add circuitpython code

1 files changed, 51 insertions, 0 deletions

diff --git a/circuitpython/supervisor/shared/lock.c b/circuitpython/supervisor/shared/lock.c
new file mode 100644
index 0000000..36971ba
--- /dev/null
+++ b/circuitpython/supervisor/shared/lock.c
@@ -0,0 +1,51 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2021 Dan Halbert for Adafruit Industries
+ *
+ * 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 "shared-bindings/microcontroller/__init__.h"
+#include "supervisor/shared/lock.h"
+
+void supervisor_acquire_lock(supervisor_lock_t *lock) {
+    while (!supervisor_try_lock(lock)) {
+        RUN_BACKGROUND_TASKS;
+    }
+}
+
+bool supervisor_try_lock(supervisor_lock_t *lock) {
+    bool grabbed_lock = false;
+    common_hal_mcu_disable_interrupts();
+    if (!*lock) {
+        *lock = true;
+        grabbed_lock = true;
+    }
+    common_hal_mcu_enable_interrupts();
+    return grabbed_lock;
+}
+
+void supervisor_release_lock(supervisor_lock_t *lock) {
+    common_hal_mcu_disable_interrupts();
+    *lock = false;
+    common_hal_mcu_enable_interrupts();
+}