persistentstorage/sql/SQLite/mem4.c
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Wed, 15 Sep 2010 14:05:58 +0300
branchRCL_3
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permissions -rw-r--r--
Revision: 201036 Kit: 201036
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/*
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** 2007 August 14
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**
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** The author disclaims copyright to this source code.  In place of
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** a legal notice, here is a blessing:
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**
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**    May you do good and not evil.
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**    May you find forgiveness for yourself and forgive others.
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**    May you share freely, never taking more than you give.
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**
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*************************************************************************
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** This file contains the C functions that implement a memory
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** allocation subsystem for use by SQLite.  
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**
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** $Id: mem4.c,v 1.3 2008/06/18 17:09:10 danielk1977 Exp $
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*/
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#include "sqliteInt.h"
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/*
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** This version of the memory allocator attempts to obtain memory
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** from mmap() if the size of the allocation is close to the size
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** of a virtual memory page.  If the size of the allocation is different
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** from the virtual memory page size, then ordinary malloc() is used.
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** Ordinary malloc is also used if space allocated to mmap() is
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** exhausted.
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**
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** Enable this memory allocation by compiling with -DSQLITE_MMAP_HEAP_SIZE=nnn
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** where nnn is the maximum number of bytes of mmap-ed memory you want 
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** to support.   This module may choose to use less memory than requested.
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**
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*/
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#ifdef SQLITE_MMAP_HEAP_SIZE
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/*
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** This is a test version of the memory allocator that attempts to
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** use mmap() and madvise() for allocations and frees of approximately
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** the virtual memory page size.
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <errno.h>
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#include <unistd.h>
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/*
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** All of the static variables used by this module are collected
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** into a single structure named "mem".  This is to keep the
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** static variables organized and to reduce namespace pollution
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** when this module is combined with other in the amalgamation.
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*/
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static struct {
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  /*
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  ** The alarm callback and its arguments.  The mem.mutex lock will
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  ** be held while the callback is running.  Recursive calls into
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  ** the memory subsystem are allowed, but no new callbacks will be
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  ** issued.  The alarmBusy variable is set to prevent recursive
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  ** callbacks.
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  */
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  sqlite3_int64 alarmThreshold;
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  void (*alarmCallback)(void*, sqlite3_int64,int);
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  void *alarmArg;
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  int alarmBusy;
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  /*
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  ** Mutex to control access to the memory allocation subsystem.
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  */
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  sqlite3_mutex *mutex;
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  /*
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  ** Current allocation and high-water mark.
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  */
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  sqlite3_int64 nowUsed;
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  sqlite3_int64 mxUsed;
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  /*
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  ** Current allocation and high-water marks for mmap allocated memory.
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  */
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  sqlite3_int64 nowUsedMMap;
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  sqlite3_int64 mxUsedMMap;
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  /*
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  ** Size of a single mmap page.  Obtained from sysconf().
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  */
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  int szPage;
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  int mnPage;
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  /*
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  ** The number of available mmap pages.
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  */
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  int nPage;
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  /*
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  ** Index of the first free page.  0 means no pages have been freed.
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  */
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  int firstFree;
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  /* First unused page on the top of the heap.
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  */
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  int firstUnused;
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  /*
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  ** Bulk memory obtained from from mmap().
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  */
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  char *mmapHeap;   /* first byte of the heap */ 
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} mem;
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/*
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** Enter the mutex mem.mutex. Allocate it if it is not already allocated.
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** The mmap() region is initialized the first time this routine is called.
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*/
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static void memsys4Enter(void){
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  if( mem.mutex==0 ){
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    mem.mutex = sqlite3MutexAlloc(SQLITE_MUTEX_STATIC_MEM);
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  }
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  sqlite3_mutex_enter(mem.mutex);
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}
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   119
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/*
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** Attempt to free memory to the mmap heap.  This only works if
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** the pointer p is within the range of memory addresses that
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** comprise the mmap heap.  Return 1 if the memory was freed
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** successfully.  Return 0 if the pointer is out of range.
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*/
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static int mmapFree(void *p){
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  char *z;
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  int idx, *a;
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  if( mem.mmapHeap==MAP_FAILED || mem.nPage==0 ){
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    return 0;
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  }
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  z = (char*)p;
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  idx = (z - mem.mmapHeap)/mem.szPage;
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  if( idx<1 || idx>=mem.nPage ){
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    return 0;
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  }
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  a = (int*)mem.mmapHeap;
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  a[idx] = a[mem.firstFree];
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  mem.firstFree = idx;
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  mem.nowUsedMMap -= mem.szPage;
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  madvise(p, mem.szPage, MADV_DONTNEED);
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  return 1;
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}
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   144
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   145
/*
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** Attempt to allocate nBytes from the mmap heap.  Return a pointer
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** to the allocated page.  Or, return NULL if the allocation fails.
