Updates to the sqlite3_progress_handler() documentation.

FossilOrigin-Name: 78f659ee9bb60df3503998301b554fe81fa6bdd3

manifest

@@ -1,5 +1,8 @@
-C Add\stests\sfor\sORDER\sBY\sclauses\sto\se_select.test.
-D 2010-09-15T19:02:15
+-----BEGIN PGP SIGNED MESSAGE-----
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+C Updates\sto\sthe\ssqlite3_progress_handler()\sdocumentation.
+D 2010-09-15T23:41:24
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in c599a15d268b1db2aeadea19df2adc3bf2eb6bee
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -174,7 +177,7 @@ F src/resolve.c 1c0f32b64f8e3f555fe1f732f9d6f501a7f05706
 F src/rowset.c 69afa95a97c524ba6faf3805e717b5b7ae85a697
 F src/select.c b0b124781474e4e0c8f64022875e5e2009e13443
 F src/shell.c 8517fc1f9c59ae4007e6cc8b9af91ab231ea2056
-F src/sqlite.h.in f12039ff7abd1de321a799023e9611747a25cbf8
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src/sqlite.h.in

@@ -2207,17 +2207,28 @@ SQLITE_EXPERIMENTAL void *sqlite3_profile(sqlite3*,
 /*
 ** CAPI3REF: Query Progress Callbacks
 **
-** ^This routine configures a callback function - the
-** progress callback - that is invoked periodically during long
-** running calls to [sqlite3_exec()], [sqlite3_step()] and
-** [sqlite3_get_table()].  An example use for this
+** ^The sqlite3_progress_handler(D,N,X,P) interface causes the callback
+** function X to be invoked periodically during long running calls to
+** [sqlite3_exec()], [sqlite3_step()] and [sqlite3_get_table()] for
+** database connection D.  An example use for this
 ** interface is to keep a GUI updated during a large query.
 **
+** ^The parameter P is passed through as the only parameter to the 
+** callback function X.  ^The parameter N is the number of 
+** [virtual machine instructions] that are evaluated between successive
+** invocations of the callback X.
+**
+** ^Only a single progress handler may be defined at one time per
+** [database connection]; setting a new progress handler cancels the
+** old one.  ^Setting parameter X to NULL disables the progress handler.
+** ^The progress handler is also disabled by setting N to a value less
+** than 1.
+**
 ** ^If the progress callback returns non-zero, the operation is
 ** interrupted.  This feature can be used to implement a
 ** "Cancel" button on a GUI progress dialog box.
 **
-** The progress handler must not do anything that will modify
+** The progress handler callback must not do anything that will modify
 ** the database connection that invoked the progress handler.
 ** Note that [sqlite3_prepare_v2()] and [sqlite3_step()] both modify their
 ** database connections for the meaning of "modify" in this paragraph.