use an sbrk() only malloc() because save and restore depends on saving
the data segment only. Maybe we should make libbsdmalloc?
This commit is contained in:
christos
parent
e6227d3c54
commit
dcf856aa49
@ -1,11 +1,11 @@
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# $NetBSD: Makefile,v 1.22 2002/03/05 21:30:41 thorpej Exp $
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# $NetBSD: Makefile,v 1.23 2003/04/21 01:23:07 christos Exp $
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# @(#)Makefile 8.1 (Berkeley) 5/31/93
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.include <bsd.own.mk>
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PROG= monop
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SRCS= monop.c cards.c execute.c getinp.c houses.c jail.c misc.c morg.c \
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print.c prop.c rent.c roll.c spec.c trade.c
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SRCS= monop.c cards.c execute.c getinp.c houses.c jail.c malloc.c misc.c \
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morg.c print.c prop.c rent.c roll.c spec.c trade.c
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MAN= monop.6
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HIDEGAME=hidegame
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CLEANFILES+=initdeck cards.pck
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497
games/monop/malloc.c
Normal file
497
games/monop/malloc.c
Normal file
@ -0,0 +1,497 @@
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/* $NetBSD: malloc.c,v 1.1 2003/04/21 01:23:06 christos Exp $ */
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/*
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* Copyright (c) 1983, 1993
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* The Regents of the University of California. All rights reserved.
|
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*
|
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* 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.
|
||||
* 3. All advertising materials mentioning features or use of this software
|
||||
* must display the following acknowledgement:
|
||||
* This product includes software developed by the University of
|
||||
* California, Berkeley and its contributors.
|
||||
* 4. Neither the name of the University nor the names of its contributors
|
||||
* may be used to endorse or promote products derived from this software
|
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS 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 REGENTS OR CONTRIBUTORS BE LIABLE
|
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
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* 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
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||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
||||
* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)malloc.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: malloc.c,v 1.1 2003/04/21 01:23:06 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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/*
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* malloc.c (Caltech) 2/21/82
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* Chris Kingsley, kingsley@cit-20.
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*
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* This is a very fast storage allocator. It allocates blocks of a small
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* number of different sizes, and keeps free lists of each size. Blocks that
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* don't exactly fit are passed up to the next larger size. In this
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* implementation, the available sizes are 2^n-4 (or 2^n-10) bytes long.
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* This is designed for use in a virtual memory environment.
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*/
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#include <sys/types.h>
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#if defined(DEBUG) || defined(RCHECK)
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#include <sys/uio.h>
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#endif
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#if defined(RCHECK) || defined(MSTATS)
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#include <stdio.h>
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <threadlib.h>
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/*
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* The overhead on a block is at least 4 bytes. When free, this space
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* contains a pointer to the next free block, and the bottom two bits must
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* be zero. When in use, the first byte is set to MAGIC, and the second
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* byte is the size index. The remaining bytes are for alignment.
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* If range checking is enabled then a second word holds the size of the
|
||||
* requested block, less 1, rounded up to a multiple of sizeof(RMAGIC).
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* The order of elements is critical: ov_magic must overlay the low order
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* bits of ov_next, and ov_magic can not be a valid ov_next bit pattern.
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*/
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union overhead {
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union overhead *ov_next; /* when free */
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struct {
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u_char ovu_magic; /* magic number */
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u_char ovu_index; /* bucket # */
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#ifdef RCHECK
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||||
u_short ovu_rmagic; /* range magic number */
|
||||
u_long ovu_size; /* actual block size */
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||||
#endif
|
||||
} ovu;
|
||||
#define ov_magic ovu.ovu_magic
|
||||
#define ov_index ovu.ovu_index
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||||
#define ov_rmagic ovu.ovu_rmagic
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#define ov_size ovu.ovu_size
|
||||
};
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||||
|
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#define MAGIC 0xef /* magic # on accounting info */
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#ifdef RCHECK
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#define RMAGIC 0x5555 /* magic # on range info */
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#endif
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#ifdef RCHECK
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#define RSLOP sizeof (u_short)
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#else
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#define RSLOP 0
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#endif
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|
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/*
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* nextf[i] is the pointer to the next free block of size 2^(i+3). The
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* smallest allocatable block is 8 bytes. The overhead information
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* precedes the data area returned to the user.
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*/
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#define NBUCKETS 30
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static union overhead *nextf[NBUCKETS];
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static long pagesz; /* page size */
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static int pagebucket; /* page size bucket */
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#ifdef MSTATS
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/*
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* nmalloc[i] is the difference between the number of mallocs and frees
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* for a given block size.
