mirror of
https://github.com/isar/libmdbx.git
synced 2025-01-02 02:14:13 +08:00
204 lines
7.4 KiB
C
204 lines
7.4 KiB
C
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/*******************************************************************************
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*******************************************************************************
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*******************************************************************************
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*
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*
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* #### ##### ##### # #### # # ####
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* # # # # # # # # ## # #
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* # # # # # # # # # # # ####
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* # # ##### # # # # # # # #
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* # # # # # # # # ## # #
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* #### # # # #### # # ####
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*
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*
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*/
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/* using fcntl(F_FULLFSYNC) with 5-10 times slowdown */
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#define MDBX_OSX_WANNA_DURABILITY 0
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/* using fsync() with chance of data lost on power failure */
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#define MDBX_OSX_WANNA_SPEED 1
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#ifndef MDBX_OSX_SPEED_INSTEADOF_DURABILITY
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#define MDBX_OSX_SPEED_INSTEADOF_DURABILITY MDBX_OSX_WANNA_DURABILITY
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#endif /* MDBX_OSX_SPEED_INSTEADOF_DURABILITY */
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/* Controls checking PID against reuse DB environment after the fork() */
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#ifndef MDBX_TXN_CHECKPID
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#if defined(MADV_DONTFORK) || defined(_WIN32) || defined(_WIN64)
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/* PID check could be ommited:
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* - on Linux when madvise(MADV_DONTFORK) is available. i.e. after the fork()
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* mapped pages will not be available for child process.
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* - in Windows where fork() not available. */
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#define MDBX_TXN_CHECKPID 0
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#else
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#define MDBX_TXN_CHECKPID 1
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#endif
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#define MDBX_TXN_CHECKPID_CONFIG "AUTO=" STRINGIFY(MDBX_TXN_CHECKPID)
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#else
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#define MDBX_TXN_CHECKPID_CONFIG STRINGIFY(MDBX_TXN_CHECKPID)
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#endif /* MDBX_TXN_CHECKPID */
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/* Controls checking transaction owner thread against misuse transactions from
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* other threads. */
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#ifndef MDBX_TXN_CHECKOWNER
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#define MDBX_TXN_CHECKOWNER 1
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#define MDBX_TXN_CHECKOWNER_CONFIG "AUTO=" STRINGIFY(MDBX_TXN_CHECKOWNER)
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#else
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#define MDBX_TXN_CHECKOWNER_CONFIG STRINGIFY(MDBX_TXN_CHECKOWNER)
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#endif /* MDBX_TXN_CHECKOWNER */
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/* Does a system have battery-backed Real-Time Clock or just a fake. */
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#ifndef MDBX_TRUST_RTC
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#if defined(__linux__) || defined(__gnu_linux__) || defined(__NetBSD__) || \
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defined(__OpenBSD__)
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#define MDBX_TRUST_RTC 0 /* a lot of embedded systems have a fake RTC */
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#else
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#define MDBX_TRUST_RTC 1
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#endif
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#define MDBX_TRUST_RTC_CONFIG "AUTO=" STRINGIFY(MDBX_TRUST_RTC)
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#else
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#define MDBX_TRUST_RTC_CONFIG STRINGIFY(MDBX_TRUST_RTC)
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#endif /* MDBX_TRUST_RTC */
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//------------------------------------------------------------------------------
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#define MDBX_LOCKING_WIN32FILES -1 /* Win32 File Locking API */
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#define MDBX_LOCKING_SYSV 5 /* SystemV IPC semaphores */
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#define MDBX_LOCKING_POSIX1988 1988 /* POSIX-1 Shared anonymous semaphores */
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#define MDBX_LOCKING_POSIX2001 2001 /* POSIX-2001 Shared Mutexes */
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#define MDBX_LOCKING_POSIX2008 2008 /* POSIX-2008 Robust Mutexes */
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#define MDBX_LOCKING_BENAPHORE 1995 /* BeOS Benaphores, aka Futexes */
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#if defined(_WIN32) || defined(_WIN64)
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#define MDBX_LOCKING MDBX_LOCKING_WIN32FILES
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#else
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#ifndef MDBX_LOCKING
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#if defined(_POSIX_THREAD_PROCESS_SHARED) && \
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_POSIX_THREAD_PROCESS_SHARED >= 200112L && !defined(__FreeBSD__)
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/* Some platforms define the EOWNERDEAD error code even though they
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* don't support Robust Mutexes. If doubt compile with -MDBX_LOCKING=2001. */
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#if defined(EOWNERDEAD) && _POSIX_THREAD_PROCESS_SHARED >= 200809L && \
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(defined(_POSIX_THREAD_ROBUST_PRIO_INHERIT) || \
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defined(_POSIX_THREAD_ROBUST_PRIO_PROTECT) || \
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defined(PTHREAD_MUTEX_ROBUST) || defined(PTHREAD_MUTEX_ROBUST_NP)) && \
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(!defined(__GLIBC__) || \
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__GLIBC_PREREQ(2, 10) /* troubles with Robust mutexes before 2.10 */)
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#define MDBX_LOCKING MDBX_LOCKING_POSIX2008
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#else
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#define MDBX_LOCKING MDBX_LOCKING_POSIX2001
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#endif
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#elif defined(__sun) || defined(__SVR4) || defined(__svr4__)
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#define MDBX_LOCKING MDBX_LOCKING_POSIX1988
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#else
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#define MDBX_LOCKING MDBX_LOCKING_SYSV
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#endif
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#define MDBX_LOCKING_CONFIG "AUTO=" STRINGIFY(MDBX_LOCKING)
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#else
