diff options
Diffstat (limited to 'os')
| -rw-r--r-- | os/xalloc.c | 810 |
1 files changed, 810 insertions, 0 deletions
diff --git a/os/xalloc.c b/os/xalloc.c new file mode 100644 index 000000000..b42d91cd2 --- /dev/null +++ b/os/xalloc.c @@ -0,0 +1,810 @@ +#define FATALERRORS 1 +/* +Copyright (C) 1995 Pascal Haible. All Rights Reserved. + +Permission is hereby granted, free of charge, to any person obtaining a +copy of this software and associated documentation files (the "Software"), +to deal in the Software without restriction, including without limitation +the rights to use, copy, modify, merge, publish, distribute, sublicense, +and/or sell copies of the Software, and to permit persons to whom the +Software is furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL +PASCAL HAIBLE BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, +WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF +OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE +SOFTWARE. + +Except as contained in this notice, the name of Pascal Haible shall +not be used in advertising or otherwise to promote the sale, use or other +dealings in this Software without prior written authorization from +Pascal Haible. +*/ + +/* $XFree86: xc/programs/Xserver/os/xalloc.c,v 3.33 2002/04/04 14:05:57 eich Exp $ */ + +/* Only used if INTERNAL_MALLOC is defined + * - otherwise xalloc() in utils.c is used + */ +#ifdef INTERNAL_MALLOC + +#include <stdlib.h> /* for malloc() etc. */ + +#include "Xos.h" +#include "misc.h" +#include "X.h" + +#ifdef XALLOC_LOG +#include <stdio.h> +#endif + +extern Bool Must_have_memory; + +/* + ***** New malloc approach for the X server ***** + * Pascal Haible 1995 + * + * Some statistics about memory allocation of the X server + * The test session included several clients of different size, including + * xv, emacs and xpaint with a new canvas of 3000x2000, zoom 5. + * All clients were running together. + * A protocolling version of Xalloc recorded 318917 allocating actions + * (191573 Xalloc, 85942 XNFalloc, 41438 Xrealloc, 279727 Xfree). + * Results grouped by size, excluding the next lower size + * (i.e. size=32 means 16<size<=32): + * + * size nr of alloc max nr of blocks allocated together + * 8 1114 287 + * 16 17341 4104 + * 32 147352 2068 + * 64 59053 2518 + * 128 46882 1230 + * 256 20544 1217 + * 512 6808 117 + * 1024 8254 171 + * 2048 4841 287 + * 4096 2429 84 + * 8192 3364 85 + * 16384 573 22 + * 32768 49 7 + * 65536 45 5 + * 131072 48 2 + * 262144 209 2 + * 524288 7 4 + * 1048576 2 1 + * 8388608 2 2 + * + * The most used sizes: + * count size + * 24 136267 + * 40 37055 + * 72 17278 + * 56 13504 + * 80 9372 + * 16 8966 + * 32 8411 + * 136 8399 + * 104 7690 + * 12 7630 + * 120 5512 + * 88 4634 + * 152 3062 + * 52 2881 + * 48 2736 + * 156 1569 + * 168 1487 + * 160 1483 + * 28 1446 + * 1608 1379 + * 184 1305 + * 552 1270 + * 64 934 + * 320 891 + * 8 754 + * + * Conclusions: more than the half of all allocations are <= 32 bytes. + * But of these about 150,000 blocks, only a maximum of about 6,000 are + * allocated together (including memory leaks..). + * On the other side, only 935 of the 191573 or 0.5% were larger than 8kB + * (362 or 0.2% larger than 16k). + * + * What makes the server really grow is the fragmentation of the heap, + * and the fact that it can't shrink. + * To cure this, we do the following: + * - large blocks (>=11k) are mmapped on xalloc, and unmapped on xfree, + * so we don't need any free lists etc. + * As this needs 2 system calls, we only do this for the quite + * infrequent large (>=11k) blocks. + * - instead of reinventing the wheel, we use system malloc for medium + * sized blocks (>256, <11k). + * - for small blocks (<=256) we use an other approach: + * As we need many small blocks, and most ones for a short time, + * we don't go through the system malloc: + * for each fixed sizes a seperate list of free blocks is kept. + * to KISS (Keep it Small and Simple), we don't free them + * (not freeing a block of 32 bytes won't be worse than having fragmented + * a larger area on allocation). + * This way, we (almost) allways have a fitting free block right at hand, + * and don't have to walk any lists. + */ + +/* + * structure layout of a allocated block + * unsigned long size: + * rounded up netto size for small and medium blocks + * brutto size == mmap'ed area for large blocks + * unsigned long DEBUG ? MAGIC : unused + * .... data + * ( unsigned long MAGIC2 ) only if SIZE_TAIL defined + * + */ + +/* use otherwise unused long in the header to store a magic */ +/* shouldn't this be removed for production release ? */ +#define XALLOC_DEBUG + +#ifdef XALLOC_DEBUG +/* Xfree fills the memory with a certain pattern (currently 0xF0) */ +/* this should really be removed for production release! */ +#define XFREE_ERASES +#endif + +/* this must be a multiple of SIZE_STEPS below */ +#define MAX_SMALL 264 /* quite many blocks of 264 */ + +#define MIN_LARGE (11*1024) +/* worst case is 25% loss with a page size of 4k */ + +/* SIZE_STEPS defines the granularity of size of small blocks - + * this makes blocks align to that, too! */ +#define SIZE_STEPS (sizeof(double)) +#define SIZE_HEADER (2*sizeof(long)) /* = sizeof(double) for 32bit */ +#ifdef XALLOC_DEBUG +#if defined(__sparc__) +#define SIZE_TAIL (2*sizeof(long)) /* = sizeof(double) for 32bit */ +#else +#define SIZE_TAIL (sizeof(long)) +#endif +#endif + +#undef TAIL_SIZE +#ifdef SIZE_TAIL +#define TAIL_SIZE SIZE_TAIL +#else +#define TAIL_SIZE 0 +#endif + +#if defined(__alpha__) || defined(__alpha) || \ + defined(__ia64__) || defined(ia64) || \ + defined(__sparc64__) || \ + defined(__s390x__) || \ + defined(__x86_64__) || defined(x86_64) +#define MAGIC 0x1404196414071968 +#define MAGIC_FREE 0x1506196615061966 +#define MAGIC2 0x2515207525182079 +#else +#define MAGIC 0x14071968 +#define MAGIC_FREE 0x15061966 +#define MAGIC2 0x25182079 +#endif + +/* To get some statistics about memory allocation */ + +#ifdef XALLOC_LOG +#define XALLOC_LOG_FILE "/tmp/Xalloc.log" /* unsecure... */ +#define LOG_BODY(_body) \ + { FILE *f; \ + f = fopen(XALLOC_LOG_FILE, "a"); \ + if (NULL!