[p5sagit/p5-mst-13.2.git] / thread.h

#ifdef USE_THREADS

#ifdef WIN32
#  include <win32thread.h>
#else
#  ifdef OLD_PTHREADS_API /* Here be dragons. */
#    define DETACH(t)				\
    STMT_START {				\
	if (pthread_detach(&(t)->self)) {	\
	    MUTEX_UNLOCK(&(t)->mutex);		\
	    croak("panic: DETACH");		\
	}					\
    } STMT_END
#    define THR getTHR()
struct perl_thread *getTHR _((void));
#    define PTHREAD_GETSPECIFIC_INT
#    ifdef DJGPP
#      define pthread_addr_t any_t
#      define NEED_PTHREAD_INIT
#      define PTHREAD_CREATE_JOINABLE (1)
#    endif
#    ifdef __OPEN_VM
#      define pthread_addr_t void *
#    endif
#    ifdef VMS
#      define pthread_attr_init(a) pthread_attr_create(a)
#      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
#      define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
#      define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
#      define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
#      define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
#    endif
#    if defined(DJGPP) || defined(__OPEN_VM)
#      define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
#      define YIELD pthread_yield(NULL)
#    endif
#  endif
#  ifndef VMS
#    define pthread_mutexattr_default NULL
#    define pthread_condattr_default  NULL
#  endif
#endif

#ifndef PTHREAD_CREATE
/* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
#  define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
#endif

#ifndef PTHREAD_ATTR_SETDETACHSTATE
#  define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
#endif

#ifdef I_MACH_CTHREADS

/* cthreads interface */

/* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */

#define MUTEX_INIT(m)					\
	STMT_START {					\
		*m = mutex_alloc();			\
		if (*m) {				\
			mutex_init(*m);			\
		} else {				\
			croak("panic: MUTEX_INIT");	\
		}					\
	} STMT_END

#define MUTEX_LOCK(m)		mutex_lock(*m)
#define MUTEX_UNLOCK(m)		mutex_unlock(*m)
#define MUTEX_DESTROY(m)				\
	STMT_START {					\
		mutex_free(*m);				\
		*m = 0;					\
	} STMT_END

#define COND_INIT(c)					\
	STMT_START {					\
		*c = condition_alloc();			\
		if (*c) {				\
			condition_init(*c);		\
		} else {				\
			croak("panic: COND_INIT");	\
		}					\
	} STMT_END

#define COND_SIGNAL(c)		condition_signal(*c)
#define COND_BROADCAST(c)	condition_broadcast(*c)
#define COND_WAIT(c, m)		condition_wait(*c, *m)
#define COND_DESTROY(c)				\
	STMT_START {				\
		condition_free(*c);		\
		*c = 0;				\
	} STMT_END

#define THREAD_CREATE(thr, f)	(thr->self = cthread_fork(f, thr), 0)
#define THREAD_POST_CREATE(thr)

#define THREAD_RET_TYPE		any_t
#define THREAD_RET_CAST(x)	((any_t) x)

#define DETACH(t)		cthread_detach(t->self)
#define JOIN(t, avp)		(*(avp) = (AV *)cthread_join(t->self))

#define SET_THR(thr)		cthread_set_data(cthread_self(), thr)
#define THR			cthread_data(cthread_self())

#define INIT_THREADS		cthread_init()
#define YIELD			cthread_yield()
#define ALLOC_THREAD_KEY
#define SET_THREAD_SELF(thr)	(thr->self = cthread_self())

#endif /* I_MACH_CTHREADS */

#ifndef YIELD
#  ifdef SCHED_YIELD
#    define YIELD SCHED_YIELD
#  else
#    ifdef HAS_SCHED_YIELD
#      define YIELD sched_yield()
#    else
#      ifdef HAS_PTHREAD_YIELD
    /* pthread_yield(NULL) platforms are expected
     * to have #defined YIELD for themselves. */
#        define YIELD pthread_yield()
#      endif
#    endif
#  endif
#endif

