compat(3) Library Functions Manual compat(3)
NAME
compat - Compatibility Macros
SYNOPSIS
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[1]
typedef pthread_mutex_t * mdb_mutexref_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 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 Documentation
typedef pthread_mutex_t mdb_mutex_t[1]
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
Author
Generated automatically by Doxygen for LMDB from the source code.
LMDB Thu Mar 24 2022 compat(3)
Generated by dwww version 1.14 on Fri Jan 24 06:13:46 CET 2025.