[p5sagit/p5-mst-13.2.git] / ext / threads / threads.xs

#define PERL_NO_GET_CONTEXT
#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#ifdef USE_ITHREADS

#ifdef WIN32
#include <windows.h>
#include <win32thread.h>
#define PERL_THREAD_SETSPECIFIC(k,v) TlsSetValue(k,v)
#define PERL_THREAD_GETSPECIFIC(k,v) v = TlsGetValue(k)
#define PERL_THREAD_ALLOC_SPECIFIC(k) \
STMT_START {\
  if((k = TlsAlloc()) == TLS_OUT_OF_INDEXES) {\
    PerlIO_printf(PerlIO_stderr(),"panic threads.h: TlsAlloc");\
    exit(1);\
  }\
} STMT_END
#else
#include <pthread.h>
#include <thread.h>

#define PERL_THREAD_SETSPECIFIC(k,v) pthread_setspecific(k,v)
#ifdef OLD_PTHREADS_API
#define PERL_THREAD_DETACH(t) pthread_detach(&(t))
#define PERL_THREAD_GETSPECIFIC(k,v) pthread_getspecific(k,&v)
#define PERL_THREAD_ALLOC_SPECIFIC(k) STMT_START {\
  if(pthread_keycreate(&(k),0)) {\
    PerlIO_printf(PerlIO_stderr(), "panic threads.h: pthread_key_create");\
    exit(1);\
  }\
} STMT_END
#else
#define PERL_THREAD_DETACH(t) pthread_detach((t))
#define PERL_THREAD_GETSPECIFIC(k,v) v = pthread_getspecific(k)
#define PERL_THREAD_ALLOC_SPECIFIC(k) STMT_START {\
  if(pthread_key_create(&(k),0)) {\
    PerlIO_printf(PerlIO_stderr(), "panic threads.h: pthread_key_create");\
    exit(1);\
  }\
} STMT_END
#endif
#endif

/* Values for 'state' member */
#define PERL_ITHR_JOINABLE		0
#define PERL_ITHR_DETACHED		1
#define PERL_ITHR_FINISHED		4
#define PERL_ITHR_JOINED		2

typedef struct ithread_s {
    struct ithread_s *next;	/* next thread in the list */
    struct ithread_s *prev;	/* prev thread in the list */
    PerlInterpreter *interp;	/* The threads interpreter */
    I32 tid;              	/* threads module's thread id */
    perl_mutex mutex; 		/* mutex for updating things in this struct */
    I32 count;			/* how many SVs have a reference to us */
    signed char state;		/* are we detached ? */
    int gimme;			/* Context of create */
    SV* init_function;          /* Code to run */
    SV* params;                 /* args to pass function */
#ifdef WIN32
	DWORD	thr;            /* OS's idea if thread id */
	HANDLE handle;          /* OS's waitable handle */
#else
  	pthread_t thr;          /* OS's handle for the thread */
#endif
} ithread;

ithread *threads;

/* Macros to supply the aTHX_ in an embed.h like manner */
#define ithread_join(thread)		Perl_ithread_join(aTHX_ thread)
#define ithread_DESTROY(thread)		Perl_ithread_DESTROY(aTHX_ thread)
#define ithread_CLONE(thread)		Perl_ithread_CLONE(aTHX_ thread)
#define ithread_detach(thread)		Perl_ithread_detach(aTHX_ thread)
#define ithread_tid(thread)		((thread)->tid)
#define ithread_yield(thread)		(YIELD);

static perl_mutex create_destruct_mutex;  /* protects the creation and destruction of threads*/

I32 tid_counter = 0;
I32 known_threads = 0;
I32 active_threads = 0;
perl_key self_key;

/*
 *  Clear up after thread is done with
 */
void
Perl_ithread_destruct (pTHX_ ithread* thread, const char *why)
{
	MUTEX_LOCK(&thread->mutex);
	if (!thread->next) {
	    Perl_croak(aTHX_ "panic: destruct destroyed thread %p (%s)",thread, why);
	}
	if (thread->count != 0) {
		MUTEX_UNLOCK(&thread->mutex);
		return;
	}
	MUTEX_LOCK(&create_destruct_mutex);
	/* Remove from circular list of threads */
	if (thread->next == thread) {
	    /* last one should never get here ? */
	    threads = NULL;
        }
	else {
	    thread->next->prev = thread->prev;
	    thread->prev->next = thread->next;
	    if (threads == thread) {
		threads = thread->next;
	    }
	    thread->next = NULL;
	    thread->prev = NULL;
	}
	known_threads--;
	assert( known_threads >= 0 );
#if 0
        Perl_warn(aTHX_ "destruct %d @ %p by %p now %d",
	          thread->tid,thread->interp,aTHX, known_threads);
#endif
	MUTEX_UNLOCK(&create_destruct_mutex);
	/* Thread is now disowned */
	if (thread->interp) {
	    dTHXa(thread->interp);
	    PERL_SET_CONTEXT(thread->interp);
	    SvREFCNT_dec(thread->params);
	    thread->params = Nullsv;
	    perl_destruct(thread->interp);
	    perl_free(thread->interp);
	    thread->interp = NULL;
	}
	PERL_SET_CONTEXT(aTHX);
	MUTEX_UNLOCK(&thread->mutex);
	MUTEX_DESTROY(&thread->mutex);
        PerlMemShared_free(thread);
}

