/*+
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** 2004 May 22+
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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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**+
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** This file contains macros and a little bit of code that is common to+
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** all of the platform-specific files (os_*.c) and is #included into those+
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** files.+
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**+
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** This file should be #included by the os_*.c files only.  It is not a+
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** general purpose header file.+
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*/+
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+
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/*+
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** At least two bugs have slipped in because we changed the MEMORY_DEBUG+
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** macro to SQLITE_DEBUG and some older makefiles have not yet made the+
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** switch.  The following code should catch this problem at compile-time.+
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*/+
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#ifdef MEMORY_DEBUG+
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# error "The MEMORY_DEBUG macro is obsolete.  Use SQLITE_DEBUG instead."+
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#endif+
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+
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+
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/*+
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 * When testing, this global variable stores the location of the+
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 * pending-byte in the database file.+
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 */+
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#ifdef SQLITE_TEST+
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unsigned int sqlite3_pending_byte = 0x40000000;+
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#endif+
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+
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#ifdef SQLITE_DEBUG+
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int sqlite3_os_trace = 0;+
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#define OSTRACE1(X)         if( sqlite3_os_trace ) sqlite3DebugPrintf(X)+
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#define OSTRACE2(X,Y)       if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y)+
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#define OSTRACE3(X,Y,Z)     if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y,Z)+
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#define OSTRACE4(X,Y,Z,A)   if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y,Z,A)+
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#define OSTRACE5(X,Y,Z,A,B) if( sqlite3_os_trace ) sqlite3DebugPrintf(X,Y,Z,A,B)+
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#define OSTRACE6(X,Y,Z,A,B,C) \+
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    if(sqlite3_os_trace) sqlite3DebugPrintf(X,Y,Z,A,B,C)+
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#define OSTRACE7(X,Y,Z,A,B,C,D) \+
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    if(sqlite3_os_trace) sqlite3DebugPrintf(X,Y,Z,A,B,C,D)+
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#else+
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#define OSTRACE1(X)+
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#define OSTRACE2(X,Y)+
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#define OSTRACE3(X,Y,Z)+
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#define OSTRACE4(X,Y,Z,A)+
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#define OSTRACE5(X,Y,Z,A,B)+
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#define OSTRACE6(X,Y,Z,A,B,C)+
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#define OSTRACE7(X,Y,Z,A,B,C,D)+
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#endif+
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+
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/*+
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** Macros for performance tracing.  Normally turned off.  Only works+
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** on i486 hardware.+
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*/+
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#ifdef SQLITE_PERFORMANCE_TRACE+
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__inline__ unsigned long long int hwtime(void){+
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  unsigned long long int x;+
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  __asm__("rdtsc\n\t"+
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          "mov %%edx, %%ecx\n\t"+
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          :"=A" (x));+
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  return x;+
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}+
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static unsigned long long int g_start;+
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static unsigned int elapse;+
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#define TIMER_START       g_start=hwtime()+
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#define TIMER_END         elapse=hwtime()-g_start+
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#define TIMER_ELAPSED     elapse+
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#else+
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#define TIMER_START+
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#define TIMER_END+
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#define TIMER_ELAPSED     0+
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#endif+
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+
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/*+
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** If we compile with the SQLITE_TEST macro set, then the following block+
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** of code will give us the ability to simulate a disk I/O error.  This+
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** is used for testing the I/O recovery logic.+
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*/+
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#ifdef SQLITE_TEST+
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int sqlite3_io_error_hit = 0;+
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int sqlite3_io_error_pending = 0;+
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int sqlite3_io_error_persist = 0;+
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int sqlite3_diskfull_pending = 0;+
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int sqlite3_diskfull = 0;+
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#define SimulateIOError(CODE)  \+
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  if( sqlite3_io_error_pending || sqlite3_io_error_hit ) \+
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     if( sqlite3_io_error_pending-- == 1 \+
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         || (sqlite3_io_error_persist && sqlite3_io_error_hit) ) \+
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                { local_ioerr(); CODE; }+
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static void local_ioerr(){+
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  IOTRACE(("IOERR\n"));+
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  sqlite3_io_error_hit = 1;+
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}+
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#define SimulateDiskfullError(CODE) \+
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   if( sqlite3_diskfull_pending ){ \+
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     if( sqlite3_diskfull_pending == 1 ){ \+
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       local_ioerr(); \+
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       sqlite3_diskfull = 1; \+
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       sqlite3_io_error_hit = 1; \+
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       CODE; \+
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     }else{ \+
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       sqlite3_diskfull_pending--; \+
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     } \+
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   }+
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#else+
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#define SimulateIOError(A)+
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#define SimulateDiskfullError(A)+
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#endif+
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+
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/*+
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** When testing, keep a count of the number of open files.+
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*/+
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#ifdef SQLITE_TEST+
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int sqlite3_open_file_count = 0;+
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#define OpenCounter(X)  sqlite3_open_file_count+=(X)+
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#else+
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#define OpenCounter(X)+
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#endif+
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