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#ifdef USE_ITHREADS
typedef struct {
SV* sv; /* The actual data */
perl_mutex mutex; /* Our mutex */
perl_cond cond; /* Our condition variable */
IV locks; /* Number of locks held */
PerlInterpreter* owner; /* who owns the lock */
} shared_sv;
extern PerlInterpreter* sharedsv_space;
void Perl_sharedsv_unlock_scope(pTHX_ shared_sv* ssv);
void Perl_sharedsv_unlock(pTHX_ shared_sv* ssv);
void Perl_sharedsv_lock(pTHX_ shared_sv* ssv);
void Perl_sharedsv_init(pTHX);
shared_sv* Perl_sharedsv_new(pTHX);
shared_sv* Perl_sharedsv_find(pTHX_ SV* sv);
void Perl_sharedsv_thrcnt_inc(pTHX_ shared_sv* ssv);
void Perl_sharedsv_thrcnt_dec(pTHX_ shared_sv* ssv);
#define SHAREDSvGET(a) (a->sv)
#define SHAREDSvEDIT(a) PERL_SET_CONTEXT(sharedsv_space)
#define SHAREDSvRELEASE(a) PERL_SET_CONTEXT(my_perl)
#define SHAREDSvLOCK(a) Perl_sharedsv_lock(aTHX_ a)
#define SHAREDSvUNLOCK(a) Perl_sharedsv_unlock(aTHX_ a)
#endif /* USE_ITHREADS */
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