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Overview
Comment:Work in progress porting lsm1 to Win32.
Downloads: Tarball | ZIP archive | SQL archive
Timelines: family | ancestors | descendants | both | lsm-vtab
Files: files | file ages | folders
SHA3-256:2017636e93cf810fe4d1247c18de9f316fca037035a026f77c4588563d7bf0cc
User & Date: mistachkin 2017-06-27 05:59:47
Context
2017-06-27
06:28
Minor corrections to the previous check-in. check-in: e1cf8a78 user: mistachkin tags: lsm-vtab
05:59
Work in progress porting lsm1 to Win32. check-in: 2017636e user: mistachkin tags: lsm-vtab
2017-06-26
11:46
Remove an invalid assert() from lsm test code. check-in: ca8a7e99 user: dan tags: lsm-vtab
Changes
Hide Diffs Unified Diffs Ignore Whitespace Patch

Changes to Makefile.msc.

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dbselftest.exe:	$(TOP)\test\dbselftest.c $(SQLITE3C) $(SQLITE3H)
	$(LTLINK) $(NO_WARN) $(DBSELFTEST_COMPILE_OPTS) $(TOP)\test\dbselftest.c $(SQLITE3C)

rbu.exe:	$(TOP)\ext\rbu\rbu.c $(TOP)\ext\rbu\sqlite3rbu.c $(SQLITE3C) $(SQLITE3H)
	$(LTLINK) $(NO_WARN) -DSQLITE_ENABLE_RBU \
		$(TOP)\ext\rbu\rbu.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)




moreclean:	clean
	del /Q $(SQLITE3C) $(SQLITE3H) 2>NUL
# <</mark>>

clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.def *.cod *.da *.bb *.bbg *.vc gmon.out 2>NUL







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dbselftest.exe:	$(TOP)\test\dbselftest.c $(SQLITE3C) $(SQLITE3H)
	$(LTLINK) $(NO_WARN) $(DBSELFTEST_COMPILE_OPTS) $(TOP)\test\dbselftest.c $(SQLITE3C)

rbu.exe:	$(TOP)\ext\rbu\rbu.c $(TOP)\ext\rbu\sqlite3rbu.c $(SQLITE3C) $(SQLITE3H)
	$(LTLINK) $(NO_WARN) -DSQLITE_ENABLE_RBU \
		$(TOP)\ext\rbu\rbu.c $(SQLITE3C) /link $(LDFLAGS) $(LTLINKOPTS)

LSMDIR=$(TOP)\ext\lsm1
!INCLUDE $(LSMDIR)\Makefile.msc

moreclean:	clean
	del /Q $(SQLITE3C) $(SQLITE3H) 2>NUL
# <</mark>>

clean:
	del /Q *.exp *.lo *.ilk *.lib *.obj *.ncb *.pdb *.sdf *.suo 2>NUL
	del /Q *.bsc *.def *.cod *.da *.bb *.bbg *.vc gmon.out 2>NUL

Added ext/lsm1/Makefile.msc.



























































































































































































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#
# This Makefile is designed for use with main.mk in the root directory of
# this project. After including main.mk, the users makefile should contain:
#
#    LSMDIR=$(TOP)\ext\lsm1\
#    include $(LSMDIR)\Makefile.msc
#
# The most useful targets are [lsmtest.exe] and [lsm.dll].
#

LSMOBJ    = \
  lsm_ckpt.lo \
  lsm_file.lo \
  lsm_log.lo \
  lsm_main.lo \
  lsm_mem.lo \
  lsm_mutex.lo \
  lsm_shared.lo \
  lsm_sorted.lo \
  lsm_str.lo \
  lsm_tree.lo \
  lsm_unix.lo \
  lsm_win32.lo \
  lsm_varint.lo \
  lsm_vtab.lo

LSMHDR   = \
  $(LSMDIR)\lsm.h \
  $(LSMDIR)\lsmInt.h

LSMTESTSRC = $(LSMDIR)\lsm-test\lsmtest1.c $(LSMDIR)\lsm-test\lsmtest2.c     \
             $(LSMDIR)\lsm-test\lsmtest3.c $(LSMDIR)\lsm-test\lsmtest4.c     \
             $(LSMDIR)\lsm-test\lsmtest5.c $(LSMDIR)\lsm-test\lsmtest6.c     \
             $(LSMDIR)\lsm-test\lsmtest7.c $(LSMDIR)\lsm-test\lsmtest8.c     \
             $(LSMDIR)\lsm-test\lsmtest9.c                                   \
             $(LSMDIR)\lsm-test\lsmtest_datasource.c \
             $(LSMDIR)\lsm-test\lsmtest_func.c $(LSMDIR)\lsm-test\lsmtest_io.c  \
             $(LSMDIR)\lsm-test\lsmtest_main.c $(LSMDIR)\lsm-test\lsmtest_mem.c \
             $(LSMDIR)\lsm-test\lsmtest_tdb.c $(LSMDIR)\lsm-test\lsmtest_tdb3.c \
             $(LSMDIR)\lsm-test\lsmtest_util.c

# all: lsm.dll

LSMOPTS = -DLSM_MUTEX_WIN32=1 -I$(LSMDIR)

lsm_ckpt.lo:	$(LSMDIR)\lsm_ckpt.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_ckpt.c

lsm_file.lo:	$(LSMDIR)\lsm_file.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_file.c

lsm_log.lo:	$(LSMDIR)\lsm_log.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_log.c

lsm_main.lo:	$(LSMDIR)\lsm_main.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_main.c

lsm_mem.lo:	$(LSMDIR)\lsm_mem.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_mem.c

lsm_mutex.lo:	$(LSMDIR)\lsm_mutex.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_mutex.c

lsm_shared.lo:	$(LSMDIR)\lsm_shared.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_shared.c

lsm_sorted.lo:	$(LSMDIR)\lsm_sorted.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_sorted.c

lsm_str.lo:	$(LSMDIR)\lsm_str.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_str.c

lsm_tree.lo:	$(LSMDIR)\lsm_tree.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_tree.c

lsm_unix.lo:	$(LSMDIR)\lsm_unix.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_unix.c

lsm_win32.lo:	$(LSMDIR)\lsm_win32.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_win32.c

lsm_varint.lo:	$(LSMDIR)\lsm_varint.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_varint.c

lsm_vtab.lo:	$(LSMDIR)\lsm_vtab.c $(LSMHDR) $(SQLITE3H)
	$(LTCOMPILE) $(LSMOPTS) -c $(LSMDIR)\lsm_vtab.c

lsm.dll:	$(LSMOBJ)
	$(LD) $(LDFLAGS) $(LTLINKOPTS) $(LTLIBPATHS) /VERBOSE /DLL /OUT:$@ $(LSMOBJ)

lsmtest.exe: $(LSMOBJ) $(LSMTESTSRC) $(LSMTESTHDR) $(LIBOBJS1)
	# $(LTCOMPILE) -c $(TOP)\lsm-test\lsmtest_tdb2.cc
	$(LTCOMPILE) $(LSMOPTS) $(LSMTESTSRC) $(LSMOBJ) $(LIBOBJS1) -Fe$@

Changes to ext/lsm1/lsmInt.h.