int
Perl_ithread_hook(pTHX)
{
    int veto_cleanup = 0;
    MUTEX_LOCK(&create_destruct_mutex);
    if (aTHX == PL_curinterp && active_threads != 1) {
	Perl_warn(aTHX_ "Cleanup skipped %d active threads", active_threads);
	veto_cleanup = 1;
    }
    MUTEX_UNLOCK(&create_destruct_mutex);
    return veto_cleanup;
}

void
Perl_ithread_detach(pTHX_ ithread *thread)
{
    MUTEX_LOCK(&thread->mutex);
    if (!(thread->state & (PERL_ITHR_DETACHED|PERL_ITHR_JOINED))) {
	thread->state |= PERL_ITHR_DETACHED;
#ifdef WIN32
	CloseHandle(thread->handle);
	thread->handle = 0;
#else
	PERL_THREAD_DETACH(thread->thr);
#endif
    }
    if ((thread->state & PERL_ITHR_FINISHED) &&
        (thread->state & PERL_ITHR_DETACHED)) {
	MUTEX_UNLOCK(&thread->mutex);
	Perl_ithread_destruct(aTHX_ thread, "detach");
    }
    else {
	MUTEX_UNLOCK(&thread->mutex);
    }
}

/* MAGIC (in mg.h sense) hooks */

int
ithread_mg_get(pTHX_ SV *sv, MAGIC *mg)
{
    ithread *thread = (ithread *) mg->mg_ptr;
    SvIVX(sv) = PTR2IV(thread);
    SvIOK_on(sv);
    return 0;
}

int
ithread_mg_free(pTHX_ SV *sv, MAGIC *mg)
{
    ithread *thread = (ithread *) mg->mg_ptr;
    MUTEX_LOCK(&thread->mutex);
    thread->count--;
    if (thread->count == 0) {
       if(thread->state & PERL_ITHR_FINISHED &&
          (thread->state & PERL_ITHR_DETACHED ||
           thread->state & PERL_ITHR_JOINED))
       {
            MUTEX_UNLOCK(&thread->mutex);
            Perl_ithread_destruct(aTHX_ thread, "no reference");
       }
       MUTEX_UNLOCK(&thread->mutex);
    }
    else {
	MUTEX_UNLOCK(&thread->mutex);
    }
    return 0;
}

int
ithread_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
{
    ithread *thread = (ithread *) mg->mg_ptr;
    MUTEX_LOCK(&thread->mutex);
    thread->count++;
    MUTEX_UNLOCK(&thread->mutex);
    return 0;
}

MGVTBL ithread_vtbl = {
 ithread_mg_get,	/* get */
 0,			/* set */
 0,			/* len */
 0,			/* clear */
 ithread_mg_free,	/* free */
 0,			/* copy */
 ithread_mg_dup		/* dup */
};


/*
 *	Starts executing the thread. Needs to clean up memory a tad better.
 *      Passed as the C level function to run in the new thread
 */

#ifdef WIN32
THREAD_RET_TYPE
Perl_ithread_run(LPVOID arg) {
#else
void*
Perl_ithread_run(void * arg) {
#endif
	ithread* thread = (ithread*) arg;
	dTHXa(thread->interp);
	PERL_SET_CONTEXT(thread->interp);
	PERL_THREAD_SETSPECIFIC(self_key,thread);

#if 0
	/* Far from clear messing with ->thr child-side is a good idea */
	MUTEX_LOCK(&thread->mutex);
#ifdef WIN32
	thread->thr = GetCurrentThreadId();
#else
	thread->thr = pthread_self();
#endif
 	MUTEX_UNLOCK(&thread->mutex);
#endif

	PL_perl_destruct_level = 2;

	{
		AV* params = (AV*) SvRV(thread->params);
		I32 len = av_len(params)+1;
		int i;
		dSP;
		ENTER;
		SAVETMPS;
		PUSHMARK(SP);
		for(i = 0; i < len; i++) {
		    XPUSHs(av_shift(params));
		}
		PUTBACK;
		len = call_sv(thread->init_function, thread->gimme|G_EVAL);
		SPAGAIN;
		for (i=len-1; i >= 0; i--) {
		  SV *sv = POPs;
		  av_store(params, i, SvREFCNT_inc(sv));
		}
		PUTBACK;
		if (SvTRUE(ERRSV)) {
		    Perl_warn(aTHX_ "Died:%_",ERRSV);
		}
		FREETMPS;
		LEAVE;
		SvREFCNT_dec(thread->init_function);
	}

	PerlIO_flush((PerlIO*)NULL);
	MUTEX_LOCK(&create_destruct_mutex);
	active_threads--;
	assert( active_threads >= 0 );
	MUTEX_UNLOCK(&create_destruct_mutex);
	MUTEX_LOCK(&thread->mutex);
	thread->state |= PERL_ITHR_FINISHED;

	if (thread->state & PERL_ITHR_DETACHED) {
		MUTEX_UNLOCK(&thread->mutex);
		Perl_ithread_destruct(aTHX_ thread, "detached finish");
	} else {
		MUTEX_UNLOCK(&thread->mutex);
	}
#ifdef WIN32
	return (DWORD)0;
#else
	return 0;
#endif
}

