It is possible to define a Task in RTX like an "extern"?

Ok it was a misunderstanding I wanted to put several tasks in several files so its not a task in many pieces.... Its a good Idea to make calling to external fonctions but I wanted to know if I can make that directly, so thanks for the answer.....

Ok it was a misunderstanding I wanted to put several tasks in several files so its not a task in many pieces.... Its a good Idea to make calling to external fonctions but I wanted to know if I can make that directly, so thanks for the answer.....

I think I'm going to make calls to external functions

This builds just fine:
main.c

#include <RTL.h>

extern __task void task2 (void);
OS_TID id2;

__task void task1 (void) {
  id2 = os_tsk_create (task2, 1);
  for (;;) {
    os_evt_set (0x0004, id2);
    os_dly_wait (5);
  }
}
int main (void) {
  os_sys_init (task1);
}

external.c

#include <RTL.h>
__task void task2 (void) {
  for (;;) {
    os_evt_wait_or (0x0004, 0xffff);
  }
}

Thanks I can see my error now.. I've had a preprocesor symbol "RTX_KERNEL" not defined so It was for that that it wasn't working...

#ifdef RTX_KERNEL

/* Forward references */ __task void init (void); __task void tick_timer (void); __task void tache_display(void); __task void tache_spi (void); __task void send_data (void); __task void send_data2 (void); __task void send_data3 (void); extern __task void flash_table (void);
#endif

You can use uVision internal RTX switch instead of your own:

#ifdef __RTX
 // Options for Target - Operating system - RTX Kernel
#else
 // Options for Target - Operating system - None
#endif