/*+
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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 1282 2008-11-13 09:31:33Z LarsPson $+
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*/+
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+
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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 && 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 && 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 && 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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+
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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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#endif+
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+
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#endif /* SQLITE_MUTEX_APPDEF */+
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