SV *
ithread_to_SV(pTHX_ SV *obj, ithread *thread, char *classname, bool inc)
{
    SV *sv;
    MAGIC *mg;
    if (inc) {
	MUTEX_LOCK(&thread->mutex);
	thread->count++;
	MUTEX_UNLOCK(&thread->mutex);
    }
    if (!obj)
     obj = newSV(0);
    sv = newSVrv(obj,classname);
    sv_setiv(sv,PTR2IV(thread));
    mg = sv_magicext(sv,Nullsv,PERL_MAGIC_shared_scalar,&ithread_vtbl,(char *)thread,0);
    mg->mg_flags |= MGf_DUP;
    SvREADONLY_on(sv);
    return obj;
}

ithread *
SV_to_ithread(pTHX_ SV *sv)
{
    ithread *thread;
    if (SvROK(sv))
     {
      thread = INT2PTR(ithread*, SvIV(SvRV(sv)));
     }
    else
     {
      PERL_THREAD_GETSPECIFIC(self_key,thread);
     }
    return thread;
}

/*
 * iThread->create(); ( aka iThread->new() )
 * Called in context of parent thread
 */

SV *
Perl_ithread_create(pTHX_ SV *obj, char* classname, SV* init_function, SV* params)
{
	ithread*	thread;
	CLONE_PARAMS	clone_param;

	MUTEX_LOCK(&create_destruct_mutex);
	thread = PerlMemShared_malloc(sizeof(ithread));
	Zero(thread,1,ithread);
	thread->next = threads;
	thread->prev = threads->prev;
	threads->prev = thread;
	thread->prev->next = thread;
	/* Set count to 1 immediately in case thread exits before
	 * we return to caller !
	 */
	thread->count = 1;
	MUTEX_INIT(&thread->mutex);
	thread->tid = tid_counter++;
	thread->gimme = GIMME_V;
	thread->state = (thread->gimme == G_VOID) ? 1 : 0;

	/* "Clone" our interpreter into the thread's interpreter
	 * This gives thread access to "static data" and code.
	 */

	PerlIO_flush((PerlIO*)NULL);

#ifdef WIN32
	thread->interp = perl_clone(aTHX, CLONEf_KEEP_PTR_TABLE | CLONEf_CLONE_HOST);
#else
	thread->interp = perl_clone(aTHX, CLONEf_KEEP_PTR_TABLE);
#endif
	/* perl_clone leaves us in new interpreter's context.
	   As it is tricky to spot implcit aTHX create a new scope
	   with aTHX matching the context for the duration of
	   our work for new interpreter.
	 */
	{
	    dTHXa(thread->interp);
            /* Here we remove END blocks since they should only run
	       in the thread they are created
            */
            SvREFCNT_dec(PL_endav);
            PL_endav = newAV();
            clone_param.flags = 0;
	    thread->init_function = sv_dup(init_function, &clone_param);
	    if (SvREFCNT(thread->init_function) == 0) {
		SvREFCNT_inc(thread->init_function);
	    }

	    thread->params = sv_dup(params, &clone_param);
	    SvREFCNT_inc(thread->params);
	    SvTEMP_off(thread->init_function);
	    ptr_table_free(PL_ptr_table);
	    PL_ptr_table = NULL;
	}

	PERL_SET_CONTEXT(aTHX);

	/* Start the thread */

#ifdef WIN32

	thread->handle = CreateThread(NULL, 0, Perl_ithread_run,
			(LPVOID)thread, 0, &thread->thr);

#else
	{
	  static pthread_attr_t attr;
	  static int attr_inited = 0;
	  static int attr_joinable = PTHREAD_CREATE_JOINABLE;
	  if (!attr_inited) {
	    attr_inited = 1;
	    pthread_attr_init(&attr);
	  }
#  ifdef PTHREAD_ATTR_SETDETACHSTATE
            PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
#  endif
#  ifdef THREAD_CREATE_NEEDS_STACK
	    if(pthread_attr_setstacksize(&attr, THREAD_CREATE_NEEDS_STACK))
	      croak("panic: pthread_attr_setstacksize failed");
#  endif

#ifdef OLD_PTHREADS_API
	  pthread_create( &thread->thr, attr, Perl_ithread_run, (void *)thread);
#else
	  pthread_create( &thread->thr, &attr, Perl_ithread_run, (void *)thread);
#endif
	}
#endif
	known_threads++;
	active_threads++;
	MUTEX_UNLOCK(&create_destruct_mutex);
	sv_2mortal(params);
	return ithread_to_SV(aTHX_ obj, thread, classname, FALSE);
}

SV*
Perl_ithread_self (pTHX_ SV *obj, char* Class)
{
    ithread *thread;
    PERL_THREAD_GETSPECIFIC(self_key,thread);
    return ithread_to_SV(aTHX_ obj, thread, Class, TRUE);
}

/*
 * Joins the thread this code needs to take the returnvalue from the
 * call_sv and send it back
 */

void
Perl_ithread_CLONE(pTHX_ SV *obj)
{
 if (SvROK(obj))
  {
   ithread *thread = SV_to_ithread(aTHX_ obj);
  }
 else
  {
   Perl_warn(aTHX_ "CLONE %_",obj);
  }
}

