#include <stdlib.h>
#include <string.h>
-#define bcopy(s,d,n) memcpy ((d), (s), (n)) /* No overlap handling. */
-
#include "hurdmalloc.h" /* XXX see that file */
#include <mach.h>
#define vm_allocate __vm_allocate
#define vm_page_size __vm_page_size
-/*
+/*
* Mach Operating System
* Copyright (c) 1991,1990,1989 Carnegie Mellon University
* All Rights Reserved.
- *
+ *
* Permission to use, copy, modify and distribute this software and its
* documentation is hereby granted, provided that both the copyright
* notice and this permission notice appear in all copies of the
* software, derivative works or modified versions, and any portions
* thereof, and that both notices appear in supporting documentation.
- *
+ *
* CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
* CONDITION. CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
* ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
- *
+ *
* Carnegie Mellon requests users of this software to return to
- *
+ *
* Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
* School of Computer Science
* Carnegie Mellon University
* Pittsburgh PA 15213-3890
- *
+ *
* any improvements or extensions that they make and grant Carnegie Mellon
* the rights to redistribute these changes.
*/
/*
- * HISTORY
- * $Log$
- * Revision 1.10 1995/02/13 22:04:34 roland
- * (malloc_init): Add self reference to avoid not only the `defined but not
- * used' warning, but also to avoid GCC optimizing out the entire function
- * (!).
- *
- * Revision 1.9 1995/02/13 16:36:08 roland
- * Include string.h; #define bcopy using memcpy.
- *
- * Revision 1.8 1995/02/03 01:54:21 roland
- * Remove bogus bcopy decl.
- *
- * Revision 1.7 1995/01/26 04:22:02 roland
- * Don't include gnu-stabs.h.
- *
- * Revision 1.6 1994/12/07 19:41:26 roland
- * (vm_allocate, vm_page_size): #define these to __ names at top.
- *
- * Revision 1.5 1994/06/04 01:48:44 roland
- * entered into RCS
+ * (pre-GNU) HISTORY
*
* Revision 2.7 91/05/14 17:57:34 mrt
* Correcting copyright
- *
+ *
* Revision 2.6 91/02/14 14:20:26 mrt
* Added new Mach copyright
* [91/02/13 12:41:21 mrt]
- *
+ *
* Revision 2.5 90/11/05 14:37:33 rpd
* Added malloc_fork* code.
* [90/11/02 rwd]
- *
+ *
* Add spin_lock_t.
* [90/10/31 rwd]
- *
+ *
* Revision 2.4 90/08/07 14:31:28 rpd
* Removed RCS keyword nonsense.
- *
+ *
* Revision 2.3 90/06/02 15:14:00 rpd
* Converted to new IPC.
* [90/03/20 20:56:57 rpd]
- *
+ *
* Revision 2.2 89/12/08 19:53:59 rwd
* Removed conditionals.
* [89/10/23 rwd]
- *
+ *
* Revision 2.1 89/08/03 17:09:46 rwd
* Created.
- *
+ *
*
* 13-Sep-88 Eric Cooper (ecc) at Carnegie Mellon University
* Changed realloc() to copy min(old size, new size) bytes.
*/
\f
+#include <assert.h>
+
#include <cthreads.h>
-#include "cthread_internals.h"
+#define MCHECK
/*
* Structure of memory block header.
* When allocated, fl points to free list.
* Size of header is 4 bytes, so minimum usable block size is 8 bytes.
*/
+
+#define CHECK_BUSY 0x8a3c743e
+#define CHECK_FREE 0x66688b92
+
+#ifdef MCHECK
+
+typedef struct header {
+ long check;
+ union {
+ struct header *next;
+ struct free_list *fl;
+ } u;
+} *header_t;
+
+#define HEADER_SIZE sizeof (struct header)
+#define HEADER_NEXT(h) ((h)->u.next)
+#define HEADER_FREE(h) ((h)->u.fl)
+#define HEADER_CHECK(h) ((h)->check)
+#define MIN_SIZE 16
+#define LOG2_MIN_SIZE 4
+
+#else /* ! MCHECK */
+
typedef union header {
union header *next;
struct free_list *fl;
} *header_t;
+#define HEADER_SIZE sizeof (union header)
+#define HEADER_NEXT(h) ((h)->next)
+#define HEADER_FREE(h) ((h)->fl)
#define MIN_SIZE 8 /* minimum block size */
+#define LOG2_MIN_SIZE 3
+
+#endif /* MCHECK */
typedef struct free_list {
spin_lock_t lock; /* spin lock for mutual exclusion */
header_t head; /* head of free list for this size */
#ifdef DEBUG
int in_use; /* # mallocs - # frees */
-#endif DEBUG
+#endif /* DEBUG */
} *free_list_t;
/*
- * Free list with index i contains blocks of size 2^(i+3) including header.
- * Smallest block size is 8, with 4 bytes available to user.
- * Size argument to malloc is a signed integer for sanity checking,
- * so largest block size is 2^31.
+ * Free list with index i contains blocks of size 2 ^ (i + LOG2_MIN_SIZE)
+ * including header. Smallest block size is MIN_SIZE, with MIN_SIZE -
+ * HEADER_SIZE bytes available to user. Size argument to malloc is a signed
+ * integer for sanity checking, so largest block size is 2^31.
