+++ /dev/null
-/* Initialization for access to a mmap'd malloc managed region. */
-
-/* Copyright (c) 2012-2022. The SimGrid Team.
- * All rights reserved. */
-
-/* This program is free software; you can redistribute it and/or modify it
- * under the terms of the license (GNU LGPL) which comes with this package. */
-
-/* Copyright 1992, 2000 Free Software Foundation, Inc.
-
- Contributed by Fred Fish at Cygnus Support. fnf@cygnus.com
-
- This file is part of the GNU C Library.
-
- The GNU C Library is free software; you can redistribute it and/or
- modify it under the terms of the GNU Library General Public License as
- published by the Free Software Foundation; either version 2 of the
- License, or (at your option) any later version.
-
- The GNU C Library is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Library General Public License for more details.
-
- You should have received a copy of the GNU Library General Public
- License along with the GNU C Library; see the file COPYING.LIB. If
- not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA. */
-
-#include "src/internal_config.h"
-#include <sys/types.h>
-#include <fcntl.h> /* After sys/types.h, at least for dpx/2. */
-#include <sys/stat.h>
-#include <string.h>
-#include "mmprivate.h"
-
-/* Initialize access to a mmalloc managed region.
-
- The mapping is established starting at the specified address BASEADDR
- in the process address space.
-
- The provided BASEADDR should be chosen carefully in order to avoid
- bumping into existing mapped regions or future mapped regions.
-
- On success, returns a "malloc descriptor" which is used in subsequent
- calls to other mmalloc package functions. It is explicitly "void *"
- so that users of the package don't have to worry about the actual
- implementation details.
-
- On failure, returns NULL. */
-
-xbt_mheap_t xbt_mheap_new(void* baseaddr, int options)
-{
- /* NULL is not a valid baseaddr as we cannot map anything there. C'mon, user. Think! */
- if (baseaddr == NULL)
- return NULL;
-
- /* We start off with the malloc descriptor allocated on the stack, until we build it up enough to
- * call _mmalloc_mmap_morecore() to allocate the first page of the region and copy it there. Ensure that it is
- * zero'd and then initialize the fields that we know values for. */
-
- struct mdesc mtemp;
- xbt_mheap_t mdp = &mtemp;
- memset((char *) mdp, 0, sizeof(mtemp));
- strncpy(mdp->magic, MMALLOC_MAGIC, MMALLOC_MAGIC_SIZE);
- mdp->headersize = sizeof(mtemp);
- mdp->version = MMALLOC_VERSION;
- mdp->base = mdp->breakval = mdp->top = baseaddr;
- mdp->next_mdesc = NULL;
- mdp->options = options;
-
- pthread_mutex_init(&mdp->mutex, NULL);
- /* If we have not been passed a valid open file descriptor for the file
- to map to, then open /dev/zero and use that to map to. */
-
- /* Now try to map in the first page, copy the malloc descriptor structure there, and arrange to return a pointer to
- * this new copy. If the mapping fails, then close the file descriptor if it was opened by us, and arrange to return
- * a NULL. */
-
- void* mbase = mmorecore(mdp, sizeof(mtemp));
- if (mbase == NULL) {
- fprintf(stderr, "morecore failed to get some more memory!\n");
- abort();
- }
- memcpy(mbase, mdp, sizeof(mtemp));
-
- /* Add the new heap to the linked list of heaps attached by mmalloc */
- if(__mmalloc_default_mdp){
- mdp = __mmalloc_default_mdp;
- while(mdp->next_mdesc)
- mdp = mdp->next_mdesc;
-
- LOCK(mdp);
- mdp->next_mdesc = (struct mdesc *)mbase;
- UNLOCK(mdp);
- }
-
- return mbase;
-}
-
-
-
-/** Terminate access to a mmalloc managed region, but do not free its content.
- *
- * This is for example useful for the base region where ldl stores its data
- * because it leaves the place after us.
- */
-void xbt_mheap_destroy_no_free(xbt_mheap_t md)
-{
- struct mdesc *mdp = md;
-
- pthread_mutex_destroy(&mdp->mutex);
-}
-
-/** Terminate access to a mmalloc managed region by unmapping all memory pages associated with the region, and closing
- * the file descriptor if it is one that we opened.
