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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) */