|
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 1.8 2008/06/26 10:41:19 danielk1977 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 && SQLITE_OS_UNIX |
|
57 # undef SQLITE_MUTEX_NOOP |
|
58 # define SQLITE_MUTEX_PTHREADS |
|
59 #endif |
|
60 #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && SQLITE_OS_WIN |
|
61 # undef SQLITE_MUTEX_NOOP |
|
62 # define SQLITE_MUTEX_W32 |
|
63 #endif |
|
64 #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && SQLITE_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 #define sqlite3MutexAlloc(X) ((sqlite3_mutex*)8) |
|
81 #define sqlite3MutexInit() SQLITE_OK |
|
82 #define sqlite3MutexEnd() |
|
83 #endif |
|
84 |
|
85 #endif /* SQLITE_MUTEX_APPDEF */ |