#ifndef MUTEX_INIT
#define MUTEX_INIT(m)						\
    STMT_START {						\
	if (pthread_mutex_init((m), pthread_mutexattr_default))	\
	    croak("panic: MUTEX_INIT");				\
    } STMT_END
#define MUTEX_LOCK(m)				\
    STMT_START {				\
	if (pthread_mutex_lock((m)))		\
	    croak("panic: MUTEX_LOCK");		\
    } STMT_END
#define MUTEX_UNLOCK(m)				\
    STMT_START {				\
	if (pthread_mutex_unlock((m)))		\
	    croak("panic: MUTEX_UNLOCK");	\
    } STMT_END
#define MUTEX_DESTROY(m)			\
    STMT_START {				\
	if (pthread_mutex_destroy((m)))		\
	    croak("panic: MUTEX_DESTROY");	\
    } STMT_END
#endif /* MUTEX_INIT */

#ifndef COND_INIT
#define COND_INIT(c)						\
    STMT_START {						\
	if (pthread_cond_init((c), pthread_condattr_default))	\
	    croak("panic: COND_INIT");				\
    } STMT_END
#define COND_SIGNAL(c)				\
    STMT_START {				\
	if (pthread_cond_signal((c)))		\
	    croak("panic: COND_SIGNAL");	\
    } STMT_END
#define COND_BROADCAST(c)			\
    STMT_START {				\
	if (pthread_cond_broadcast((c)))	\
	    croak("panic: COND_BROADCAST");	\
    } STMT_END
#define COND_WAIT(c, m)				\
    STMT_START {				\
	if (pthread_cond_wait((c), (m)))	\
	    croak("panic: COND_WAIT");		\
    } STMT_END
#define COND_DESTROY(c)				\
    STMT_START {				\
	if (pthread_cond_destroy((c)))		\
	    croak("panic: COND_DESTROY");	\
    } STMT_END
#endif /* COND_INIT */

/* DETACH(t) must only be called while holding t->mutex */
#ifndef DETACH
#define DETACH(t)				\
    STMT_START {				\
	if (pthread_detach((t)->self)) {	\
	    MUTEX_UNLOCK(&(t)->mutex);		\
	    croak("panic: DETACH");		\
	}					\
    } STMT_END
#endif /* DETACH */

#ifndef JOIN
#define JOIN(t, avp) 					\
    STMT_START {					\
	if (pthread_join((t)->self, (void**)(avp)))	\
	    croak("panic: pthread_join");		\
    } STMT_END
#endif /* JOIN */

#ifndef SET_THR
#define SET_THR(t)					\
    STMT_START {					\
	if (pthread_setspecific(PL_thr_key, (void *) (t)))	\
	    croak("panic: pthread_setspecific");	\
    } STMT_END
#endif /* SET_THR */

#ifndef THR
#define THR ((struct perl_thread *) pthread_getspecific(PL_thr_key))
#endif

/*
 * dTHR is performance-critical. Here, we only do the pthread_get_specific
 * if there may be more than one thread in existence, otherwise we get thr
 * from thrsv which is cached in the per-interpreter structure.
 * Systems with very fast pthread_get_specific (which should be all systems
 * but unfortunately isn't) may wish to simplify to "...*thr = THR".
 */
#ifndef dTHR
#  define dTHR \
    struct perl_thread *thr = PL_threadnum? THR : (struct perl_thread*)SvPVX(PL_thrsv)
#endif /* dTHR */

#ifndef INIT_THREADS
#  ifdef NEED_PTHREAD_INIT
#    define INIT_THREADS pthread_init()
#  else
#    define INIT_THREADS NOOP
#  endif
#endif

/* Accessor for per-thread SVs */
#define THREADSV(i) (thr->threadsvp[i])

/*
 * LOCK_SV_MUTEX and UNLOCK_SV_MUTEX are performance-critical. Here, we
 * try only locking them if there may be more than one thread in existence.
 * Systems with very fast mutexes (and/or slow conditionals) may wish to
 * remove the "if (threadnum) ..." test.
 */
#define LOCK_SV_MUTEX				\
    STMT_START {				\
	if (PL_threadnum)			\
	    MUTEX_LOCK(&PL_sv_mutex);		\
    } STMT_END

#define UNLOCK_SV_MUTEX				\
    STMT_START {				\
	if (PL_threadnum)			\
	    MUTEX_UNLOCK(&PL_sv_mutex);		\
    } STMT_END

/* Likewise for strtab_mutex */
#define LOCK_STRTAB_MUTEX			\
    STMT_START {				\
	if (PL_threadnum)			\
	    MUTEX_LOCK(&PL_strtab_mutex);	\
    } STMT_END

#define UNLOCK_STRTAB_MUTEX			\
    STMT_START {				\
	if (PL_threadnum)			\
	    MUTEX_UNLOCK(&PL_strtab_mutex);	\
    } STMT_END

