mdb_compat (3)

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.

#define MDB_DEVEL 0

Features under development

#define mdb_func_ '<mdb_unknown>'

Wrapper around func, which is a C99 feature

#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_MUTEX_R(env) pthread_mutex_lock(&(env)->me_txns->mti_mutex)

Lock the reader mutex.

#define UNLOCK_MUTEX_R(env) pthread_mutex_unlock(&(env)->me_txns->mti_mutex)

Unlock the reader mutex.

#define LOCK_MUTEX_W(env) pthread_mutex_lock(&(env)->me_txns->mti_wmutex)

Lock the writer mutex. Only a single write transaction is allowed at a time. Other writers will block waiting for this mutex.

#define UNLOCK_MUTEX_W(env) pthread_mutex_unlock(&(env)->me_txns->mti_wmutex)

Unlock the writer mutex.

#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.

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