START_MY_CXT dMY_CXT_SV dMY_CXT MY_CXT_INIT MY_CXT_CLONE MY_CXT pMY_CXT pMY_CXT_ _pMY_CXT aMY_CXT aMY_CXT_ _aMY_CXT

/* * Boilerplate macros for initializing and accessing interpreter-local * data from C. All statics in extensions should be reworked to use * this, if you want to make the extension thread-safe. See ext/re/re.xs * for an example of the use of these macros. * * Code that uses these macros is responsible for the following: * 1. #define MY_CXT_KEY to a unique string, e.g. "DynaLoader_guts" * 2. Declare a typedef named my_cxt_t that is a structure that contains * all the data that needs to be interpreter-local. * 3. Use the START_MY_CXT macro after the declaration of my_cxt_t. * 4. Use the MY_CXT_INIT macro such that it is called exactly once * (typically put in the BOOT: section). * 5. Use the members of the my_cxt_t structure everywhere as * MY_CXT.member. * 6. Use the dMY_CXT macro (a declaration) in all the functions that * access MY_CXT. */

#if defined(MULTIPLICITY) || defined(PERL_OBJECT) || \ defined(PERL_CAPI) || defined(PERL_IMPLICIT_CONTEXT)

#ifndef START_MY_CXT

/* This must appear in all extensions that define a my_cxt_t structure, * right after the definition (i.e. at file scope). The non-threads * case below uses it to declare the data as static. */ #define START_MY_CXT

#if { VERSION < 5.004_68 } /* Fetches the SV that keeps the per-interpreter data. */ #define dMY_CXT_SV \ SV *my_cxt_sv = get_sv(MY_CXT_KEY, FALSE) #else /* >= perl5.004_68 */ #define dMY_CXT_SV \ SV *my_cxt_sv = *hv_fetch(PL_modglobal, MY_CXT_KEY, \ sizeof(MY_CXT_KEY)-1, TRUE) #endif /* < perl5.004_68 */

/* This declaration should be used within all functions that use the * interpreter-local data. */ #define dMY_CXT \ dMY_CXT_SV; \ my_cxt_t *my_cxtp = INT2PTR(my_cxt_t*,SvUV(my_cxt_sv))

/* Creates and zeroes the per-interpreter data. * (We allocate my_cxtp in a Perl SV so that it will be released when * the interpreter goes away.) */ #define MY_CXT_INIT \ dMY_CXT_SV; \ /* newSV() allocates one more than needed */ \ my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1));\ Zero(my_cxtp, 1, my_cxt_t); \ sv_setuv(my_cxt_sv, PTR2UV(my_cxtp))

/* This macro must be used to access members of the my_cxt_t structure. * e.g. MYCXT.some_data */ #define MY_CXT (*my_cxtp)

/* Judicious use of these macros can reduce the number of times dMY_CXT * is used. Use is similar to pTHX, aTHX etc. */ #define pMY_CXT my_cxt_t *my_cxtp #define pMY_CXT_ pMY_CXT, #define _pMY_CXT ,pMY_CXT #define aMY_CXT my_cxtp #define aMY_CXT_ aMY_CXT, #define _aMY_CXT ,aMY_CXT

#endif /* START_MY_CXT */

#ifndef MY_CXT_CLONE /* Clones the per-interpreter data. */ #define MY_CXT_CLONE \ dMY_CXT_SV; \ my_cxt_t *my_cxtp = (my_cxt_t*)SvPVX(newSV(sizeof(my_cxt_t)-1));\ Copy(INT2PTR(my_cxt_t*, SvUV(my_cxt_sv)), my_cxtp, 1, my_cxt_t);\ sv_setuv(my_cxt_sv, PTR2UV(my_cxtp)) #endif

#else /* single interpreter */

#ifndef START_MY_CXT

#define START_MY_CXT static my_cxt_t my_cxt; #define dMY_CXT_SV dNOOP #define dMY_CXT dNOOP #define MY_CXT_INIT NOOP #define MY_CXT my_cxt

#define pMY_CXT void #define pMY_CXT_ #define _pMY_CXT #define aMY_CXT #define aMY_CXT_ #define _aMY_CXT

#endif /* START_MY_CXT */

#ifndef MY_CXT_CLONE #define MY_CXT_CLONE NOOP #endif

#endif

#define MY_CXT_KEY "Devel::PPPort::_guts" XS_VERSION

typedef struct { /* Put Global Data in here */ int dummy; } my_cxt_t;

START_MY_CXT

{ MY_CXT_INIT; /* If any of the fields in the my_cxt_t struct need * to be initialised, do it here. */ MY_CXT.dummy = 42; }

int MY_CXT_1() CODE: dMY_CXT; RETVAL = MY_CXT.dummy == 42; ++MY_CXT.dummy; OUTPUT: RETVAL

int MY_CXT_2() CODE: dMY_CXT; RETVAL = MY_CXT.dummy == 43; OUTPUT: RETVAL

int MY_CXT_CLONE() CODE: MY_CXT_CLONE; RETVAL = 42; OUTPUT: RETVAL

ok(&Devel::PPPort::MY_CXT_1()); ok(&Devel::PPPort::MY_CXT_2()); ok(&Devel::PPPort::MY_CXT_CLONE());