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1/*
2** 2007 August 28
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 the common header for all mutex implementations.
14** The sqliteInt.h header #includes this file so that it is available
15** to all source files. We break it out in an effort to keep the code
16** better organized.
17**
18** NOTE: source files should *not* #include this header file directly.
19** Source files should #include the sqliteInt.h file and let that file
20** include this one indirectly.
21**
22** $Id: mutex.h,v 1.2 2007/08/30 14:10:30 drh Exp $
23*/
24
25
26#ifdef SQLITE_MUTEX_APPDEF
27/*
28** If SQLITE_MUTEX_APPDEF is defined, then this whole module is
29** omitted and equivalent functionality must be provided by the
30** application that links against the SQLite library.
31*/
32#else
33/*
34** Figure out what version of the code to use. The choices are
35**
36** SQLITE_MUTEX_NOOP For single-threaded applications that
37** do not desire error checking.
38**
39** SQLITE_MUTEX_NOOP_DEBUG For single-threaded applications with
40** error checking to help verify that mutexes
41** are being used correctly even though they
42** are not needed. Used when SQLITE_DEBUG is
43** defined on single-threaded builds.
44**
45** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix.
46**
47** SQLITE_MUTEX_W32 For multi-threaded applications on Win32.
48**
49** SQLITE_MUTEX_OS2 For multi-threaded applications on OS/2.
50*/
51#define SQLITE_MUTEX_NOOP 1 /* The default */
52#if defined(SQLITE_DEBUG) && !SQLITE_THREADSAFE
53# undef SQLITE_MUTEX_NOOP
54# define SQLITE_MUTEX_NOOP_DEBUG
55#endif
56#if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_UNIX
57# undef SQLITE_MUTEX_NOOP
58# define SQLITE_MUTEX_PTHREADS
59#endif
60#if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_WIN
61# undef SQLITE_MUTEX_NOOP
62# define SQLITE_MUTEX_W32
63#endif
64#if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_OS2
65# undef SQLITE_MUTEX_NOOP
66# define SQLITE_MUTEX_OS2
67#endif
68
69#ifdef SQLITE_MUTEX_NOOP
70/*
71** If this is a no-op implementation, implement everything as macros.
72*/
73#define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8)
74#define sqlite3_mutex_free(X)
75#define sqlite3_mutex_enter(X)
76#define sqlite3_mutex_try(X) SQLITE_OK
77#define sqlite3_mutex_leave(X)
78#define sqlite3_mutex_held(X) 1
79#define sqlite3_mutex_notheld(X) 1
80#endif
81
82#endif /* SQLITE_MUTEX_APPDEF */