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code should catch this problem at compile-time. 27 */ 28 #ifdef MEMORY_DEBUG 29 # error "The MEMORY_DEBUG macro is obsolete.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 /* 39 ** hwtime.h contains inline assembler code for implementing 40 ** high-performance timing routines. 41 */ 42 #include "hwtime.h" 43 44 static sqlite_uint64 g_start; 45 static sqlite_uint64 g_elapsed; 46 #define TIMER_START g_start=sqlite3Hwtime() 47 #define TIMER_END g_elapsed=sqlite3Hwtime()-g_start 48 #define TIMER_ELAPSED g_elapsed 49 #else 50 #define TIMER_START 51 #define TIMER_END 52 #define TIMER_ELAPSED ((sqlite_uint64)0) 53 #endif 54 55 /* 56 ** If we compile with the SQLITE_TEST macro set, then the following block 57 ** of code will give us the ability to simulate a disk I/O error. This 58 ** is used for testing the I/O recovery logic. 59 */ 60 #if defined(SQLITE_TEST) 61 extern int sqlite3_io_error_hit; 62 extern int sqlite3_io_error_hardhit; 63 extern int sqlite3_io_error_pending; 64 extern int sqlite3_io_error_persist; 65 extern int sqlite3_io_error_benign; 66 extern int sqlite3_diskfull_pending; 67 extern int sqlite3_diskfull; 68 #define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X) 69 #define SimulateIOError(CODE) \ 70 if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \ 71 || sqlite3_io_error_pending-- == 1 ) \ 72 { local_ioerr(); CODE; } local_ioerr()73static void local_ioerr(){ 74 IOTRACE(("IOERR\n")); 75 sqlite3_io_error_hit++; 76 if( !sqlite3_io_error_benign ) sqlite3_io_error_hardhit++; 77 } 78 #define SimulateDiskfullError(CODE) \ 79 if( sqlite3_diskfull_pending ){ \ 80 if( sqlite3_diskfull_pending == 1 ){ \ 81 local_ioerr(); \ 82 sqlite3_diskfull = 1; \ 83 sqlite3_io_error_hit = 1; \ 84 CODE; \ 85 }else{ \ 86 sqlite3_diskfull_pending--; \ 87 } \ 88 } 89 #else 90 #define SimulateIOErrorBenign(X) 91 #define SimulateIOError(A) 92 #define SimulateDiskfullError(A) 93 #endif /* defined(SQLITE_TEST) */ 94 95 /* 96 ** When testing, keep a count of the number of open files. 97 */ 98 #if defined(SQLITE_TEST) 99 extern int sqlite3_open_file_count; 100 #define OpenCounter(X) sqlite3_open_file_count+=(X) 101 #else 102 #define OpenCounter(X) 103 #endif /* defined(SQLITE_TEST) */ 104 105 #endif /* !defined(_OS_COMMON_H_) */ 106