libmdbx: switch to original amalgamated source code (v0.9.1.18)

Amalgamated source code is the recommended form for
embedding libmdbx in non-CMake build systems. This amalgamated
version contains a minimum of files, is fully ready for use,
and make impossible a number of errors.

To upgrade or switch to a different version, just unpack
to the `src` subdirectory a corresponding `libmdbx-amalgamated-X_Y_Z.zip`
at the https://github.com/erthink/libmdbx/releases.

For instance, the https://github.com/erthink/libmdbx/releases/download/v0.9.2/libmdbx-amalgamated-0_9_2.zip
for the next release.

--

Minimal changes have been made to the build configuration:

1. For use the standard `DllMain()` entry of libmdbx:
   - added the `MDBX_BUILD_SHARED_LIBRARY=1` option;
   - removed the `MDBX_CONFIG_MANUAL_TLS_CALLBACK` option;
   - deleted the `miranda.c` file containing only `DllMain()`
     with the `mdbx_dll_handle()` call, now this is done by the library itself.

2. Removed refs to extra files (that missing in the amalgamated source code):
   - for building `libmdbx.dll` only the `mdbx.h` and `mdbx.c` are used,
     but not `mdbx.c++` for a C++ API;
   - for building the `mdbx_chk`, `mdbx_load`, and `mdbx_dump` utilities
     only it own sources are used.

--

Last libmdbx changes:

 - Fixed missing installation of `mdbx.h++`.
 - Fixed use of obsolete `__noreturn`.
 - Fixed use of `yield` instruction on ARM if unsupported.
 - Added pthread workaround for buggy toolchain/cmake/buildroot.
 - Fixed use of `pthread_yield()` for non-GLIBC.
 - Fixed use of `RegGetValueA()` on Windows 2000/XP.
 - Fixed use of `GetTickCount64()` on Windows 2000/XP.
 - Fixed opening DB on a network shares (in the exclusive mode).
 - Fixed copy&paste typos.
 - Fixed minor false-positive GCC warning.

