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Macros #define MDB_DEVEL 0 #define mdb_func_ '<mdb_unknown>' #define MDB_NO_ROOT (MDB_LAST_ERRCODE + 10) #define MDB_USE_ROBUST 1 #define THREAD_RET void * #define THREAD_CREATE(thr, start, arg) pthread_create(&thr,NULL,start,arg) #define THREAD_FINISH(thr) pthread_join(thr,NULL) #define Z 'z' #define MDB_PIDLOCK 1 #define LOCK_MUTEX0(mutex) pthread_mutex_lock(mutex) #define UNLOCK_MUTEX(mutex) pthread_mutex_unlock(mutex) #define mdb_mutex_consistent(mutex) pthread_mutex_consistent(mutex) #define ErrCode() errno #define HANDLE int #define INVALID_HANDLE_VALUE (-1) #define GET_PAGESIZE(x) ((x) = sysconf(_SC_PAGE_SIZE)) #define MNAME_LEN (sizeof(pthread_mutex_t)) Typedefs typedef pthread_mutex_t mdb_mutex_t typedef pthread_mutex_t * mdb_mutexref_t
A bunch of macros to minimize the amount of platform-specific ifdefs needed throughout the rest of the code. When the features this library needs are similar enough to POSIX to be hidden in a one-or-two line replacement, this macro approach is used.
Macro Definition Documentation
#define MDB_DEVEL 0 Features under development #define mdb_func_ '<mdb_unknown>' Wrapper around func, which is a C99 feature #define MDB_USE_ROBUST 1 Some platforms define the EOWNERDEAD error code even though they don't support Robust Mutexes. Compile with -DMDB_USE_ROBUST=0, or use some other mechanism like -DMDB_USE_POSIX_SEM instead of -DMDB_USE_POSIX_MUTEX. (Posix semaphores are not robust.) #define Z 'z' printf format modifier for size_t #define MDB_PIDLOCK 1 For MDB_LOCK_FORMAT: True if readers take a pid lock in the lockfile #define LOCK_MUTEX0(mutex) pthread_mutex_lock(mutex) Lock the reader or writer mutex. Returns 0 or a code to give mdb_mutex_failed(), as in LOCK_MUTEX(). #define UNLOCK_MUTEX(mutex) pthread_mutex_unlock(mutex) Unlock the reader or writer mutex. #define mdb_mutex_consistent(mutex) pthread_mutex_consistent(mutex) Mark mutex-protected data as repaired, after death of previous owner. #define ErrCode() errno Get the error code for the last failed system function. #define HANDLE int An abstraction for a file handle. On POSIX systems file handles are small integers. On Windows they're opaque pointers. #define INVALID_HANDLE_VALUE (-1) A value for an invalid file handle. Mainly used to initialize file variables and signify that they are unused. #define GET_PAGESIZE(x) ((x) = sysconf(_SC_PAGE_SIZE)) Get the size of a memory page for the system. This is the basic size that the platform's memory manager uses, and is fundamental to the use of memory-mapped files.
typedef pthread_mutex_t mdb_mutex_t Shared mutex/semaphore as the original is stored. Not for copies. Instead it can be assigned to an mdb_mutexref_t. When mdb_mutexref_t is a pointer and mdb_mutex_t is not, then it is array[size 1] so it can be assigned to the pointer. typedef pthread_mutex_t* mdb_mutexref_t Reference to an mdb_mutex_t
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