1437b9013Sdrh /* 2437b9013Sdrh ** 2007 August 28 3437b9013Sdrh ** 4437b9013Sdrh ** The author disclaims copyright to this source code. In place of 5437b9013Sdrh ** a legal notice, here is a blessing: 6437b9013Sdrh ** 7437b9013Sdrh ** May you do good and not evil. 8437b9013Sdrh ** May you find forgiveness for yourself and forgive others. 9437b9013Sdrh ** May you share freely, never taking more than you give. 10437b9013Sdrh ** 11437b9013Sdrh ************************************************************************* 12437b9013Sdrh ** 13437b9013Sdrh ** This file contains the common header for all mutex implementations. 14437b9013Sdrh ** The sqliteInt.h header #includes this file so that it is available 15437b9013Sdrh ** to all source files. We break it out in an effort to keep the code 16437b9013Sdrh ** better organized. 17437b9013Sdrh ** 18437b9013Sdrh ** NOTE: source files should *not* #include this header file directly. 19437b9013Sdrh ** Source files should #include the sqliteInt.h file and let that file 20437b9013Sdrh ** include this one indirectly. 21437b9013Sdrh */ 22437b9013Sdrh 23437b9013Sdrh 24437b9013Sdrh /* 25437b9013Sdrh ** Figure out what version of the code to use. The choices are 26437b9013Sdrh ** 2718472fa7Sdrh ** SQLITE_MUTEX_OMIT No mutex logic. Not even stubs. The 2860ec914cSpeter.d.reid ** mutexes implementation cannot be overridden 2918472fa7Sdrh ** at start-time. 30437b9013Sdrh ** 3118472fa7Sdrh ** SQLITE_MUTEX_NOOP For single-threaded applications. No 3218472fa7Sdrh ** mutual exclusion is provided. But this 3318472fa7Sdrh ** implementation can be overridden at 3418472fa7Sdrh ** start-time. 35437b9013Sdrh ** 36437b9013Sdrh ** SQLITE_MUTEX_PTHREADS For multi-threaded applications on Unix. 37437b9013Sdrh ** 38c7ce76afSdrh ** SQLITE_MUTEX_W32 For multi-threaded applications on Win32. 39437b9013Sdrh */ 4018472fa7Sdrh #if !SQLITE_THREADSAFE 4118472fa7Sdrh # define SQLITE_MUTEX_OMIT 42437b9013Sdrh #endif 4318472fa7Sdrh #if SQLITE_THREADSAFE && !defined(SQLITE_MUTEX_NOOP) 4418472fa7Sdrh # if SQLITE_OS_UNIX 45437b9013Sdrh # define SQLITE_MUTEX_PTHREADS 4618472fa7Sdrh # elif SQLITE_OS_WIN 47c7ce76afSdrh # define SQLITE_MUTEX_W32 4818472fa7Sdrh # else 4918472fa7Sdrh # define SQLITE_MUTEX_NOOP 5018472fa7Sdrh # endif 51437b9013Sdrh #endif 52437b9013Sdrh 5318472fa7Sdrh #ifdef SQLITE_MUTEX_OMIT 54437b9013Sdrh /* 55437b9013Sdrh ** If this is a no-op implementation, implement everything as macros. 56437b9013Sdrh */ 57437b9013Sdrh #define sqlite3_mutex_alloc(X) ((sqlite3_mutex*)8) 58437b9013Sdrh #define sqlite3_mutex_free(X) 59437b9013Sdrh #define sqlite3_mutex_enter(X) 60437b9013Sdrh #define sqlite3_mutex_try(X) SQLITE_OK 61437b9013Sdrh #define sqlite3_mutex_leave(X) 62bd2aaf9aSshaneh #define sqlite3_mutex_held(X) ((void)(X),1) 63bd2aaf9aSshaneh #define sqlite3_mutex_notheld(X) ((void)(X),1) 648c4d6b97Sdrh #define sqlite3MutexAlloc(X) ((sqlite3_mutex*)8) 65d025174fSdanielk1977 #define sqlite3MutexInit() SQLITE_OK 66d025174fSdanielk1977 #define sqlite3MutexEnd() 6730ddce6fSdrh #define MUTEX_LOGIC(X) 6830ddce6fSdrh #else 6930ddce6fSdrh #define MUTEX_LOGIC(X) X 70*e2b7a769Sdrh int sqlite3_mutex_held(sqlite3_mutex*); 711cf021e1Sdan #endif /* defined(SQLITE_MUTEX_OMIT) */ 72