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Overview
Comment: | Get the previous mutex fix working with SQLITE_DEBUG and with the amalgamation. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
df19928f7ee94bca3989313ff16507c1 |
User & Date: | drh 2010-05-05 00:22:21.000 |
Context
2010-05-05
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03:39 | Do not attempt to modify the page_size when running VACUUM on a WAL database. (check-in: 58a1a59be8 user: drh tags: trunk) | |
00:22 | Get the previous mutex fix working with SQLITE_DEBUG and with the amalgamation. (check-in: df19928f7e user: drh tags: trunk) | |
00:05 | When the in single-threaded mode, the sqlite3_mutex_alloc() interface still returns a non-NULL value. The mutex doesn't do anything, but it tests non-NULL. This way, extensions (or VFSes) that use sqlite3_mutex_alloc() can tell the difference between an OOM error and mutexes being disabled. (check-in: 451fd17575 user: drh tags: trunk) | |
Changes
Changes to src/mutex_noop.c.
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68 69 70 71 72 73 74 | ** and debugging purposes. The mutexes still do not provide any ** mutual exclusion. */ /* ** The mutex object */ | | | | > | > | | | | > | > | | > | | > | | | 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | ** and debugging purposes. The mutexes still do not provide any ** mutual exclusion. */ /* ** The mutex object */ typedef struct sqlite3_debug_mutex { int id; /* The mutex type */ int cnt; /* Number of entries without a matching leave */ } sqlite3_debug_mutex; /* ** The sqlite3_mutex_held() and sqlite3_mutex_notheld() routine are ** intended for use inside assert() statements. */ static int debugMutexHeld(sqlite3_mutex *pX){ sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX; return p==0 || p->cnt>0; } static int debugMutexNotheld(sqlite3_mutex *pX){ sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX; return p==0 || p->cnt==0; } /* ** Initialize and deinitialize the mutex subsystem. */ static int debugMutexInit(void){ return SQLITE_OK; } static int debugMutexEnd(void){ return SQLITE_OK; } /* ** The sqlite3_mutex_alloc() routine allocates a new ** mutex and returns a pointer to it. If it returns NULL ** that means that a mutex could not be allocated. */ static sqlite3_mutex *debugMutexAlloc(int id){ static sqlite3_debug_mutex aStatic[6]; sqlite3_debug_mutex *pNew = 0; switch( id ){ case SQLITE_MUTEX_FAST: case SQLITE_MUTEX_RECURSIVE: { pNew = sqlite3Malloc(sizeof(*pNew)); if( pNew ){ pNew->id = id; pNew->cnt = 0; } break; } default: { assert( id-2 >= 0 ); assert( id-2 < (int)(sizeof(aStatic)/sizeof(aStatic[0])) ); pNew = &aStatic[id-2]; pNew->id = id; break; } } return (sqlite3_mutex*)pNew; } /* ** This routine deallocates a previously allocated mutex. */ static void debugMutexFree(sqlite3_mutex *pX){ sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX; assert( p->cnt==0 ); assert( p->id==SQLITE_MUTEX_FAST || p->id==SQLITE_MUTEX_RECURSIVE ); sqlite3_free(p); } /* ** The sqlite3_mutex_enter() and sqlite3_mutex_try() routines attempt ** to enter a mutex. If another thread is already within the mutex, ** sqlite3_mutex_enter() will block and sqlite3_mutex_try() will return ** SQLITE_BUSY. The sqlite3_mutex_try() interface returns SQLITE_OK ** upon successful entry. Mutexes created using SQLITE_MUTEX_RECURSIVE can ** be entered multiple times by the same thread. In such cases the, ** mutex must be exited an equal number of times before another thread ** can enter. If the same thread tries to enter any other kind of mutex ** more than once, the behavior is undefined. */ static void debugMutexEnter(sqlite3_mutex *pX){ sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX; assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) ); p->cnt++; } static int debugMutexTry(sqlite3_mutex *pX){ sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX; assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) ); p->cnt++; return SQLITE_OK; } /* ** The sqlite3_mutex_leave() routine exits a mutex that was ** previously entered by the same thread. The behavior ** is undefined if the mutex is not currently entered or ** is not currently allocated. SQLite will never do either. */ static void debugMutexLeave(sqlite3_mutex *pX){ sqlite3_debug_mutex *p = (sqlite3_debug_mutex*)pX; assert( debugMutexHeld(pX) ); p->cnt--; assert( p->id==SQLITE_MUTEX_RECURSIVE || debugMutexNotheld(pX) ); } sqlite3_mutex_methods *sqlite3NoopMutex(void){ static sqlite3_mutex_methods sMutex = { debugMutexInit, debugMutexEnd, debugMutexAlloc, |
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