[CLEANUP] task: distinguish between clock ticks and timers
Timers are unsigned and used as tree positions. Ticks are signed and
used as absolute date within current time frame. While the two are
normally equal (except zero), it's important not to confuse them in
the code as they are not interchangeable.
We add two inline functions to turn each one into the other.
The comments have also been moved to the proper location, as it was
not easy to understand what was a tick and what was a timer unit.
diff --git a/include/types/task.h b/include/types/task.h
index 1cc12a9..13e2aac 100644
--- a/include/types/task.h
+++ b/include/types/task.h
@@ -49,7 +49,7 @@
struct eb32_node wq; /* ebtree node used to hold the task in the wait queue */
struct eb32_node rq; /* ebtree node used to hold the task in the run queue */
int state; /* task state : bit field of TASK_* */
- unsigned int expire; /* next expiration time for this task */
+ int expire; /* next expiration date for this task, in ticks */
struct task * (*process)(struct task *t); /* the function which processes the task */
void *context; /* the task's context */
int nice; /* the task's current nice value from -1024 to +1024 */