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sqlite3

    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) */