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#define MDBX_LOCKING_CONFIG STRINGIFY(MDBX_LOCKING)
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#endif /* MDBX_LOCKING */
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#endif /* !Windows */
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#ifndef MDBX_USE_OFDLOCKS
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#if defined(F_OFD_SETLK) && defined(F_OFD_SETLKW) && defined(F_OFD_GETLK) && \
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!defined(MDBX_SAFE4QEMU) && \
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!defined(__sun) /* OFD-lock are broken on Solaris */
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#define MDBX_USE_OFDLOCKS 1
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#else
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#define MDBX_USE_OFDLOCKS 0
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#endif
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#define MDBX_USE_OFDLOCKS_CONFIG "AUTO=" STRINGIFY(MDBX_USE_OFDLOCKS)
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#else
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#define MDBX_USE_OFDLOCKS_CONFIG STRINGIFY(MDBX_USE_OFDLOCKS)
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#endif /* MDBX_USE_OFDLOCKS */
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//------------------------------------------------------------------------------
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#ifndef MDBX_CPU_WRITEBACK_IS_COHERENT
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#if defined(__ia32__) || defined(__e2k__) || defined(__hppa) || \
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defined(__hppa__)
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#define MDBX_CPU_WRITEBACK_IS_COHERENT 1
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#else
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#define MDBX_CPU_WRITEBACK_IS_COHERENT 0
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#endif
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#endif /* MDBX_CPU_WRITEBACK_IS_COHERENT */
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#ifndef MDBX_CPU_CACHE_MMAP_NONCOHERENT
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#if defined(__mips) || defined(__mips__) || defined(__mips64) || \
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defined(__mips64__) || defined(_M_MRX000) || defined(_MIPS_) || \
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defined(__MWERKS__) || defined(__sgi)
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/* MIPS has cache coherency issues. */
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#define MDBX_CPU_CACHE_MMAP_NONCOHERENT 1
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#else
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/* LY: assume no relevant mmap/dcache issues. */
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#define MDBX_CPU_CACHE_MMAP_NONCOHERENT 0
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#endif
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#endif /* MDBX_CPU_CACHE_MMAP_NONCOHERENT */
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#ifndef MDBX_64BIT_ATOMIC
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#if MDBX_WORDBITS >= 64
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#define MDBX_64BIT_ATOMIC 1
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#else
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#define MDBX_64BIT_ATOMIC 0
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#endif
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#define MDBX_64BIT_ATOMIC_CONFIG "AUTO=" STRINGIFY(MDBX_64BIT_ATOMIC)
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#else
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#define MDBX_64BIT_ATOMIC_CONFIG STRINGIFY(MDBX_64BIT_ATOMIC)
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#endif /* MDBX_64BIT_ATOMIC */
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#ifndef MDBX_64BIT_CAS
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#if defined(ATOMIC_LLONG_LOCK_FREE)
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#if ATOMIC_LLONG_LOCK_FREE > 1
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#define MDBX_64BIT_CAS 1
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#else
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#define MDBX_64BIT_CAS 0
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#endif
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#elif defined(__GCC_ATOMIC_LLONG_LOCK_FREE)
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#if __GCC_ATOMIC_LLONG_LOCK_FREE > 1
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#define MDBX_64BIT_CAS 1
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#else
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#define MDBX_64BIT_CAS 0
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#endif
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#elif defined(__CLANG_ATOMIC_LLONG_LOCK_FREE)
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#if __CLANG_ATOMIC_LLONG_LOCK_FREE > 1
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#define MDBX_64BIT_CAS 1
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#else
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#define MDBX_64BIT_CAS 0
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#endif
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#elif defined(_MSC_VER) || defined(__APPLE__)
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#define MDBX_64BIT_CAS 1
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#else
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#define MDBX_64BIT_CAS MDBX_64BIT_ATOMIC
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#endif
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#define MDBX_64BIT_CAS_CONFIG "AUTO=" STRINGIFY(MDBX_64BIT_CAS)
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#else
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#define MDBX_64BIT_CAS_CONFIG STRINGIFY(MDBX_64BIT_CAS)
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#endif /* MDBX_64BIT_CAS */
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#if !defined(MDBX_UNALIGNED_OK)
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#if defined(_MSC_VER)
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#define MDBX_UNALIGNED_OK 1 /* avoid MSVC misoptimization */
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#elif __CLANG_PREREQ(5, 0) || __GNUC_PREREQ(5, 0)
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#define MDBX_UNALIGNED_OK 0 /* expecting optimization is well done */
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#elif (defined(__ia32__) || defined(__ARM_FEATURE_UNALIGNED)) && \
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!defined(__ALIGNED__)
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#define MDBX_UNALIGNED_OK 1
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#else
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#define MDBX_UNALIGNED_OK 0
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#endif
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#endif /* MDBX_UNALIGNED_OK */
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#ifndef MDBX_CACHELINE_SIZE
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#if defined(SYSTEM_CACHE_ALIGNMENT_SIZE)
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#define MDBX_CACHELINE_SIZE SYSTEM_CACHE_ALIGNMENT_SIZE
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#elif defined(__ia64__) || defined(__ia64) || defined(_M_IA64)
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#define MDBX_CACHELINE_SIZE 128
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#else
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#define MDBX_CACHELINE_SIZE 64
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#endif
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#endif /* MDBX_CACHELINE_SIZE */
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/*******************************************************************************
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*******************************************************************************
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******************************************************************************/
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