persistentstorage/sql/SQLite/mutex.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Fri, 22 Jan 2010 11:06:30 +0200
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/*
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** 2007 August 28
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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 the common header for all mutex implementations.
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** The sqliteInt.h header #includes this file so that it is available
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** to all source files.  We break it out in an effort to keep the code
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** better organized.
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**
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** NOTE:  source files should *not* #include this header file directly.
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** Source files should #include the sqliteInt.h file and let that file
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** include this one indirectly.
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**
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** $Id: mutex.h,v 1.8 2008/06/26 10:41:19 danielk1977 Exp $
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*/
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#ifdef SQLITE_MUTEX_APPDEF
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/*
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** If SQLITE_MUTEX_APPDEF is defined, then this whole module is
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** omitted and equivalent functionality must be provided by the
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** application that links against the SQLite library.
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*/
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#else
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/*
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** Figure out what version of the code to use.  The choices are
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**
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**   SQLITE_MUTEX_NOOP         For single-threaded applications that
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**                             do not desire error checking.
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**
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**   SQLITE_MUTEX_NOOP_DEBUG   For single-threaded applications with
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**                             error checking to help verify that mutexes
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**                             are being used correctly even though they
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**                             are not needed.  Used when SQLITE_DEBUG is
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**                             defined on single-threaded builds.
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**
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**   SQLITE_MUTEX_PTHREADS     For multi-threaded applications on Unix.
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**
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**   SQLITE_MUTEX_W32          For multi-threaded applications on Win32.
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**
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**   SQLITE_MUTEX_OS2          For multi-threaded applications on OS/2.
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*/
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#define SQLITE_MUTEX_NOOP 1   /* The default */
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#if defined(SQLITE_DEBUG) && !SQLITE_THREADSAFE
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# undef SQLITE_MUTEX_NOOP
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# define SQLITE_MUTEX_NOOP_DEBUG
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#endif
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#if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && SQLITE_OS_UNIX
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# undef SQLITE_MUTEX_NOOP
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# define SQLITE_MUTEX_PTHREADS
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#endif
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#if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && SQLITE_OS_WIN
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# undef SQLITE_MUTEX_NOOP
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# define SQLITE_MUTEX_W32
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#endif
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#if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && SQLITE_OS_OS2
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# undef SQLITE_MUTEX_NOOP
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# define SQLITE_MUTEX_OS2
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#endif
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#ifdef SQLITE_MUTEX_NOOP
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/*
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** If this is a no-op implementation, implement everything as macros.
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*/
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#define sqlite3_mutex_alloc(X)    ((sqlite3_mutex*)8)
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#define sqlite3_mutex_free(X)
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#define sqlite3_mutex_enter(X)
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#define sqlite3_mutex_try(X)      SQLITE_OK
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#define sqlite3_mutex_leave(X)
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#define sqlite3_mutex_held(X)     1
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#define sqlite3_mutex_notheld(X)  1
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#define sqlite3MutexAlloc(X)      ((sqlite3_mutex*)8)
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#define sqlite3MutexInit()        SQLITE_OK
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#define sqlite3MutexEnd()
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#endif
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#endif /* SQLITE_MUTEX_APPDEF */