AV*
Perl_ithread_join(pTHX_ SV *obj)
{
    ithread *thread = SV_to_ithread(aTHX_ obj);
    MUTEX_LOCK(&thread->mutex);
    if (thread->state & PERL_ITHR_DETACHED) {
	MUTEX_UNLOCK(&thread->mutex);
	Perl_croak(aTHX_ "Cannot join a detached thread");
    }
    else if (thread->state & PERL_ITHR_JOINED) {
	MUTEX_UNLOCK(&thread->mutex);
	Perl_croak(aTHX_ "Thread already joined");
    }
    else {
        AV* retparam;
#ifdef WIN32
	DWORD waitcode;
#else
	void *retval;
#endif
	MUTEX_UNLOCK(&thread->mutex);
#ifdef WIN32
	waitcode = WaitForSingleObject(thread->handle, INFINITE);
#else
	pthread_join(thread->thr,&retval);
#endif
	MUTEX_LOCK(&thread->mutex);
	
	/* sv_dup over the args */
	{
	  AV* params = (AV*) SvRV(thread->params);	
	  CLONE_PARAMS clone_params;
	  clone_params.stashes = newAV();
	  PL_ptr_table = ptr_table_new();
	  retparam = (AV*) sv_dup((SV*)params, &clone_params);
	  SvREFCNT_dec(clone_params.stashes);
	  SvREFCNT_inc(retparam);
	  ptr_table_free(PL_ptr_table);
	  PL_ptr_table = NULL;

	}
	/* We have finished with it */
	thread->state |= PERL_ITHR_JOINED;
	MUTEX_UNLOCK(&thread->mutex);
	return retparam;
    }
    return (AV*)NULL;
}

void
Perl_ithread_DESTROY(pTHX_ SV *sv)
{
    ithread *thread = SV_to_ithread(aTHX_ sv);
    sv_unmagic(SvRV(sv),PERL_MAGIC_shared_scalar);
}

#endif /* USE_ITHREADS */

MODULE = threads		PACKAGE = threads	PREFIX = ithread_
PROTOTYPES: DISABLE

#ifdef USE_ITHREADS

void
ithread_new (classname, function_to_call, ...)
char *	classname
SV *	function_to_call
CODE:
{
    AV* params = newAV();
    if (items > 2) {
	int i;
	for(i = 2; i < items ; i++) {
	    av_push(params, SvREFCNT_inc(ST(i)));
	}
    }
    ST(0) = sv_2mortal(Perl_ithread_create(aTHX_ Nullsv, classname, function_to_call, newRV_noinc((SV*) params)));
    XSRETURN(1);
}

void
ithread_self(char *classname)
CODE:
{
	ST(0) = sv_2mortal(Perl_ithread_self(aTHX_ Nullsv,classname));
	XSRETURN(1);
}

int
ithread_tid(ithread *thread)

void
ithread_join(SV *obj)
PPCODE:
{
  AV* params = Perl_ithread_join(aTHX_ obj);
  int i;
  I32 len = AvFILL(params);
  for (i = 0; i <= len; i++) {
    SV* tmp = av_shift(params);
    XPUSHs(tmp);
    sv_2mortal(tmp);
  }
  SvREFCNT_dec(params);
}

void
ithread_yield(ithread *thread)

void
ithread_detach(ithread *thread)

void
ithread_DESTROY(SV *thread)

#endif /* USE_ITHREADS */

BOOT:
{
#ifdef USE_ITHREADS
	ithread* thread;
	PL_perl_destruct_level = 2;
	PERL_THREAD_ALLOC_SPECIFIC(self_key);
	MUTEX_INIT(&create_destruct_mutex);
	MUTEX_LOCK(&create_destruct_mutex);
	PL_threadhook = &Perl_ithread_hook;
	thread  = PerlMemShared_malloc(sizeof(ithread));
	Zero(thread,1,ithread);
	PL_perl_destruct_level = 2;
	MUTEX_INIT(&thread->mutex);
	threads = thread;
	thread->next = thread;
        thread->prev = thread;
	thread->interp = aTHX;
	thread->count  = 1;  /* imortal */
	thread->tid = tid_counter++;
	known_threads++;
	active_threads++;
	thread->state = 1;
#ifdef WIN32
	thread->thr = GetCurrentThreadId();
#else
	thread->thr = pthread_self();
#endif