5 files changed, 440 insertions, 0 deletions

diff --git a/libs/libmdbx/src/man1/mdbx_chk.1 b/libs/libmdbx/src/man1/mdbx_chk.1
new file mode 100644
index 0000000000..0348f90b06
--- /dev/null
+++ b/libs/libmdbx/src/man1/mdbx_chk.1
@@ -0,0 +1,98 @@
+.\" Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.TH MDBX_CHK 1 "2020-09-25" "MDBX 0.9.1"
+.SH NAME
+mdbx_chk \- MDBX checking tool
+.SH SYNOPSIS
+.B mdbx_chk
+[\c
+.BR \-V ]
+[\c
+.BR \-v [ v [ v ]]]
+[\c
+.BR \-n ]
+[\c
+.BR \-q ]
+[\c
+.BR \-c ]
+[\c
+.BR \-w ]
+[\c
+.BR \-d ]
+[\c
+.BR \-i ]
+[\c
+.BI \-s \ subdb\fR]
+.BR \ dbpath
+.SH DESCRIPTION
+The
+.B mdbx_chk
+utility intended to check an MDBX database file.
+.SH OPTIONS
+.TP
+.BR \-V
+Write the library version number to the standard output, and exit.
+.TP
+.BR \-v
+Produce verbose output, including summarize space and page usage statistics.
+If \fB\-vv\fP is given, be more verbose, show summarized B-tree info
+and space allocation.
+If \fB\-vvv\fP is given, be more verbose, include summarized statistics
+of leaf B-tree pages.
+If \fB\-vvvv\fP is given, be even more verbose, show info of each page
+during B-tree traversal and basic info of each GC record.
+If \fB\-vvvvv\fP is given, turn maximal verbosity, display the full list
+of page IDs in the GC records and size of each key-value pair of database(s).
+.TP
+.BR \-q
+Be quiet; do not output anything even if an error was detected.
+.TP
+.BR \-c
+Force using cooperative mode while opening environment, i.e. don't try to open
+in exclusive/monopolistic mode. Only exclusive/monopolistic mode allow complete
+check, including full check of all meta-pages and actual size of database file.
+.TP
+.BR \-w
+Open environment in read-write mode and lock for writing while checking.
+This could be impossible if environment already used by another process(s)
+in an incompatible read-write mode. This allow rollback to last steady commit
+(in case environment was not closed properly) and then check transaction IDs
+of meta-pages. Otherwise, without \fB\-w\fP option environment will be
+opened in read-only mode.
+.TP
+.BR \-d
+Disable page-by-page traversal of B-tree. In this case, without B-tree
+traversal, it is unable to check for lost-unused pages nor for double-used
+pages.
+.TP
+.BR \-i
+Ignore wrong order errors, which will likely false-positive if custom
+comparator(s) was used.
+.TP
+.BR \-s \ subdb
+Verify and show info only for a specific subdatabase.
+.TP
+.BR \-0 | \-1 | \-2
+Using specific meta-page 0, or 2 for checking.
+.TP
+.BR \-t
+Turn to a specified meta-page on successful check.
+.TP
+.BR \-T
+Turn to a specified meta-page EVEN ON UNSUCCESSFUL CHECK!
+.TP
+.BR \-n
+Open MDBX environment(s) which do not use subdirectories.
+This is legacy option. For now MDBX handles this automatically.
+
+.SH DIAGNOSTICS
+Exit status is zero if no errors occur. Errors result in a non-zero exit status
+and a diagnostic message being written to standard error
+if no quiet mode was requested.
+.SH "SEE ALSO"
+.BR mdbx_stat (1),
+.BR mdbx_copy (1),
+.BR mdbx_dump (1),
+.BR mdbx_load (1)
+.SH AUTHOR
+Leonid Yuriev <https://github.com/erthink>
diff --git a/libs/libmdbx/src/man1/mdbx_copy.1 b/libs/libmdbx/src/man1/mdbx_copy.1
new file mode 100644
index 0000000000..83fbc904b9
--- /dev/null
+++ b/libs/libmdbx/src/man1/mdbx_copy.1
@@ -0,0 +1,67 @@
+.\" Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
+.\" Copyright 2012-2015 Howard Chu, Symas Corp. All Rights Reserved.
+.\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.TH MDBX_COPY 1 "2020-09-25" "MDBX 0.9.1"
+.SH NAME
+mdbx_copy \- MDBX environment copy tool
+.SH SYNOPSIS
+.B mdbx_copy
+[\c
+.BR \-V ]
+[\c
+.BR \-q ]
+[\c
+.BR \-c ]
+[\c
+.BR \-n ]
+.B src_path
+[\c
+.BR dest_path ]
+.SH DESCRIPTION
+The
+.B mdbx_copy
+utility copies an MDBX environment. The environment can
+be copied regardless of whether it is currently in use.
+No lockfile is created, since it gets recreated at need.
+
+If
+.I dest_path
+is specified it must be the path of an empty directory
+for storing the backup. Otherwise, the backup will be
+written to stdout.
+
+.SH OPTIONS
+.TP
+.BR \-V
+Write the library version number to the standard output, and exit.
+.TP
+.BR \-q
+Be quiet.
+.TP
+.BR \-c
+Compact while copying. Only current data pages will be copied; freed
+or unused pages will be omitted from the copy. This option will
+slow down the backup process as it is more CPU-intensive.
+Currently it fails if the environment has suffered a page leak.
+.TP
+.BR \-n
+Open MDBX environment(s) which do not use subdirectories.