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#include <string.h>

#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>




#include <unistd.h>


#ifdef NDEBUG
# ifdef LSM_DEBUG_EXPENSIVE
#  undef LSM_DEBUG_EXPENSIVE
# endif
# ifdef LSM_DEBUG
#  undef LSM_DEBUG







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#include <string.h>

#include <stdarg.h>
#include <stdlib.h>
#include <stdio.h>
#include <ctype.h>

#ifdef _WIN32
# define snprintf _snprintf
#else
# include <unistd.h>
#endif

#ifdef NDEBUG
# ifdef LSM_DEBUG_EXPENSIVE
#  undef LSM_DEBUG_EXPENSIVE
# endif
# ifdef LSM_DEBUG
#  undef LSM_DEBUG

Changes to ext/lsm1/lsm_file.c.

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  Snapshot *pSnapshot,
  Level *pLvl,
  int bDefer,
  Page **ppOut
){
  int rc = LSM_OK;
  Page *pPg = 0;
  *ppOut = 0;
  int iApp = 0;
  int iNext = 0;
  Segment *p = &pLvl->lhs;
  int iPrev = p->iLastPg;


  assert( p->pRedirect==0 );

  if( pFS->pCompress || bDefer ){
    /* In compressed database mode the page is not assigned a page number
    ** or location in the database file at this point. This will be done
    ** by the lsmFsPagePersist() call.  */
    rc = fsPageBuffer(pFS, &pPg);







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  Snapshot *pSnapshot,
  Level *pLvl,
  int bDefer,
  Page **ppOut
){
  int rc = LSM_OK;
  Page *pPg = 0;

  int iApp = 0;
  int iNext = 0;
  Segment *p = &pLvl->lhs;
  int iPrev = p->iLastPg;

  *ppOut = 0;
  assert( p->pRedirect==0 );

  if( pFS->pCompress || bDefer ){
    /* In compressed database mode the page is not assigned a page number
    ** or location in the database file at this point. This will be done
    ** by the lsmFsPagePersist() call.  */
    rc = fsPageBuffer(pFS, &pPg);

Changes to ext/lsm1/lsm_unix.c.

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**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** Unix-specific run-time environment implementation for LSM.
*/

#ifndef WIN32

#if defined(__GNUC__) || defined(__TINYC__)
/* workaround for ftruncate() visibility on gcc. */
# ifndef _XOPEN_SOURCE
#  define _XOPEN_SOURCE 500
# endif
#endif







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**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** Unix-specific run-time environment implementation for LSM.
*/

#ifndef _WIN32

#if defined(__GNUC__) || defined(__TINYC__)
/* workaround for ftruncate() visibility on gcc. */
# ifndef _XOPEN_SOURCE
#  define _XOPEN_SOURCE 500
# endif
#endif

Changes to ext/lsm1/lsm_win32.c.

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**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** Unix-specific run-time environment implementation for LSM.
*/

#ifdef WIN32

#if defined(__GNUC__) || defined(__TINYC__)
/* workaround for ftruncate() visibility on gcc. */
# ifndef _XOPEN_SOURCE
#  define _XOPEN_SOURCE 500
# endif
#endif

#include <unistd.h>
#include <sys/types.h>

#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <string.h>

#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <ctype.h>

#include <unistd.h>
#include <errno.h>

#include "lsmInt.h"

/*
** An open file is an instance of the following object
*/
typedef struct Win32File Win32File;
struct Win32File {
  lsm_env *pEnv;                  /* The run-time environment */
  const char *zName;              /* Full path to file */

  HANDLE h;                       /* Open file descriptor */
  HANDLE shmh;                    /* File descriptor for *-shm file */


  void *pMap;                     /* Pointer to mapping of file fd */
  off_t nMap;                     /* Size of mapping at pMap in bytes */
  int nShm;                       /* Number of entries in array apShm[] */
  void **apShm;                   /* Array of 32K shared memory segments */
};



static char *win32ShmFile(Win32File *p){
  char *zShm;
  int nName = strlen(p->zName);
  zShm = (char *)lsmMalloc(p->pEnv, nName+4+1);
  if( zShm ){
    memcpy(zShm, p->zName, nName);
    memcpy(&zShm[nName], "-shm", 5);
  }
  return zShm;
}






































































































static int lsmWin32OsOpen(
  lsm_env *pEnv,
  const char *zFile,
  int flags,
  lsm_file **ppFile
){
  int rc = LSM_OK;
  Win32File *p;

  p = lsm_malloc(pEnv, sizeof(Win32File));
  if( p==0 ){

    rc = LSM_NOMEM;
  }else{

    int bReadonly = (flags & LSM_OPEN_READONLY);
    int oflags = (bReadonly ? O_RDONLY : (O_RDWR|O_CREAT));









    memset(p, 0, sizeof(Win32File));
    p->zName = zFile;
    p->pEnv = pEnv;










    CreateFile((LPCWSTR)zConverted,
                              dwDesiredAccess,
                              dwShareMode, NULL,
                              dwCreationDisposition,
                              dwFlagsAndAttributes,
                              NULL))==INVALID_HANDLE_VALUE &&
                              winRetryIoerr(&cnt, &lastErrno) ){




    p->fd = open(zFile, oflags, 0644);
    if( p->fd<0 ){





      lsm_free(pEnv, p);
      p = 0;
      if( errno==ENOENT ){

        rc = lsmErrorBkpt(LSM_IOERR_NOENT);
      }else{
        rc = LSM_IOERR_BKPT;

      }
    }
  }

  *ppFile = (lsm_file *)p;
  return rc;
}

static int lsmWin32OsWrite(
  lsm_file *pFile,                /* File to write to */
  lsm_i64 iOff,                   /* Offset to write to */
  void *pData,                    /* Write data from this buffer */
  int nData                       /* Bytes of data to write */
){
  int rc = LSM_OK;
  Win32File *p = (Win32File *)pFile;

  off_t offset;



  offset = lseek(p->fd, (off_t)iOff, SEEK_SET);
  if( offset!=iOff ){
    rc = LSM_IOERR_BKPT;
  }else{
    ssize_t prc = write(p->fd, pData, (size_t)nData);
    if( prc<0 ) rc = LSM_IOERR_BKPT;




