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Subject: Re: how to unlock locked memory
To: djgpp AT delorie DOT com
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From: "Gisle Vanem (gvanem AT yahoo DOT no) [via djgpp AT delorie DOT com]" <djgpp AT delorie DOT com>
Message-ID: <56E949FA.2070703@yahoo.no>
Date: Wed, 16 Mar 2016 12:56:42 +0100
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Wiktor S. wrote:

>> So, you should be able to use __dpmi_unlock_linear_region()
>> by passing the same address and size as they were computed
>> in either _go32_dpmi_lock_code() or _go32_dpmi_lock_data().
>> Look at the code in gopint.c to see how this is done.
> 
> Thanks. Weird that there is no _go32_dpmi_unlock_code/data.

You can use '__dpmi_unlock_linear_region()'.
Example:

#include <dpmi.h>
#include <sys/segments.h>
#define DWORD unsigned long

static void _unlock (const void *addr, DWORD size)
{
  __dpmi_meminfo mem;
  DWORD base = 0;

  __dpmi_get_segment_base_address (_my_ds(), &base);
  mem.address = base + (DWORD)addr;
  mem.size    = size;
  __dpmi_unlock_linear_region (&mem);
}
----------

AFAICR, in djgpp both DS and CS have the same base-address.
Hence you can use this to unlock both data and code. But I give
you no guarantees though... I haven't tried this in years.

-- 
--gv