	PERL_THREAD_SETSPECIFIC(self_key,thread);
	MUTEX_UNLOCK(&create_destruct_mutex);
#endif /* USE_ITHREADS */
}
Commit	Line	Data
68795e93	1	#define PERL_NO_GET_CONTEXT
	2	#include "EXTERN.h"
	3	#include "perl.h"
	4	#include "XSUB.h"
	5
73e09c8f	6	#ifdef USE_ITHREADS
73e09c8f	7
68795e93	8	#ifdef WIN32
	9	#include <windows.h>
	10	#include <win32thread.h>
	11	#define PERL_THREAD_SETSPECIFIC(k,v) TlsSetValue(k,v)
	12	#define PERL_THREAD_GETSPECIFIC(k,v) v = TlsGetValue(k)
	13	#define PERL_THREAD_ALLOC_SPECIFIC(k) \
	14	STMT_START {\
	15	if((k = TlsAlloc()) == TLS_OUT_OF_INDEXES) {\
	16	PerlIO_printf(PerlIO_stderr(),"panic threads.h: TlsAlloc");\
	17	exit(1);\
	18	}\
	19	} STMT_END
	20	#else
	21	#include <pthread.h>
	22	#include <thread.h>
	23
	24	#define PERL_THREAD_SETSPECIFIC(k,v) pthread_setspecific(k,v)
	25	#ifdef OLD_PTHREADS_API
	26	#define PERL_THREAD_DETACH(t) pthread_detach(&(t))
	27	#define PERL_THREAD_GETSPECIFIC(k,v) pthread_getspecific(k,&v)
	28	#define PERL_THREAD_ALLOC_SPECIFIC(k) STMT_START {\
	29	if(pthread_keycreate(&(k),0)) {\
	30	PerlIO_printf(PerlIO_stderr(), "panic threads.h: pthread_key_create");\
	31	exit(1);\
	32	}\
	33	} STMT_END
	34	#else
	35	#define PERL_THREAD_DETACH(t) pthread_detach((t))
	36	#define PERL_THREAD_GETSPECIFIC(k,v) v = pthread_getspecific(k)
	37	#define PERL_THREAD_ALLOC_SPECIFIC(k) STMT_START {\
	38	if(pthread_key_create(&(k),0)) {\
	39	PerlIO_printf(PerlIO_stderr(), "panic threads.h: pthread_key_create");\
	40	exit(1);\
	41	}\
	42	} STMT_END
	43	#endif
	44	#endif
	45
62375a60	46	/* Values for 'state' member */
	47	#define PERL_ITHR_JOINABLE 0
	48	#define PERL_ITHR_DETACHED 1
	49	#define PERL_ITHR_FINISHED 4
	50	#define PERL_ITHR_JOINED 2
	51
68795e93	52	typedef struct ithread_s {
	53	struct ithread_s next; / next thread in the list */
	54	struct ithread_s prev; / prev thread in the list */
	55	PerlInterpreter interp; / The threads interpreter */
	56	I32 tid; /* threads module's thread id */
	57	perl_mutex mutex; /* mutex for updating things in this struct */
	58	I32 count; /* how many SVs have a reference to us */
62375a60	59	signed char state; /* are we detached ? */
a446a88f	60	int gimme; /* Context of create */
68795e93	61	SV* init_function; /* Code to run */
	62	SV* params; /* args to pass function */
	63	#ifdef WIN32
	64	DWORD thr; /* OS's idea if thread id */
	65	HANDLE handle; /* OS's waitable handle */
	66	#else
	67	pthread_t thr; /* OS's handle for the thread */
	68	#endif
	69	} ithread;
	70
	71	ithread *threads;
	72
	73	/* Macros to supply the aTHX_ in an embed.h like manner */
	74	#define ithread_join(thread) Perl_ithread_join(aTHX_ thread)
	75	#define ithread_DESTROY(thread) Perl_ithread_DESTROY(aTHX_ thread)
	76	#define ithread_CLONE(thread) Perl_ithread_CLONE(aTHX_ thread)
	77	#define ithread_detach(thread) Perl_ithread_detach(aTHX_ thread)
	78	#define ithread_tid(thread) ((thread)->tid)
f9dff5f5	79	#define ithread_yield(thread) (YIELD);
68795e93	80
58c2ef19	81	static perl_mutex create_destruct_mutex; /* protects the creation and destruction of threads*/
68795e93	82
68795e93	83	I32 tid_counter = 0;
62375a60	84	I32 known_threads = 0;
58c2ef19	85	I32 active_threads = 0;
68795e93	86	perl_key self_key;
	87
	88	/*
	89	* Clear up after thread is done with
	90	*/
	91	void
62375a60	92	Perl_ithread_destruct (pTHX_ ithread* thread, const char *why)
68795e93	93	{
68795e93	94	MUTEX_LOCK(&thread->mutex);
62375a60	95	if (!thread->next) {
	96	Perl_croak(aTHX_ "panic: destruct destroyed thread %p (%s)",thread, why);
	97	}
68795e93	98	if (thread->count != 0) {
68795e93	99	MUTEX_UNLOCK(&thread->mutex);
d1400e48	100	return;
68795e93	101	}
58c2ef19	102	MUTEX_LOCK(&create_destruct_mutex);
68795e93	103	/* Remove from circular list of threads */
	104	if (thread->next == thread) {
	105	/* last one should never get here ? */
	106	threads = NULL;
	107	}
	108	else {
f42ad631	109	thread->next->prev = thread->prev;
f42ad631	110	thread->prev->next = thread->next;
