check ferror() only if read() returned 0

[perl5.git] / thrdvar.h

/***********************************************/
/* Global only to current thread               */
/***********************************************/

/* Don't forget to re-run embed.pl to propagate changes! */

/* The 'T' prefix is only needed for vars that need appropriate #defines
 * generated when built with or without USE_THREADS.  It is also used
 * to generate the appropriate export list for win32.
 *
 * When building without USE_THREADS, these variables will be truly global.
 * When building without USE_THREADS but with MULTIPLICITY, these variables
 * will be global per-interpreter.
 *
 * Avoid build-specific #ifdefs here, like DEBUGGING.  That way,
 * we can keep binary compatibility of the curinterp structure */

/* Important ones in the first cache line (if alignment is done right) */

PERLVAR(Tstack_sp,	SV **)		/* top of the stack */
#ifdef OP_IN_REGISTER
PERLVAR(Topsave,	OP *)
#else
PERLVAR(Top,		OP *)		/* currently executing op */
#endif
PERLVAR(Tcurpad,	SV **)		/* active pad (lexicals+tmps) */

PERLVAR(Tstack_base,	SV **)
PERLVAR(Tstack_max,	SV **)

PERLVAR(Tscopestack,	I32 *)		/* scopes we've ENTERed */
PERLVAR(Tscopestack_ix,	I32)
PERLVAR(Tscopestack_max,I32)

PERLVAR(Tsavestack,	ANY *)		/* items that need to be restored
					   when LEAVEing scopes we've ENTERed */
PERLVAR(Tsavestack_ix,	I32)
PERLVAR(Tsavestack_max,	I32)

PERLVAR(Ttmps_stack,	SV **)		/* mortals we've made */
PERLVARI(Ttmps_ix,	I32,	-1)
PERLVARI(Ttmps_floor,	I32,	-1)
PERLVAR(Ttmps_max,	I32)

PERLVAR(Tmarkstack,	I32 *)		/* stack_sp locations we're remembering */
PERLVAR(Tmarkstack_ptr,	I32 *)
PERLVAR(Tmarkstack_max,	I32 *)

PERLVAR(Tretstack,	OP **)		/* OPs we have postponed executing */
PERLVAR(Tretstack_ix,	I32)
PERLVAR(Tretstack_max,	I32)

PERLVAR(TSv,		SV *)		/* used to hold temporary values */
PERLVAR(TXpv,		XPV *)		/* used to hold temporary values */

/* stat stuff */
PERLVAR(Tstatbuf,	Stat_t)
PERLVAR(Tstatcache,	Stat_t)		/* _ */
PERLVAR(Tstatgv,	GV *)
PERLVARI(Tstatname,	SV *,	Nullsv)

#ifdef HAS_TIMES
PERLVAR(Ttimesbuf,	struct tms)
#endif

/* Fields used by magic variables such as $@, $/ and so on */
PERLVAR(Ttainted,	bool)		/* using variables controlled by $< */
PERLVAR(Tcurpm,		PMOP *)		/* what to do \ interps in REs from */
PERLVAR(Tnrs,		SV *)
PERLVAR(Trs,		SV *)		/* input record separator $/ */
PERLVAR(Tlast_in_gv,	GV *)		/* GV used in last <FH> */
PERLVAR(Tofs,		char *)		/* output field separator $, */
PERLVAR(Tofslen,	STRLEN)
PERLVAR(Tdefoutgv,	GV *)		/* default FH for output */
PERLVARI(Tchopset,	char *,	" \n-")	/* $: */
PERLVAR(Tformtarget,	SV *)
PERLVAR(Tbodytarget,	SV *)
PERLVAR(Ttoptarget,	SV *)

/* Stashes */
PERLVAR(Tdefstash,	HV *)		/* main symbol table */
PERLVAR(Tcurstash,	HV *)		/* symbol table for current package */

PERLVAR(Trestartop,	OP *)		/* propagating an error from croak? */
PERLVARI(Tcurcop,	COP * VOL,	&compiling)
PERLVAR(Tin_eval,	VOL int)	/* trap "fatal" errors? */
PERLVAR(Tdelaymagic,	int)		/* ($<,$>) = ... */
PERLVAR(Tdirty,		bool)		/* in the middle of tearing things down? */
PERLVAR(Tlocalizing,	int)		/* are we processing a local() list? */

PERLVAR(Tcurstack,	AV *)		/* THE STACK */
PERLVAR(Tcurstackinfo,	PERL_SI *)	/* current stack + context */
PERLVAR(Tmainstack,	AV *)		/* the stack when nothing funny is happening */
PERLVAR(Ttop_env,	JMPENV *)	/* ptr. to current sigjmp() environment */
PERLVAR(Tstart_env,	JMPENV)		/* empty startup sigjmp() environment */

/* statics "owned" by various functions */
PERLVAR(Tav_fetch_sv,	SV *)		/* owned by av_fetch() */
PERLVAR(Thv_fetch_sv,	SV *)		/* owned by hv_fetch() */
PERLVAR(Thv_fetch_ent_mh, HE)		/* owned by hv_fetch_ent() */