+This is legacy option. For now MDBX handles this automatically.
+
+.SH DIAGNOSTICS
+Exit status is zero if no errors occur.
+Errors result in a non-zero exit status and
+a diagnostic message being written to standard error.
+.SH CAVEATS
+This utility can trigger significant file size growth if run
+in parallel with write transactions, because pages which they
+free during copying cannot be reused until the copy is done.
+.SH "SEE ALSO"
+.BR mdbx_dump (1),
+.BR mdbx_chk (1),
+.BR mdbx_stat (1),
+.BR mdbx_load (1)
+.SH AUTHOR
+Howard Chu of Symas Corporation <http://www.symas.com>,
+Leonid Yuriev <https://github.com/erthink>
diff --git a/libs/libmdbx/src/man1/mdbx_dump.1 b/libs/libmdbx/src/man1/mdbx_dump.1
new file mode 100644
index 0000000000..bdb4d55366
--- /dev/null
+++ b/libs/libmdbx/src/man1/mdbx_dump.1
@@ -0,0 +1,93 @@
+.\" Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
+.\" Copyright 2014-2015 Howard Chu, Symas Corp. All Rights Reserved.
+.\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.TH MDBX_DUMP 1 "2020-09-25" "MDBX 0.9.1"
+.SH NAME
+mdbx_dump \- MDBX environment export tool
+.SH SYNOPSIS
+.B mdbx_dump
+[\c
+.BR \-V ]
+[\c
+.BR \-q ]
+[\c
+.BI \-f \ file\fR]
+[\c
+.BR \-l ]
+[\c
+.BR \-p ]
+[\c
+.BR \-a \ |
+.BI \-s \ subdb\fR]
+[\c
+.BR \-r ]
+[\c
+.BR \-n ]
+.BR \ dbpath
+.SH DESCRIPTION
+The
+.B mdbx_dump
+utility reads a database and writes its contents to the
+standard output using a portable flat-text format
+understood by the
+.BR mdbx_load (1)
+utility.
+.SH OPTIONS
+.TP
+.BR \-V
+Write the library version number to the standard output, and exit.
+.TP
+.BR \-q
+Be quiet.
+.TP
+.BR \-f \ file
+Write to the specified file instead of to the standard output.
+.TP
+.BR \-l
+List the databases stored in the environment. Just the
+names will be listed, no data will be output.
+.TP
+.BR \-p
+If characters in either the key or data items are printing characters (as
+defined by isprint(3)), output them directly. This option permits users to
+use standard text editors and tools to modify the contents of databases.
+
+Note: different systems may have different notions about what characters
+are considered printing characters, and databases dumped in this manner may
+be less portable to external systems.
+.TP
+.BR \-a
+Dump all of the subdatabases in the environment.
+.TP
+.BR \-s \ subdb
+Dump a specific subdatabase. If no database is specified, only the main database is dumped.
+.TP
+.BR \-r
+Rescure mode. Ignore some errors to dump corrupted DB.
+.TP
+.BR \-n
+Dump an MDBX database which does not use subdirectories.
+This is legacy option. For now MDBX handles this automatically.
+
+.SH DIAGNOSTICS
+Exit status is zero if no errors occur.
+Errors result in a non-zero exit status and
+a diagnostic message being written to standard error.
+
+Dumping and reloading databases that use user-defined comparison functions
+will result in new databases that use the default comparison functions.
+\fBIn this case it is quite likely that the reloaded database will be
+damaged beyond repair permitting neither record storage nor retrieval.\fP
+
+The only available workaround is to modify the source for the
+.BR mdbx_load (1)
+utility to load the database using the correct comparison functions.
+.SH "SEE ALSO"
+.BR mdbx_load (1),
+.BR mdbx_copy (1),
+.BR mdbx_chk (1),
+.BR mdbx_stat (1)
+.SH AUTHOR
+Howard Chu of Symas Corporation <http://www.symas.com>,
+Leonid Yuriev <https://github.com/erthink>
diff --git a/libs/libmdbx/src/man1/mdbx_load.1 b/libs/libmdbx/src/man1/mdbx_load.1
new file mode 100644
index 0000000000..950ae0283e
--- /dev/null
+++ b/libs/libmdbx/src/man1/mdbx_load.1
@@ -0,0 +1,104 @@
+.\" Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
+.\" Copyright 2014-2015 Howard Chu, Symas Corp. All Rights Reserved.
+.\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.TH MDBX_LOAD 1 "2020-09-25" "MDBX 0.9.1"
+.SH NAME
+mdbx_load \- MDBX environment import tool
+.SH SYNOPSIS
+.B mdbx_load
+[\c
+.BR \-V ]
+[\c
+.BR \-q ]
+[\c
+.BR \-a ]
+[\c
+.BI \-f \ file\fR]
+[\c
+.BI \-s \ subdb\fR]
+[\c
+.BR \-N ]
+[\c
+.BR \-T ]
+[\c
+.BR \-r ]
+[\c
+.BR \-n ]
+.BR \ dbpath
+.SH DESCRIPTION
+The
+.B mdbx_load
+utility reads from the standard input and loads it into the
+MDBX environment
+.BR dbpath .
+
+The input to
+.B mdbx_load
+must be in the output format specified by the
+.BR mdbx_dump (1)
+utility or as specified by the
+.B -T
+option below.
+
+A simple escape mechanism, where newline and backslash (\\) characters are special, is
+applied to the text input. Newline characters are interpreted as record separators.
