🚀 go-pugleaf

In article <6287@star.cs.vu.nl> peraue@cs.vu.nl (Raue Paul Erik) writes:

peraue> Just one little problem... When I try to open the dos.library
peraue> it the machine crashes....

peraue> Can anyone send me a working program using the dos.library?

On 12 Apr 90 01:07:13 GMT, jep@mtiame.oz (Jesper Peterson) said:

Jesper> The dos.library is opened for you by the C startup code, so
Jesper> just leap straight into your dos calls.

Unless, of course, you're not linking with startup code...

Jesper> Apart from it being a bad idea, I don't know if opening a
Jesper> library twice will cause the machine to crash.

Bad idea??  Better to open the library twice than not at all.  Cause a
crash?  If it does, it's not due to opening it twice.  The entire
purpose of the runtime libraries is to be shared by various tasks, and
all OpenLibrary() (normally) does if the library is already loaded and
initialized is to update a usage count in the Library structure.

When you CloseLibrary(), this count is decremented, and the library
might also be expunged if usecount is zero and a delayed expunge was
pending.  The library doesn't care who opens it or how many times.
Apart from initialization, multiple opens are like multiple layers of
Forbid() or Disable() calls -- they nest, but have no other effect.
So, opening a library twice will NOT cause a crash, but attempting to
use a library without opening it likely WILL.  (exec.library being an
exception -- if exec.library is toast, so are you, so forget it.)

Deven
-- 
Deven T. Corzine        Internet:  deven@rpi.edu, shadow@pawl.rpi.edu
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