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| -rw-r--r-- | pod/perlhacktips.pod | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/pod/perlhacktips.pod b/pod/perlhacktips.pod index 6c335507ce..dba0d405ff 100644 --- a/pod/perlhacktips.pod +++ b/pod/perlhacktips.pod @@ -1460,10 +1460,11 @@ L<perlclib>. Under ithreads the optree is read only. If you want to enforce this, to check for write accesses from buggy code, compile with -C<-DPL_OP_SLAB_ALLOC> to enable the OP slab allocator and +C<-DPL_OP_SLAB_ALLOC> to enable the old OP slab allocator and C<-DPERL_DEBUG_READONLY_OPS> to enable code that allocates op memory -via C<mmap>, and sets it read-only at run time. Any write access to an -op results in a C<SIGBUS> and abort. +via C<mmap>, and sets it read-only at run time. (PERL_DEBUG_READONLY_OPS +has not been rewritten for the new slab allocator, so op trees may leak.) +Any write access to an op results in a C<SIGBUS> and abort. This code is intended for development only, and may not be portable even to all Unix variants. Also, it is an 80% solution, in that it |