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Annotation of embedaddon/sqlite3/src/mutex.h, revision 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) */