Annotation of embedaddon/sqlite3/src/mutex.h, revision 1.1.1.1
1.1 misho 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:
23:
24: /*
25: ** Figure out what version of the code to use. The choices are
26: **
27: ** SQLITE_MUTEX_OMIT No mutex logic. Not even stubs. The
28: ** mutexes implemention cannot be overridden
29: ** at start-time.
30: **
31: ** SQLITE_MUTEX_NOOP For single-threaded applications. No
32: ** mutual exclusion is provided. But this
33: ** implementation can be overridden at
34: ** start-time.
35: **
36: ** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix.
37: **
38: ** SQLITE_MUTEX_W32 For multi-threaded applications on Win32.
39: **
40: ** SQLITE_MUTEX_OS2 For multi-threaded applications on OS/2.
41: */
42: #if !SQLITE_THREADSAFE
43: # define SQLITE_MUTEX_OMIT
44: #endif
45: #if SQLITE_THREADSAFE && !defined(SQLITE_MUTEX_NOOP)
46: # if SQLITE_OS_UNIX
47: # define SQLITE_MUTEX_PTHREADS
48: # elif SQLITE_OS_WIN
49: # define SQLITE_MUTEX_W32
50: # elif SQLITE_OS_OS2
51: # define SQLITE_MUTEX_OS2
52: # else
53: # define SQLITE_MUTEX_NOOP
54: # endif
55: #endif
56:
57: #ifdef SQLITE_MUTEX_OMIT
58: /*
59: ** If this is a no-op implementation, implement everything as macros.
60: */
61: #define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8)
62: #define sqlite3_mutex_free(X)
63: #define sqlite3_mutex_enter(X)
64: #define sqlite3_mutex_try(X) SQLITE_OK
65: #define sqlite3_mutex_leave(X)
66: #define sqlite3_mutex_held(X) ((void)(X),1)
67: #define sqlite3_mutex_notheld(X) ((void)(X),1)
68: #define sqlite3MutexAlloc(X) ((sqlite3_mutex*)8)
69: #define sqlite3MutexInit() SQLITE_OK
70: #define sqlite3MutexEnd()
71: #define MUTEX_LOGIC(X)
72: #else
73: #define MUTEX_LOGIC(X) X
74: #endif /* defined(SQLITE_MUTEX_OMIT) */
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