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1 /* |
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2 ** 2007 August 28 |
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3 ** |
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4 ** The author disclaims copyright to this source code. In place of |
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5 ** a legal notice, here is a blessing: |
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6 ** |
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7 ** May you do good and not evil. |
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8 ** May you find forgiveness for yourself and forgive others. |
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9 ** May you share freely, never taking more than you give. |
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10 ** |
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11 ************************************************************************* |
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12 ** |
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13 ** This file contains the common header for all mutex implementations. |
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14 ** The sqliteInt.h header #includes this file so that it is available |
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15 ** to all source files. We break it out in an effort to keep the code |
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16 ** better organized. |
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17 ** |
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18 ** NOTE: source files should *not* #include this header file directly. |
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19 ** Source files should #include the sqliteInt.h file and let that file |
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20 ** include this one indirectly. |
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21 ** |
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22 ** $Id: mutex.h 1282 2008-11-13 09:31:33Z LarsPson $ |
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23 */ |
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24 |
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25 |
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26 #ifdef SQLITE_MUTEX_APPDEF |
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27 /* |
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28 ** If SQLITE_MUTEX_APPDEF is defined, then this whole module is |
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29 ** omitted and equivalent functionality must be provided by the |
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30 ** application that links against the SQLite library. |
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31 */ |
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32 #else |
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33 /* |
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34 ** Figure out what version of the code to use. The choices are |
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35 ** |
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36 ** SQLITE_MUTEX_NOOP For single-threaded applications that |
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37 ** do not desire error checking. |
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38 ** |
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39 ** SQLITE_MUTEX_NOOP_DEBUG For single-threaded applications with |
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40 ** error checking to help verify that mutexes |
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41 ** are being used correctly even though they |
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42 ** are not needed. Used when SQLITE_DEBUG is |
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43 ** defined on single-threaded builds. |
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44 ** |
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45 ** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix. |
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46 ** |
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47 ** SQLITE_MUTEX_W32 For multi-threaded applications on Win32. |
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48 ** |
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49 ** SQLITE_MUTEX_OS2 For multi-threaded applications on OS/2. |
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50 */ |
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51 #define SQLITE_MUTEX_NOOP 1 /* The default */ |
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52 #if defined(SQLITE_DEBUG) && !SQLITE_THREADSAFE |
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53 # undef SQLITE_MUTEX_NOOP |
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54 # define SQLITE_MUTEX_NOOP_DEBUG |
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55 #endif |
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56 #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_UNIX |
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57 # undef SQLITE_MUTEX_NOOP |
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58 # define SQLITE_MUTEX_PTHREADS |
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59 #endif |
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60 #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_WIN |
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61 # undef SQLITE_MUTEX_NOOP |
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62 # define SQLITE_MUTEX_W32 |
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63 #endif |
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64 #if defined(SQLITE_MUTEX_NOOP) && SQLITE_THREADSAFE && OS_OS2 |
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65 # undef SQLITE_MUTEX_NOOP |
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66 # define SQLITE_MUTEX_OS2 |
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67 #endif |
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68 |
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69 #ifdef SQLITE_MUTEX_NOOP |
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70 /* |
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71 ** If this is a no-op implementation, implement everything as macros. |
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72 */ |
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73 #define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8) |
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74 #define sqlite3_mutex_free(X) |
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75 #define sqlite3_mutex_enter(X) |
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76 #define sqlite3_mutex_try(X) SQLITE_OK |
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77 #define sqlite3_mutex_leave(X) |
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78 #define sqlite3_mutex_held(X) 1 |
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79 #define sqlite3_mutex_notheld(X) 1 |
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80 #endif |
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81 |
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82 #endif /* SQLITE_MUTEX_APPDEF */ |