src/os_common.h

   1 /*
   2 ** 2004 May 22
   3 **
   4 ** The author disclaims copyright to this source code.  In place of
   5 ** a legal notice, here is a blessing:
   6 **
   7 **    May you do good and not evil.
   8 **    May you find forgiveness for yourself and forgive others.
   9 **    May you share freely, never taking more than you give.
  10 **
  11 ******************************************************************************
  12 **
  13 ** This file contains macros and a little bit of code that is common to
  14 ** all of the platform-specific files (os_*.c) and is #included into those
  15 ** files.
  16 **
  17 ** This file should be #included by the os_*.c files only.  It is not a
  18 ** general purpose header file.
  19 */
  20 #ifndef _OS_COMMON_H_
  21 #define _OS_COMMON_H_
  22
  23 /*
  24 ** At least two bugs have slipped in because we changed the MEMORY_DEBUG
  25 ** macro to SQLITE_DEBUG and some older makefiles have not yet made the
  26 ** switch.  The following code should catch this problem at compile-time.
  27 */
  28 #ifdef MEMORY_DEBUG
  29 # error "The MEMORY_DEBUG macro is obsolete.  Use SQLITE_DEBUG instead."
  30 #endif
  31
  32 /*
  33 ** Macros for performance tracing.  Normally turned off.  Only works
  34 ** on i486 hardware.
  35 */
  36 #ifdef SQLITE_PERFORMANCE_TRACE
  37
  38 static sqlite_uint64 g_start;
  39 static sqlite_uint64 g_elapsed;
  40 #define TIMER_START       g_start=sqlite3Hwtime()
  41 #define TIMER_END         g_elapsed=sqlite3Hwtime()-g_start
  42 #define TIMER_ELAPSED     g_elapsed
  43 #else
  44 #define TIMER_START
  45 #define TIMER_END
  46 #define TIMER_ELAPSED     ((sqlite_uint64)0)
  47 #endif
  48
  49 /*
  50 ** If we compile with the SQLITE_TEST macro set, then the following block
  51 ** of code will give us the ability to simulate a disk I/O error.  This
  52 ** is used for testing the I/O recovery logic.
  53 */
  54 #if defined(SQLITE_TEST)
  55 extern int sqlite3_io_error_hit;
  56 extern int sqlite3_io_error_hardhit;
  57 extern int sqlite3_io_error_pending;
  58 extern int sqlite3_io_error_persist;
  59 extern int sqlite3_io_error_benign;
  60 extern int sqlite3_diskfull_pending;
  61 extern int sqlite3_diskfull;
  62 #define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)
  63 #define SimulateIOError(CODE)  \
  64   if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \
  65        || sqlite3_io_error_pending-- == 1 )  \
  66               { local_ioerr(); CODE; }
  67 static void local_ioerr(){
  68   IOTRACE(("IOERR\n"));
  69   sqlite3_io_error_hit++;
  70   if( !sqlite3_io_error_benign ) sqlite3_io_error_hardhit++;
  71 }
  72 #define SimulateDiskfullError(CODE) \
  73    if( sqlite3_diskfull_pending ){ \
  74      if( sqlite3_diskfull_pending == 1 ){ \
  75        local_ioerr(); \
  76        sqlite3_diskfull = 1; \
  77        sqlite3_io_error_hit = 1; \
  78        CODE; \
  79      }else{ \
  80        sqlite3_diskfull_pending--; \
  81      } \
  82    }
  83 #else
  84 #define SimulateIOErrorBenign(X)
  85 #define SimulateIOError(A)
  86 #define SimulateDiskfullError(A)
  87 #endif /* defined(SQLITE_TEST) */
  88
  89 /*
  90 ** When testing, keep a count of the number of open files.
  91 */
  92 #if defined(SQLITE_TEST)
  93 extern int sqlite3_open_file_count;
  94 #define OpenCounter(X)  sqlite3_open_file_count+=(X)
  95 #else
  96 #define OpenCounter(X)
  97 #endif /* defined(SQLITE_TEST) */
  98
  99 #endif /* !defined(_OS_COMMON_H_) */