From: pfay@acl.lanl.gov (Patrick J. Fay) Subject: Re: Initialising gnuwin DLLs 30 Jan 1998 03:02:18 -0800 Message-ID: References: <199801281358.NAA07920@magpie.rpms.ac.uk> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII To: Matthew Brett Cc: gnu-win32@cygnus.com, juerg.tschirren@isbe.ch, r_urbin1@ridgecrest.ca.us, tvoverbe@wk.estec.esa.nl Hello Matthew, I'm just guessing but it sounds like you are running into things that are not thread-safe. You can allow on one thread into a code section at a time with: #include #include CRITICAL_SECTION cs; int main() { int i; InitializeCriticalSection (&cs); EnterCriticalSection (&cs); printf("hello\n"); LeaveCriticalSection (&cs); DeleteCriticalSection (&cs); return 0; } My guess is that, say, thread 1's printf calls malloc while another thread is in malloc. What happens? who knows. Pat On Wed, 28 Jan 1998, Matthew Brett wrote: > Dear All, > > >From some recent messages, it looks as though several of us are having > difficulty using gnuwin DLLs with other software (such as VC++, matlab). > Even something as innocent as a printf() command in the DLL causes > a memory access crash, with errors like: > > The instruction at 0x1000c4ec referenced memory at 0x00000058 > > It's the same with many other functions: any file access function, malloc, > pid, to name a random selection. However, although malloc() causes a > crash, LocalAlloc does not. I / we were wondering whether this was a DLL > initialisation problem, and whether anyone knows how to initialise a > gnuwin DLL properly for use by non-gnuwin apps. > > Thanks for any help to the lost, > > Matthew Brett > > - > For help on using this list (especially unsubscribing), send a message to > "gnu-win32-request@cygnus.com" with one line of text: "help". > Patrick Fay, Ph.D., Intel Corp. email: pfay@co.intel.com Los Alamos National Lab wk: (505) 665-9141 CTI M.S. B296 fax: (505) 667-5921 Los Alamos NM 87545 ASCI-RED http://www.acl.lanl.gov/~pfay/teraflop - For help on using this list (especially unsubscribing), send a message to "gnu-win32-request@cygnus.com" with one line of text: "help".