PERLVAR(Tmodcount,	I32)		/* how much mod()ification in assignment? */

PERLVAR(Tlastgotoprobe,	OP*)		/* from pp_ctl.c */

/* sort stuff */
PERLVAR(Tsortcop,	OP *)		/* user defined sort routine */
PERLVAR(Tsortstash,	HV *)		/* which is in some package or other */
PERLVAR(Tfirstgv,	GV *)		/* $a */
PERLVAR(Tsecondgv,	GV *)		/* $b */
PERLVAR(Tsortcxix,	I32)		/* from pp_ctl.c */

/* regex stuff */

PERLVAR(Tscreamfirst,	I32 *)
PERLVAR(Tscreamnext,	I32 *)
PERLVARI(Tmaxscream,	I32,	-1)
PERLVAR(Tlastscream,	SV *)

PERLVAR(Tregdummy,	regnode)	/* from regcomp.c */
PERLVAR(Tregcomp_parse,	char*)		/* Input-scan pointer. */
PERLVAR(Tregxend,	char*)		/* End of input for compile */
PERLVAR(Tregcode,	regnode*)	/* Code-emit pointer; &regdummy = don't */
PERLVAR(Tregnaughty,	I32)		/* How bad is this pattern? */
PERLVAR(Tregsawback,	I32)		/* Did we see \1, ...? */
PERLVAR(Tregprecomp,	char *)		/* uncompiled string. */
PERLVAR(Tregnpar,	I32)		/* () count. */
PERLVAR(Tregsize,	I32)		/* Code size. */
PERLVAR(Tregflags,	U16)		/* are we folding, multilining? */
PERLVAR(Tregseen,	U32)		/* from regcomp.c */
PERLVAR(Tseen_zerolen,	I32)		/* from regcomp.c */
PERLVAR(Tseen_evals,	I32)		/* from regcomp.c */
PERLVAR(Tregcomp_rx,	regexp *)	/* from regcomp.c */
PERLVAR(Textralen,	I32)		/* from regcomp.c */
PERLVAR(Tcolorset,	int)		/* from regcomp.c */
PERLVAR(Tcolors[4],	char *)		/* from regcomp.c */
PERLVAR(Treginput,	char *)		/* String-input pointer. */
PERLVAR(Tregbol,	char *)		/* Beginning of input, for ^ check. */
PERLVAR(Tregeol,	char *)		/* End of input, for $ check. */
PERLVAR(Tregstartp,	char **)	/* Pointer to startp array. */
PERLVAR(Tregendp,	char **)	/* Ditto for endp. */
PERLVAR(Treglastparen,	U32 *)		/* Similarly for lastparen. */
PERLVAR(Tregtill,	char *)		/* How far we are required to go. */
PERLVAR(Tregprev,	char)		/* char before regbol, \n if none */
PERLVAR(Treg_start_tmp,	char **)	/* from regexec.c */
PERLVAR(Treg_start_tmpl,U32)		/* from regexec.c */
PERLVAR(Tregdata,	struct reg_data *)
					/* from regexec.c renamed was data */
PERLVAR(Tbostr,		char *)		/* from regexec.c */
PERLVAR(Treg_flags,	U32)		/* from regexec.c */
PERLVAR(Treg_eval_set,	I32)		/* from regexec.c */
PERLVAR(Tregnarrate,	I32)		/* from regexec.c */
PERLVAR(Tregprogram,	regnode *)	/* from regexec.c */
PERLVARI(Tregindent,	int,	    0)	/* from regexec.c */
PERLVAR(Tregcc,		CURCUR *)	/* from regexec.c */

PERLVARI(Tregcompp,	regcomp_t, FUNC_NAME_TO_PTR(pregcomp))
					/* Pointer to RE compiler */
PERLVARI(Tregexecp,	regexec_t, FUNC_NAME_TO_PTR(regexec_flags))
					/* Pointer to RE executer */
PERLVARI(Treginterp_cnt,int,	    0)	/* Whether `Regexp'
						   was interpolated. */


/* Note that the variables below are all explicitly referenced in the code
 * as thr->whatever and therefore don't need the 'T' prefix. */

#ifdef USE_THREADS

PERLVAR(oursv,		SV *)
PERLVAR(cvcache,	HV *)
PERLVAR(self,		perl_os_thread)	/* Underlying thread object */
PERLVAR(flags,		U32)
PERLVAR(threadsv,	AV *)		/* Per-thread SVs ($_, $@ etc.) */
PERLVAR(threadsvp,	SV **)		/* AvARRAY(threadsv) */
PERLVAR(specific,	AV *)		/* Thread-specific user data */
PERLVAR(errsv,		SV *)		/* Backing SV for $@ */
PERLVAR(errhv,		HV *)		/* HV for what was %@ in pp_ctl.c */
PERLVAR(mutex,		perl_mutex)	/* For the fields others can change */
PERLVAR(tid,		U32)
PERLVAR(prev,		struct perl_thread *)
PERLVAR(next,		struct perl_thread *)
					/* Circular linked list of threads */

#ifdef HAVE_THREAD_INTERN
PERLVAR(i,		struct thread_intern)
					/* Platform-dependent internals */
#endif

PERLVAR(trailing_nul,	char)		/* For the sake of thrsv and oursv */

#endif /* USE_THREADS */