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Comment:Fix typos in the custombuild.html document.
Timelines: family | ancestors | descendants | both | trunk
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SHA1: 63f32cf18cc74044fc03eafe34800b8af3e5a5d8
User & Date: drh 2010-01-15 01:21:01
Context
2010-01-15
05:16
Fix another typo in custombuild.html. check-in: 06a55cbcb5 user: dan tags: trunk
01:21
Fix typos in the custombuild.html document. check-in: 63f32cf18c user: drh tags: trunk
2010-01-14
11:43
Fix an error in the matchinfo example in fts3.html. check-in: ceff4c1d37 user: dan tags: trunk
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Changes to pages/custombuild.in.

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<blockquote><pre>
-DSQLITE_THREADSAFE=0
</pre></blockquote>

<p>Mutexes are cheap but they are not free, so performance will be better
when mutexes are completely disabled.  The resulting library footprint
will also be a little smaller.  Disability the mutexes as compile-time
is a recommended optimization for applications were it makes sense.</p>

<p>When using SQLite as a shared library, an application can test to see
whether or not mutexes have been disabled using the
[sqlite3_threadsafe()] API.  Applications that link against SQLite at
run-time and use SQLite from multiple threads should probably check this
API to make sure they did not accidently get linked against a version of
................................................................................
startup.</i></p>

<h2>4.0 Adding New Virtual File Systems</h2>

<p>Since [version 3.5.0], SQLite has supported an interface called the
[sqlite3_vfs | virtual file system] or "VFS".
This object is somewhat misnamed since it
is really an interface to whole underlying operating system,
just the filesystem.</p>

<p> One of the interesting features
of the VFS interface is that SQLite can support multiple VFSes at the
same time.  Each [database connection] has to choose a single VFS for its
use when the connection is first opened using [sqlite3_open_v2()].
But if a process contains multiple [database connections] each can choose







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<blockquote><pre>
-DSQLITE_THREADSAFE=0
</pre></blockquote>

<p>Mutexes are cheap but they are not free, so performance will be better
when mutexes are completely disabled.  The resulting library footprint
will also be a little smaller.  Disabling the mutexes at compile-time
is a recommended optimization for applications were it makes sense.</p>

<p>When using SQLite as a shared library, an application can test to see
whether or not mutexes have been disabled using the
[sqlite3_threadsafe()] API.  Applications that link against SQLite at
run-time and use SQLite from multiple threads should probably check this
API to make sure they did not accidently get linked against a version of
................................................................................
startup.</i></p>

<h2>4.0 Adding New Virtual File Systems</h2>

<p>Since [version 3.5.0], SQLite has supported an interface called the
[sqlite3_vfs | virtual file system] or "VFS".
This object is somewhat misnamed since it
is really an interface to whole underlying operating system, not
just the filesystem.</p>

<p> One of the interesting features
of the VFS interface is that SQLite can support multiple VFSes at the
same time.  Each [database connection] has to choose a single VFS for its
use when the connection is first opened using [sqlite3_open_v2()].
But if a process contains multiple [database connections] each can choose