-//depot/perl/pod/perldiag.pod#272 - edit change 14824 (text)
=head1 NAME
perldiag - various Perl diagnostics
=over 4
+=item A thread exited while %d other threads were still running
+
+(W) When using threaded Perl, a thread (not necessarily the main
+thread) exited while there were still other threads running.
+Usually it's a good idea to first collect the return values of the
+created threads by joining them, and only then exit from then main
+thread. See L<threads>.
+
=item accept() on closed socket %s
(W closed) You tried to do an accept on a closed socket. Did you forget
must either both be scalars or both be lists. Otherwise Perl won't
know which context to supply to the right side.
-=item Attempt to access disallowed key '%s' in a fixed hash
+=item Attempt to access disallowed key '%s' in a restricted hash
(F) The failing code has attempted to get or set a key which is not in
-the current set of allowed keys of a fixed hash.
+the current set of allowed keys of a restricted hash.
-=item Attempt to clear a fixed hash
+=item Attempt to clear a restricted hash
-(F) It is currently not allowed to clear a fixed hash, even if the
+(F) It is currently not allowed to clear a restricted hash, even if the
new hash would contain the same keys as before. This may change in
the future.
-=item Attempt to delete readonly key '%s' from a fixed hash
+=item Attempt to delete readonly key '%s' from a restricted hash
(F) The failing code attempted to delete a key whose value has been
-declared readonly from a fixed hash.
+declared readonly from a restricted hash.
-=item Attempt to delete disallowed key '%s' from a fixed hash
+=item Attempt to delete disallowed key '%s' from a restricted hash
-(F) The failing code attempted to delete from a fixed hash a key which
-is not in its key set.
+(F) The failing code attempted to delete from a restricted hash a key
+which is not in its key set.
=item Attempt to bless into a reference
=item Can't find %s property definition %s
(F) You may have tried to use C<\p> which means a Unicode property for
-example \p{Lu} is all uppercase letters. Escape the C<\p>, either
+example \p{Lu} is all uppercase letters. if you did mean to use a
+Unicode property, see L<perlunicode> for the list of known properties.
+If you didn't mean to use a Unicode property, escape the C<\p>, either
C<\\p> (just the C<\p>) or by C<\Q\p> (the rest of the string, until
possible C<\E>).
is because you don't have read permission for a file which you named on
the command line.
+=item Can't open a reference
+
+(W io) You tried to open a scalar reference for reading or writing,
+using the 3-arg open() syntax :
+
+ open FH, '>', $ref;
+
+but your version of perl is compiled without perlio, and this form of
+open is not supported.
+
=item Can't open bidirectional pipe
(W pipe) You tried to say C<open(CMD, "|cmd|")>, which is not supported.
that it is simpler or backtracks less. (See L<perlfaq2> for information
on I<Mastering Regular Expressions>.)
+=item cond_broadcast() called on unlocked variable
+
+(W threads) Within a thread-enabled program, you tried to call
+cond_broadcast() on a variable which wasn't locked. The cond_broadcast()
+function is used to wake up another thread that is waiting in a
+cond_wait(). To ensure that the signal isn't sent before the other thread
+has a chance to enter the wait, it is usual for the signaling thread to
+first wait for a lock on variable. This lock attempt will only succeed
+after the other thread has entered cond_wait() and thus relinquished the
+lock.
+
+
+=item cond_signal() called on unlocked variable
+
+(W threads) Within a thread-enabled program, you tried to call
+cond_signal() on a variable which wasn't locked. The cond_signal()
+function is used to wake up another thread that is waiting in a
+cond_wait(). To ensure that the signal isn't sent before the other thread
+has a chance to enter the wait, it is usual for the signaling thread to
+first wait for a lock on variable. This lock attempt will only succeed
+after the other thread has entered cond_wait() and thus relinquished the
+lock.
+
=item connect() on closed socket %s
(W closed) You tried to do a connect on a closed socket. Did you forget
=item Constant subroutine %s redefined
-(S|W redefine) You redefined a subroutine which had previously been
+(S) You redefined a subroutine which had previously been
eligible for inlining. See L<perlsub/"Constant Functions"> for
commentary and workarounds.
=item Empty %s
-(F) Empty C<\p{}> or C<\P{}>.
+(F) C<\p> and C<\P> are used to introduce a named Unicode property, as
+described in L<perlunicode> and L<perlre>. You used C<\p> or C<\P> in
+a regular expression without specifying the property name.
=item entering effective %s failed
Perl detected something that didn't comply with UTF-8 encoding rules.
+One possible cause is that you read in data that you thought to be in
+UTF-8 but it wasn't (it was for example legacy 8-bit data). Another
+possibility is careless use of utf8::upgrade().
+
=item Malformed UTF-16 surrogate
Perl thought it was reading UTF-16 encoded character data but while
(F) The second argument of 3-argument open() is not among the list
of valid modes: C<< < >>, C<< > >>, C<<< >> >>>, C<< +< >>,
-C<< +> >>, C<<< +>> >>>, C<-|>, C<|->.
+C<< +> >>, C<<< +>> >>>, C<-|>, C<|->, C<< <& >>, C<< >& >>.
=item Unknown process %x sent message to prime_env_iter: %s
(D deprecated) You are now encouraged to use the explicitly quoted form
if you wish to use an empty line as the terminator of the here-document.
+=item Use of /c modifier is meaningless in s///
+
+(W regexp) You used the /c modifier in a substitution. The /c
+modifier is not presently meaningful in substitutions.
+
+=item Use of /c modifier is meaningless without /g
+
+(W regexp) You used the /c modifier with a regex operand, but didn't
+use the /g modifier. Currently, /c is meaningful only when /g is
+used. (This may change in the future.)
+
+=item Use of /g modifier is meaningless in split
+
+(W regexp) You used the /g modifier on the pattern for a C<split>
+operator. Since C<split> always tries to match the pattern
+repeatedly, the C</g> has no effect.
+
=item Use of *glob{FILEHANDLE} is deprecated
(D deprecated) You are now encouraged to use the shorter *glob{IO} form
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