#ifndef THREAD_RET_TYPE
#  define THREAD_RET_TYPE	void *
#  define THREAD_RET_CAST(p)	((void *)(p))
#endif /* THREAD_RET */


/* Values and macros for thr->flags */
#define THRf_STATE_MASK	7
#define THRf_R_JOINABLE	0
#define THRf_R_JOINED	1
#define THRf_R_DETACHED	2
#define THRf_ZOMBIE	3
#define THRf_DEAD	4

#define THRf_DID_DIE	8

/* ThrSTATE(t) and ThrSETSTATE(t) must only be called while holding t->mutex */
#define ThrSTATE(t) ((t)->flags & THRf_STATE_MASK)
#define ThrSETSTATE(t, s) STMT_START {		\
	(t)->flags &= ~THRf_STATE_MASK;		\
	(t)->flags |= (s);			\
	DEBUG_S(PerlIO_printf(PerlIO_stderr(),	\
			      "thread %p set to state %d\n", (t), (s))); \
    } STMT_END

typedef struct condpair {
    perl_mutex	mutex;		/* Protects all other fields */
    perl_cond	owner_cond;	/* For when owner changes at all */
    perl_cond	cond;		/* For cond_signal and cond_broadcast */
    Thread	owner;		/* Currently owning thread */
} condpair_t;

#define MgMUTEXP(mg) (&((condpair_t *)(mg->mg_ptr))->mutex)
#define MgOWNERCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->owner_cond)
#define MgCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->cond)
#define MgOWNER(mg) ((condpair_t *)(mg->mg_ptr))->owner

#else
/* USE_THREADS is not defined */
#define MUTEX_LOCK(m)
#define MUTEX_UNLOCK(m)
#define MUTEX_INIT(m)
#define MUTEX_DESTROY(m)
#define COND_INIT(c)
#define COND_SIGNAL(c)
#define COND_BROADCAST(c)
#define COND_WAIT(c, m)
#define COND_DESTROY(c)
#define LOCK_SV_MUTEX
#define UNLOCK_SV_MUTEX
#define LOCK_STRTAB_MUTEX
#define UNLOCK_STRTAB_MUTEX

