Import of the watch repository from Pebble

tests/fakes/fake_system_task.h

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+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include "services/common/system_task.h"
+#include "fake_pebble_tasks.h"
+
+#include "util/list.h"
+
+#include "clar_asserts.h"
+
+#include <string.h>
+#include <stdint.h>
+
+typedef struct {
+  ListNode node;
+  SystemTaskEventCallback callback;
+  void *data;
+} SystemTaskCallbackNode;
+
+static ListNode *s_system_task_callback_head = NULL;
+static bool s_invoke_as_current = false;
+static uint32_t system_task_available_space = ~(uint32_t)0;
+
+bool system_task_add_callback(SystemTaskEventCallback cb, void *data) {
+  SystemTaskCallbackNode *node = (SystemTaskCallbackNode *) malloc(sizeof(SystemTaskCallbackNode));
+  cl_assert(node != NULL);
+  list_init(&node->node);
+
+  cl_assert(cb);
+  node->callback = cb;
+  node->data = data;
+
+  s_system_task_callback_head = list_prepend(s_system_task_callback_head, &node->node);
+  cl_assert(s_system_task_callback_head);
+  system_task_available_space--;
+  return true;
+}
+
+bool system_task_add_callback_from_isr(SystemTaskEventCallback cb, void *data,
+                                       bool *should_context_switch) {
+  *should_context_switch = false;
+  return system_task_add_callback(cb, data);
+}
+
+uint32_t system_task_get_available_space(void) {
+  return system_task_available_space;
+}
+
+void system_task_set_available_space(uint32_t space) {
+  system_task_available_space = space;
+}
+
+////////////////////////////////////
+// Stub:
+//
+void stub_invoke_system_task_as_current(void) {
+  s_invoke_as_current = !s_invoke_as_current;
+}
+
+////////////////////////////////////
+// Fake manipulation:
+//
+void *s_fake_system_task_current_cb;
+
+void fake_system_task_callbacks_invoke(int num_to_invoke) {
+  PebbleTask current_task = pebble_task_get_current();
+  if (!s_invoke_as_current) {
+    stub_pebble_tasks_set_current(PebbleTask_KernelBackground);
+  }
+
+  // Start at tail ("oldest" callback):
+  SystemTaskCallbackNode *node = (SystemTaskCallbackNode *) list_get_tail(s_system_task_callback_head);
+  while (node && num_to_invoke) {
+    // do callback first, in case callback enqueues more callbacks
+    if (node->callback) {
+      s_fake_system_task_current_cb = node->callback;
+      node->callback(node->data);
+      s_fake_system_task_current_cb = NULL;
+    }
+    SystemTaskCallbackNode *prev = (SystemTaskCallbackNode *) list_get_prev(&node->node);
+    list_remove(&node->node, &s_system_task_callback_head, NULL);
+    free(node);
+    node = prev;
+
+    system_task_available_space++;
+    num_to_invoke--;
+  }
+
+  stub_pebble_tasks_set_current(current_task);
+}
+
+void fake_system_task_callbacks_invoke_pending(void) {
+  // sometimes the cb's may add new jobs so we need to keep looping until no
+  // more are left
+  while (s_system_task_callback_head) {
+    fake_system_task_callbacks_invoke(list_count(s_system_task_callback_head));
+  }
+}
+
+void fake_system_task_callbacks_cleanup(void) {
+  SystemTaskCallbackNode *node = (SystemTaskCallbackNode *) s_system_task_callback_head;
+  while (node) {
+    SystemTaskCallbackNode *next = (SystemTaskCallbackNode *) list_get_next(&node->node);
+    list_remove(&node->node, &s_system_task_callback_head, NULL);
+    free(node);
+    node = next;
+  }
+  cl_assert(s_system_task_callback_head == NULL);
+}
+
+void system_task_watchdog_feed(void) {
+}
+
+uint32_t fake_system_task_count_callbacks(void) {
+  return list_count(s_system_task_callback_head);
+}
+
+void system_task_enable_raised_priority(bool is_raised) {
+}
+
+bool system_task_is_ready_to_run(void) {
+  return true;
+}
+
+void* system_task_get_current_callback(void) {
+  return s_fake_system_task_current_cb;
+}