diff options
Diffstat (limited to 'core/cortex-m0/task.c')
| -rw-r--r-- | core/cortex-m0/task.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/core/cortex-m0/task.c b/core/cortex-m0/task.c index d26a82b6d2..1ab82d7d24 100644 --- a/core/cortex-m0/task.c +++ b/core/cortex-m0/task.c @@ -400,6 +400,34 @@ uint32_t task_wait_event(int timeout_us) return __wait_evt(timeout_us, TASK_ID_IDLE); } +uint32_t task_wait_event_mask(uint32_t event_mask, int timeout_us) +{ + uint64_t deadline = get_time().val + timeout_us; + uint32_t events = 0; + int time_remaining_us = timeout_us; + + /* Add the timer event to the mask so we can indicate a timeout */ + event_mask |= TASK_EVENT_TIMER; + + while (!(events & event_mask)) { + /* Collect events to re-post later */ + events |= __wait_evt(time_remaining_us, TASK_ID_IDLE); + + time_remaining_us = deadline - get_time().val; + if (timeout_us > 0 && time_remaining_us <= 0) { + /* Ensure we return a TIMER event if we timeout */ + events |= TASK_EVENT_TIMER; + break; + } + } + + /* Re-post any other events collected */ + if (events & ~event_mask) + atomic_or(¤t_task->events, events & ~event_mask); + + return events & event_mask; +} + void task_enable_irq(int irq) { CPU_NVIC_EN(0) = 1 << irq; |