  }











  return rc;
}

static int lsmWin32OsTruncate(
  lsm_file *pFile,                /* File to write to */
  lsm_i64 nSize                   /* Size to truncate file to */
){
  Win32File *p = (Win32File *)pFile;
  int rc = LSM_OK;                /* Return code */
  int prc;                        /* Posix Return Code */
  struct stat sStat;              /* Result of fstat() invocation */
  


  prc = fstat(p->fd, &sStat);
  if( prc==0 && sStat.st_size>nSize ){
    prc = ftruncate(p->fd, (off_t)nSize);
  }

  if( prc<0 ) rc = LSM_IOERR_BKPT;

  return rc;
}

static int lsmWin32OsRead(
  lsm_file *pFile,                /* File to read from */
  lsm_i64 iOff,                   /* Offset to read from */
  void *pData,                    /* Read data into this buffer */
  int nData                       /* Bytes of data to read */
){
  int rc = LSM_OK;
  Win32File *p = (Win32File *)pFile;
  off_t offset;

  offset = lseek(p->fd, (off_t)iOff, SEEK_SET);
  if( offset!=iOff ){
    rc = LSM_IOERR_BKPT;
  }else{
    ssize_t prc = read(p->fd, pData, (size_t)nData);
    if( prc<0 ){ 
      rc = LSM_IOERR_BKPT;
    }else if( prc<nData ){
      memset(&((u8 *)pData)[prc], 0, nData - prc);
    }

  }

  return rc;
}

static int lsmWin32OsSync(lsm_file *pFile){
  int rc = LSM_OK;

#ifndef LSM_NO_SYNC
  Win32File *p = (Win32File *)pFile;
  int prc = 0;

  if( p->pMap ){
    prc = msync(p->pMap, p->nMap, MS_SYNC);
  }
  if( prc==0 ) prc = fdatasync(p->fd);
  if( prc<0 ) rc = LSM_IOERR_BKPT;
#else
  (void)pFile;

#endif

  return rc;
}

static int lsmWin32OsSectorSize(lsm_file *pFile){
  return 512;
}

static int lsmWin32OsRemap(
  lsm_file *pFile, 
  lsm_i64 iMin, 
  void **ppOut,
  lsm_i64 *pnOut
){
  off_t iSz;
  int prc;
  Win32File *p = (Win32File *)pFile;
  struct stat buf;

  /* If the file is between 0 and 2MB in size, extend it in chunks of 256K.
  ** Thereafter, in chunks of 1MB at a time.  */
  const int aIncrSz[] = {256*1024, 1024*1024};
  int nIncrSz = aIncrSz[iMin>(2*1024*1024)];

  if( p->pMap ){
    munmap(p->pMap, p->nMap);
    *ppOut = p->pMap = 0;
    *pnOut = p->nMap = 0;
  }

  if( iMin>=0 ){
    memset(&buf, 0, sizeof(buf));
    prc = fstat(p->fd, &buf);
    if( prc!=0 ) return LSM_IOERR_BKPT;
    iSz = buf.st_size;
    if( iSz<iMin ){
      iSz = ((iMin + nIncrSz-1) / nIncrSz) * nIncrSz;
      prc = ftruncate(p->fd, iSz);
      if( prc!=0 ) return LSM_IOERR_BKPT;
    }

    p->pMap = mmap(0, iSz, PROT_READ|PROT_WRITE, MAP_SHARED, p->fd, 0);
    p->nMap = iSz;
  }

  *ppOut = p->pMap;
  *pnOut = p->nMap;
  return LSM_OK;
}

static int lsmWin32OsFullpath(
  lsm_env *pEnv,
  const char *zName,
  char *zOut,
  int *pnOut
){
  int nBuf = *pnOut;
  int nReq;

  if( zName[0]!='/' ){
    char *z;
    char *zTmp;
    int nTmp = 512;
    zTmp = lsmMalloc(pEnv, nTmp);
    while( zTmp ){
      z = getcwd(zTmp, nTmp);
      if( z || errno!=ERANGE ) break;
      nTmp = nTmp*2;
      zTmp = lsmReallocOrFree(pEnv, zTmp, nTmp);
    }
    if( zTmp==0 ) return LSM_NOMEM_BKPT;
    if( z==0 ) return LSM_IOERR_BKPT;
    assert( z==zTmp );

    nTmp = strlen(zTmp);
    nReq = nTmp + 1 + strlen(zName) + 1;
    if( nReq<=nBuf ){
      memcpy(zOut, zTmp, nTmp);
      zOut[nTmp] = '/';
      memcpy(&zOut[nTmp+1], zName, strlen(zName)+1);
    }
    lsmFree(pEnv, zTmp);
  }else{
    nReq = strlen(zName)+1;
    if( nReq<=nBuf ){
      memcpy(zOut, zName, strlen(zName)+1);
    }
  }

  *pnOut = nReq;
  return LSM_OK;
}

static int lsmWin32OsFileid(
  lsm_file *pFile, 
  void *pBuf,
  int *pnBuf
){
  int prc;
  int nBuf;
  int nReq;

  Win32File *p = (Win32File *)pFile;
  struct stat buf;

  nBuf = *pnBuf;
  nReq = (sizeof(buf.st_dev) + sizeof(buf.st_ino));


  *pnBuf = nReq;
  if( nReq>nBuf ) return LSM_OK;

  memset(&buf, 0, sizeof(buf));
  prc = fstat(p->fd, &buf);

  if( prc!=0 ) return LSM_IOERR_BKPT;

  memcpy(pBuf, &buf.st_dev, sizeof(buf.st_dev));
  memcpy(&(((u8 *)pBuf)[sizeof(buf.st_dev)]), &buf.st_ino, sizeof(buf.st_ino));







  return LSM_OK;
}

static int lsmWin32OsUnlink(lsm_env *pEnv, const char *zFile){
  int prc = unlink(zFile);
  return prc ? LSM_IOERR_BKPT : LSM_OK;
}

int lsmWin32OsLock(lsm_file *pFile, int iLock, int eType){
  int rc = LSM_OK;
  Win32File *p = (Win32File *)pFile;
  static const short aType[3] = { F_UNLCK, F_RDLCK, F_WRLCK };
  struct flock lock;

  assert( aType[LSM_LOCK_UNLOCK]==F_UNLCK );
  assert( aType[LSM_LOCK_SHARED]==F_RDLCK );
  assert( aType[LSM_LOCK_EXCL]==F_WRLCK );
  assert( eType>=0 && eType<array_size(aType) );
  assert( iLock>0 && iLock<=32 );

  memset(&lock, 0, sizeof(lock));
  lock.l_whence = SEEK_SET;
  lock.l_len = 1;
  lock.l_type = aType[eType];
  lock.l_start = (4096-iLock);

  if( fcntl(p->fd, F_SETLK, &lock) ){
    int e = errno;
    if( e==EACCES || e==EAGAIN ){
      rc = LSM_BUSY;
    }else{
      rc = LSM_IOERR_BKPT;
    }
  }

  return rc;
}

int lsmWin32OsTestLock(lsm_file *pFile, int iLock, int nLock, int eType){
  int rc = LSM_OK;
  Win32File *p = (Win32File *)pFile;
  static const short aType[3] = { 0, F_RDLCK, F_WRLCK };
  struct flock lock;

  assert( eType==LSM_LOCK_SHARED || eType==LSM_LOCK_EXCL );
  assert( aType[LSM_LOCK_SHARED]==F_RDLCK );
  assert( aType[LSM_LOCK_EXCL]==F_WRLCK );
  assert( eType>=0 && eType<array_size(aType) );
  assert( iLock>0 && iLock<=32 );

  memset(&lock, 0, sizeof(lock));
  lock.l_whence = SEEK_SET;
  lock.l_len = nLock;
  lock.l_type = aType[eType];
  lock.l_start = (4096-iLock);

  if( fcntl(p->fd, F_GETLK, &lock) ){
    rc = LSM_IOERR_BKPT;
  }else if( lock.l_type!=F_UNLCK ){
    rc = LSM_BUSY;
  }

  return rc;
}

int lsmWin32OsShmMap(lsm_file *pFile, int iChunk, int sz, void **ppShm){
  Win32File *p = (Win32File *)pFile;