=f) { \ + _body; \ + fclose(f); \ + } \ + } +#if defined(linux) && defined(i386) +#define LOG_ALLOC(_fun, _size, _ret) \ + { unsigned long *from; \ + __asm__("movl %%ebp,%0" : /*OUT*/ "=r" (from) : /*IN*/ ); \ + LOG_BODY(fprintf(f, "%s\t%i\t%p\t[%lu]\n", _fun, _size, _ret, *(from+1))) \ + } +#else +#define LOG_ALLOC(_fun, _size, _ret) \ + LOG_BODY(fprintf(f, "%s\t%i\t%p\n", _fun, _size, _ret)) +#endif +#define LOG_REALLOC(_fun, _ptr, _size, _ret) \ + LOG_BODY(fprintf(f, "%s\t%p\t%i\t%p\n", _fun, _ptr, _size, _ret)) +#define LOG_FREE(_fun, _ptr) \ + LOG_BODY(fprintf(f, "%s\t%p\n", _fun, _ptr)) +#else +#define LOG_ALLOC(_fun, _size, _ret) +#define LOG_REALLOC(_fun, _ptr, _size, _ret) +#define LOG_FREE(_fun, _ptr) +#endif /* XALLOC_LOG */ + +static unsigned long *free_lists[MAX_SMALL/SIZE_STEPS]; + +/* + * systems that support it should define HAS_MMAP_ANON or MMAP_DEV_ZERO + * and include the appropriate header files for + * mmap(), munmap(), PROT_READ, PROT_WRITE, MAP_PRIVATE, + * PAGE_SIZE or _SC_PAGESIZE (and MAP_ANON for HAS_MMAP_ANON). + * + * systems that don't support MAP_ANON fall through to the 2 fold behaviour + */ + +#if defined(linux) +#define HAS_MMAP_ANON +#include <sys/types.h> +#include <sys/mman.h> +#include <asm/page.h> /* PAGE_SIZE */ +#define HAS_SC_PAGESIZE /* _SC_PAGESIZE may be an enum for Linux */ +#define HAS_GETPAGESIZE +#endif /* linux */ + +#if defined(__GNU__) +#define HAS_MMAP_ANON +#include <sys/types.h> +#include <sys/mman.h> +#include <mach/vm_param.h> /* PAGE_SIZE */ +#define HAS_SC_PAGESIZE +#define HAS_GETPAGESIZE +#endif /* __GNU__ */ + +#if defined(CSRG_BASED) +#define HAS_MMAP_ANON +#define HAS_GETPAGESIZE +#include <sys/types.h> +#include <sys/mman.h> +#endif /* CSRG_BASED */ + +#if defined(DGUX) +#define HAS_GETPAGESIZE +#define MMAP_DEV_ZERO +#include <sys/types.h> +#include <sys/mman.h> +#include <unistd.h> +#endif /* DGUX */ + +#if defined(SVR4) && !defined(DGUX) +#define MMAP_DEV_ZERO +#include <sys/types.h> +#include <sys/mman.h> +#include <unistd.h> +#endif /* SVR4 && !DGUX */ + +#if defined(sun) && !defined(SVR4) /* SunOS */ +#define MMAP_DEV_ZERO /* doesn't SunOS have MAP_ANON ?? */ +#define HAS_GETPAGESIZE +#include <sys/types.h> +#include <sys/mman.h> +#endif /* sun && !SVR4 */ + +#ifdef XNO_SYSCONF +#undef _SC_PAGESIZE +#endif + +#if defined(HAS_MMAP_ANON) || defined (MMAP_DEV_ZERO) +static int pagesize; +#endif + +#ifdef MMAP_DEV_ZERO +static int devzerofd = -1; +#include <errno.h> +#endif + +/* + * empty trap function for gdb. Breakpoint here + * to find who tries to free a free area + */ +void XfreeTrap(void) +{ +} + +void * +Xalloc (unsigned long amount) +{ + register unsigned long *ptr; + int indx; + + /* sanity checks */ + + /* zero size requested */ + if (amount == 0) { + LOG_ALLOC("Xalloc=0", amount, 0); + return NULL; + } + /* negative size (or size > 2GB) - what do we do? */ + if ((long)amount < 0) { + /* Diagnostic */ +#ifdef FATALERRORS + FatalError("Xalloc: Xalloc(<0)\n"); +#else + ErrorF("Xalloc warning: Xalloc(<0) ignored..