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** 
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** The allocation will fail if nBytes is not the right size.
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** Or, the allocation will fail if the mmap heap has been exhausted.
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*/
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static void *mmapAlloc(int nBytes){
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  int idx = 0;
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  if( nBytes>mem.szPage || nBytes<mem.mnPage ){
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    return 0;
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  }
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  if( mem.nPage==0 ){
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    mem.szPage = sysconf(_SC_PAGE_SIZE);
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    mem.mnPage = mem.szPage - mem.szPage/10;
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    mem.nPage = SQLITE_MMAP_HEAP_SIZE/mem.szPage;
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    if( mem.nPage * sizeof(int) > mem.szPage ){
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      mem.nPage = mem.szPage/sizeof(int);
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    }
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    mem.mmapHeap =  mmap(0, mem.szPage*mem.nPage, PROT_WRITE|PROT_READ,
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                         MAP_ANONYMOUS|MAP_SHARED, -1, 0);
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    if( mem.mmapHeap==MAP_FAILED ){
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      mem.firstUnused = errno;
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   168
    }else{
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      mem.firstUnused = 1;
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      mem.nowUsedMMap = mem.szPage;
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    }
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  }
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   173
  if( mem.mmapHeap==MAP_FAILED ){
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    return 0;
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  }
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  if( mem.firstFree ){
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   177
    int idx = mem.firstFree;
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    int *a = (int*)mem.mmapHeap;
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    mem.firstFree = a[idx];
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  }else if( mem.firstUnused<mem.nPage ){
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    idx = mem.firstUnused++;
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  }
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  if( idx ){
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    mem.nowUsedMMap += mem.szPage;
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   185
    if( mem.nowUsedMMap>mem.mxUsedMMap ){
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      mem.mxUsedMMap = mem.nowUsedMMap;
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   187
    }
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    return (void*)&mem.mmapHeap[idx*mem.szPage];
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   189
  }else{
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    return 0;
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  }
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}
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   193
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   194
/*
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** Release the mmap-ed memory region if it is currently allocated and
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** is not in use.
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*/
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   198
static void mmapUnmap(void){
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  if( mem.mmapHeap==MAP_FAILED ) return;
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  if( mem.nPage==0 ) return;
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   201
  if( mem.nowUsedMMap>mem.szPage ) return;
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  munmap(mem.mmapHeap, mem.nPage*mem.szPage);
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  mem.nowUsedMMap = 0;
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  mem.nPage = 0;
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   205
}
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   206
    
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   207
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   208
/*
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** Return the amount of memory currently checked out.
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*/
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   211
sqlite3_int64 sqlite3_memory_used(void){
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  sqlite3_int64 n;
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  memsys4Enter();
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  n = mem.nowUsed + mem.nowUsedMMap;
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   215
  sqlite3_mutex_leave(mem.mutex);  
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  return n;
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}
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   218
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   219
/*
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   220
** Return the maximum amount of memory that has ever been
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   221
** checked out since either the beginning of this process
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   222
** or since the most recent reset.
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   223
*/
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   224
sqlite3_int64 sqlite3_memory_highwater(int resetFlag){
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   225
  sqlite3_int64 n;
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  memsys4Enter();
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  n = mem.mxUsed + mem.mxUsedMMap;
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  if( resetFlag ){
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   229
    mem.mxUsed = mem.nowUsed;
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    mem.mxUsedMMap = mem.nowUsedMMap;
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  }
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  sqlite3_mutex_leave(mem.mutex);  
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  return n;
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}
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   235
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   236
/*
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** Change the alarm callback
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*/
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   239
int sqlite3_memory_alarm(
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  void(*xCallback)(void *pArg, sqlite3_int64 used,int N),
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  void *pArg,
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  sqlite3_int64 iThreshold
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){
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  memsys4Enter();
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  mem.alarmCallback = xCallback;
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  mem.alarmArg = pArg;
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  mem.alarmThreshold = iThreshold;
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  sqlite3_mutex_leave(mem.mutex);
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  return SQLITE_OK;
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}
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/*
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** Trigger the alarm 
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*/
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static void sqlite3MemsysAlarm(int nByte){
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  void (*xCallback)(void*,sqlite3_int64,int);
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  sqlite3_int64 nowUsed;
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  void *pArg;
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   259
  if( mem.alarmCallback==0 || mem.alarmBusy  ) return;
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  mem.alarmBusy = 1;
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  xCallback = mem.alarmCallback;
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  nowUsed = mem.nowUsed;
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   263
  pArg = mem.alarmArg;
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   264
  sqlite3_mutex_leave(mem.mutex);
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  xCallback(pArg, nowUsed, nByte);
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  sqlite3_mutex_enter(mem.mutex);
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  mem.alarmBusy = 0;
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}
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   269
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/*
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** Allocate nBytes of memory
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*/