#define THR
/* Rats: if dTHR is just blank then the subsequent ";" throws an error */
#ifdef WIN32
#define dTHR extern int Perl___notused
#else
#define dTHR extern int errno
#endif
#endif /* USE_THREADS */
Commit	Line	Data
ea0efc06	1	#ifdef USE_THREADS
12ca11f6	2
ea0efc06	3	#ifdef WIN32
d55594ae	4	# include <win32thread.h>
d55594ae	5	#else
0d85d877	6	# ifdef OLD_PTHREADS_API /* Here be dragons. */
1cfa4ec7	7	# define DETACH(t) \
ea0efc06	8	STMT_START { \
46930d8f	9	if (pthread_detach(&(t)->self)) { \
ea0efc06	10	MUTEX_UNLOCK(&(t)->mutex); \
	11	croak("panic: DETACH"); \
	12	} \
	13	} STMT_END
9bbd4fab	14	# define THR getTHR()
0d85d877	15	struct perl_thread *getTHR _((void));
	16	# define PTHREAD_GETSPECIFIC_INT
	17	# ifdef DJGPP
	18	# define pthread_addr_t any_t
	19	# define NEED_PTHREAD_INIT
6dc3770d	20	# define PTHREAD_CREATE_JOINABLE (1)
0d85d877	21	# endif
	22	# ifdef __OPEN_VM
	23	# define pthread_addr_t void *
	24	# endif
	25	# ifdef VMS
	26	# define pthread_attr_init(a) pthread_attr_create(a)
	27	# define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_setdetach_np(a,s)
6dc3770d	28	# define PTHREAD_CREATE(t,a,s,d) pthread_create(t,a,s,d)
0d85d877	29	# define pthread_key_create(k,d) pthread_keycreate(k,(pthread_destructor_t)(d))
0d85d877	30	# define pthread_mutexattr_init(a) pthread_mutexattr_create(a)
9bbd4fab	31	# define pthread_mutexattr_settype(a,t) pthread_mutexattr_setkind_np(a,t)
0d85d877	32	# endif
	33	# if defined(DJGPP) \|\| defined(__OPEN_VM)
	34	# define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,&(s))
	35	# define YIELD pthread_yield(NULL)
	36	# endif
0d85d877	37	# endif
0d85d877	38	# ifndef VMS
1cfa4ec7	39	# define pthread_mutexattr_default NULL
0d85d877	40	# define pthread_condattr_default NULL
	41	# endif
	42	#endif
	43
	44	#ifndef PTHREAD_CREATE
	45	/* You are not supposed to pass NULL as the 2nd arg of PTHREAD_CREATE(). */
	46	# define PTHREAD_CREATE(t,a,s,d) pthread_create(t,&(a),s,d)
	47	#endif
	48
	49	#ifndef PTHREAD_ATTR_SETDETACHSTATE
	50	# define PTHREAD_ATTR_SETDETACHSTATE(a,s) pthread_attr_setdetachstate(a,s)
d55594ae	51	#endif
1cfa4ec7	52
7f3d1cf1	53	#ifdef I_MACH_CTHREADS
	54
	55	/* cthreads interface */
	56
	57	/* #include <mach/cthreads.h> is in perl.h #ifdef I_MACH_CTHREADS */
	58
	59	#define MUTEX_INIT(m) \
	60	STMT_START { \
	61	*m = mutex_alloc(); \
	62	if (*m) { \
	63	mutex_init(*m); \
	64	} else { \
	65	croak("panic: MUTEX_INIT"); \
	66	} \
	67	} STMT_END
	68
	69	#define MUTEX_LOCK(m) mutex_lock(*m)
	70	#define MUTEX_UNLOCK(m) mutex_unlock(*m)
	71	#define MUTEX_DESTROY(m) \
	72	STMT_START { \
	73	mutex_free(*m); \
	74	*m = 0; \
	75	} STMT_END
	76
	77	#define COND_INIT(c) \
	78	STMT_START { \
	79	*c = condition_alloc(); \
	80	if (*c) { \
	81	condition_init(*c); \
	82	} else { \
	83	croak("panic: COND_INIT"); \
	84	} \
	85	} STMT_END
	86
	87	#define COND_SIGNAL(c) condition_signal(*c)
	88	#define COND_BROADCAST(c) condition_broadcast(*c)
	89	#define COND_WAIT(c, m) condition_wait(c, m)
	90	#define COND_DESTROY(c) \
	91	STMT_START { \
	92	condition_free(*c); \
	93	*c = 0; \
	94	} STMT_END
	95
	96	#define THREAD_CREATE(thr, f) (thr->self = cthread_fork(f, thr), 0)
	97	#define THREAD_POST_CREATE(thr)
	98
	99	#define THREAD_RET_TYPE any_t
	100	#define THREAD_RET_CAST(x) ((any_t) x)
	101
	102	#define DETACH(t) cthread_detach(t->self)
	103	#define JOIN(t, avp) ((avp) = (AV )cthread_join(t->self))
	104
	105	#define SET_THR(thr) cthread_set_data(cthread_self(), thr)
	106	#define THR cthread_data(cthread_self())
	107
