test/library/pertaskvalue.h

   1 /*
   2  * This is a test for global values in code and shared libraries.
   3  * This has several requirements:
   4  * - When porting code ofter including AROS/Amiga include must be avoided to
   5  *   not generate conflicts with possible own definitions. Therefor in this
   6  *   file not other include files will be included.
   7  * - On other systems it is possible that a shared library defines a global
   8  *   variable and this global variable can then be accessed both from other
   9  *   shared libraries and from the program.
  10  *   This is tested by defining pertaskvalue in pertask.library and
  11  *   accessing it both from userel.library and userel test program.
  12  *   One imperfection it that it is not yet supported that programs just
  13  *   define pertaskvalue as a global variable without including the .h file.
  14  * - It is avoided to call a function of pertask.library to achieve this.
  15  *   A good compiler that has good link time optimizations can than optimize
  16  *   the access to the global very well.
  17  */
  18
  19 /*
  20 Mimic following definition:
  21 int pertaskvalue;
  22 */
  23 int *__pertask_getvalueptr(void);
  24 #define pertaskvalue (*__pertask_getvalueptr())