept. of Mathematics, Cambridge, MA, USA Lines: 12 In-reply-to: haug@cc.Columbia.NCR.COM's message of 25 Oct 89 02:05:42 GMT