Diff: simple-mbed-cloud-client/mbed-cloud-client/update-client-hub/modules/atomic-queue/source/atomic.c

Revision:

0:119624335925

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simple-mbed-cloud-client/mbed-cloud-client/update-client-hub/modules/atomic-queue/source/atomic.c	Sat Jun 30 01:40:30 2018 +0000
@@ -0,0 +1,74 @@
+// ----------------------------------------------------------------------------
+// Copyright 2015-2017 ARM Ltd.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// 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.
+// ----------------------------------------------------------------------------
+
+#include <stddef.h>
+#include "atomic.h"
+
+#if defined(TARGET_LIKE_MBED)
+#include "cmsis.h"
+#endif
+
+#if !defined(__CORTEX_M) || (__CORTEX_M < 0x03)
+#include "aq_critical.h"
+
+int aq_atomic_cas_deref_uintptr(uintptr_t* volatile * ptrAddr,
+                            uintptr_t** currentPtrValue,
+                            uintptr_t expectedDerefValue,
+                            uintptr_t* newPtrValue,
+                            uintptr_t valueOffset)
+{
+    int rc;
+    aq_critical_section_enter();
+    uintptr_t *current = *ptrAddr;
+    if (currentPtrValue != NULL) {
+        *currentPtrValue = current;
+    }
+    if (current == NULL) {
+        rc = AQ_ATOMIC_CAS_DEREF_NULLPTR;
+    } else if ( *(uintptr_t *)((uintptr_t)current + valueOffset) != expectedDerefValue) {
+        rc = AQ_ATOMIC_CAS_DEREF_VALUE;
+    } else {
+        *ptrAddr = newPtrValue;
+        rc = AQ_ATOMIC_CAS_DEREF_SUCCESS;
+    }
+    aq_critical_section_exit();
+    return rc;
+}
+#endif
+
+
+#if defined(__GNUC__) && (!defined(__CORTEX_M) || (__CORTEX_M >= 0x03))
+int aq_atomic_cas_uintptr(uintptr_t *ptr, uintptr_t oldval, uintptr_t newval) {
+    return __sync_bool_compare_and_swap(ptr, oldval, newval);
+}
+#else
+int aq_atomic_cas_uintptr(uintptr_t *ptr, uintptr_t oldval, uintptr_t newval)
+{
+    int rc;
+    aq_critical_section_enter();
+    if (*ptr == oldval) {
+        rc = 1;
+        *ptr = newval;
+    } else {
+        rc = 0;
+    }
+    aq_critical_section_exit();
+    return rc;
+}
+
+#endif