/* ** 2007 August 28 ** ** The author disclaims copyright to this source code. In place of ** a legal notice, here is a blessing: ** ** May you do good and not evil. ** May you find forgiveness for yourself and forgive others. ** May you share freely, never taking more than you give. ** ************************************************************************* ** ** This file contains the common header for all mutex implementations. ** The sqliteInt.h header #includes this file so that it is available ** to all source files. We break it out in an effort to keep the code ** better organized. ** ** NOTE: source files should *not* #include this header file directly. ** Source files should #include the sqliteInt.h file and let that file ** include this one indirectly. */ /* ** Figure out what version of the code to use. The choices are ** ** SQLITE_MUTEX_OMIT No mutex logic. Not even stubs. The ** mutexes implemention cannot be overridden ** at start-time. ** ** SQLITE_MUTEX_NOOP For single-threaded applications. No ** mutual exclusion is provided. But this ** implementation can be overridden at ** start-time. ** ** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix. ** ** SQLITE_MUTEX_W32 For multi-threaded applications on Win32. ** ** SQLITE_MUTEX_OS2 For multi-threaded applications on OS/2. */ #if !SQLITE_THREADSAFE # define SQLITE_MUTEX_OMIT #endif #if SQLITE_THREADSAFE && !defined(SQLITE_MUTEX_NOOP) # if SQLITE_OS_UNIX # define SQLITE_MUTEX_PTHREADS # elif SQLITE_OS_WIN # define SQLITE_MUTEX_W32 # elif SQLITE_OS_OS2 # define SQLITE_MUTEX_OS2 # else # define SQLITE_MUTEX_NOOP # endif #endif #ifdef SQLITE_MUTEX_OMIT /* ** If this is a no-op implementation, implement everything as macros. */ #define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8) #define sqlite3_mutex_free(X) #define sqlite3_mutex_enter(X) #define sqlite3_mutex_try(X) SQLITE_OK #define sqlite3_mutex_leave(X) #define sqlite3_mutex_held(X) ((void)(X),1) #define sqlite3_mutex_notheld(X) ((void)(X),1) #define sqlite3MutexAlloc(X) ((sqlite3_mutex*)8) #define sqlite3MutexInit() SQLITE_OK #define sqlite3MutexEnd() #endif /* defined(SQLITE_MUTEX_OMIT) */