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*/
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static u_int nmalloc[NBUCKETS];
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#endif
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static mutex_t malloc_mutex = MUTEX_INITIALIZER;
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static void morecore __P((int));
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static int findbucket __P((union overhead *, int));
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#ifdef MSTATS
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void mstats __P((const char *));
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#endif
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#if defined(DEBUG) || defined(RCHECK)
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#define ASSERT(p) if (!(p)) botch(__STRING(p))
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static void botch __P((const char *));
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/*
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||||
* NOTE: since this may be called while malloc_mutex is locked, stdio must not
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* be used in this function.
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||||
*/
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static void
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botch(s)
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const char *s;
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{
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struct iovec iov[3];
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iov[0].iov_base = "\nassertion botched: ";
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iov[0].iov_len = 20;
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iov[1].iov_base = (void *)s;
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iov[1].iov_len = strlen(s);
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iov[2].iov_base = "\n";
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iov[2].iov_len = 1;
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/*
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||||
* This place deserves a word of warning: a cancellation point will
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* occur when executing writev(), and we might be still owning
|
||||
* malloc_mutex. At this point we need to disable cancellation
|
||||
* until `after' abort() because i) establishing a cancellation handler
|
||||
* might, depending on the implementation, result in another malloc()
|
||||
* to be executed, and ii) it is really not desirable to let execution
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* continue. `Fix me.'
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*
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* Note that holding mutex_lock during abort() is safe.
|
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*/
|
||||
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||||
(void)writev(STDERR_FILENO, iov, 3);
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abort();
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}
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#else
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#define ASSERT(p)
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||||
#endif
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void *
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malloc(nbytes)
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size_t nbytes;
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{
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union overhead *op;
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int bucket;
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long n;
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unsigned amt;
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mutex_lock(&malloc_mutex);
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/*
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* First time malloc is called, setup page size and
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* align break pointer so all data will be page aligned.
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*/
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if (pagesz == 0) {
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pagesz = n = getpagesize();
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ASSERT(pagesz > 0);
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op = (union overhead *)(void *)sbrk(0);
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n = n - sizeof (*op) - ((long)op & (n - 1));
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if (n < 0)
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n += pagesz;
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if (n) {
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if (sbrk((int)n) == (void *)-1) {
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mutex_unlock(&malloc_mutex);
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return (NULL);
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}
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}
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bucket = 0;
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amt = 8;
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while (pagesz > amt) {
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amt <<= 1;
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bucket++;
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}
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pagebucket = bucket;
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}
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/*
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* Convert amount of memory requested into closest block size
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* stored in hash buckets which satisfies request.
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* Account for space used per block for accounting.
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*/
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if (nbytes <= (n = pagesz - sizeof (*op) - RSLOP)) {
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#ifndef RCHECK
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amt = 8; /* size of first bucket */
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||||
bucket = 0;
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||||
#else
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amt = 16; /* size of first bucket */
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||||
bucket = 1;
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||||
#endif
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n = -((long)sizeof (*op) + RSLOP);
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} else {
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amt = (unsigned)pagesz;
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bucket = pagebucket;
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||||
}
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while (nbytes > amt + n) {
|
||||
amt <<= 1;
|
||||
if (amt == 0)
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||||
return (NULL);
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||||
bucket++;
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||||
}
|
||||
/*
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||||
* If nothing in hash bucket right now,
|
||||
* request more memory from the system.
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||||
*/
|
||||
if ((op = nextf[bucket]) == NULL) {
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||||
morecore(bucket);
|
||||
if ((op = nextf[bucket]) == NULL) {
|
||||
mutex_unlock(&malloc_mutex);
|
||||
return (NULL);
|
||||
}
|
||||
}
|
||||
/* remove from linked list */
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||||
nextf[bucket] = op->ov_next;
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||||
op->ov_magic = MAGIC;
|
||||
op->ov_index = bucket;
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||||
#ifdef MSTATS
|
||||
nmalloc[bucket]++;
|
||||
#endif
|
||||
mutex_unlock(&malloc_mutex);
|
||||
#ifdef RCHECK
|
||||
/*
|
||||
* Record allocated size of block and
|
||||
* bound space with magic numbers.
|
||||
*/
|
||||
op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
|
||||
op->ov_rmagic = RMAGIC;
|
||||
*(u_short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
|
||||
#endif
|
||||
return ((void *)(op + 1));
|
||||
}
|
||||
|
||||
/*
|
||||
* Allocate more memory to the indicated bucket.
