Mercurial > hg > dav / file diff

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ucx/mempool.c	Fri Nov 30 21:18:13 2012 +0100
@@ -0,0 +1,120 @@
+/*
+ *
+ */
+
+#include <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+#include <inttypes.h>
+
+#include "mempool.h"
+
+typedef struct {
+    ucx_destructor destructor;
+    char c;
+} ucx_memchunk;
+
+typedef struct {
+    ucx_destructor destructor;
+    void           *ptr;
+} ucx_regdestr;
+
+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 == NULL) 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 == NULL) {
+        return 1;
+    } else {
+        pool->data = data; 
+        pool->size = newcap;
+        return EXIT_SUCCESS;
+    }
+}
+
+void *ucx_mempool_malloc(UcxMempool *pool, size_t n) {
+    ucx_memchunk *mem = (ucx_memchunk*)malloc(sizeof(ucx_destructor) + n);
+    if (mem == NULL) return NULL;
+
+    if (pool->ndata >= pool->size) {
+        ucx_mempool_chcap(pool, pool->size + 16);
+     }
+
+    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 == NULL) {
+        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 == NULL) return NULL;
+    if (mem != newm) {
+        for(int 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(1);
+    } else {
+        return newm + sizeof(ucx_destructor);
+    }
+}
+
+void ucx_mempool_free(UcxMempool *pool) {
+    ucx_memchunk *chunk;
+    for(int i=0;i<pool->ndata;i++) {
+        chunk = (ucx_memchunk*) pool->data[i];
+        if(chunk->destructor != NULL) {
+            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);
+}