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Compatibility Macros(3) | Library Functions Manual | Compatibility Macros(3) |
NAME¶
Compatibility Macros -Macros¶
#define MDB_DEVEL 0
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 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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