Mercurial > hg > idav / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/cx/mempool.h	Sun Jan 21 16:30:18 2024 +0100
@@ -0,0 +1,149 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ *   1. Redistributions of source code must retain the above copyright
+ *      notice, this list of conditions and the following disclaimer.
+ *
+ *   2. Redistributions in binary form must reproduce the above copyright
+ *      notice, this list of conditions and the following disclaimer in the
+ *      documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+/**
+ * \file mempool.h
+ * \brief Interface for memory pool implementations.
+ * \author Mike Becker
+ * \author Olaf Wintermann
+ * \version 3.0
+ * \copyright 2-Clause BSD License
+ */
+
+#ifndef UCX_MEMPOOL_H
+#define UCX_MEMPOOL_H
+
+#include "common.h"
+#include "allocator.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/** Internal structure for pooled memory. */
+struct cx_mempool_memory_s;
+
+/**
+ * The basic structure of a memory pool.
+ * Should be the first member of an actual memory pool implementation.
+ */
+struct cx_mempool_s {
+    /** The provided allocator. */
+    CxAllocator const *allocator;
+
+    /**
+     * A destructor that shall be automatically registered for newly allocated memory.
+     * This destructor MUST NOT free the memory.
+     */
+    cx_destructor_func auto_destr;
+
+    /** Array of pooled memory. */
+    struct cx_mempool_memory_s **data;
+
+    /** Number of pooled memory items. */
+    size_t size;
+
+    /** Memory pool capacity. */
+    size_t capacity;
+};
+
+/**
+ * Common type for all memory pool implementations.
+ */
+typedef struct cx_mempool_s CxMempool;
+
+/**
+ * Creates an array-based memory pool with a shared destructor function.
+ *
+ * This destructor MUST NOT free the memory.
+ *
+ * @param capacity the initial capacity of the pool
+ * @param destr the destructor function to use for allocated memory
+ * @return the created memory pool or \c NULL if allocation failed
+ */
+__attribute__((__warn_unused_result__))
+CxMempool *cxMempoolCreate(size_t capacity, cx_destructor_func destr);
+
+/**
+ * Creates a basic array-based memory pool.
+ *
+ * @param capacity the initial capacity of the pool
+ * @return the created memory pool or \c NULL if allocation failed
+ */
+__attribute__((__warn_unused_result__))
+static inline CxMempool *cxBasicMempoolCreate(size_t capacity) {
+    return cxMempoolCreate(capacity, NULL);
+}
+
+/**
+ * Destroys a memory pool and frees the managed memory.
+ *
+ * @param pool the memory pool to destroy
+ */
+__attribute__((__nonnull__))
+void cxMempoolDestroy(CxMempool *pool);
+
+/**
+ * Sets the destructor function for a specific allocated memory object.
+ *
+ * If the memory is not managed by a UCX memory pool, the behavior is undefined.
+ * The destructor MUST NOT free the memory.
+ *
+ * @param memory the object allocated in the pool
+ * @param fnc the destructor function
+ */
+__attribute__((__nonnull__))
+void cxMempoolSetDestructor(
+        void *memory,
+        cx_destructor_func fnc
+);
+
+/**
+ * Registers foreign memory with this pool.
+ *
+ * The destructor, in contrast to memory allocated by the pool, MUST free the memory.
+ *
+ * A small portion of memory will be allocated to register the information in the pool.
+ * If that allocation fails, this function will return non-zero.
+ *
+ * @param pool the pool
+ * @param memory the object allocated in the pool
+ * @param destr the destructor function
+ * @return zero on success, non-zero on failure
+ */
+__attribute__((__nonnull__))
+int cxMempoolRegister(
+        CxMempool *pool,
+        void *memory,
+        cx_destructor_func destr
+);
+
+#ifdef __cplusplus
+} // extern "C"
+#endif
+
+#endif // UCX_MEMPOOL_H