|
||||
*/
|
||||
static void
|
||||
morecore(bucket)
|
||||
int bucket;
|
||||
{
|
||||
union overhead *op;
|
||||
long sz; /* size of desired block */
|
||||
long amt; /* amount to allocate */
|
||||
long nblks; /* how many blocks we get */
|
||||
|
||||
/*
|
||||
* sbrk_size <= 0 only for big, FLUFFY, requests (about
|
||||
* 2^30 bytes on a VAX, I think) or for a negative arg.
|
||||
*/
|
||||
sz = 1 << (bucket + 3);
|
||||
#ifdef DEBUG
|
||||
ASSERT(sz > 0);
|
||||
#else
|
||||
if (sz <= 0)
|
||||
return;
|
||||
#endif
|
||||
if (sz < pagesz) {
|
||||
amt = pagesz;
|
||||
nblks = amt / sz;
|
||||
} else {
|
||||
amt = sz + pagesz;
|
||||
nblks = 1;
|
||||
}
|
||||
op = (union overhead *)(void *)sbrk((int)amt);
|
||||
/* no more room! */
|
||||
if ((long)op == -1)
|
||||
return;
|
||||
/*
|
||||
* Add new memory allocated to that on
|
||||
* free list for this hash bucket.
|
||||
*/
|
||||
nextf[bucket] = op;
|
||||
while (--nblks > 0) {
|
||||
op->ov_next =
|
||||
(union overhead *)(void *)((caddr_t)(void *)op+(size_t)sz);
|
||||
op = op->ov_next;
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
free(cp)
|
||||
void *cp;
|
||||
{
|
||||
long size;
|
||||
union overhead *op;
|
||||
|
||||
if (cp == NULL)
|
||||
return;
|
||||
op = (union overhead *)(void *)((caddr_t)cp - sizeof (union overhead));
|
||||
#ifdef DEBUG
|
||||
ASSERT(op->ov_magic == MAGIC); /* make sure it was in use */
|
||||
#else
|
||||
if (op->ov_magic != MAGIC)
|
||||
return; /* sanity */
|
||||
#endif
|
||||
#ifdef RCHECK
|
||||
ASSERT(op->ov_rmagic == RMAGIC);
|
||||
ASSERT(*(u_short *)((caddr_t)(op + 1) + op->ov_size) == RMAGIC);
|
||||
#endif
|
||||
size = op->ov_index;
|
||||
ASSERT(size < NBUCKETS);
|
||||
mutex_lock(&malloc_mutex);
|
||||
op->ov_next = nextf[(unsigned int)size];/* also clobbers ov_magic */
|
||||
nextf[(unsigned int)size] = op;
|
||||
#ifdef MSTATS
|
||||
nmalloc[(size_t)size]--;
|
||||
#endif
|
||||
mutex_unlock(&malloc_mutex);
|
||||
}
|
||||
|
||||
/*
|
||||
* When a program attempts "storage compaction" as mentioned in the
|
||||
* old malloc man page, it realloc's an already freed block. Usually
|
||||
* this is the last block it freed; occasionally it might be farther
|
||||
* back. We have to search all the free lists for the block in order
|
||||
* to determine its bucket: 1st we make one pass thru the lists
|
||||
* checking only the first block in each; if that fails we search
|
||||
* ``__realloc_srchlen'' blocks in each list for a match (the variable
|
||||
* is extern so the caller can modify it). If that fails we just copy
|
||||
* however many bytes was given to realloc() and hope it's not huge.
|
||||
*/
|
||||
int __realloc_srchlen = 4; /* 4 should be plenty, -1 =>'s whole list */
|
||||
|
||||
void *
|
||||
realloc(cp, nbytes)
|
||||
void *cp;
|
||||
size_t nbytes;
|
||||
{
|
||||
u_long onb;
|
||||
long i;
|
||||
union overhead *op;
|
||||
char *res;
|
||||
int was_alloced = 0;
|
||||
|
||||
if (cp == NULL)
|
||||
return (malloc(nbytes));
|
||||
if (nbytes == 0) {
|
||||
free (cp);
|
||||
return (NULL);
|
||||
}
|
||||
op = (union overhead *)(void *)((caddr_t)cp - sizeof (union overhead));
|
||||
mutex_lock(&malloc_mutex);
|
||||
if (op->ov_magic == MAGIC) {
|
||||
was_alloced++;
|
||||
i = op->ov_index;
|
||||
} else {
|
||||
/*
|
||||
* Already free, doing "compaction".
|
||||
*
|
||||
* Search for the old block of memory on the
|
||||
* free list. First, check the most common
|
||||
* case (last element free'd), then (this failing)
|
||||
* the last ``__realloc_srchlen'' items free'd.