-
- Returns NULL on success.
-
- Returns the malloc descriptor on failure, which can subsequently be used for further action, such as obtaining more
- information about the nature of the failure.
-
- Note that the malloc descriptor that we are using is currently located in region we are about to unmap, so we first
- make a local copy of it on the stack and use the copy. */
-
-void *xbt_mheap_destroy(xbt_mheap_t mdp)
-{
- if (mdp != NULL) {
- /* Remove the heap from the linked list of heaps attached by mmalloc */
- struct mdesc* mdptemp = __mmalloc_default_mdp;
- while(mdptemp->next_mdesc != mdp )
- mdptemp = mdptemp->next_mdesc;
-
- mdptemp->next_mdesc = mdp->next_mdesc;
-
- xbt_mheap_destroy_no_free(mdp);
- struct mdesc mtemp = *mdp;
-
- /* Now unmap all the pages associated with this region by asking for a
- negative increment equal to the current size of the region. */
-
- if (mmorecore(&mtemp, (char *)mtemp.base - (char *)mtemp.breakval) == NULL) {
- /* Deallocating failed. Update the original malloc descriptor with any changes */
- *mdp = mtemp;
- } else {
- mdp = NULL;
- }
- }
-
- return mdp;
-}
-
-/* Safety gap from the heap's break address.
- * Try to increase this first if you experience strange errors under valgrind. */
-#define HEAP_OFFSET (128UL<<20)
-
-static void mmalloc_fork_prepare(void)
-{
- xbt_mheap_t mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
- LOCK(mdp);
- mdp = mdp->next_mdesc;
- }
- }
-}
-
-static void mmalloc_fork_parent(void)
-{
- xbt_mheap_t mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
- UNLOCK(mdp);
- mdp = mdp->next_mdesc;
- }
- }
-}
-
-static void mmalloc_fork_child(void)
-{
- struct mdesc* mdp = NULL;
- if ((mdp =__mmalloc_default_mdp)){
- while(mdp){
- UNLOCK(mdp);
- mdp = mdp->next_mdesc;
- }
- }
-}
-
-/* Initialize the default malloc descriptor.
- *
- * There is no malloc_postexit() destroying the default mdp, because it would break ldl trying to free its memory
- */
-xbt_mheap_t mmalloc_preinit(void)
-{
- if (__mmalloc_default_mdp == NULL) {
- if (!mmalloc_pagesize)
- mmalloc_pagesize = getpagesize();
- unsigned long mask = ~((unsigned long)mmalloc_pagesize - 1);
- void *addr = (void*)(((unsigned long)sbrk(0) + HEAP_OFFSET) & mask);
- __mmalloc_default_mdp = xbt_mheap_new(addr, XBT_MHEAP_OPTION_MEMSET);
-
- // atfork mandated at least on FreeBSD, or simgrid-mc will fail to fork the verified app
- int res = pthread_atfork(mmalloc_fork_prepare, mmalloc_fork_parent, mmalloc_fork_child);
- mmalloc_assert(res == 0, "pthread_atfork() failed: return value %d", res);
- }
- mmalloc_assert(__mmalloc_default_mdp != NULL, "__mmalloc_default_mdp cannot be NULL");
-
- return __mmalloc_default_mdp;
-}
-
-// This is the underlying implementation of mmalloc_get_bytes_used_remote.
-// Is it used directly in order to evaluate the bytes used from a different
-// process.
-size_t mmalloc_get_bytes_used_remote(size_t heaplimit, const malloc_info* heapinfo)
-{
- int bytes = 0;
- for (size_t i=0; i < heaplimit; ++i){
- if (heapinfo[i].type == MMALLOC_TYPE_UNFRAGMENTED){
- if (heapinfo[i].busy_block.busy_size > 0)
- bytes += heapinfo[i].busy_block.busy_size;
- } else if (heapinfo[i].type > 0) {
- for (size_t j=0; j < (size_t) (BLOCKSIZE >> heapinfo[i].type); j++){
- if(heapinfo[i].busy_frag.frag_size[j] > 0)
- bytes += heapinfo[i].busy_frag.frag_size[j];
- }
- }
- }
- return bytes;
-}