	108	#define INIT_THREADS cthread_init()
	109	#define YIELD cthread_yield()
	110	#define ALLOC_THREAD_KEY
	111	#define SET_THREAD_SELF(thr) (thr->self = cthread_self())
	112
	113	#endif /* I_MACH_CTHREADS */
	114
1cfa4ec7	115	#ifndef YIELD
e7a4f449	116	# ifdef SCHED_YIELD
	117	# define YIELD SCHED_YIELD
	118	# else
	119	# ifdef HAS_SCHED_YIELD
	120	# define YIELD sched_yield()
	121	# else
	122	# ifdef HAS_PTHREAD_YIELD
	123	/* pthread_yield(NULL) platforms are expected
	124	* to have #defined YIELD for themselves. */
	125	# define YIELD pthread_yield()
	126	# endif
	127	# endif
	128	# endif
9731c6ca	129	#endif
11343788	130
ea0efc06	131	#ifndef MUTEX_INIT
	132	#define MUTEX_INIT(m) \
	133	STMT_START { \
	134	if (pthread_mutex_init((m), pthread_mutexattr_default)) \
	135	croak("panic: MUTEX_INIT"); \
	136	} STMT_END
	137	#define MUTEX_LOCK(m) \
	138	STMT_START { \
	139	if (pthread_mutex_lock((m))) \
	140	croak("panic: MUTEX_LOCK"); \
	141	} STMT_END
	142	#define MUTEX_UNLOCK(m) \
	143	STMT_START { \
	144	if (pthread_mutex_unlock((m))) \
	145	croak("panic: MUTEX_UNLOCK"); \
	146	} STMT_END
	147	#define MUTEX_DESTROY(m) \
	148	STMT_START { \
	149	if (pthread_mutex_destroy((m))) \
	150	croak("panic: MUTEX_DESTROY"); \
	151	} STMT_END
	152	#endif /* MUTEX_INIT */
	153
	154	#ifndef COND_INIT
	155	#define COND_INIT(c) \
	156	STMT_START { \
	157	if (pthread_cond_init((c), pthread_condattr_default)) \
	158	croak("panic: COND_INIT"); \
	159	} STMT_END
	160	#define COND_SIGNAL(c) \
	161	STMT_START { \
	162	if (pthread_cond_signal((c))) \
	163	croak("panic: COND_SIGNAL"); \
	164	} STMT_END
	165	#define COND_BROADCAST(c) \
	166	STMT_START { \
	167	if (pthread_cond_broadcast((c))) \
	168	croak("panic: COND_BROADCAST"); \
	169	} STMT_END
	170	#define COND_WAIT(c, m) \
	171	STMT_START { \
	172	if (pthread_cond_wait((c), (m))) \
	173	croak("panic: COND_WAIT"); \
	174	} STMT_END
	175	#define COND_DESTROY(c) \
	176	STMT_START { \
	177	if (pthread_cond_destroy((c))) \
	178	croak("panic: COND_DESTROY"); \
	179	} STMT_END
	180	#endif /* COND_INIT */
33f46ff6	181
f826a10b	182	/* DETACH(t) must only be called while holding t->mutex */
ea0efc06	183	#ifndef DETACH
	184	#define DETACH(t) \
	185	STMT_START { \
46930d8f	186	if (pthread_detach((t)->self)) { \
ea0efc06	187	MUTEX_UNLOCK(&(t)->mutex); \
	188	croak("panic: DETACH"); \
	189	} \
	190	} STMT_END
	191	#endif /* DETACH */
33f46ff6	192
ea0efc06	193	#ifndef JOIN
	194	#define JOIN(t, avp) \
	195	STMT_START { \
46930d8f	196	if (pthread_join((t)->self, (void**)(avp))) \
ea0efc06	197	croak("panic: pthread_join"); \
	198	} STMT_END
	199	#endif /* JOIN */
	200
	201	#ifndef SET_THR
	202	#define SET_THR(t) \
	203	STMT_START { \
533c011a	204	if (pthread_setspecific(PL_thr_key, (void *) (t))) \
ea0efc06	205	croak("panic: pthread_setspecific"); \
	206	} STMT_END
	207	#endif /* SET_THR */
	208
	209	#ifndef THR
0d85d877	210	#define THR ((struct perl_thread *) pthread_getspecific(PL_thr_key))
0d85d877	211	#endif
ea0efc06	212
940cb80d	213	/*
	214	* dTHR is performance-critical. Here, we only do the pthread_get_specific
	215	* if there may be more than one thread in existence, otherwise we get thr
	216	* from thrsv which is cached in the per-interpreter structure.
	217	* Systems with very fast pthread_get_specific (which should be all systems
	218	* but unfortunately isn't) may wish to simplify to "...*thr = THR".
	219	*/
ea0efc06	220	#ifndef dTHR
940cb80d	221	# define dTHR \
533c011a	222	struct perl_thread thr = PL_threadnum? THR : (struct perl_thread)SvPVX(PL_thrsv)
