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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 1.9 2008/10/07 15:25:48 drh Exp $
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*/
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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_OMIT No mutex logic. Not even stubs. The
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** mutexes implemention cannot be overridden
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** at start-time.
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**
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** SQLITE_MUTEX_NOOP For single-threaded applications. No
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** mutual exclusion is provided. But this
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** implementation can be overridden at
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** start-time.
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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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#if !SQLITE_THREADSAFE
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# define SQLITE_MUTEX_OMIT
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#endif
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#if SQLITE_THREADSAFE && !defined(SQLITE_MUTEX_NOOP)
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# if SQLITE_OS_UNIX
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# define SQLITE_MUTEX_PTHREADS
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# elif SQLITE_OS_WIN
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# define SQLITE_MUTEX_W32
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# elif SQLITE_OS_OS2
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# define SQLITE_MUTEX_OS2
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# else
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# define SQLITE_MUTEX_NOOP
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# endif
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#endif
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#ifdef SQLITE_MUTEX_OMIT
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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 /* defined(SQLITE_OMIT_MUTEX) */
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