68795e93	111	if (threads == thread) {
	112	threads = thread->next;
	113	}
62375a60	114	thread->next = NULL;
62375a60	115	thread->prev = NULL;
68795e93	116	}
62375a60	117	known_threads--;
62375a60	118	assert( known_threads >= 0 );
ba14dd9a	119	#if 0
62375a60	120	Perl_warn(aTHX_ "destruct %d @ %p by %p now %d",
62375a60	121	thread->tid,thread->interp,aTHX, known_threads);
ba14dd9a	122	#endif
62375a60	123	MUTEX_UNLOCK(&create_destruct_mutex);
62375a60	124	/* Thread is now disowned */
68795e93	125	if (thread->interp) {
1c3adb19	126	dTHXa(thread->interp);
68795e93	127	PERL_SET_CONTEXT(thread->interp);
1c3adb19	128	SvREFCNT_dec(thread->params);
1c3adb19	129	thread->params = Nullsv;
68795e93	130	perl_destruct(thread->interp);
	131	perl_free(thread->interp);
	132	thread->interp = NULL;
	133	}
	134	PERL_SET_CONTEXT(aTHX);
d1400e48	135	MUTEX_UNLOCK(&thread->mutex);
1c3adb19	136	MUTEX_DESTROY(&thread->mutex);
1c3adb19	137	PerlMemShared_free(thread);
68795e93	138	}
68795e93	139
62375a60	140	int
	141	Perl_ithread_hook(pTHX)
	142	{
	143	int veto_cleanup = 0;
	144	MUTEX_LOCK(&create_destruct_mutex);
	145	if (aTHX == PL_curinterp && active_threads != 1) {
	146	Perl_warn(aTHX_ "Cleanup skipped %d active threads", active_threads);
	147	veto_cleanup = 1;
	148	}
	149	MUTEX_UNLOCK(&create_destruct_mutex);
	150	return veto_cleanup;
	151	}
	152
	153	void
	154	Perl_ithread_detach(pTHX_ ithread *thread)
	155	{
	156	MUTEX_LOCK(&thread->mutex);
	157	if (!(thread->state & (PERL_ITHR_DETACHED\|PERL_ITHR_JOINED))) {
	158	thread->state \|= PERL_ITHR_DETACHED;
	159	#ifdef WIN32
	160	CloseHandle(thread->handle);
	161	thread->handle = 0;
	162	#else
	163	PERL_THREAD_DETACH(thread->thr);
	164	#endif
	165	}
	166	if ((thread->state & PERL_ITHR_FINISHED) &&
	167	(thread->state & PERL_ITHR_DETACHED)) {
	168	MUTEX_UNLOCK(&thread->mutex);
	169	Perl_ithread_destruct(aTHX_ thread, "detach");
	170	}
	171	else {
	172	MUTEX_UNLOCK(&thread->mutex);
	173	}
	174	}
68795e93	175
	176	/* MAGIC (in mg.h sense) hooks */
	177
	178	int
	179	ithread_mg_get(pTHX_ SV sv, MAGIC mg)
	180	{
	181	ithread thread = (ithread ) mg->mg_ptr;
	182	SvIVX(sv) = PTR2IV(thread);
	183	SvIOK_on(sv);
	184	return 0;
	185	}
	186
	187	int
	188	ithread_mg_free(pTHX_ SV sv, MAGIC mg)
	189	{
	190	ithread thread = (ithread ) mg->mg_ptr;
	191	MUTEX_LOCK(&thread->mutex);
68795e93	192	thread->count--;
62375a60	193	if (thread->count == 0) {
1c3adb19	194	if(thread->state & PERL_ITHR_FINISHED &&
	195	(thread->state & PERL_ITHR_DETACHED \|\|
	196	thread->state & PERL_ITHR_JOINED))
	197	{
	198	MUTEX_UNLOCK(&thread->mutex);
	199	Perl_ithread_destruct(aTHX_ thread, "no reference");
	200	}
	201	MUTEX_UNLOCK(&thread->mutex);
62375a60	202	}
	203	else {
	204	MUTEX_UNLOCK(&thread->mutex);
	205	}
68795e93	206	return 0;
	207	}
	208
	209	int
	210	ithread_mg_dup(pTHX_ MAGIC mg, CLONE_PARAMS param)
	211	{
	212	ithread thread = (ithread ) mg->mg_ptr;
	213	MUTEX_LOCK(&thread->mutex);
68795e93	214	thread->count++;
	215	MUTEX_UNLOCK(&thread->mutex);
	216	return 0;
	217	}
	218
	219	MGVTBL ithread_vtbl = {
	220	ithread_mg_get, /* get */
	221	0, /* set */
	222	0, /* len */
	223	0, /* clear */
	224	ithread_mg_free, /* free */
	225	0, /* copy */
	226	ithread_mg_dup /* dup */
	227	};
	228
47ba8780	229
47ba8780	230	/*
b1edfb69	231	* Starts executing the thread. Needs to clean up memory a tad better.
68795e93	232	* Passed as the C level function to run in the new thread
b1edfb69	233	*/
47ba8780	234
47ba8780	235	#ifdef WIN32
68795e93	236	THREAD_RET_TYPE
68795e93	237	Perl_ithread_run(LPVOID arg) {
47ba8780	238	#else
68795e93	239	void*
68795e93	240	Perl_ithread_run(void * arg) {
47ba8780	241	#endif
5b414d21	242	ithread* thread = (ithread*) arg;
47ba8780	243	dTHXa(thread->interp);
47ba8780	244	PERL_SET_CONTEXT(thread->interp);
68795e93	245	PERL_THREAD_SETSPECIFIC(self_key,thread);
47ba8780	246
68795e93	247	#if 0
	248	/* Far from clear messing with ->thr child-side is a good idea */
