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Article View: comp.std.c
Article #1226

Re: Implementation of semaphores in "c"

#1226
From: 28-Aug-1992 1129
Date: Fri, 28 Aug 1992 02:33
47 lines
1864 bytes
NOTICE TO NEW STUDENTS:  Newsgroup comp.std.c is for discussions of
standardization issues (e.g. ISO/ANSI C standard, maybe POSIX C standard,
whether various implementations conform, whether various programs are
strictly conforming, etc.).

In article <1992Aug27.114420.20501@cam.compserv.utas.edu.au> kleung@esk.compserv.utas.edu.au (Kam  Leung) writes:
>#include <stdio.h>
>#include <sys/types.h>

ISO C doesn't have <sys/types.h>

>#define N              6
>int  s[N], me;
>enum status {nthinking,vhungry,neating} ;
>enum status p[N];
>main()
>{
>  int i, ;

ISO C doesn't allow an empty declarator (after your comma).

>  void  PHILOSOPHER(),
>        think(), eat(), hungry();
>  me = 1;    /* initial open state of main semaphore */
>  for (i=1;i<N;i++) /*initialise 1-5 philosophers to thinking*/
>      { s[i] = 0; p[i] = nthinking;}  /* private semaphore s[i]=0,close*/
>  for (i=1; i<N; i++){
>       if (fork() == 0) PHILOSOPHER(i);

ISO C doesn't have fork().

>  }
>        ..
>        ..
>  kill(0,9);

ISO C doesn't have kill().

>}

If the above answers don't help you, then perhaps you need to ask the
tutors for your course.  If they can't help you, then perhaps you need
to post in a newsgroup concerning the UNIX operating system, to learn
why separate processes have separate data spaces.
--
Norman Diamond       diamond@jit081.enet.dec.com
If this were the company's opinion, I wouldn't be allowed to post it.
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From: diamond@jit081.enet.dec.com (28-Aug-1992 1129)
Newsgroups: comp.std.c
Subject: Re: Implementation of semaphores in "c"
Message-ID: <9208280233.AA23354@enet-gw.pa.dec.com>
Date: 28 Aug 92 02:33:55 GMT
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