diff options
Diffstat (limited to 'winsup/cygwin/heap.cc')
| -rw-r--r-- | winsup/cygwin/heap.cc | 167 |
1 files changed, 0 insertions, 167 deletions
diff --git a/winsup/cygwin/heap.cc b/winsup/cygwin/heap.cc deleted file mode 100644 index 19ce3f8..0000000 --- a/winsup/cygwin/heap.cc +++ /dev/null @@ -1,167 +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" -#include "registry.h" -#include "cygwin_version.h" - -#define assert(x) - -static unsigned page_const; - -extern "C" size_t getpagesize (); - -#define MINHEAP_SIZE (4 * 1024 * 1024) - -/* 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->user_heap.base) - { - cygheap->user_heap.chunk = cygwin_shared->heap_chunk_size (); - while (cygheap->user_heap.chunk >= MINHEAP_SIZE) - { - /* Initialize page mask and default heap size. Preallocate a heap - * to assure contiguous memory. */ - cygheap->user_heap.ptr = cygheap->user_heap.top = - cygheap->user_heap.base = - VirtualAlloc (NULL, cygheap->user_heap.chunk, MEM_RESERVE, PAGE_NOACCESS); - if (cygheap->user_heap.base) - break; - cygheap->user_heap.chunk -= 1 * 1024 * 1024; - } - if (cygheap->user_heap.base == NULL) - api_fatal ("unable to allocate heap, heap_chunk_size %d, %E", - cygheap->user_heap.chunk); - } - else - { - DWORD chunk = cygheap->user_heap.chunk; /* allocation chunk */ - /* total size commited in parent */ - DWORD allocsize = (char *) cygheap->user_heap.top - - (char *) cygheap->user_heap.base; - /* 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; -MEMORY_BASIC_INFORMATION m; -(void) VirtualQuery (cygheap->user_heap.base, &m, sizeof (m)); - for (;;) - { - p = (char *) VirtualAlloc (cygheap->user_heap.base, reserve_size, - MEM_RESERVE, PAGE_READWRITE); - if (p) - break; - if ((reserve_size -= page_const) <= allocsize) - break; - } - if (p == NULL) -{ -system_printf ("unable to allocate heap %p, chunk %u, reserve %u, alloc %u, %E", -cygheap->user_heap.base, cygheap->user_heap.chunk, -reserve_size, allocsize); -system_printf ("base %p mem alloc base %p, state %p, size %d, %E", -cygheap->user_heap.base, m.AllocationBase, m.State, m.RegionSize); -error_start_init ("h:/gdbtest/gdb.exe < con > con"); try_to_debug (); - api_fatal ("unable to allocate heap %p, chunk %u, reserve %u, alloc %u, %E", - cygheap->user_heap.base, cygheap->user_heap.chunk, - reserve_size, allocsize); -} - if (p != cygheap->user_heap.base) - api_fatal ("heap allocated but not at %p", cygheap->user_heap.base); - if (!VirtualAlloc (cygheap->user_heap.base, allocsize, MEM_COMMIT, PAGE_READWRITE)) - api_fatal ("MEM_COMMIT failed, %E"); - } - - debug_printf ("heap base %p, heap top %p", cygheap->user_heap.base, - cygheap->user_heap.top); - 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->user_heap.ptr; /* Just wanted to find current cygheap->user_heap.ptr address */ - - newbrk = (char *) cygheap->user_heap.ptr + n; /* Where new cygheap->user_heap.ptr will be */ - newtop = (char *) pround (newbrk); /* Actual top of allocated memory - - on page boundary */ - - if (newtop == cygheap->user_heap.top) - goto good; - - if (n < 0) - { /* Freeing memory */ - assert (newtop < cygheap->user_heap.top); - n = (char *) cygheap->user_heap.top - newtop; - if (VirtualFree (newtop, n, MEM_DECOMMIT)) /* Give it back to OS */ - goto good; /* Didn't take */ - else - goto err; - } - - assert (newtop > cygheap->user_heap.top); - - /* 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->user_heap.top); - if (VirtualAlloc (cygheap->user_heap.top, 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 = cygheap->user_heap.chunk) < commitbytes) - newbrksize = commitbytes; - - if ((VirtualAlloc (cygheap->user_heap.top, newbrksize, MEM_RESERVE, PAGE_NOACCESS) != NULL) && - (VirtualAlloc (cygheap->user_heap.top, commitbytes, MEM_COMMIT, PAGE_READWRITE) != NULL)) - goto good; - -err: - set_errno (ENOMEM); - return (void *) -1; - -good: - void *oldbrk = cygheap->user_heap.ptr; - cygheap->user_heap.ptr = newbrk; - cygheap->user_heap.top = newtop; - return oldbrk; -} |