	249	MUTEX_LOCK(&thread->mutex);
47ba8780	250	#ifdef WIN32
	251	thread->thr = GetCurrentThreadId();
	252	#else
	253	thread->thr = pthread_self();
	254	#endif
68795e93	255	MUTEX_UNLOCK(&thread->mutex);
68795e93	256	#endif
47ba8780	257
47ba8780	258	PL_perl_destruct_level = 2;
4f896ddc	259
47ba8780	260	{
68795e93	261	AV* params = (AV*) SvRV(thread->params);
68795e93	262	I32 len = av_len(params)+1;
47ba8780	263	int i;
47ba8780	264	dSP;
47ba8780	265	ENTER;
	266	SAVETMPS;
	267	PUSHMARK(SP);
68795e93	268	for(i = 0; i < len; i++) {
68795e93	269	XPUSHs(av_shift(params));
47ba8780	270	}
47ba8780	271	PUTBACK;
a446a88f	272	len = call_sv(thread->init_function, thread->gimme\|G_EVAL);
68795e93	273	SPAGAIN;
a446a88f	274	for (i=len-1; i >= 0; i--) {
e1c44605	275	SV *sv = POPs;
e1c44605	276	av_store(params, i, SvREFCNT_inc(sv));
a446a88f	277	}
	278	PUTBACK;
	279	if (SvTRUE(ERRSV)) {
	280	Perl_warn(aTHX_ "Died:%_",ERRSV);
	281	}
47ba8780	282	FREETMPS;
47ba8780	283	LEAVE;
68795e93	284	SvREFCNT_dec(thread->init_function);
47ba8780	285	}
47ba8780	286
fd58862f	287	PerlIO_flush((PerlIO*)NULL);
62375a60	288	MUTEX_LOCK(&create_destruct_mutex);
	289	active_threads--;
	290	assert( active_threads >= 0 );
	291	MUTEX_UNLOCK(&create_destruct_mutex);
68795e93	292	MUTEX_LOCK(&thread->mutex);
62375a60	293	thread->state \|= PERL_ITHR_FINISHED;
	294
	295	if (thread->state & PERL_ITHR_DETACHED) {
47ba8780	296	MUTEX_UNLOCK(&thread->mutex);
62375a60	297	Perl_ithread_destruct(aTHX_ thread, "detached finish");
47ba8780	298	} else {
62375a60	299	MUTEX_UNLOCK(&thread->mutex);
62375a60	300	}
47ba8780	301	#ifdef WIN32
47ba8780	302	return (DWORD)0;
e8f2bb9a	303	#else
e8f2bb9a	304	return 0;
47ba8780	305	#endif
68795e93	306	}
	307
	308	SV *
	309	ithread_to_SV(pTHX_ SV obj, ithread thread, char *classname, bool inc)
	310	{
	311	SV *sv;
	312	MAGIC *mg;
	313	if (inc) {
	314	MUTEX_LOCK(&thread->mutex);
	315	thread->count++;
68795e93	316	MUTEX_UNLOCK(&thread->mutex);
	317	}
	318	if (!obj)
	319	obj = newSV(0);
	320	sv = newSVrv(obj,classname);
	321	sv_setiv(sv,PTR2IV(thread));
	322	mg = sv_magicext(sv,Nullsv,PERL_MAGIC_shared_scalar,&ithread_vtbl,(char *)thread,0);
	323	mg->mg_flags \|= MGf_DUP;
	324	SvREADONLY_on(sv);
	325	return obj;
	326	}
47ba8780	327
68795e93	328	ithread *
	329	SV_to_ithread(pTHX_ SV *sv)
	330	{
	331	ithread *thread;
	332	if (SvROK(sv))
	333	{
	334	thread = INT2PTR(ithread*, SvIV(SvRV(sv)));
	335	}
	336	else
	337	{
	338	PERL_THREAD_GETSPECIFIC(self_key,thread);
	339	}
	340	return thread;
47ba8780	341	}
47ba8780	342
47ba8780	343	/*
68795e93	344	* iThread->create(); ( aka iThread->new() )
68795e93	345	* Called in context of parent thread
b1edfb69	346	*/
47ba8780	347
68795e93	348	SV *
	349	Perl_ithread_create(pTHX_ SV obj, char classname, SV* init_function, SV* params)
	350	{
	351	ithread* thread;
	352	CLONE_PARAMS clone_param;
	353
58c2ef19	354	MUTEX_LOCK(&create_destruct_mutex);
68795e93	355	thread = PerlMemShared_malloc(sizeof(ithread));
	356	Zero(thread,1,ithread);
	357	thread->next = threads;
	358	thread->prev = threads->prev;
f42ad631	359	threads->prev = thread;
68795e93	360	thread->prev->next = thread;
	361	/* Set count to 1 immediately in case thread exits before
	362	* we return to caller !
	363	*/
	364	thread->count = 1;
	365	MUTEX_INIT(&thread->mutex);
	366	thread->tid = tid_counter++;
a446a88f	367	thread->gimme = GIMME_V;
62375a60	368	thread->state = (thread->gimme == G_VOID) ? 1 : 0;
4f896ddc	369
68795e93	370	/* "Clone" our interpreter into the thread's interpreter
	371	* This gives thread access to "static data" and code.
	372	*/
47ba8780	373
68795e93	374	PerlIO_flush((PerlIO*)NULL);
cd8c9bf8	375
47ba8780	376	#ifdef WIN32
68795e93	377	thread->interp = perl_clone(aTHX, CLONEf_KEEP_PTR_TABLE \| CLONEf_CLONE_HOST);
47ba8780	378	#else
68795e93	379	thread->interp = perl_clone(aTHX, CLONEf_KEEP_PTR_TABLE);
47ba8780	380	#endif
ba14dd9a	381	/* perl_clone leaves us in new interpreter's context.