ea0efc06	223	#endif /* dTHR */
11343788	224
33f46ff6	225	#ifndef INIT_THREADS
	226	# ifdef NEED_PTHREAD_INIT
	227	# define INIT_THREADS pthread_init()
	228	# else
	229	# define INIT_THREADS NOOP
	230	# endif
	231	#endif
11343788	232
940cb80d	233	/* Accessor for per-thread SVs */
	234	#define THREADSV(i) (thr->threadsvp[i])
	235
	236	/*
	237	* LOCK_SV_MUTEX and UNLOCK_SV_MUTEX are performance-critical. Here, we
	238	* try only locking them if there may be more than one thread in existence.
	239	* Systems with very fast mutexes (and/or slow conditionals) may wish to
	240	* remove the "if (threadnum) ..." test.
	241	*/
5f08fbcd	242	#define LOCK_SV_MUTEX \
	243	STMT_START { \
	244	if (PL_threadnum) \
	245	MUTEX_LOCK(&PL_sv_mutex); \
	246	} STMT_END
	247
	248	#define UNLOCK_SV_MUTEX \
	249	STMT_START { \
533c011a	250	if (PL_threadnum) \
5f08fbcd	251	MUTEX_UNLOCK(&PL_sv_mutex); \
940cb80d	252	} STMT_END
940cb80d	253
5f08fbcd	254	/* Likewise for strtab_mutex */
	255	#define LOCK_STRTAB_MUTEX \
	256	STMT_START { \
	257	if (PL_threadnum) \
	258	MUTEX_LOCK(&PL_strtab_mutex); \
	259	} STMT_END
	260
	261	#define UNLOCK_STRTAB_MUTEX \
	262	STMT_START { \
533c011a	263	if (PL_threadnum) \
5f08fbcd	264	MUTEX_UNLOCK(&PL_strtab_mutex); \
940cb80d	265	} STMT_END
d55594ae	266
ea0efc06	267	#ifndef THREAD_RET_TYPE
	268	# define THREAD_RET_TYPE void *
	269	# define THREAD_RET_CAST(p) ((void *)(p))
	270	#endif /* THREAD_RET */
	271
11343788	272
33f46ff6	273	/* Values and macros for thr->flags */
605e5515	274	#define THRf_STATE_MASK 7
	275	#define THRf_R_JOINABLE 0
	276	#define THRf_R_JOINED 1
	277	#define THRf_R_DETACHED 2
	278	#define THRf_ZOMBIE 3
	279	#define THRf_DEAD 4
f93b4edd	280
458fb581	281	#define THRf_DID_DIE 8
07b73707	282
f826a10b	283	/* ThrSTATE(t) and ThrSETSTATE(t) must only be called while holding t->mutex */
458fb581	284	#define ThrSTATE(t) ((t)->flags & THRf_STATE_MASK)
f93b4edd	285	#define ThrSETSTATE(t, s) STMT_START { \
605e5515	286	(t)->flags &= ~THRf_STATE_MASK; \
33f46ff6	287	(t)->flags \|= (s); \
8b73bbec	288	DEBUG_S(PerlIO_printf(PerlIO_stderr(), \
605e5515	289	"thread %p set to state %d\n", (t), (s))); \
f93b4edd	290	} STMT_END
	291
	292	typedef struct condpair {
f826a10b	293	perl_mutex mutex; /* Protects all other fields */
	294	perl_cond owner_cond; /* For when owner changes at all */
	295	perl_cond cond; /* For cond_signal and cond_broadcast */
	296	Thread owner; /* Currently owning thread */
f93b4edd	297	} condpair_t;
	298
	299	#define MgMUTEXP(mg) (&((condpair_t *)(mg->mg_ptr))->mutex)
	300	#define MgOWNERCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->owner_cond)
	301	#define MgCONDP(mg) (&((condpair_t *)(mg->mg_ptr))->cond)
	302	#define MgOWNER(mg) ((condpair_t *)(mg->mg_ptr))->owner
	303
ea0efc06	304	#else
	305	/* USE_THREADS is not defined */
	306	#define MUTEX_LOCK(m)
	307	#define MUTEX_UNLOCK(m)
	308	#define MUTEX_INIT(m)
	309	#define MUTEX_DESTROY(m)
	310	#define COND_INIT(c)
	311	#define COND_SIGNAL(c)
	312	#define COND_BROADCAST(c)
	313	#define COND_WAIT(c, m)
	314	#define COND_DESTROY(c)
93bce2dc	315	#define LOCK_SV_MUTEX
93bce2dc	316	#define UNLOCK_SV_MUTEX
5f08fbcd	317	#define LOCK_STRTAB_MUTEX
5f08fbcd	318	#define UNLOCK_STRTAB_MUTEX
ea0efc06	319
	320	#define THR
	321	/* Rats: if dTHR is just blank then the subsequent ";" throws an error */
76e3520e	322	#ifdef WIN32
e3b8966e	323	#define dTHR extern int Perl___notused
76e3520e	324	#else
ea0efc06	325	#define dTHR extern int errno
76e3520e	326	#endif
11343788	327	#endif /* USE_THREADS */