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Overview
| Comment: | Enhance the description of the SQLITE_ENABLE_LOCKING_STYLE option in compile.html. |
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| Downloads: | Tarball | ZIP archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
523d4bcf07c7ed808e1de05134ff48d3 |
| User & Date: | dan 2008-09-04 09:26:47.000 |
Context
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2008-09-04
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| 17:09 | Add documentation for SQLITE_DEFAULT_MEMSTATUS to compile.html. (check-in: 1445db0dec user: dan tags: trunk) | |
| 09:26 | Enhance the description of the SQLITE_ENABLE_LOCKING_STYLE option in compile.html. (check-in: 523d4bcf07 user: dan tags: trunk) | |
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2008-09-02
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| 21:34 | Add the threadsafe.html document and related documentation changes. (check-in: 44c2594627 user: drh tags: trunk) | |
Changes
Changes to pages/compile.in.
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compiled with this option, then the CLI provides an extra command
named ".iotrace" that provides a low-level log of I/O activity.
This option is experimental and may be discontinued in a future release.
}
COMPILE_OPTION {SQLITE_ENABLE_LOCKING_STYLE} {
This option enables additional logic in the OS interface layer for
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compiled with this option, then the CLI provides an extra command
named ".iotrace" that provides a low-level log of I/O activity.
This option is experimental and may be discontinued in a future release.
}
COMPILE_OPTION {SQLITE_ENABLE_LOCKING_STYLE} {
This option enables additional logic in the OS interface layer for
Mac OS X. The additional logic attempts to determine the type of the
underlying filesystem and choose and alternative locking strategy
that works correctly for that filesystem type. Five locking strategies
are available:
<ul>
<li> Posix locking style. This is the default locking style and the
style used by other (non OSX) unixes. Locks are obtained and
released using the fcntl() system call.
<li> AFP locking style. This locking style is used for network file
systems that use the AFP (Apple Filing Protocol) protocol. Locks
are obtained by calling the library function _AFPFSSetLock().
<li> Flock locking style. This is used for file-systems that do not
support posix locking style. Locks are obtained and released using
the flock() system call.
<li> Dot-file locking style. This locking style is used when neither
flock nor posix locking styles are supported by the file system.
Database locks are obtained by creating and entry in the file-system
at a well-known location relative to the database file (a "dot-file")
and relinquished by deleting the same file.
<li> No locking style. If none of the above can be supported, this
locking style is used. No database locking mechanism is used. When
this system is used it is not safe for a single database to be
accessed by multiple clients.
</ul>
Additionally, five extra VFS implementations are provided as well as the
default. By specifying one of the extra VFS implementations
when calling [sqlite3_open_v2()], an application may bypass the file-system
detection logic and explicitly select one of the above locking styles. The
five extra VFS implementations are called "unix-posix", "unix-afp",
"unix-flock", "unix-dotfile" and "unix-none".
}
COMPILE_OPTION {SQLITE_ENABLE_MEMORY_MANAGEMENT} {
This option adds extra logic to SQLite that allows it to release unused
memory upon request. This option must be enabled in order for the
[sqlite3_release_memory()] interface to work. If this compile-time
option is not used, the [sqlite3_release_memory()] interface is a
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