  *ppShm = 0;
  assert( sz==LSM_SHM_CHUNK_SIZE );
  if( iChunk>=p->nShm ){
    int i;
    void **apNew;
    int nNew = iChunk+1;
    off_t nReq = nNew * LSM_SHM_CHUNK_SIZE;
    struct stat sStat;

    /* If the shared-memory file has not been opened, open it now. */
    if( p->shmfd<=0 ){
      char *zShm = win32ShmFile(p);
      if( !zShm ) return LSM_NOMEM_BKPT;
      p->shmfd = open(zShm, O_RDWR|O_CREAT, 0644);
      lsmFree(p->pEnv, zShm);
      if( p->shmfd<0 ){ 
        return LSM_IOERR_BKPT;
      }
    }

    /* If the shared-memory file is not large enough to contain the 
    ** requested chunk, cause it to grow.  */
    if( fstat(p->shmfd, &sStat) ){
      return LSM_IOERR_BKPT;
    }
    if( sStat.st_size<nReq ){
      if( ftruncate(p->shmfd, nReq) ){
        return LSM_IOERR_BKPT;
      }
    }

    apNew = (void **)lsmRealloc(p->pEnv, p->apShm, sizeof(void *) * nNew);
    if( !apNew ) return LSM_NOMEM_BKPT;
    for(i=p->nShm; i<nNew; i++){
      apNew[i] = 0;
    }
    p->apShm = apNew;
    p->nShm = nNew;
  }

  if( p->apShm[iChunk]==0 ){
    p->apShm[iChunk] = mmap(0, LSM_SHM_CHUNK_SIZE, 
        PROT_READ|PROT_WRITE, MAP_SHARED, p->shmfd, iChunk*LSM_SHM_CHUNK_SIZE
    );
    if( p->apShm[iChunk]==0 ) return LSM_IOERR_BKPT;
  }

  *ppShm = p->apShm[iChunk];
  return LSM_OK;
}

void lsmWin32OsShmBarrier(void){

}

int lsmWin32OsShmUnmap(lsm_file *pFile, int bDelete){
  Win32File *p = (Win32File *)pFile;
  if( p->shmfd>0 ){
    int i;
    for(i=0; i<p->nShm; i++){
      if( p->apShm[i] ){
        munmap(p->apShm[i], LSM_SHM_CHUNK_SIZE);
        p->apShm[i] = 0;

      }
    }
    close(p->shmfd);
    p->shmfd = 0;
    if( bDelete ){
      char *zShm = win32ShmFile(p);
      if( zShm ) unlink(zShm);
      lsmFree(p->pEnv, zShm);









    }



  }



  return LSM_OK;

}





static int lsmWin32OsClose(lsm_file *pFile){
  Win32File *p = (Win32File *)pFile;
  lsmWin32OsShmUnmap(pFile, 0);
  if( p->pMap ) munmap(p->pMap, p->nMap);
  close(p->fd);
  lsm_free(p->pEnv, p->apShm);
  lsm_free(p->pEnv, p);



  return LSM_OK;
}

static int lsmWin32OsSleep(lsm_env *pEnv, int us){
  usleep(us);


  return LSM_OK;
}

/****************************************************************************
** Memory allocation routines.
*/
#define BLOCK_HDR_SIZE ROUND8( sizeof(size_t) )

static void *lsmWin32OsMalloc(lsm_env *pEnv, size_t N){
  unsigned char * m;
  N += BLOCK_HDR_SIZE;
  m = (unsigned char *)malloc(N);
  *((size_t*)m) = N;
  return m + BLOCK_HDR_SIZE;

}

static void lsmWin32OsFree(lsm_env *pEnv, void *p){
  if(p){
    free( ((unsigned char *)p) - BLOCK_HDR_SIZE );
  }
}

static void *lsmWin32OsRealloc(lsm_env *pEnv, void *p, size_t N){
  unsigned char * m = (unsigned char *)p;
  if(1>N){
    lsmWin32OsFree( pEnv, p );
    return NULL;
  }else if(NULL==p){
    return lsmWin32OsMalloc(pEnv, N);
  }else{
    void * re = NULL;
    m -= BLOCK_HDR_SIZE;
#if 0 /* arguable: don't shrink */
    size_t * sz = (size_t*)m;
    if(*sz >= (size_t)N){


      return p;
    }
#endif
    re = realloc( m, N + BLOCK_HDR_SIZE );
    if(re){
      m = (unsigned char *)re;
      *((size_t*)m) = N;
      return m + BLOCK_HDR_SIZE;
    }else{
      return NULL;
    }
  }
}

static size_t lsmWin32OsMSize(lsm_env *pEnv, void *p){
  unsigned char * m = (unsigned char *)p;
  return *((size_t*)(m-BLOCK_HDR_SIZE));
}
#undef BLOCK_HDR_SIZE


#ifdef LSM_MUTEX_WIN32 
/*************************************************************************
** Mutex methods for pthreads based systems.  If LSM_MUTEX_WIN32 is
** missing then a no-op implementation of mutexes found below will be 
** used instead.
*/
#include <pthread.h>

typedef struct PthreadMutex PthreadMutex;
struct PthreadMutex {

  lsm_env *pEnv;
  pthread_mutex_t mutex;

#ifdef LSM_DEBUG
  pthread_t owner;
#endif
};





#ifdef LSM_DEBUG
# define LSM_PTHREAD_STATIC_MUTEX { 0, PTHREAD_MUTEX_INITIALIZER, 0 }

#else
# define LSM_PTHREAD_STATIC_MUTEX { 0, PTHREAD_MUTEX_INITIALIZER }

#endif

static int lsmWin32OsMutexStatic(
  lsm_env *pEnv,
  int iMutex,
  lsm_mutex **ppStatic
){

  static PthreadMutex sMutex[2] = {
    LSM_PTHREAD_STATIC_MUTEX,
    LSM_PTHREAD_STATIC_MUTEX
  };

  assert( iMutex==LSM_MUTEX_GLOBAL || iMutex==LSM_MUTEX_HEAP );
  assert( LSM_MUTEX_GLOBAL==1 && LSM_MUTEX_HEAP==2 );







