altos: Add AO_STACK_CANARY to detect stack overflows sometimes

[fw/altos] / src / kernel / ao_task.h

diff --git a/src/kernel/ao_task.h b/src/kernel/ao_task.h
index 9197e25cef0f6f1c828d033404227206cd75a934..27f47a5629de139565d203e34f3c63ccc21998e3 100644 (file)
--- a/src/kernel/ao_task.h
+++ b/src/kernel/ao_task.h
@@ -48,10 +48,16 @@ struct ao_task {
        struct ao_list  queue;
        struct ao_list  alarm_queue;
        /* Provide both 32-bit and 8-bit stacks */
+#ifdef AO_STACK_CANARY
+       uint32_t        bottom_canary;
+#endif
        union {
                uint32_t stack32[AO_STACK_SIZE>>2];
                uint8_t stack8[AO_STACK_SIZE];
        } AO_STACK_ALIGNMENT;
+#ifdef AO_STACK_CANARY
+       uint32_t top_canary;
+#endif
 #if HAS_SAMPLE_PROFILE
        uint32_t ticks;
        uint32_t yields;