*/
#define NBUCKETS 29
}
static void
-more_memory(size, fl)
- int size;
- register free_list_t fl;
+more_memory(int size, free_list_t fl)
{
register int amount;
register int n;
if (size <= vm_page_size) {
amount = vm_page_size;
n = vm_page_size / size;
- /*
- * We lose vm_page_size - n*size bytes here. */
+ /* We lose vm_page_size - n*size bytes here. */
} else {
amount = size;
n = 1;
}
- MACH_CALL(vm_allocate(mach_task_self(), &where, (vm_size_t) amount, TRUE), r);
+
+ r = vm_allocate(mach_task_self(), &where, (vm_size_t) amount, TRUE);
+ assert_perror (r);
+
h = (header_t) where;
do {
- h->next = fl->head;
- fl->head = h;
- h = (header_t) ((char *) h + size);
+ HEADER_NEXT (h) = fl->head;
+#ifdef MCHECK
+ HEADER_CHECK (h) = CHECK_FREE;
+#endif
+ fl->head = h;
+ h = (header_t) ((char *) h + size);
} while (--n != 0);
}
if ((int) size < 0) /* sanity check */
return 0;
- size += sizeof(union header);
+ size += HEADER_SIZE;
/*
* Find smallest power-of-two block size
* big enough to hold requested size plus header.
/*
* Pop block from free list.
*/
- fl->head = h->next;
+ fl->head = HEADER_NEXT (h);
+
+#ifdef MCHECK
+ assert (HEADER_CHECK (h) == CHECK_FREE);
+ HEADER_CHECK (h) = CHECK_BUSY;
+#endif
+
#ifdef DEBUG
fl->in_use += 1;
-#endif DEBUG
+#endif /* DEBUG */
spin_unlock(&fl->lock);
/*
* Store free list pointer in block header
* so we can figure out where it goes
* at free() time.
*/
- h->fl = fl;
+ HEADER_FREE (h) = fl;
/*
* Return pointer past the block header.
*/
- return ((char *) h) + sizeof(union header);
+ return ((char *) h) + HEADER_SIZE;
}
/* Declaration changed to standard one for GNU. */
/*
* Find free list for block.
*/
- h = (header_t) (base - sizeof(union header));
- fl = h->fl;
+ h = (header_t) (base - HEADER_SIZE);
+
+#ifdef MCHECK
+ assert (HEADER_CHECK (h) == CHECK_BUSY);
+#endif
+
+ fl = HEADER_FREE (h);
i = fl - malloc_free_list;
/*
* Sanity checks.
* Push block on free list.
*/
spin_lock(&fl->lock);
- h->next = fl->head;
+ HEADER_NEXT (h) = fl->head;
+#ifdef MCHECK
+ HEADER_CHECK (h) = CHECK_FREE;
+#endif
fl->head = h;
#ifdef DEBUG
fl->in_use -= 1;
-#endif DEBUG
+#endif /* DEBUG */
spin_unlock(&fl->lock);
return;
}
/*
* Find size of old block.
*/
- h = (header_t) (old_base - sizeof(union header));
- fl = h->fl;
+ h = (header_t) (old_base - HEADER_SIZE);
+#ifdef MCHECK
+ assert (HEADER_CHECK (h) == CHECK_BUSY);
+#endif
+ fl = HEADER_FREE (h);
i = fl - malloc_free_list;
/*
* Sanity checks.
return 0;
}
/*
- * Free list with index i contains blocks of size 2^(i+3) including header.
+ * Free list with index i contains blocks of size
+ * 2 ^ (i + * LOG2_MIN_SIZE) including header.
*/
- old_size = (1 << (i+3)) - sizeof(union header);
+ old_size = (1 << (i + LOG2_MIN_SIZE)) - HEADER_SIZE;
+
+ if (new_size <= old_size
+ && new_size > (((old_size + HEADER_SIZE) >> 1) - HEADER_SIZE))
+ /* The new size still fits in the same block, and wouldn't fit in
+ the next smaller block! */
+ return old_base;
+
/*
* Allocate new block, copy old bytes, and free old block.
*/
new_base = malloc(new_size);
- if (new_base != 0)
- bcopy(old_base, new_base, (int) (old_size < new_size ? old_size : new_size));
- free(old_base);
+ if (new_base)
+ memcpy (new_base, old_base,
+ (int) (old_size < new_size ? old_size : new_size));
+
+ if (new_base || new_size == 0)
+ /* Free OLD_BASE, but only if the malloc didn't fail. */
+ free (old_base);
+
return new_base;
}
spin_lock(&fl->lock);
if (fl->in_use != 0 || fl->head != 0) {
total_used += fl->in_use * size;
- for (n = 0, h = fl->head; h != 0; h = h->next, n += 1)
+ for (n = 0, h = fl->head; h != 0; h = HEADER_NEXT (h), n += 1)
;
total_free += n * size;
fprintf(stderr, "%10d %10d %10d %10d\n",
fprintf(stderr, " all sizes %10d %10d %10d\n",
total_used, total_free, total_used + total_free);
}
-#endif DEBUG
+#endif /* DEBUG */
-static void malloc_fork_prepare()
+static void
+malloc_fork_prepare(void)
/*
* Prepare the malloc module for a fork by insuring that no thread is in a
* malloc critical section.
*/
{
register int i;
-
+
for (i = 0; i < NBUCKETS; i++) {
spin_lock(&malloc_free_list[i].lock);
}
}
-static void malloc_fork_parent()
+static void
+malloc_fork_parent(void)
/*
* Called in the parent process after a fork() to resume normal operation.
*/
}
}
-static void malloc_fork_child()
+static void
+malloc_fork_child(void)
/*
* Called in the child process after a fork() to resume normal operation.
*/
projects / platform / upstream / glibc.git / blobdiff