diff options
| author | Damien George <damien@micropython.org> | 2022-03-23 17:13:03 +1100 |
|---|---|---|
| committer | Damien George <damien@micropython.org> | 2022-04-14 12:31:53 +1000 |
| commit | 75506e496f7545c43c4d76bac131c4e01c258fa5 (patch) | |
| tree | cbd1c429156a780a559ece6f98e260f52a877f0b /py/runtime.c | |
| parent | d242a9b7f7b6d4e744889d5af6c17dfb54aed8c3 (diff) | |
py/scheduler: Add support for scheduling static C-based callbacks.
If MICROPY_SCHEDULER_STATIC_NODES is enabled then C code can declare a
static mp_sched_node_t and schedule a callback using
mp_sched_schedule_node(). In contrast to using mp_sched_schedule(), the
node version will have at most one pending callback outstanding, and will
always be able to schedule if there is nothing already scheduled on this
node. This guarantees that the the callback will be called exactly once
after it is scheduled.
Signed-off-by: Damien George <damien@micropython.org>
Diffstat (limited to 'py/runtime.c')
| -rw-r--r-- | py/runtime.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/py/runtime.c b/py/runtime.c index 2a07df664..02b866d83 100644 --- a/py/runtime.c +++ b/py/runtime.c @@ -65,7 +65,15 @@ void mp_init(void) { // no pending exceptions to start with MP_STATE_THREAD(mp_pending_exception) = MP_OBJ_NULL; #if MICROPY_ENABLE_SCHEDULER - MP_STATE_VM(sched_state) = MP_SCHED_IDLE; + #if MICROPY_SCHEDULER_STATIC_NODES + if (MP_STATE_VM(sched_head) == NULL) { + // no pending callbacks to start with + MP_STATE_VM(sched_state) = MP_SCHED_IDLE; + } else { + // pending callbacks are on the list, eg from before a soft reset + MP_STATE_VM(sched_state) = MP_SCHED_PENDING; + } + #endif MP_STATE_VM(sched_idx) = 0; MP_STATE_VM(sched_len) = 0; #endif |