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SQLite training in Houston TX on 2019-11-05 (details)
Part of the 2019 Tcl Conference

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Overview
Comment:Second thoughts: Let Tiger users set SQLITE_ENABLE_LOCKING_STYLE=0. Was: Change SQLITE_ENABLE_LOCKING_STYLE to default off, even on Macs, since older Macs (Tiger) cannot compile the latest proxy locking sources.
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SHA1: 1a0fa8d19d69d4ecaaaa879ac3c893980375fcc6
User & Date: drh 2010-03-04 22:36:45
Original Comment: Change SQLITE_ENABLE_LOCKING_STYLE to default off, even on Macs, since older Macs (Tiger) cannot compile the latest proxy locking sources.
Context
2010-03-04
22:36
Second thoughts: Let Tiger users set SQLITE_ENABLE_LOCKING_STYLE=0. Was: Change SQLITE_ENABLE_LOCKING_STYLE to default off, even on Macs, since older Macs (Tiger) cannot compile the latest proxy locking sources. Closed-Leaf check-in: 1a0fa8d1 user: drh tags: mistake
17:58
Fix for [9abd6aa831]. Do not overread a buffer used for an %q or %w conversion with a precision specifier. check-in: 5e472896 user: dan tags: trunk
Changes
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Changes to src/os_unix.c. 

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** Styles 4, 5, and 7 are only available of SQLITE_ENABLE_LOCKING_STYLE
** is defined to 1.  The SQLITE_ENABLE_LOCKING_STYLE also enables automatic
** selection of the appropriate locking style based on the filesystem
** where the database is located.  
*/
#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
#  if defined(__APPLE__)
#    define SQLITE_ENABLE_LOCKING_STYLE 1
#  else
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  endif
#endif

/*
** Define the OS_VXWORKS pre-processor macro to 1 if building on 
................................................................................
#  include <limits.h>
# else
#  include <sys/file.h>
#  include <sys/param.h>
#  include <sys/mount.h>
# endif
#endif /* SQLITE_ENABLE_LOCKING_STYLE */





/*
** Allowed values of unixFile.fsFlags
*/
#define SQLITE_FSFLAGS_IS_MSDOS     0x1

/*
................................................................................
end_create_proxy:    
  close(fd); /* silently leak fd if error, we're already in error */
  sqlite3_free(pNew);
  sqlite3_free(pUnused);
  return rc;
}

#ifdef SQLITE_TEST
/* simulate multiple hosts by creating unique hostid file paths */
int sqlite3_hostid_num = 0;
#endif

#define PROXY_HOSTIDLEN    16  /* conch file host id length */

/* get the host ID via gethostuuid(), pHostID must point to PROXY_HOSTIDLEN 








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** Styles 4, 5, and 7 are only available of SQLITE_ENABLE_LOCKING_STYLE
** is defined to 1.  The SQLITE_ENABLE_LOCKING_STYLE also enables automatic
** selection of the appropriate locking style based on the filesystem
** where the database is located.  
*/
#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
#  if defined(__APPLE__)
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  else
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  endif
#endif

/*
** Define the OS_VXWORKS pre-processor macro to 1 if building on 
................................................................................
#  include <limits.h>
# else
#  include <sys/file.h>
#  include <sys/param.h>
#  include <sys/mount.h>
# endif
#endif /* SQLITE_ENABLE_LOCKING_STYLE */

#ifdef __APPLE__
# include <sys/mount.h>
#endif

/*
** Allowed values of unixFile.fsFlags
*/
#define SQLITE_FSFLAGS_IS_MSDOS     0x1

/*
................................................................................
end_create_proxy:    
  close(fd); /* silently leak fd if error, we're already in error */
  sqlite3_free(pNew);
  sqlite3_free(pUnused);
  return rc;
}

#if defined(SQLITE_TEST) && defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
/* simulate multiple hosts by creating unique hostid file paths */
int sqlite3_hostid_num = 0;
#endif

#define PROXY_HOSTIDLEN    16  /* conch file host id length */

/* get the host ID via gethostuuid(), pHostID must point to PROXY_HOSTIDLEN

Changes to src/test1.c. 