\n"); +#endif + LOG_ALLOC("Xalloc<0", amount, 0); + return NULL; + } + + /* alignment check */ +#if defined(__alpha__) || defined(__alpha) || \ + defined(__sparc__) || \ + defined(__mips__) || \ + defined(__powerpc__) || \ + defined(__arm32__) || \ + defined(__ia64__) || defined(ia64) || \ + defined(__s390x__) || defined(__s390__) + amount = (amount + (sizeof(long)-1)) & ~(sizeof(long)-1); +#endif + + if (amount <= MAX_SMALL) { + /* + * small block + */ + /* pick a ready to use small chunk */ + indx = (amount-1) / SIZE_STEPS; + ptr = free_lists[indx]; + if (NULL == ptr) { + /* list empty - get 20 or 40 more */ + /* amount = size rounded up */ + amount = (indx+1) * SIZE_STEPS; + ptr = (unsigned long *)calloc(1,(amount+SIZE_HEADER+TAIL_SIZE) + * (amount<100 ? 40 : 20)); + if (NULL!=ptr) { + int i; + unsigned long *p1, *p2; + p1 = 0; + p2 = (unsigned long *)((char *)ptr + SIZE_HEADER); + for (i=0; i<(amount<100 ? 40 : 20); i++) { + p1 = p2; + p1[-2] = amount; +#ifdef XALLOC_DEBUG + p1[-1] = MAGIC_FREE; +#endif /* XALLOC_DEBUG */ +#ifdef SIZE_TAIL + *(unsigned long *)((unsigned char *)p1 + amount) = MAGIC2; +#endif /* SIZE_TAIL */ + p2 = (unsigned long *)((char *)p1 + SIZE_HEADER + amount + TAIL_SIZE); + *(unsigned long **)p1 = p2; + } + /* last one has no next one */ + *(unsigned long **)p1 = NULL; + /* put the second in the list */ + free_lists[indx] = (unsigned long *)((char *)ptr + SIZE_HEADER + amount + TAIL_SIZE + SIZE_HEADER); + /* take the fist one */ + ptr = (unsigned long *)((char *)ptr + SIZE_HEADER); + LOG_ALLOC("Xalloc-S", amount, ptr); + ptr[-1] = MAGIC; + return (void *)ptr; + } /* else fall through to 'Out of memory' */ + } else { + /* take that piece of mem out of the list */ + free_lists[indx] = *((unsigned long **)ptr); + /* already has size (and evtl. magic) filled in */ +#ifdef XALLOC_DEBUG + ptr[-1] = MAGIC; +#endif /* XALLOC_DEBUG */ + LOG_ALLOC("Xalloc-S", amount, ptr); + return (void *)ptr; + } + +#if defined(HAS_MMAP_ANON) || defined(MMAP_DEV_ZERO) + } else if (amount >= MIN_LARGE) { + /* + * large block + */ + /* mmapped malloc */ + /* round up amount */ + amount += SIZE_HEADER + TAIL_SIZE; + /* round up brutto amount to a multiple of the page size */ + amount = (amount + pagesize-1) & ~(pagesize-1); +#ifdef MMAP_DEV_ZERO + ptr = (unsigned long *)mmap((caddr_t)0, + (size_t)amount, + PROT_READ | PROT_WRITE, + MAP_PRIVATE, + devzerofd, + (off_t)0); +#else + ptr = (unsigned long *)mmap((caddr_t)0, + (size_t)amount, + PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE, + -1, + (off_t)0); +#endif + if (-1!=(long)ptr) { + ptr[0] = amount - SIZE_HEADER - TAIL_SIZE; +#ifdef XALLOC_DEBUG + ptr[1] = MAGIC; +#endif /* XALLOC_DEBUG */ +#ifdef SIZE_TAIL + ((unsigned long *)((char *)ptr + amount - TAIL_SIZE))[0] = MAGIC2; +#endif /* SIZE_TAIL */ + ptr = (unsigned long *)((char *)ptr + SIZE_HEADER); + LOG_ALLOC("Xalloc-L", amount, ptr); + return (void *)ptr; + } /* else fall through to 'Out of memory' */ +#endif /* HAS_MMAP_ANON || MMAP_DEV_ZERO */ + } else { + /* + * medium sized block + */ + /* 'normal' malloc() */ + ptr=(unsigned long *)calloc(1,amount+SIZE_HEADER+TAIL_SIZE); + if (ptr != (unsigned long *)NULL) { + ptr[0] = amount; +#ifdef XALLOC_DEBUG + ptr[1] = MAGIC; +#endif /* XALLOC_DEBUG */ +#ifdef SIZE_TAIL + *(unsigned long *)((char *)ptr + amount + SIZE_HEADER) = MAGIC2; +#endif /* SIZE_TAIL */ + ptr = (unsigned long *)((char *)ptr + SIZE_HEADER); + LOG_ALLOC("Xalloc-M", amount, ptr); + return (void *)ptr; + } + } + if (Must_have_memory) + FatalError("Out of memory"); + LOG_ALLOC("Xalloc-oom", amount, 0); + return NULL; +} + +/***************** + * XNFalloc + * "no failure" realloc, alternate interface to Xalloc w/o Must_have_memory + *****************/ + +pointer +XNFalloc (unsigned long amount) +{ + register pointer ptr; + + /* zero size requested */ + if (amount == 0) { + LOG_ALLOC("XNFalloc=0", amount, 0); + return NULL; + } + /* negative size (or size > 2GB) - what do we do? */ + if ((long)amount < 0) { + /* Diagnostic */ +#ifdef FATALERRORS + FatalError("Xalloc: XNFalloc(<0)\n"); +#else + ErrorF("Xalloc warning: XNFalloc(<0) ignored..\n"); +#endif + LOG_ALLOC("XNFalloc<0", amount, 0); + return (unsigned long *)NULL; + } + ptr = Xalloc(amount); + if (!ptr) + { + FatalError("Out of memory"); + } + return ptr; +} + +/***************** + * Xcalloc + *****************/ + +pointer +Xcalloc (unsigned long amount) +{ + pointer ret; + + ret = Xalloc (amount); + if (ret != 0 +#if defined(HAS_MMAP_ANON) || defined(MMAP_DEV_ZERO) + && (amount < MIN_LARGE) /* mmaped anonymous mem is already cleared */ +#endif + ) + bzero ((char *) ret, (int) amount); + return ret; +} + +/***************** + * XNFcalloc + *****************/ +void * +XNFcalloc (unsigned long amount) +{ + pointer ret; + + ret = XNFalloc (amount); + if (ret != 0 +#if defined(HAS_MMAP_ANON) || defined(MMAP_DEV_ZERO) + && (amount < MIN_LARGE) /* mmaped anonymous mem is already cleared */ +#endif + ) + bzero ((char *) ret, (int) amount); + return ret; +} + +/***************** + * Xrealloc + *****************/ + +void * +Xrealloc (pointer ptr, unsigned long amount) +{ + register unsigned long *new_ptr; + + /* zero size requested */ + if (amount == 0) { + if (ptr) + Xfree(ptr); + LOG_REALLOC("Xrealloc=0", ptr, amount, 0); + return NULL; + } + /* negative size (or size > 2GB) - what do we do? */ + if ((long)amount < 0) { + /* Diagnostic */ +#ifdef FATALERRORS + FatalError("Xalloc: Xrealloc(<0)\n"); +#else + ErrorF("Xalloc warning: Xrealloc(<0) ignored..\n"); +#endif + if (ptr) + Xfree(ptr); /* ?? */ + LOG_REALLOC("Xrealloc<0", ptr, amount, 0); + return NULL; + } + + new_ptr = Xalloc(amount); + if ( (new_ptr) && (ptr) ) { + unsigned long old_size; + old_size = ((unsigned long *)ptr)[-2]; +#ifdef XALLOC_DEBUG + if (MAGIC != ((unsigned long *)ptr)[-1]) { + if (MAGIC_FREE == ((unsigned long *)ptr)[-1]) { +#ifdef FATALERRORS + XfreeTrap(); + FatalError("Xalloc error: range already freed in Xrealloc() :-(\n"); +#else + ErrorF("Xalloc error: range already freed in Xrealloc() :-(\a\n"); + sleep(5); + XfreeTrap(); +#endif + LOG_REALLOC("Xalloc error: ranged already freed in Xrealloc() :-(", + ptr, amount, 0); + return NULL; + } +#ifdef FATALERRORS + XfreeTrap(); + FatalError("Xalloc error: header corrupt in Xrealloc() :-(\n"); +#else + ErrorF("Xalloc error: header corrupt in Xrealloc() :-(\n"); + XfreeTrap(); +#endif + LOG_REALLOC("Xalloc error: header corrupt in Xrealloc() :-(", + ptr, amount, 0); + return NULL; + } +#endif /* XALLOC_DEBUG */ + /* copy min(old size, new size) */ + memcpy((char *)new_ptr, (char *)ptr, (amount < old_size ? amount : old_size)); + } + if (ptr) + Xfree(ptr); + if (new_ptr) { + LOG_REALLOC("Xrealloc", ptr, amount, new_ptr); + return (void *)new_ptr; + } + if (Must_have_memory) + FatalError("Out of memory"); + LOG_REALLOC("Xrealloc", ptr, amount, 0); + return NULL; +} + +/***************** + * XNFrealloc + * "no failure" realloc, alternate interface to Xrealloc w/o Must_have_memory + *****************/ + +void * +XNFrealloc (pointer ptr, unsigned long amount) +{ + if (( ptr = (pointer)Xrealloc( ptr, amount ) ) == NULL) + { + FatalError( "Out of memory" ); + } + return ptr; +} + +/***************** + * Xfree + * calls free + *****************/ + +void +Xfree(pointer ptr) +{ + unsigned long size; + unsigned long *pheader; + + /* free(NULL) IS valid :-( - and widely used throughout the server.. */ + if (!ptr) + return; + + pheader = (unsigned long *)((char *)ptr - SIZE_HEADER); +#ifdef XALLOC_DEBUG + if (MAGIC != pheader[1]) { + /* Diagnostic */ + if (MAGIC_FREE == pheader[1]) { +#ifdef FATALERRORS + XfreeTrap(); + FatalError("Xalloc error: range already freed in Xrealloc() :-(\n"); +#else + ErrorF("Xalloc error: range already freed in Xrealloc() :-(\a\n"); + sleep(5); + XfreeTrap(); +#endif + LOG_FREE("Xalloc error: ranged already freed in Xrealloc() :-(", ptr); + return; + } +#ifdef FATALERRORS + XfreeTrap(); + FatalError("Xalloc error: Header corrupt in Xfree() :-(\n"); +#else + ErrorF("Xalloc error: Header corrupt in Xfree() :-(\n"); + XfreeTrap(); +#endif + LOG_FREE("Xalloc error: Header corrupt in Xfree() :-(", ptr); + return; + } +#endif /* XALLOC_DEBUG */ + + size = pheader[0]; + if (size <= MAX_SMALL) { + int indx; + /* + * small block + */ +#ifdef SIZE_TAIL + if (MAGIC2 != *(unsigned long *)((char *)ptr + size)) { + /* Diagnostic */ +#ifdef FATALERRORS + XfreeTrap(); + FatalError("Xalloc error: Tail corrupt in Xfree() for small block (adr=0x%x, val=0x%x)\n",(char *)ptr + size,*(unsigned long *)((char *)ptr + size)); +#else + ErrorF("Xalloc error: Tail corrupt in Xfree() for small block (adr=0x%x, val=0x%x)\n",(char *)ptr + size,*(unsigned long *)((char *)ptr + size)); + XfreeTrap(); +#endif + LOG_FREE("Xalloc error: Tail corrupt in Xfree() for small block", ptr); + return; + } +#endif /* SIZE_TAIL */ + +#ifdef XFREE_ERASES + memset(ptr,0xF0,size); +#endif /* XFREE_ERASES */ +#ifdef XALLOC_DEBUG + pheader[1] = MAGIC_FREE; +#endif + /* put this small block at the head of the list */ + indx = (size-1) / SIZE_STEPS; + *(unsigned long **)(ptr) = free_lists[indx]; + free_lists[indx] = (unsigned long *)ptr; + LOG_FREE("Xfree", ptr); + return; + +#if defined(HAS_MMAP_ANON) || defined(MMAP_DEV_ZERO) + } else if (size >= MIN_LARGE) { + /* + * large block + */ +#ifdef SIZE_TAIL + if (MAGIC2 != ((unsigned long *)((char *)ptr + size))[0]) { + /* Diagnostic */ +#ifdef FATALERRORS + XfreeTrap(); + FatalError("Xalloc error: Tail corrupt in Xfree() for big block (adr=0x%x, val=0x%x)\n",(char *)ptr+size,((unsigned long *)((char *)ptr + size))[0]); +#else + ErrorF("Xalloc error: Tail corrupt in Xfree() for big block (adr=0x%x, val=0x%x)\n",(char *)ptr+size,((unsigned long *)((char *)ptr + size))[0]); + XfreeTrap(); +#endif + LOG_FREE("Xalloc error: Tail corrupt in Xfree() for big block", ptr); + return; + } + size += SIZE_TAIL; +#endif /* SIZE_TAIL */ + + LOG_FREE("Xfree", ptr); + size += SIZE_HEADER; + munmap((caddr_t)pheader, (size_t)size); + /* no need to clear - mem is inaccessible after munmap.. */ +#endif /* HAS_MMAP_ANON */ + + } else { + /* + * medium sized block + */ +#ifdef SIZE_TAIL + if (MAGIC2 != *(unsigned long *)((char *)ptr + size)) { + /* Diagnostic */ +#ifdef FATALERRORS + XfreeTrap(); + FatalError("Xalloc error: Tail corrupt in Xfree() for medium block (adr=0x%x, val=0x%x)\n",(char *)ptr + size,*(unsigned long *)((char *)ptr + size)); +#else + ErrorF("Xalloc error: Tail corrupt in Xfree() for medium block (adr=0x%x, val=0x%x)\n",(char *)ptr + size,*(unsigned long *)((char *)ptr + size)); + XfreeTrap(); +#endif + LOG_FREE("Xalloc error: Tail corrupt in Xfree() for medium block", ptr); + return; + } +#endif /* SIZE_TAIL */ + +#ifdef XFREE_ERASES + memset(pheader,0xF0,size+SIZE_HEADER); +#endif /* XFREE_ERASES */ +#ifdef XALLOC_DEBUG + pheader[1] = MAGIC_FREE; +#endif + + LOG_FREE("Xfree", ptr); + free((char *)pheader); + } +} + +void +OsInitAllocator (void) +{ + static Bool beenhere = FALSE; + + if (beenhere) + return; + beenhere = TRUE; + +#if defined(HAS_MMAP_ANON) || defined (MMAP_DEV_ZERO) + pagesize = -1; +#if defined(_SC_PAGESIZE) || defined(HAS_SC_PAGESIZE) + pagesize = sysconf(_SC_PAGESIZE); +#endif +#ifdef _SC_PAGE_SIZE + if (pagesize == -1) + pagesize = sysconf(_SC_PAGE_SIZE); +#endif +#ifdef HAS_GETPAGESIZE + if (pagesize == -1) + pagesize = getpagesize(); +#endif +#ifdef PAGE_SIZE + if (pagesize == -1) + pagesize = PAGE_SIZE; +#endif + if (pagesize == -1) + FatalError("OsInitAllocator: Cannot determine page size\n"); +#endif + + /* set up linked lists of free blocks */ + bzero ((char *) free_lists, MAX_SMALL/SIZE_STEPS*sizeof(unsigned long *)); + +#ifdef MMAP_DEV_ZERO + /* open /dev/zero on systems that have mmap, but not MAP_ANON */ + if (devzerofd < 0) { + if ((devzerofd = open("/dev/zero", O_RDWR, 0)) < 0) + FatalError("OsInitAllocator: Cannot open /dev/zero (errno=%d)\n", + errno); + } +#endif + +#ifdef XALLOC_LOG + /* reset the log file to zero length */ + { + FILE *f; + f = fopen(XALLOC_LOG_FILE, "w"); + if (NULL!=f) + fclose(f); + } +#endif +} + +#else /* !INTERNAL_MALLOC */ +/* This is to avoid an empty .o */ +static int no_internal_xalloc; +#endif /* INTERNAL_MALLOC */ |