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NCBI C++ ToolKit: Compatibility Macros

A bunch of macros to minimize the amount of platform-specific ifdefs needed throughout the rest of the code. More...

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.

◆ ErrCode

Get the error code for the last failed system function.

Definition at line 377 of file mdb.c.

◆ GET_PAGESIZE #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.

Definition at line 395 of file mdb.c.

◆ HANDLE ◆ INVALID_HANDLE_VALUE #define INVALID_HANDLE_VALUE (-1)

A value for an invalid file handle.

Mainly used to initialize file variables and signify that they are unused.

Definition at line 389 of file mdb.c.

◆ LOCK_MUTEX0 #define LOCK_MUTEX0 ( mutex ) pthread_mutex_lock(mutex) ◆ MDB_DEVEL

Features under development.

Definition at line 230 of file mdb.c.

◆ mdb_func_ #define mdb_func_ "<mdb_unknown>"

Wrapper around __func__, which is a C99 feature.

Definition at line 240 of file mdb.c.

◆ mdb_mutex_consistent #define mdb_mutex_consistent ( mutex ) pthread_mutex_consistent(mutex)

Mark mutex-protected data as repaired, after death of previous owner.

Definition at line 372 of file mdb.c.

◆ MDB_NO_ROOT ◆ MDB_PIDLOCK

For MDB_LOCK_FORMAT: True if readers take a pid lock in the lockfile.

Definition at line 337 of file mdb.c.

◆ MDB_USE_ROBUST

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.)

Definition at line 273 of file mdb.c.

◆ MNAME_LEN #define MNAME_LEN (sizeof(pthread_mutex_t))

Definition at line 401 of file mdb.c.

◆ THREAD_CREATE #define THREAD_CREATE ( thr, start, arg ) pthread_create(&thr,NULL,start,arg)

Definition at line 332 of file mdb.c.

◆ THREAD_FINISH #define THREAD_FINISH ( thr ) pthread_join(thr,NULL)

Definition at line 333 of file mdb.c.

◆ THREAD_RET #define THREAD_RET void *

Definition at line 331 of file mdb.c.

◆ UNLOCK_MUTEX #define UNLOCK_MUTEX ( mutex ) pthread_mutex_unlock(mutex)

Unlock the reader or writer mutex.

Definition at line 369 of file mdb.c.

◆ Z

printf format modifier for size_t

Definition at line 334 of file mdb.c.

◆ mdb_mutex_t 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.

Definition at line 360 of file mdb.c.

◆ mdb_mutexref_t

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