--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/mempool.c Sat Dec 07 12:14:59 2013 +0100
@@ -0,0 +1,204 @@
+/*
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
+ *
+ * Copyright 2013 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.
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#ifdef __cplusplus
+#define __STDC_FORMAT_MACROS
+#endif
+#include <inttypes.h>
+
+#include "mempool.h"
+
+/** Capsule for destructible memory chunks. */
+typedef struct {
+ /** The destructor for the memory chunk. */
+ ucx_destructor destructor;
+ /**
+ * First byte of the memory chunk.
+ * Note, that the address <code>&c</code> is also the address
+ * of the whole memory chunk.
+ */
+ char c;
+} ucx_memchunk;
+
+/** Capsule for data and its destructor. */
+typedef struct {
+ /** The destructor for the data. */
+ ucx_destructor destructor;
+ /** A pointer to the data. */
+ void *ptr;
+} ucx_regdestr;
+
+UCX_EXTERN void ucx_mempool_shared_destr(void* ptr) {
+ ucx_regdestr *rd = (ucx_regdestr*)ptr;
+ rd->destructor(rd->ptr);
+}
+
+UcxMempool *ucx_mempool_new(size_t n) {
+ UcxMempool *pool = (UcxMempool*)malloc(sizeof(UcxMempool));
+ if (!pool) {
+ return NULL;
+ }
+
+ pool->data = (void**) malloc(n * sizeof(void*));
+ if (pool->data == NULL) {
+ free(pool);
+ return NULL;
+ }
+
+ pool->ndata = 0;
+ pool->size = n;
+ return pool;
+}
+
+int ucx_mempool_chcap(UcxMempool *pool, size_t newcap) {
+ void **data = (void**) realloc(pool->data, newcap*sizeof(void*));
+ if (data) {
+ pool->data = data;
+ pool->size = newcap;
+ return EXIT_SUCCESS;
+ } else {
+ return EXIT_FAILURE;
+ }
+}
+
+void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
+ if (pool->ndata >= pool->size) {
+ // The hard coded 16 is documented for this function and ucx_mempool_new
+ if (ucx_mempool_chcap(pool, pool->size + 16) == EXIT_FAILURE) {
+ return NULL;
+ }
+ }
+
+ ucx_memchunk *mem = (ucx_memchunk*)malloc(sizeof(ucx_destructor) + n);
+ if (!mem) {
+ return NULL;
+ }
+
+ mem->destructor = NULL;
+ pool->data[pool->ndata] = mem;
+ pool->ndata++;
+
+ return &(mem->c);
+}
+
+void *ucx_mempool_calloc(UcxMempool *pool, size_t nelem, size_t elsize) {
+ void *ptr = ucx_mempool_malloc(pool, nelem*elsize);
+ if (!ptr) {
+ return NULL;
+ }
+ memset(ptr, 0, nelem * elsize);
+ return ptr;
+}
+
+void *ucx_mempool_realloc(UcxMempool *pool, void *ptr, size_t n) {
+ char *mem = ((char*)ptr) - sizeof(ucx_destructor);
+ char *newm = (char*) realloc(mem, n + sizeof(ucx_destructor));
+ if (!newm) {
+ return NULL;
+ }
+ if (mem != newm) {
+ for(size_t i=0 ; i < pool->ndata ; i++) {
+ if(pool->data[i] == mem) {
+ pool->data[i] = newm;
+ return newm + sizeof(ucx_destructor);
+ }
+ }
+ fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
+ (intptr_t)ptr, (intptr_t)pool);
+ exit(EXIT_FAILURE);
+ } else {
+ return newm + sizeof(ucx_destructor);
+ }
+}
+
+void ucx_mempool_free(UcxMempool *pool, void *ptr) {
+ ucx_memchunk *chunk = (ucx_memchunk*)((char*)ptr-sizeof(ucx_destructor));
+ for(size_t i=0 ; i<pool->ndata ; i++) {
+ if(chunk == pool->data[i]) {
+ if(chunk->destructor != NULL) {
+ chunk->destructor(&(chunk->c));
+ }
+ free(chunk);
+ size_t last_index = pool->ndata - 1;
+ if(i != last_index) {
+ pool->data[i] = pool->data[last_index];
+ pool->data[last_index] = NULL;
+ }
+ pool->ndata--;
+ return;
+ }
+ }
+ fprintf(stderr, "FATAL: 0x%08" PRIxPTR" not in mpool 0x%08" PRIxPTR"\n",
+ (intptr_t)ptr, (intptr_t)pool);
+ exit(EXIT_FAILURE);
+}
+
+void ucx_mempool_destroy(UcxMempool *pool) {
+ ucx_memchunk *chunk;
+ for(size_t i=0 ; i<pool->ndata ; i++) {
+ chunk = (ucx_memchunk*) pool->data[i];
+ if(chunk) {
+ if(chunk->destructor) {
+ chunk->destructor(&(chunk->c));
+ }
+ free(chunk);
+ }
+ }
+ free(pool->data);
+ free(pool);
+}
+
+void ucx_mempool_set_destr(void *ptr, ucx_destructor func) {
+ *(ucx_destructor*)((char*)ptr-sizeof(ucx_destructor)) = func;
+}
+
+void ucx_mempool_reg_destr(UcxMempool *pool, void *ptr, ucx_destructor destr) {
+ ucx_regdestr *rd = (ucx_regdestr*)ucx_mempool_malloc(
+ pool,
+ sizeof(ucx_regdestr));
+ rd->destructor = destr;
+ rd->ptr = ptr;
+ ucx_mempool_set_destr(rd, ucx_mempool_shared_destr);
+}
+
+UcxAllocator* ucx_mempool_allocator(UcxMempool *pool) {
+ UcxAllocator *allocator = (UcxAllocator*)ucx_mempool_malloc(
+ pool, sizeof(UcxAllocator));
+ if(!allocator) {
+ return NULL;
+ }
+ allocator->malloc = (ucx_allocator_malloc)ucx_mempool_malloc;
+ allocator->calloc = (ucx_allocator_calloc)ucx_mempool_calloc;
+ allocator->realloc = (ucx_allocator_realloc)ucx_mempool_realloc;
+ allocator->free = (ucx_allocator_free)ucx_mempool_free;
+ allocator->pool = pool;
+ return allocator;
+}