I searched the web and came across this page where the developer tries SvOBJECT_off. Stas states, "So we get all kind of problems when automatically dereferencing it."

SvOK_off(sv);
SvIVX(sv) = 0;
SvOBJECT_off(sv);

[download]

It is warming to the heart (because of the frustrations at times folks hoping and/or making things threads-safe) to read, "A working solution is needed to make mp2 API perl-ithreads-safe as it's not at the moment, ...".

Stas settled with the following instead.

SV *sv = SvRV(obj);
if (sv) {
    /* detach from the C struct and invalidate */
    mg_free(sv); /* remove any magic */
    SvFLAGS(sv) = 0;  /* invalidate the sv */
}

[download]

I tried replacing SvOBJECT_off with mg_free in PDL 2.076.

/* Clear the sv field so that there will be no dangling ptrs */
if (it->sv) {
    // SvOBJECT_off((SV *)it->sv);  /* problematic, issue #385 */
    mg_free(it->sv);  /* remove any magic instead */
    sv_setiv(it->sv,0x4242);
    it->sv = NULL;
}

[download]

etj, will that work? The Strassen demonstrations work fine and see no adverse effects during global destruction.

In reply to Re^5: XS module in ithreads Perl much slower in threads::join after adding SvOBJECT_off by marioroy
in thread XS module in ithreads Perl much slower in threads::join after adding SvOBJECT_off by etj

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