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From: d5adria@dtek.chalmers.se. (Martin Adrian)
Newsgroups: comp.sys.amiga.tech
Subject: Semaphores
Message-ID: <1716@mathrt0.math.chalmers.se>
Date: 20 Nov 89 13:22:58 GMT
Sender: news@mathrt0.math.chalmers.se
Reply-To: d5adria@dtek.chalmers.se (Martin Adrian)
Organization: Chalmers Univ. of Technology, Gothenburg, Sweden
Lines: 40

I can't get the function AddSemaphore to work.

My program looks like this:

main()
{
  struct SignalSemaphore ss;

  /* set name and pri */

  AddSemaphore(&ss);

  ....

  RemSemaphore(&ss);
}

The guru will show up every time with different nubers.

When i disassembled the exec function AddSemaphore it looked like this(Ks1.3):
AddSemaphore:  JSR   _LVOInitSemaphore(A6)
	       LEA   SemaphoreList+LH_Head(A6),A0
	       BRA   xxxx    ;do Enqueue

When i looked up the functions in programmers guide i found that AddSemaphore
wants the Semaphorepointer in A1 and InitSemaphore in A0.
(The lattice proto/exec.h was wrong about this)

InitSemaphore also destroys A0,A1,D0,D1.

As far as i can see there is no way that this function can work.
 
 BTW this macro works fine.
#define AddSemaphore(ss) InitSemaphore(ss),\
		         Enqueue(ExecBase->SemaphoreList,&(ss)->ss_Link)
                                                                 ^ 
						   the semaphore node 
Is this a known bug in Exec ?

Martin Adrian.