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  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ){
   return TCL_ERROR;
  }
  
#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
#  if defined(__APPLE__)
#    define SQLITE_ENABLE_LOCKING_STYLE 1
#  else
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  endif
#endif
#if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)
  {
    char *proxyPath = "test.proxy";
................................................................................
int Sqlitetest1_Init(Tcl_Interp *interp){
  extern int sqlite3_search_count;
  extern int sqlite3_found_count;
  extern int sqlite3_interrupt_count;
  extern int sqlite3_open_file_count;
  extern int sqlite3_sort_count;
  extern int sqlite3_current_time;
#if SQLITE_OS_UNIX && defined(__APPLE__)
  extern int sqlite3_hostid_num;
#endif
  extern int sqlite3_max_blobsize;
  extern int sqlite3BtreeSharedCacheReport(void*,
                                          Tcl_Interp*,int,Tcl_Obj*CONST*);
  static struct {
     char *zName;
................................................................................
      (char*)&sqlite3_like_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_interrupt_count", 
      (char*)&sqlite3_interrupt_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_open_file_count", 
      (char*)&sqlite3_open_file_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_current_time", 
      (char*)&sqlite3_current_time, TCL_LINK_INT);
#if SQLITE_OS_UNIX && defined(__APPLE__)
  Tcl_LinkVar(interp, "sqlite_hostid_num", 
      (char*)&sqlite3_hostid_num, TCL_LINK_INT);
#endif
  Tcl_LinkVar(interp, "sqlite3_xferopt_count",
      (char*)&sqlite3_xferopt_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_pager_readdb_count",
      (char*)&sqlite3_pager_readdb_count, TCL_LINK_INT);








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  }
  if( getDbPointer(interp, Tcl_GetString(objv[1]), &db) ){
   return TCL_ERROR;
  }
  
#if !defined(SQLITE_ENABLE_LOCKING_STYLE)
#  if defined(__APPLE__)
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  else
#    define SQLITE_ENABLE_LOCKING_STYLE 0
#  endif
#endif
#if SQLITE_ENABLE_LOCKING_STYLE && defined(__APPLE__)
  {
    char *proxyPath = "test.proxy";
................................................................................
int Sqlitetest1_Init(Tcl_Interp *interp){
  extern int sqlite3_search_count;
  extern int sqlite3_found_count;
  extern int sqlite3_interrupt_count;
  extern int sqlite3_open_file_count;
  extern int sqlite3_sort_count;
  extern int sqlite3_current_time;
#if SQLITE_OS_UNIX && defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
  extern int sqlite3_hostid_num;
#endif
  extern int sqlite3_max_blobsize;
  extern int sqlite3BtreeSharedCacheReport(void*,
                                          Tcl_Interp*,int,Tcl_Obj*CONST*);
  static struct {
     char *zName;
................................................................................
      (char*)&sqlite3_like_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_interrupt_count", 
      (char*)&sqlite3_interrupt_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_open_file_count", 
      (char*)&sqlite3_open_file_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite_current_time", 
      (char*)&sqlite3_current_time, TCL_LINK_INT);
#if SQLITE_OS_UNIX && defined(__APPLE__) && SQLITE_ENABLE_LOCKING_STYLE
  Tcl_LinkVar(interp, "sqlite_hostid_num", 
      (char*)&sqlite3_hostid_num, TCL_LINK_INT);
#endif
  Tcl_LinkVar(interp, "sqlite3_xferopt_count",
      (char*)&sqlite3_xferopt_count, TCL_LINK_INT);
  Tcl_LinkVar(interp, "sqlite3_pager_readdb_count",
      (char*)&sqlite3_pager_readdb_count, TCL_LINK_INT);

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