[Proj] PROJ.4 thread-safety (same player shoot again)

[Patrick Mézard]

On Fri, 25 Feb 2005 09:18:33 -0500, Gerald Evenden
<gerald.evenden at verizon.net> wrote:
> To the best of my knowledge, the pj_errno is the only item to be
> modified.
> 
> There are no other globals and all "static"s refer to const's or
> procedures
> local to a file.
> 
> I would sure like to see an abstract of code that you used to handle
> the pj_errno
> condition.  Please.  Net documentation of the area is sparse.

I just declared the variable as a "thread" variable. With MSVC7.1 this
is done like :

//proj_api.h : 
__declspec(thread) extern int pj_errno;	/* global error return code */

//pj_errno.c
__declspec(thread) C_NAMESPACE int pj_errno = 0;

I have not tested it in multithreaded environment yet, but at last it
compiles and the library keeps working as before. I will notify you if
anything unexpected happens with it.

Patrick Mézard