|
||||
* If all lookups fail, then assume the size of
|
||||
* the memory block being realloc'd is the
|
||||
* largest possible (so that all "nbytes" of new
|
||||
* memory are copied into). Note that this could cause
|
||||
* a memory fault if the old area was tiny, and the moon
|
||||
* is gibbous. However, that is very unlikely.
|
||||
*/
|
||||
if ((i = findbucket(op, 1)) < 0 &&
|
||||
(i = findbucket(op, __realloc_srchlen)) < 0)
|
||||
i = NBUCKETS;
|
||||
}
|
||||
onb = (u_long)1 << (u_long)(i + 3);
|
||||
if (onb < pagesz)
|
||||
onb -= sizeof (*op) + RSLOP;
|
||||
else
|
||||
onb += pagesz - sizeof (*op) - RSLOP;
|
||||
/* avoid the copy if same size block */
|
||||
if (was_alloced) {
|
||||
if (i) {
|
||||
i = (long)1 << (long)(i + 2);
|
||||
if (i < pagesz)
|
||||
i -= sizeof (*op) + RSLOP;
|
||||
else
|
||||
i += pagesz - sizeof (*op) - RSLOP;
|
||||
}
|
||||
if (nbytes <= onb && nbytes > i) {
|
||||
#ifdef RCHECK
|
||||
op->ov_size = (nbytes + RSLOP - 1) & ~(RSLOP - 1);
|
||||
*(u_short *)((caddr_t)(op + 1) + op->ov_size) = RMAGIC;
|
||||
#endif
|
||||
mutex_unlock(&malloc_mutex);
|
||||
return (cp);
|
||||
|
||||
}
|
||||
#ifndef _REENT
|
||||
else
|
||||
free(cp);
|
||||
#endif
|
||||
}
|
||||
mutex_unlock(&malloc_mutex);
|
||||
if ((res = malloc(nbytes)) == NULL) {
|
||||
#ifdef _REENT
|
||||
free(cp);
|
||||
#endif
|
||||
return (NULL);
|
||||
}
|
||||
#ifndef _REENT
|
||||
if (cp != res) /* common optimization if "compacting" */
|
||||
(void)memmove(res, cp, (size_t)((nbytes < onb) ? nbytes : onb));
|
||||
#else
|
||||
(void)memmove(res, cp, (size_t)((nbytes < onb) ? nbytes : onb));
|
||||
free(cp);
|
||||
#endif
|
||||
return (res);
|
||||
}
|
||||
|
||||
/*
|
||||
* Search ``srchlen'' elements of each free list for a block whose
|
||||
* header starts at ``freep''. If srchlen is -1 search the whole list.
|
||||
* Return bucket number, or -1 if not found.
|
||||
*/
|
||||
static int
|
||||
findbucket(freep, srchlen)
|
||||
union overhead *freep;
|
||||
int srchlen;
|
||||
{
|
||||
union overhead *p;
|
||||
int i, j;
|
||||
|
||||
for (i = 0; i < NBUCKETS; i++) {
|
||||
j = 0;
|
||||
for (p = nextf[i]; p && j != srchlen; p = p->ov_next) {
|
||||
if (p == freep)
|
||||
return (i);
|
||||
j++;
|
||||
}
|
||||
}
|
||||
return (-1);
|
||||
}
|
||||
|
||||
#ifdef MSTATS
|
||||
/*
|
||||
* mstats - print out statistics about malloc
|
||||
*
|
||||
* Prints two lines of numbers, one showing the length of the free list
|
||||
* for each size category, the second showing the number of mallocs -
|
||||
* frees for each size category.
|
||||
*/
|
||||
void
|
||||
mstats(s)
|
||||
char *s;
|
||||
{
|
||||
int i, j;
|
||||
union overhead *p;
|
||||
int totfree = 0,
|
||||
totused = 0;
|
||||
|
||||
fprintf(stderr, "Memory allocation statistics %s\nfree:\t", s);
|
||||
for (i = 0; i < NBUCKETS; i++) {
|
||||
for (j = 0, p = nextf[i]; p; p = p->ov_next, j++)
|
||||
;
|
||||
fprintf(stderr, " %d", j);
|
||||
totfree += j * (1 << (i + 3));
|
||||
}
|
||||
fprintf(stderr, "\nused:\t");
|
||||
for (i = 0; i < NBUCKETS; i++) {
|
||||
fprintf(stderr, " %d", nmalloc[i]);
|
||||
totused += nmalloc[i] * (1 << (i + 3));
|
||||
}
|
||||
fprintf(stderr, "\n\tTotal in use: %d, total free: %d\n",
|
||||
totused, totfree);
|
||||
}
|
||||
#endif
|
||||
Loading…
Reference in New Issue
Block a user