+Backslash characters in the text will be interpreted in one of two ways: If the backslash
+character precedes another backslash character, the pair will be interpreted as a literal
+backslash. If the backslash character precedes any other character, the two characters
+following the backslash will be interpreted as a hexadecimal specification of a single
+character; for example, \\0a is a newline character in the ASCII character set.
+
+For this reason, any backslash or newline characters that naturally occur in the text
+input must be escaped to avoid misinterpretation by
+.BR mdbx_load .
+
+.SH OPTIONS
+.TP
+.BR \-V
+Write the library version number to the standard output, and exit.
+.TP
+.BR \-q
+Be quiet.
+.TP
+.BR \-a
+Append all records in the order they appear in the input. The input is assumed to already be
+in correctly sorted order and no sorting or checking for redundant values will be performed.
+This option must be used to reload data that was produced by running
+.B mdbx_dump
+on a database that uses custom compare functions.
+.TP
+.BR \-f \ file
+Read from the specified file instead of from the standard input.
+.TP
+.BR \-s \ subdb
+Load a specific subdatabase. If no database is specified, data is loaded into the main database.
+.TP
+.BR \-N
+Don't overwrite existing records when loading into an already existing database; just skip them.
+.TP
+.BR \-T
+Load data from simple text files. The input must be paired lines of text, where the first
+line of the pair is the key item, and the second line of the pair is its corresponding
+data item.
+.TP
+.BR \-r
+Rescure mode. Ignore errors to load corrupted DB dump.
+.TP
+.BR \-n
+Load an MDBX database which does not use subdirectories.
+This is legacy option. For now MDBX handles this automatically.
+
+.SH DIAGNOSTICS
+Exit status is zero if no errors occur.
+Errors result in a non-zero exit status and
+a diagnostic message being written to standard error.
+
+.SH "SEE ALSO"
+.BR mdbx_dump (1),
+.BR mdbx_chk (1),
+.BR mdbx_stat (1),
+.BR mdbx_copy (1)
+.SH AUTHOR
+Howard Chu of Symas Corporation <http://www.symas.com>,
+Leonid Yuriev <https://github.com/erthink>
diff --git a/libs/libmdbx/src/man1/mdbx_stat.1 b/libs/libmdbx/src/man1/mdbx_stat.1
new file mode 100644
index 0000000000..ec0ffb1280
--- /dev/null
+++ b/libs/libmdbx/src/man1/mdbx_stat.1
@@ -0,0 +1,78 @@
+.\" Copyright 2015-2020 Leonid Yuriev <leo@yuriev.ru>.
+.\" Copyright 2012-2015 Howard Chu, Symas Corp. All Rights Reserved.
+.\" Copyright 2015,2016 Peter-Service R&D LLC <http://billing.ru/>.
+.\" Copying restrictions apply.  See COPYRIGHT/LICENSE.
+.TH MDBX_STAT 1 "2020-09-25" "MDBX 0.9.1"
+.SH NAME
+mdbx_stat \- MDBX environment status tool
+.SH SYNOPSIS
+.B mdbx_stat
+[\c
+.BR \-V ]
+[\c
+.BR \-q ]
+[\c
+.BR \-e ]
+[\c
+.BR \-f [ f [ f ]]]
+[\c
+.BR \-r [ r ]]
+[\c
+.BR \-a \ |
+.BI \-s \ subdb\fR]
+.BR \ dbpath
+[\c
+.BR \-n ]
+.SH DESCRIPTION
+The
+.B mdbx_stat
+utility displays the status of an MDBX environment.
+.SH OPTIONS
+.TP
+.BR \-V
+Write the library version number to the standard output, and exit.
+.TP
+.BR \-q
+Be quiet.
+.TP
+.BR \-e
+Display information about the database environment.
+.TP
+.BR \-f
+Display information about the environment freelist.
+If \fB\-ff\fP is given, summarize each freelist entry.
+If \fB\-fff\fP is given, display the full list of page IDs in the freelist.
+.TP
+.BR \-r
+Display information about the environment reader table.
+Shows the process ID, thread ID, and transaction ID for each active
+reader slot. The process ID and transaction ID are in decimal, the
+thread ID is in hexadecimal. The transaction ID is displayed as "-"
+if the reader does not currently have a read transaction open.
+If \fB\-rr\fP is given, check for stale entries in the reader
+table and clear them. The reader table will be printed again
+after the check is performed.
+.TP
+.BR \-a
+Display the status of all of the subdatabases in the environment.
+.TP
+.BR \-s \ subdb
+Display the status of a specific subdatabase.
+.TP
+.BR \-n
+Display the status of an MDBX database which does not use subdirectories.
+This is legacy option. For now MDBX handles this automatically
+for existing databases, but may be required while creating new.
+
+.SH DIAGNOSTICS
+Exit status is zero if no errors occur.
+Errors result in a non-zero exit status and
+a diagnostic message being written to standard error.
+.SH "SEE ALSO"
+.BR mdbx_chk (1),
+.BR mdbx_copy (1),
+.BR mdbx_dump (1),
+.BR mdbx_load (1)
+.SH AUTHOR
+Howard Chu of Symas Corporation <http://www.symas.com>,
+Leonid Yuriev <https://github.com/erthink>