diff -r 000000000000 -r 1f419bd32da1 ucx/mempool.c --- /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 +#include +#include +#ifdef __cplusplus +#define __STDC_FORMAT_MACROS +#endif +#include + +#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 &c 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 ; indata ; 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 ; indata ; 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; +}