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+.Dd January 24, 2024
+.Dt SQLITE3_THREADSAFE 3
+.Os
+.Sh NAME
+.Nm sqlite3_threadsafe
+.Nd test to see if the library is threadsafe
+.Sh SYNOPSIS
+.In sqlite3.h
+.Ft int
+.Fo sqlite3_threadsafe
+.Fa "void"
+.Fc
+.Sh DESCRIPTION
+The sqlite3_threadsafe() function returns zero if and only if SQLite
+was compiled with mutexing code omitted due to the SQLITE_THREADSAFE
+compile-time option being set to 0.
+.Pp
+SQLite can be compiled with or without mutexes.
+When the SQLITE_THREADSAFE C preprocessor macro is
+1 or 2, mutexes are enabled and SQLite is threadsafe.
+When the SQLITE_THREADSAFE macro is 0, the mutexes
+are omitted.
+Without the mutexes, it is not safe to use SQLite concurrently from
+more than one thread.
+.Pp
+Enabling mutexes incurs a measurable performance penalty.
+So if speed is of utmost importance, it makes sense to disable the
+mutexes.
+But for maximum safety, mutexes should be enabled.
+The default behavior is for mutexes to be enabled.
+.Pp
+This interface can be used by an application to make sure that the
+version of SQLite that it is linking against was compiled with the
+desired setting of the SQLITE_THREADSAFE macro.
+.Pp
+This interface only reports on the compile-time mutex setting of the
+SQLITE_THREADSAFE flag.
+If SQLite is compiled with SQLITE_THREADSAFE=1 or =2 then mutexes are
+enabled by default but can be fully or partially disabled using a call
+to
+.Fn sqlite3_config
+with the verbs SQLITE_CONFIG_SINGLETHREAD,
+SQLITE_CONFIG_MULTITHREAD, or SQLITE_CONFIG_SERIALIZED.
+The return value of the sqlite3_threadsafe() function shows only the
+compile-time setting of thread safety, not any run-time changes to
+that setting made by sqlite3_config().
+In other words, the return value from sqlite3_threadsafe() is unchanged
+by calls to sqlite3_config().
+.Pp
+See the threading mode documentation for additional information.
+.Sh IMPLEMENTATION NOTES
+These declarations were extracted from the
+interface documentation at line 221.
+.Bd -literal
+SQLITE_API int sqlite3_threadsafe(void);
+.Ed
+.Sh SEE ALSO
+.Xr sqlite3_config 3 ,
+.Xr SQLITE_CONFIG_SINGLETHREAD 3