NAME

       Windows Compatibility Macros -

   Macros
       #define Z   'z'
       #define MDB_PIDLOCK   1
       #define LOCK_MUTEX_R(env)   pthread_mutex_lock(&(env)->me_txns->mti_mutex)
       #define UNLOCK_MUTEX_R(env)   pthread_mutex_unlock(&(env)->me_txns->mti_mutex)
       #define LOCK_MUTEX_W(env)   pthread_mutex_lock(&(env)->me_txns->mti_wmutex)
       #define UNLOCK_MUTEX_W(env)   pthread_mutex_unlock(&(env)->me_txns->mti_wmutex)
       #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))

Detailed Description

       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 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.

Author

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