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** 2004 May 22

** The author disclaims copyright to this source code. In place of

** a legal notice, here is a blessing:

** 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.

******************************************************************************

** This file contains macros and a little bit of code that is common to

** all of the platform-specific files (os_*.c) and is #included into those

** files.

** This file should be #included by the os_*.c files only. It is not a

** general purpose header file.

#ifndef _OS_COMMON_H_

#define _OS_COMMON_H_

** At least two bugs have slipped in because we changed the MEMORY_DEBUG

** macro to SQLITE_DEBUG and some older makefiles have not yet made the

** switch. The following code should catch this problem at compile-time.

#ifdef MEMORY_DEBUG

# error "The MEMORY_DEBUG macro is obsolete. Use SQLITE_DEBUG instead."

#endif

** Macros for performance tracing. Normally turned off. Only works

** on i486 hardware.

#ifdef SQLITE_PERFORMANCE_TRACE

** hwtime.h contains inline assembler code for implementing

** high-performance timing routines.

#include "hwtime.h"

static sqlite_uint64 g_start;

static sqlite_uint64 g_elapsed;

#define TIMER_START g_start=sqlite3Hwtime()

#define TIMER_END g_elapsed=sqlite3Hwtime()-g_start

#define TIMER_ELAPSED g_elapsed

#else

#define TIMER_START

#define TIMER_END

#define TIMER_ELAPSED ((sqlite_uint64)0)

#endif

** If we compile with the SQLITE_TEST macro set, then the following block

** of code will give us the ability to simulate a disk I/O error. This

** is used for testing the I/O recovery logic.

#if defined(SQLITE_TEST)

extern int sqlite3_io_error_hit;

extern int sqlite3_io_error_hardhit;

extern int sqlite3_io_error_pending;

extern int sqlite3_io_error_persist;

extern int sqlite3_io_error_benign;

extern int sqlite3_diskfull_pending;

extern int sqlite3_diskfull;

#define SimulateIOErrorBenign(X) sqlite3_io_error_benign=(X)

#define SimulateIOError(CODE) \

if( (sqlite3_io_error_persist && sqlite3_io_error_hit) \

|| sqlite3_io_error_pending-- == 1 ) \

{ local_ioerr(); CODE; }

static void local_ioerr(){

IOTRACE(("IOERR\n"));

sqlite3_io_error_hit++;

if( !sqlite3_io_error_benign ) sqlite3_io_error_hardhit++;

}

#define SimulateDiskfullError(CODE) \

if( sqlite3_diskfull_pending ){ \

if( sqlite3_diskfull_pending == 1 ){ \

local_ioerr(); \

sqlite3_diskfull = 1; \

sqlite3_io_error_hit = 1; \

CODE; \

}else{ \

sqlite3_diskfull_pending--; \

} \

}

#else

#define SimulateIOErrorBenign(X)

#define SimulateIOError(A)

#define SimulateDiskfullError(A)

#endif /* defined(SQLITE_TEST) */

** When testing, keep a count of the number of open files.

#if defined(SQLITE_TEST)

extern int sqlite3_open_file_count;

#define OpenCounter(X) sqlite3_open_file_count+=(X)

#else

#define OpenCounter(X)

#endif /* defined(SQLITE_TEST) */

#endif /* !defined(_OS_COMMON_H_) */