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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2017 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdio.h>
#include "py/runtime.h"
#if MICROPY_ENABLE_SCHEDULER
// A variant of this is inlined in the VM at the pending exception check
void mp_handle_pending(void) {
if (MP_STATE_VM(sched_state) == MP_SCHED_PENDING) {
mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
if (obj != MP_OBJ_NULL) {
MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
if (!mp_sched_num_pending()) {
MP_STATE_VM(sched_state) = MP_SCHED_IDLE;
}
MICROPY_END_ATOMIC_SECTION(atomic_state);
nlr_raise(obj);
}
mp_handle_pending_tail(atomic_state);
}
}
// This function should only be called be mp_sched_handle_pending,
// or by the VM's inlined version of that function.
void mp_handle_pending_tail(mp_uint_t atomic_state) {
MP_STATE_VM(sched_state) = MP_SCHED_LOCKED;
if (MP_STATE_VM(sched_sp) > 0) {
mp_sched_item_t item = MP_STATE_VM(sched_stack)[--MP_STATE_VM(sched_sp)];
MICROPY_END_ATOMIC_SECTION(atomic_state);
mp_call_function_1_protected(item.func, item.arg);
} else {
MICROPY_END_ATOMIC_SECTION(atomic_state);
}
mp_sched_unlock();
}
void mp_sched_lock(void) {
mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
if (MP_STATE_VM(sched_state) < 0) {
--MP_STATE_VM(sched_state);
} else {
MP_STATE_VM(sched_state) = MP_SCHED_LOCKED;
}
MICROPY_END_ATOMIC_SECTION(atomic_state);
}
void mp_sched_unlock(void) {
mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
if (++MP_STATE_VM(sched_state) == 0) {
// vm became unlocked
if (MP_STATE_VM(mp_pending_exception) != MP_OBJ_NULL || mp_sched_num_pending()) {
MP_STATE_VM(sched_state) = MP_SCHED_PENDING;
} else {
MP_STATE_VM(sched_state) = MP_SCHED_IDLE;
}
}
MICROPY_END_ATOMIC_SECTION(atomic_state);
}
bool mp_sched_schedule(mp_obj_t function, mp_obj_t arg) {
mp_uint_t atomic_state = MICROPY_BEGIN_ATOMIC_SECTION();
bool ret;
if (MP_STATE_VM(sched_sp) < MICROPY_SCHEDULER_DEPTH) {
if (MP_STATE_VM(sched_state) == MP_SCHED_IDLE) {
MP_STATE_VM(sched_state) = MP_SCHED_PENDING;
}
MP_STATE_VM(sched_stack)[MP_STATE_VM(sched_sp)].func = function;
MP_STATE_VM(sched_stack)[MP_STATE_VM(sched_sp)].arg = arg;
++MP_STATE_VM(sched_sp);
ret = true;
} else {
// schedule stack is full
ret = false;
}
MICROPY_END_ATOMIC_SECTION(atomic_state);
return ret;
}
#else // MICROPY_ENABLE_SCHEDULER
// A variant of this is inlined in the VM at the pending exception check
void mp_handle_pending(void) {
if (MP_STATE_VM(mp_pending_exception) != MP_OBJ_NULL) {
mp_obj_t obj = MP_STATE_VM(mp_pending_exception);
MP_STATE_VM(mp_pending_exception) = MP_OBJ_NULL;
nlr_raise(obj);
}
}
#endif // MICROPY_ENABLE_SCHEDULER
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