  *ppStatic = (lsm_mutex *)&sMutex[iMutex-1];
  return LSM_OK;
}

static int lsmWin32OsMutexNew(lsm_env *pEnv, lsm_mutex **ppNew){
  PthreadMutex *pMutex;           /* Pointer to new mutex */
  pthread_mutexattr_t attr;       /* Attributes object */

  pMutex = (PthreadMutex *)lsmMallocZero(pEnv, sizeof(PthreadMutex));
  if( !pMutex ) return LSM_NOMEM_BKPT;

  pMutex->pEnv = pEnv;
  pthread_mutexattr_init(&attr);
  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
  pthread_mutex_init(&pMutex->mutex, &attr);
  pthread_mutexattr_destroy(&attr);

  *ppNew = (lsm_mutex *)pMutex;
  return LSM_OK;
}

static void lsmWin32OsMutexDel(lsm_mutex *p){
  PthreadMutex *pMutex = (PthreadMutex *)p;
  pthread_mutex_destroy(&pMutex->mutex);
  lsmFree(pMutex->pEnv, pMutex);
}

static void lsmWin32OsMutexEnter(lsm_mutex *p){
  PthreadMutex *pMutex = (PthreadMutex *)p;
  pthread_mutex_lock(&pMutex->mutex);

#ifdef LSM_DEBUG
  assert( !pthread_equal(pMutex->owner, pthread_self()) );
  pMutex->owner = pthread_self();
  assert( pthread_equal(pMutex->owner, pthread_self()) );
#endif
}

static int lsmWin32OsMutexTry(lsm_mutex *p){
  int ret;
  PthreadMutex *pMutex = (PthreadMutex *)p;
  ret = pthread_mutex_trylock(&pMutex->mutex);
#ifdef LSM_DEBUG
  if( ret==0 ){
    assert( !pthread_equal(pMutex->owner, pthread_self()) );
    pMutex->owner = pthread_self();
    assert( pthread_equal(pMutex->owner, pthread_self()) );
  }
#endif
  return ret;
}

static void lsmWin32OsMutexLeave(lsm_mutex *p){
  PthreadMutex *pMutex = (PthreadMutex *)p;
#ifdef LSM_DEBUG
  assert( pthread_equal(pMutex->owner, pthread_self()) );
  pMutex->owner = 0;
  assert( !pthread_equal(pMutex->owner, pthread_self()) );
#endif
  pthread_mutex_unlock(&pMutex->mutex);
}

#ifdef LSM_DEBUG
static int lsmWin32OsMutexHeld(lsm_mutex *p){
  PthreadMutex *pMutex = (PthreadMutex *)p;
  return pMutex ? pthread_equal(pMutex->owner, pthread_self()) : 1;
}
static int lsmWin32OsMutexNotHeld(lsm_mutex *p){
  PthreadMutex *pMutex = (PthreadMutex *)p;
  return pMutex ? !pthread_equal(pMutex->owner, pthread_self()) : 1;
}
#endif
/*
** End of pthreads mutex implementation.
*************************************************************************/
#else
/*************************************************************************
................................................................................
static int lsmWin32OsMutexNew(lsm_env *pEnv, lsm_mutex **ppNew){
  NoopMutex *p;
  p = (NoopMutex *)lsmMallocZero(pEnv, sizeof(NoopMutex));
  if( p ) p->pEnv = pEnv;
  *ppNew = (lsm_mutex *)p;
  return (p ? LSM_OK : LSM_NOMEM_BKPT);
}
static void lsmWin32OsMutexDel(lsm_mutex *pMutex)  { 
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bStatic==0 && p->pEnv );
  lsmFree(p->pEnv, p);
}
static void lsmWin32OsMutexEnter(lsm_mutex *pMutex){ 
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bHeld==0 );
  p->bHeld = 1;
}
static int lsmWin32OsMutexTry(lsm_mutex *pMutex){
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bHeld==0 );
  p->bHeld = 1;
  return 0;
}
static void lsmWin32OsMutexLeave(lsm_mutex *pMutex){ 
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bHeld==1 );
  p->bHeld = 0;
}
#ifdef LSM_DEBUG
static int lsmWin32OsMutexHeld(lsm_mutex *pMutex){ 
  NoopMutex *p = (NoopMutex *)pMutex;
  return p ? p->bHeld : 1;
}
static int lsmWin32OsMutexNotHeld(lsm_mutex *pMutex){ 
  NoopMutex *p = (NoopMutex *)pMutex;
  return p ? !p->bHeld : 1;
}
#endif
/***************************************************************************/
#endif /* else LSM_MUTEX_NONE */








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**
**    May you do good and not evil.
**    May you find forgiveness for yourself and forgive others.
**    May you share freely, never taking more than you give.
**
*************************************************************************
**
** Win32-specific run-time environment implementation for LSM.
*/

#ifdef _WIN32













#include <assert.h>
#include <string.h>

#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <ctype.h>

#include "windows.h"


#include "lsmInt.h"

/*
** An open file is an instance of the following object
*/
typedef struct Win32File Win32File;
struct Win32File {
  lsm_env *pEnv;                  /* The run-time environment */
  const char *zName;              /* Full path to file */

  HANDLE hFile;                   /* Open file handle */
  HANDLE hShmFile;                /* File handle for *-shm file */

  HANDLE hMap;                    /* File handle for mapping */
  void *pMap;                     /* Pointer to mapping of file fd */
  size_t nMap;                    /* Size of mapping at pMap in bytes */
  int nShm;                       /* Number of entries in array apShm[] */
  void **apShm;                   /* Array of 32K shared memory segments */
};

int lsmWin32OsSleep(lsm_env *pEnv, int us);

static char *win32ShmFile(Win32File *p){
  char *zShm;
  int nName = strlen(p->zName);
  zShm = (char *)lsmMallocZero(p->pEnv, nName+4+1);
  if( zShm ){
    memcpy(zShm, p->zName, nName);
    memcpy(&zShm[nName], "-shm", 5);
  }
  return zShm;
}

/*
** The number of times that an I/O operation will be retried following a
** locking error - probably caused by antivirus software.  Also the initial
** delay before the first retry.  The delay increases linearly with each
** retry.
*/
#ifndef LSM_WIN32_IOERR_RETRY
# define LSM_WIN32_IOERR_RETRY 10
#endif
#ifndef LSM_WIN32_IOERR_RETRY_DELAY
# define LSM_WIN32_IOERR_RETRY_DELAY 25000
#endif
static int win32IoerrRetry = LSM_WIN32_IOERR_RETRY;
static int win32IoerrRetryDelay = LSM_WIN32_IOERR_RETRY_DELAY;

