Add ao_alarm

[fw/altos] / src / ao.h

diff --git a/src/ao.h b/src/ao.h
index 84e92f35e77ced7eb5c581c6c43230f9eabc110f..b90befe56e8921cc986176bce114bb104f5661bb 100644 (file)
--- a/src/ao.h
+++ b/src/ao.h
@@ -40,6 +40,7 @@
 /* An AltOS task */
 struct ao_task {
        __xdata void *wchan;            /* current wait channel (NULL if running) */
+       uint16_t alarm;                 /* abort ao_sleep time */
        uint8_t stack_count;            /* amount of saved stack */
        uint8_t task_id;                /* index in the task array */
        __code char *name;              /* task name */
@@ -55,8 +56,12 @@ extern __xdata struct ao_task *__data ao_cur_task;
  ao_task.c
  */
 
-/* Suspend the current task until wchan is awoken */
-void
+/* Suspend the current task until wchan is awoken.
+ * returns:
+ *  0 on normal wake
+ *  1 on alarm
+ */
+uint8_t
 ao_sleep(__xdata void *wchan);
 
 /* Wake all tasks sleeping on wchan */
@@ -67,6 +72,10 @@ ao_wakeup(__xdata void *wchan);
 void
 ao_wake_task(__xdata struct ao_task *task);
 
+/* set an alarm to go off in 'delay' ticks */
+void
+ao_alarm(uint16_t delay);
+
 /* Yield the processor to another task */
 void
 ao_yield(void) _naked;