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static void *memsys4Malloc(int nBytes){
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  sqlite3_int64 *p = 0;
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  if( mem.alarmCallback!=0
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         && mem.nowUsed+mem.nowUsedMMap+nBytes>=mem.alarmThreshold ){
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    sqlite3MemsysAlarm(nBytes);
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  }
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  if( (p = mmapAlloc(nBytes))==0 ){
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    p = malloc(nBytes+8);
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    if( p==0 ){
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      sqlite3MemsysAlarm(nBytes);
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      p = malloc(nBytes+8);
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    }
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    if( p ){
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      p[0] = nBytes;
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      p++;
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      mem.nowUsed += nBytes;
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   289
      if( mem.nowUsed>mem.mxUsed ){
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        mem.mxUsed = mem.nowUsed;
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   291
      }
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    }
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   293
  }
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  return (void*)p; 
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}
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   296
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   297
/*
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** Return the size of a memory allocation
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   299
*/
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static int memsys4Size(void *pPrior){
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   301
  char *z = (char*)pPrior;
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  int idx = mem.nPage ? (z - mem.mmapHeap)/mem.szPage : 0;
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  int nByte;
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   304
  if( idx>=1 && idx<mem.nPage ){
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   305
    nByte = mem.szPage;
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parents:
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   306
  }else{
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   307
    sqlite3_int64 *p = pPrior;
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   308
    p--;
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   309
    nByte = (int)*p;
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  }
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  return nByte;
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   312
}
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   313
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   314
/*
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   315
** Free memory.
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   316
*/
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   317
static void memsys4Free(void *pPrior){
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   318
  sqlite3_int64 *p;
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parents:
diff changeset
   319
  int nByte;
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parents:
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   320
  if( mmapFree(pPrior)==0 ){
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parents:
diff changeset
   321
    p = pPrior;
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   322
    p--;
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   323
    nByte = (int)*p;
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   324
    mem.nowUsed -= nByte;
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   325
    free(p);
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   326
    if( mem.nowUsed==0 ){
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   327
      mmapUnmap();
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parents:
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   328
    }      
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   329
  }
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   330
}
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parents:
diff changeset
   331
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diff changeset
   332
/*
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diff changeset
   333
** Allocate nBytes of memory
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parents:
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   334
*/
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parents:
diff changeset
   335
void *sqlite3_malloc(int nBytes){
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   336
  sqlite3_int64 *p = 0;
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parents:
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   337
  if( nBytes>0 ){
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parents:
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   338
    memsys4Enter();
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parents:
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   339
    p = memsys4Malloc(nBytes);
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   340
    sqlite3_mutex_leave(mem.mutex);
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  }
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  return (void*)p; 
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}
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   344
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   345
/*
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** Free memory.
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   347
*/
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   348
void sqlite3_free(void *pPrior){
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   349
  if( pPrior==0 ){
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    return;
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  }
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   352
  assert( mem.mutex!=0 );
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   353
  sqlite3_mutex_enter(mem.mutex);
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   354
  memsys4Free(pPrior);
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   355
  sqlite3_mutex_leave(mem.mutex);  
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   356
}
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   357
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   358
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   359
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   360
/*
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   361
** Change the size of an existing memory allocation
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   362
*/
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   363
void *sqlite3_realloc(void *pPrior, int nBytes){
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   364
  int nOld;
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   365
  sqlite3_int64 *p;
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   366
  if( pPrior==0 ){
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   367
    return sqlite3_malloc(nBytes);
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   368
  }
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   369
  if( nBytes<=0 ){
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   370
    sqlite3_free(pPrior);
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   371
    return 0;
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   372
  }
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   373
  nOld = memsys4Size(pPrior);
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   374
  if( nBytes<=nOld && nBytes>=nOld-128 ){
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   375
    return pPrior;
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   376
  }
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   377
  assert( mem.mutex!=0 );
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   378
  sqlite3_mutex_enter(mem.mutex);
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   379
  p = memsys4Malloc(nBytes);
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   380
  if( p ){
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   381
    if( nOld<nBytes ){
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   382
      memcpy(p, pPrior, nOld);
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   383
    }else{
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   384
      memcpy(p, pPrior, nBytes);
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   385
    }
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   386
    memsys4Free(pPrior);
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   387
  }
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   388
  assert( mem.mutex!=0 );
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   389
  sqlite3_mutex_leave(mem.mutex);
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   390
  return (void*)p;
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   391
}
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   392
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   393
#endif /* SQLITE_MMAP_HEAP_SIZE */