/*
** The "win32IoerrCanRetry1" macro is used to determine if a particular
** I/O error code obtained via GetLastError() is eligible to be retried.
** It must accept the error code DWORD as its only argument and should
** return non-zero if the error code is transient in nature and the
** operation responsible for generating the original error might succeed
** upon being retried.  The argument to this macro should be a variable.
**
** Additionally, a macro named "win32IoerrCanRetry2" may be defined.  If
** it is defined, it will be consulted only when the macro
** "win32IoerrCanRetry1" returns zero.  The "win32IoerrCanRetry2" macro
** is completely optional and may be used to include additional error
** codes in the set that should result in the failing I/O operation being
** retried by the caller.  If defined, the "win32IoerrCanRetry2" macro
** must exhibit external semantics identical to those of the
** "win32IoerrCanRetry1" macro.
*/
#if !defined(win32IoerrCanRetry1)
#define win32IoerrCanRetry1(a) (((a)==ERROR_ACCESS_DENIED)        || \
                                ((a)==ERROR_SHARING_VIOLATION)    || \
                                ((a)==ERROR_LOCK_VIOLATION)       || \
                                ((a)==ERROR_DEV_NOT_EXIST)        || \
                                ((a)==ERROR_NETNAME_DELETED)      || \
                                ((a)==ERROR_SEM_TIMEOUT)          || \
                                ((a)==ERROR_NETWORK_UNREACHABLE))
#endif

/*
** If an I/O error occurs, invoke this routine to see if it should be
** retried.  Return TRUE to retry.  Return FALSE to give up with an
** error.
*/
static int win32RetryIoerr(
  lsm_env *pEnv,
  int *pnRetry
){
  DWORD lastErrno;
  if( *pnRetry>=win32IoerrRetry ){
    return 0;
  }
  lastErrno = GetLastError();
  if( win32IoerrCanRetry1(lastErrno) ){
    lsmWin32OsSleep(pEnv, win32IoerrRetryDelay*(1+*pnRetry));
    ++*pnRetry;
    return 1;
  }
#if defined(win32IoerrCanRetry2)
  else if( win32IoerrCanRetry2(lastErrno) ){
    lsmWin32OsSleep(pEnv, win32IoerrRetryDelay*(1+*pnRetry));
    ++*pnRetry;
    return 1;
  }
#endif
  return 0;
}

/*
** Convert a UTF-8 string to Microsoft Unicode.
**
** Space to hold the returned string is obtained from lsmMalloc().
*/
static LPWSTR win32Utf8ToUnicode(lsm_env *pEnv, const char *zText){
  int nChar;
  LPWSTR zWideText;

  nChar = MultiByteToWideChar(CP_UTF8, 0, zText, -1, NULL, 0);
  if( nChar==0 ){
    return 0;
  }
  zWideText = lsmMallocZero(pEnv, nChar * sizeof(WCHAR));
  if( zWideText==0 ){
    return 0;
  }
  nChar = MultiByteToWideChar(CP_UTF8, 0, zText, -1, zWideText, nChar);
  if( nChar==0 ){
    lsmFree(pEnv, zWideText);
    zWideText = 0;
  }
  return zWideText;
}

#if !defined(win32IsNotFound)
#define win32IsNotFound(a) (((a)==ERROR_FILE_NOT_FOUND)  || \
                            ((a)==ERROR_PATH_NOT_FOUND))
#endif

static int lsmWin32OsOpen(
  lsm_env *pEnv,
  const char *zFile,
  int flags,
  lsm_file **ppFile
){
  int rc = LSM_OK;
  Win32File *pWin32File;

  pWin32File = lsmMallocZero(pEnv, sizeof(Win32File));

  if( pWin32File==0 ){
    rc = LSM_NOMEM_BKPT;
  }else{
    LPCWSTR zConverted;
    int bReadonly = (flags & LSM_OPEN_READONLY);

    DWORD dwDesiredAccess;
    DWORD dwShareMode = FILE_SHARE_READ | FILE_SHARE_WRITE;
    DWORD dwCreationDisposition;
    DWORD dwFlagsAndAttributes = FILE_ATTRIBUTE_NORMAL;
    HANDLE hFile;

    zConverted = win32Utf8ToUnicode(pEnv, zFile);
    if( zConverted==0 ){
      lsmFree(pEnv, pWin32File);
      pWin32File = 0;


      rc = LSM_NOMEM_BKPT;
    }else{
      int nRetry = 0;
      if( bReadonly ){
        dwDesiredAccess = GENERIC_READ;
        dwCreationDisposition = OPEN_EXISTING;
      }else{
        dwDesiredAccess = GENERIC_READ | GENERIC_WRITE;
        dwCreationDisposition = OPEN_ALWAYS;
      }
      while( (hFile = CreateFileW((LPCWSTR)zConverted,
                                  dwDesiredAccess,
                                  dwShareMode, NULL,
                                  dwCreationDisposition,
                                  dwFlagsAndAttributes,
                                  NULL))==INVALID_HANDLE_VALUE &&

                                  win32RetryIoerr(pEnv, &nRetry) ){
        /* Noop */
      }



      if( hFile!=INVALID_HANDLE_VALUE ){
        pWin32File->pEnv = pEnv;
        pWin32File->zName = zFile;
        pWin32File->hFile = hFile;
      }else{
        lsmFree(pEnv, pWin32File);
        pWin32File = 0;

        if( win32IsNotFound(GetLastError()) ){
          rc = lsmErrorBkpt(LSM_IOERR_NOENT);
        }else{
          rc = LSM_IOERR_BKPT;
        }
      }
    }
  }

  *ppFile = (lsm_file *)pWin32File;
  return rc;
}

static int lsmWin32OsWrite(
  lsm_file *pFile, /* File to write to */
  lsm_i64 iOff,    /* Offset to write to */
  void *pData,     /* Write data from this buffer */
  int nData        /* Bytes of data to write */
){

  Win32File *pWin32File = (Win32File *)pFile;
  OVERLAPPED overlapped;  /* The offset for WriteFile. */
  u8 *aRem = (u8 *)pData; /* Data yet to be written */
  int nRem = nData;       /* Number of bytes yet to be written */
  int nRetry = 0;         /* Number of retrys */



  memset(&overlapped, 0, sizeof(OVERLAPPED));
  overlapped.Offset = (LONG)(iOff & 0xffffffff);
  overlapped.OffsetHigh = (LONG)((iOff>>32) & 0x7fffffff);
  while( nRem>0 ){
    DWORD nWrite = 0; /* Bytes written using WriteFile */
    if( !WriteFile(pWin32File->hFile, aRem, nRem, &nWrite, &overlapped) ){
      if( win32RetryIoerr(pWin32File->pEnv, &nRetry) ) continue;
      break;
    }
    assert( nWrite==0 || nWrite<=(DWORD)nRem );
    if( nWrite==0 || nWrite>(DWORD)nRem ){
      break;
    }
    iOff += nWrite;
    overlapped.Offset = (LONG)(iOff & 0xffffffff);
    overlapped.OffsetHigh = (LONG)((iOff>>32) & 0x7fffffff);
    aRem += nWrite;
    nRem -= nWrite;
  }
  if( nRem!=0 ) return LSM_IOERR_BKPT;
  return LSM_OK;
}

static int lsmWin32OsTruncate(
  lsm_file *pFile, /* File to write to */
  lsm_i64 nSize    /* Size to truncate file to */
){
  Win32File *pWin32File = (Win32File *)pFile;
  LARGE_INTEGER largeInteger; /* The new offset */



  largeInteger.QuadPart = nSize;
  if( !SetFilePointerEx(pWin32File->hFile, largeInteger, 0, FILE_BEGIN) ){
    return LSM_IOERR_BKPT;


