Lesson 35 - Get Compute Auth Token Working

Plugins/GameLiftPlugin/Source/AWSSDK/Include/aws/common/ring_buffer.inl

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+#ifndef AWS_COMMON_RING_BUFFER_INL
+#define AWS_COMMON_RING_BUFFER_INL
+/**
+ * Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0.
+ */
+
+#include <aws/common/ring_buffer.h>
+
+AWS_EXTERN_C_BEGIN
+/*
+ * Checks whether atomic_ptr correctly points to a memory location within the bounds of the aws_ring_buffer
+ */
+AWS_STATIC_IMPL bool aws_ring_buffer_check_atomic_ptr(
+    const struct aws_ring_buffer *ring_buf,
+    const uint8_t *atomic_ptr) {
+    return ((atomic_ptr != NULL) && (atomic_ptr >= ring_buf->allocation && atomic_ptr <= ring_buf->allocation_end));
+}
+
+/**
+ * Checks whether the ring buffer is empty
+ */
+AWS_STATIC_IMPL bool aws_ring_buffer_is_empty(const struct aws_ring_buffer *ring_buf) {
+    uint8_t *head = (uint8_t *)aws_atomic_load_ptr(&ring_buf->head);
+    uint8_t *tail = (uint8_t *)aws_atomic_load_ptr(&ring_buf->tail);
+    return head == tail;
+}
+
+/**
+ * Evaluates the set of properties that define the shape of all valid aws_ring_buffer structures.
+ * It is also a cheap check, in the sense it run in constant time (i.e., no loops or recursion).
+ */
+AWS_STATIC_IMPL bool aws_ring_buffer_is_valid(const struct aws_ring_buffer *ring_buf) {
+    uint8_t *head = (uint8_t *)aws_atomic_load_ptr(&ring_buf->head);
+    uint8_t *tail = (uint8_t *)aws_atomic_load_ptr(&ring_buf->tail);
+    bool head_in_range = aws_ring_buffer_check_atomic_ptr(ring_buf, head);
+    bool tail_in_range = aws_ring_buffer_check_atomic_ptr(ring_buf, tail);
+    /* if head points-to the first element of the buffer then tail must too */
+    bool valid_head_tail = (head != ring_buf->allocation) || (tail == ring_buf->allocation);
+    return ring_buf && (ring_buf->allocation != NULL) && head_in_range && tail_in_range && valid_head_tail &&
+           (ring_buf->allocator != NULL);
+}
+AWS_EXTERN_C_END
+#endif /* AWS_COMMON_RING_BUFFER_INL */