diff options
Diffstat (limited to 'winsup/cygwin/heap.cc')
| -rw-r--r-- | winsup/cygwin/heap.cc | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/winsup/cygwin/heap.cc b/winsup/cygwin/heap.cc deleted file mode 100644 index 139b1d5a0..000000000 --- a/winsup/cygwin/heap.cc +++ /dev/null @@ -1,144 +0,0 @@ -/* heap.cc: Cygwin heap manager. - - Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. - -This file is part of Cygwin. - -This software is a copyrighted work licensed under the terms of the -Cygwin license. Please consult the file "CYGWIN_LICENSE" for -details. */ - -#include "winsup.h" -#include <errno.h> -#include "cygerrno.h" -#include "sigproc.h" -#include "pinfo.h" -#include "heap.h" -#include "shared_info.h" -#include "security.h" -#include "fhandler.h" -#include "path.h" -#include "dtable.h" -#include "cygheap.h" - -#define assert(x) - -static unsigned page_const; - -extern "C" size_t getpagesize (); - -/* Initialize the heap at process start up. */ - -void -heap_init () -{ - /* If we're the forkee, we must allocate the heap at exactly the same place - as our parent. If not, we don't care where it ends up. */ - - page_const = system_info.dwPageSize; - if (cygheap->heapbase) - { - DWORD chunk = cygwin_shared->heap_chunk_size (); /* allocation chunk */ - /* total size commited in parent */ - DWORD allocsize = (char *) cygheap->heaptop - (char *) cygheap->heapbase; - /* round up by chunk size */ - DWORD reserve_size = chunk * ((allocsize + (chunk - 1)) / chunk); - - /* Loop until we've managed to reserve an adequate amount of memory. */ - char *p; - for (;;) - { - p = (char *) VirtualAlloc (cygheap->heapbase, reserve_size, - MEM_RESERVE, PAGE_READWRITE); - if (p) - break; - if ((reserve_size -= page_const) <= allocsize) - break; - } - if (p == NULL) - api_fatal ("1. unable to allocate heap %p, heap_chunk_size %d, pid %d, %E", - cygheap->heapbase, cygwin_shared->heap_chunk_size (), myself->pid); - if (p != cygheap->heapbase) - api_fatal ("heap allocated but not at %p", cygheap->heapbase); - if (! VirtualAlloc (cygheap->heapbase, allocsize, MEM_COMMIT, PAGE_READWRITE)) - api_fatal ("MEM_COMMIT failed, %E"); - } - else - { - /* Initialize page mask and default heap size. Preallocate a heap - * to assure contiguous memory. */ - cygheap->heapptr = cygheap->heaptop = cygheap->heapbase = - VirtualAlloc (NULL, cygwin_shared->heap_chunk_size (), MEM_RESERVE, - PAGE_NOACCESS); - if (cygheap->heapbase == NULL) - api_fatal ("2. unable to allocate heap, heap_chunk_size %d, %E", - cygwin_shared->heap_chunk_size ()); - } - - debug_printf ("heap base %p, heap top %p", cygheap->heapbase, - cygheap->heaptop); - page_const--; - malloc_init (); -} - -#define pround(n) (((size_t)(n) + page_const) & ~page_const) - -/* FIXME: This function no longer handles "split heaps". */ - -extern "C" void * -_sbrk (int n) -{ - sigframe thisframe (mainthread); - char *newtop, *newbrk; - unsigned commitbytes, newbrksize; - - if (n == 0) - return cygheap->heapptr; /* Just wanted to find current cygheap->heapptr address */ - - newbrk = (char *) cygheap->heapptr + n; /* Where new cygheap->heapptr will be */ - newtop = (char *) pround (newbrk); /* Actual top of allocated memory - - on page boundary */ - - if (newtop == cygheap->heaptop) - goto good; - - if (n < 0) - { /* Freeing memory */ - assert (newtop < cygheap->heaptop); - n = (char *) cygheap->heaptop - newtop; - if (VirtualFree (newtop, n, MEM_DECOMMIT)) /* Give it back to OS */ - goto good; /* Didn't take */ - else - goto err; - } - - assert (newtop > cygheap->heaptop); - - /* Need to grab more pages from the OS. If this fails it may be because - * we have used up previously reserved memory. Or, we're just plumb out - * of memory. */ - commitbytes = pround (newtop - (char *) cygheap->heaptop); - if (VirtualAlloc (cygheap->heaptop, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL) - goto good; - - /* Couldn't allocate memory. Maybe we can reserve some more. - Reserve either the maximum of the standard cygwin_shared->heap_chunk_size () or the requested - amount. Then attempt to actually allocate it. */ - - if ((newbrksize = cygwin_shared->heap_chunk_size ()) < commitbytes) - newbrksize = commitbytes; - - if ((VirtualAlloc (cygheap->heaptop, newbrksize, MEM_RESERVE, PAGE_NOACCESS) != NULL) && - (VirtualAlloc (cygheap->heaptop, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL)) - goto good; - -err: - set_errno (ENOMEM); - return (void *) -1; - -good: - void *oldbrk = cygheap->heapptr; - cygheap->heapptr = newbrk; - cygheap->heaptop = newtop; - return oldbrk; -} |