  }
  if (!SetEndOfFile(pWin32File->hFile) ){
    return LSM_IOERR_BKPT;
  }
  return LSM_OK;
}

static int lsmWin32OsRead(
  lsm_file *pFile, /* File to read from */
  lsm_i64 iOff,    /* Offset to read from */
  void *pData,     /* Read data into this buffer */
  int nData        /* Bytes of data to read */
){
  Win32File *pWin32File = (Win32File *)pFile;
  OVERLAPPED overlapped; /* The offset for ReadFile */
  DWORD nRead = 0;       /* Bytes read using ReadFile */
  int nRetry = 0;        /* Number of retrys */

  memset(&overlapped, 0, sizeof(OVERLAPPED));
  overlapped.Offset = (LONG)(iOff & 0xffffffff);
  overlapped.OffsetHigh = (LONG)((iOff>>32) & 0x7fffffff);
  while( !ReadFile(pWin32File->hFile, pData, nData, &nRead, &overlapped) &&
         GetLastError()!=ERROR_HANDLE_EOF ){
    if( win32RetryIoerr(pWin32File->pEnv, &nRetry) ) continue;
    return LSM_IOERR_BKPT;
  }
  if( nRead<(DWORD)nData ){
    /* Unread parts of the buffer must be zero-filled */
    memset(&((char*)pData)[nRead], 0, nData - nRead);
  }
  return LSM_OK;
}

static int lsmWin32OsSync(lsm_file *pFile){
  int rc = LSM_OK;

#ifndef LSM_NO_SYNC
  Win32File *pWin32File = (Win32File *)pFile;

  if( pWin32File->pMap ){
    if( !FlushViewOfFile(pWin32File->pMap, 0) ){
      rc = LSM_IOERR_BKPT;
    }
  }
  if( rc==LSM_OK && !FlushFileBuffers(pWin32File->hFile) ){
    rc = LSM_IOERR_BKPT;
  }
#else
#endif

  return rc;
}

static int lsmWin32OsSectorSize(lsm_file *pFile){
  return 512;
}

static int lsmWin32OsRemap(
  lsm_file *pFile,
  lsm_i64 iMin,
  void **ppOut,
  lsm_i64 *pnOut
){

































  return LSM_ERROR;
}

static int lsmWin32OsFullpath(
  lsm_env *pEnv,
  const char *zName,
  char *zOut,
  int *pnOut
){


































  return LSM_ERROR;
}

static int lsmWin32OsFileid(
  lsm_file *pFile,
  void *pBuf,
  int *pnBuf
){

  int nBuf;
  int nReq;
  u8 *pBuf2 = (u8 *)pBuf;
  Win32File *pWin32File = (Win32File *)pFile;
  BY_HANDLE_FILE_INFORMATION fileInfo;

  nBuf = *pnBuf;
  nReq = (sizeof(fileInfo.dwVolumeSerialNumber) +
          sizeof(fileInfo.nFileIndexHigh) +
          sizeof(fileInfo.nFileIndexLow));
  *pnBuf = nReq;
  if( nReq>nBuf ) return LSM_OK;


  memset(&fileInfo, 0, sizeof(BY_HANDLE_FILE_INFORMATION));
  if( !GetFileInformationByHandle(pWin32File->hFile, &fileInfo) ){
    return LSM_IOERR_BKPT;
  }

  nReq = sizeof(fileInfo.dwVolumeSerialNumber);
  memcpy(pBuf2, &fileInfo.dwVolumeSerialNumber, nReq);
  pBuf2 += nReq;
  nReq = sizeof(fileInfo.nFileIndexHigh);
  memcpy(pBuf, &fileInfo.nFileIndexHigh, nReq);
  pBuf2 += nReq;
  nReq = sizeof(fileInfo.nFileIndexLow);
  memcpy(pBuf2, &fileInfo.nFileIndexLow, nReq);
  return LSM_OK;
}

static int lsmWin32OsUnlink(lsm_env *pEnv, const char *zFile){
  return LSM_ERROR;

}

int lsmWin32OsLock(lsm_file *pFile, int iLock, int eType){


























  return LSM_ERROR;
}

int lsmWin32OsTestLock(lsm_file *pFile, int iLock, int nLock, int eType){























  return LSM_ERROR;
}

int lsmWin32OsShmMap(lsm_file *pFile, int iChunk, int sz, void **ppShm){


















































  return LSM_ERROR;
}

void lsmWin32OsShmBarrier(void){
  MemoryBarrier();
}

int lsmWin32OsShmUnmap(lsm_file *pFile, int bDelete){







  return LSM_ERROR;
}







#define MX_CLOSE_ATTEMPT 3
static int lsmWin32OsClose(lsm_file *pFile){
  int rc;
  int nRetry = 0;
  Win32File *pWin32File = (Win32File *)pFile;
  lsmWin32OsShmUnmap(pFile, 0);
  if( pWin32File->pMap ){
    UnmapViewOfFile(pWin32File->pMap);
    pWin32File->pMap = 0;
  }
  if( pWin32File->hMap!=NULL ){
    CloseHandle(pWin32File->hMap);
    pWin32File->hMap = NULL;
  }
  do{
    rc = CloseHandle(pWin32File->hFile);
    if( rc ){
      rc = LSM_OK;
      break;
    }
    if( ++nRetry>=MX_CLOSE_ATTEMPT ){
      rc = LSM_IOERR_BKPT;
      break;
    }








  }while( 1 );
  lsmFree(pWin32File->pEnv, pWin32File->apShm);
  lsmFree(pWin32File->pEnv, pWin32File);
  return rc;
}

static int lsmWin32OsSleep(lsm_env *pEnv, int us){

  unused_parameter(pEnv);
  Sleep((us + 999) / 1000);
  return LSM_OK;
}

/****************************************************************************
** Memory allocation routines.
*/


static void *lsmWin32OsMalloc(lsm_env *pEnv, size_t N){





  return HeapAlloc(GetProcessHeap(), 0, (SIZE_T)N);
}

static void lsmWin32OsFree(lsm_env *pEnv, void *p){
  if( p ){
    HeapFree(GetProcessHeap(), 0, p);
  }
}

static void *lsmWin32OsRealloc(lsm_env *pEnv, void *p, size_t N){
  unsigned char *m = (unsigned char *)p;
  if( 1>N ){
    lsmWin32OsFree(pEnv, p);
    return NULL;
  }else if( NULL==p ){
    return lsmWin32OsMalloc(pEnv, N);
  }else{


#if 0 /* arguable: don't shrink */


    SIZE_T sz = HeapSize(GetProcessHeap(), 0, m);
    if( sz>=(SIZE_T)N ){
      return p;
    }
#endif
    return HeapReAlloc(GetProcessHeap(), 0, m, N);







  }
}

static size_t lsmWin32OsMSize(lsm_env *pEnv, void *p){
  return (size_t)HeapSize(GetProcessHeap(), 0, p);

}



#ifdef LSM_MUTEX_WIN32
/*************************************************************************
** Mutex methods for Win32 based systems.  If LSM_MUTEX_WIN32 is
** missing then a no-op implementation of mutexes found below will be
** used instead.
*/
#include "windows.h"

typedef struct Win32Mutex Win32Mutex;

struct Win32Mutex {
  lsm_env *pEnv;

  CRITICAL_SECTION mutex;
#ifdef LSM_DEBUG
  DWORD owner;
#endif
};

#ifndef WIN32_MUTEX_INITIALIZER
# define WIN32_MUTEX_INITIALIZER { 0 }
#endif

#ifdef LSM_DEBUG

# define LSM_WIN32_STATIC_MUTEX { 0, WIN32_MUTEX_INITIALIZER, 0 }
#else

# define LSM_WIN32_STATIC_MUTEX { 0, WIN32_MUTEX_INITIALIZER }
#endif

static int lsmWin32OsMutexStatic(
  lsm_env *pEnv,
  int iMutex,
  lsm_mutex **ppStatic
){
  static volatile LONG initialized = 0;
  static Win32Mutex sMutex[2] = {
    LSM_WIN32_STATIC_MUTEX,
    LSM_WIN32_STATIC_MUTEX
  };

  assert( iMutex==LSM_MUTEX_GLOBAL || iMutex==LSM_MUTEX_HEAP );
  assert( LSM_MUTEX_GLOBAL==1 && LSM_MUTEX_HEAP==2 );

  if( InterlockedCompareExchange(&initialized, 1, 0)==0 ){
    int i;
    for(i=0; i<array_size(sMutex); i++){
      InitializeCriticalSection(&sMutex[i].mutex);
    }
  }
  *ppStatic = (lsm_mutex *)&sMutex[iMutex-1];
  return LSM_OK;
}

static int lsmWin32OsMutexNew(lsm_env *pEnv, lsm_mutex **ppNew){
  Win32Mutex *pMutex;           /* Pointer to new mutex */


  pMutex = (Win32Mutex *)lsmMallocZero(pEnv, sizeof(Win32Mutex));
  if( !pMutex ) return LSM_NOMEM_BKPT;

  pMutex->pEnv = pEnv;
  InitializeCriticalSection(&pMutex->mutex);




  *ppNew = (lsm_mutex *)pMutex;
  return LSM_OK;
}

static void lsmWin32OsMutexDel(lsm_mutex *p){
  Win32Mutex *pMutex = (Win32Mutex *)p;
  DeleteCriticalSection(&pMutex->mutex);
  lsmFree(pMutex->pEnv, pMutex);
}

static void lsmWin32OsMutexEnter(lsm_mutex *p){
  Win32Mutex *pMutex = (Win32Mutex *)p;
  EnterCriticalSection(&pMutex->mutex);

#ifdef LSM_DEBUG
  assert( pMutex->owner!=GetCurrentThreadId() );
  pMutex->owner = GetCurrentThreadId();
  assert( pMutex->owner==GetCurrentThreadId() );
#endif
}

static int lsmWin32OsMutexTry(lsm_mutex *p){
  BOOL bRet;
  Win32Mutex *pMutex = (Win32Mutex *)p;
  bRet = TryEnterCriticalSection(&pMutex->mutex);
#ifdef LSM_DEBUG
  if( bRet ){
    assert( pMutex->owner!=GetCurrentThreadId() );
    pMutex->owner = GetCurrentThreadId();
    assert( pMutex->owner==GetCurrentThreadId() );
  }
#endif
  return !bRet;
}

static void lsmWin32OsMutexLeave(lsm_mutex *p){
  Win32Mutex *pMutex = (Win32Mutex *)p;
#ifdef LSM_DEBUG
  assert( pMutex->owner==GetCurrentThreadId() );
  pMutex->owner = 0;
  assert( pMutex->owner!=GetCurrentThreadId() );
#endif
  LeaveCriticalSection(&pMutex->mutex);
}

#ifdef LSM_DEBUG
static int lsmWin32OsMutexHeld(lsm_mutex *p){
  Win32Mutex *pMutex = (Win32Mutex *)p;
  return pMutex ? pMutex->owner==GetCurrentThreadId() : 1;
}
static int lsmWin32OsMutexNotHeld(lsm_mutex *p){
  Win32Mutex *pMutex = (Win32Mutex *)p;
  return pMutex ? pMutex->owner!=GetCurrentThreadId() : 1;
}
#endif
/*
** End of pthreads mutex implementation.
*************************************************************************/
#else
/*************************************************************************
................................................................................
static int lsmWin32OsMutexNew(lsm_env *pEnv, lsm_mutex **ppNew){
  NoopMutex *p;
  p = (NoopMutex *)lsmMallocZero(pEnv, sizeof(NoopMutex));
  if( p ) p->pEnv = pEnv;
  *ppNew = (lsm_mutex *)p;
  return (p ? LSM_OK : LSM_NOMEM_BKPT);
}
static void lsmWin32OsMutexDel(lsm_mutex *pMutex)  {
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bStatic==0 && p->pEnv );
  lsmFree(p->pEnv, p);
}
static void lsmWin32OsMutexEnter(lsm_mutex *pMutex){
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bHeld==0 );
  p->bHeld = 1;
}
static int lsmWin32OsMutexTry(lsm_mutex *pMutex){
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bHeld==0 );
  p->bHeld = 1;
  return 0;
}
static void lsmWin32OsMutexLeave(lsm_mutex *pMutex){
  NoopMutex *p = (NoopMutex *)pMutex;
  assert( p->bHeld==1 );
  p->bHeld = 0;
}
#ifdef LSM_DEBUG
static int lsmWin32OsMutexHeld(lsm_mutex *pMutex){
  NoopMutex *p = (NoopMutex *)pMutex;
  return p ? p->bHeld : 1;
}
static int lsmWin32OsMutexNotHeld(lsm_mutex *pMutex){
  NoopMutex *p = (NoopMutex *)pMutex;
  return p ? !p->bHeld : 1;
}
#endif
/***************************************************************************/
#endif /* else LSM_MUTEX_NONE */