ba14dd9a	382	As it is tricky to spot implcit aTHX create a new scope
a446a88f	383	with aTHX matching the context for the duration of
ba14dd9a	384	our work for new interpreter.
	385	*/
	386	{
	387	dTHXa(thread->interp);
58c2ef19	388	/* Here we remove END blocks since they should only run
62375a60	389	in the thread they are created
58c2ef19	390	*/
	391	SvREFCNT_dec(PL_endav);
	392	PL_endav = newAV();
d1400e48	393	clone_param.flags = 0;
ba14dd9a	394	thread->init_function = sv_dup(init_function, &clone_param);
	395	if (SvREFCNT(thread->init_function) == 0) {
	396	SvREFCNT_inc(thread->init_function);
d1400e48	397	}
ba14dd9a	398
	399	thread->params = sv_dup(params, &clone_param);
	400	SvREFCNT_inc(thread->params);
	401	SvTEMP_off(thread->init_function);
	402	ptr_table_free(PL_ptr_table);
	403	PL_ptr_table = NULL;
	404	}
d1400e48	405
68795e93	406	PERL_SET_CONTEXT(aTHX);
47ba8780	407
68795e93	408	/* Start the thread */
47ba8780	409
	410	#ifdef WIN32
	411
68795e93	412	thread->handle = CreateThread(NULL, 0, Perl_ithread_run,
47ba8780	413	(LPVOID)thread, 0, &thread->thr);
47ba8780	414
82c40bf6	415	#else
fa26028c	416	{
	417	static pthread_attr_t attr;
	418	static int attr_inited = 0;
fa26028c	419	static int attr_joinable = PTHREAD_CREATE_JOINABLE;
	420	if (!attr_inited) {
	421	attr_inited = 1;
	422	pthread_attr_init(&attr);
	423	}
	424	# ifdef PTHREAD_ATTR_SETDETACHSTATE
	425	PTHREAD_ATTR_SETDETACHSTATE(&attr, attr_joinable);
	426	# endif
3eb37d38	427	# ifdef THREAD_CREATE_NEEDS_STACK
	428	if(pthread_attr_setstacksize(&attr, THREAD_CREATE_NEEDS_STACK))
	429	croak("panic: pthread_attr_setstacksize failed");
	430	# endif
	431
3ad0b7d6	432	#ifdef OLD_PTHREADS_API
68795e93	433	pthread_create( &thread->thr, attr, Perl_ithread_run, (void *)thread);
47ba8780	434	#else
68795e93	435	pthread_create( &thread->thr, &attr, Perl_ithread_run, (void *)thread);
47ba8780	436	#endif
3ad0b7d6	437	}
82c40bf6	438	#endif
62375a60	439	known_threads++;
58c2ef19	440	active_threads++;
58c2ef19	441	MUTEX_UNLOCK(&create_destruct_mutex);
95393226	442	sv_2mortal(params);
68795e93	443	return ithread_to_SV(aTHX_ obj, thread, classname, FALSE);
68795e93	444	}
47ba8780	445
68795e93	446	SV*
	447	Perl_ithread_self (pTHX_ SV obj, char Class)
	448	{
	449	ithread *thread;
	450	PERL_THREAD_GETSPECIFIC(self_key,thread);
	451	return ithread_to_SV(aTHX_ obj, thread, Class, TRUE);
47ba8780	452	}
	453
	454	/*
e1c44605	455	* Joins the thread this code needs to take the returnvalue from the
68795e93	456	* call_sv and send it back
b1edfb69	457	*/
47ba8780	458
68795e93	459	void
	460	Perl_ithread_CLONE(pTHX_ SV *obj)
	461	{
	462	if (SvROK(obj))
	463	{
	464	ithread *thread = SV_to_ithread(aTHX_ obj);
	465	}
	466	else
	467	{
	468	Perl_warn(aTHX_ "CLONE %_",obj);
	469	}
47ba8780	470	}
47ba8780	471
62375a60	472	AV*
68795e93	473	Perl_ithread_join(pTHX_ SV *obj)
	474	{
	475	ithread *thread = SV_to_ithread(aTHX_ obj);
	476	MUTEX_LOCK(&thread->mutex);
62375a60	477	if (thread->state & PERL_ITHR_DETACHED) {
a446a88f	478	MUTEX_UNLOCK(&thread->mutex);
	479	Perl_croak(aTHX_ "Cannot join a detached thread");
	480	}
62375a60	481	else if (thread->state & PERL_ITHR_JOINED) {
a446a88f	482	MUTEX_UNLOCK(&thread->mutex);
	483	Perl_croak(aTHX_ "Thread already joined");
	484	}
	485	else {
e1c44605	486	AV* retparam;
47ba8780	487	#ifdef WIN32
47ba8780	488	DWORD waitcode;
47ba8780	489	#else
47ba8780	490	void *retval;
47ba8780	491	#endif
47ba8780	492	MUTEX_UNLOCK(&thread->mutex);
68795e93	493	#ifdef WIN32
	494	waitcode = WaitForSingleObject(thread->handle, INFINITE);
	495	#else
	496	pthread_join(thread->thr,&retval);
	497	#endif
47ba8780	498	MUTEX_LOCK(&thread->mutex);
e1c44605	499
62375a60	500	/* sv_dup over the args */
e1c44605	501	{
62375a60	502	AV* params = (AV*) SvRV(thread->params);
e1c44605	503	CLONE_PARAMS clone_params;
3275ba96	504	clone_params.stashes = newAV();
e1c44605	505	PL_ptr_table = ptr_table_new();
e1c44605	506	retparam = (AV) sv_dup((SV)params, &clone_params);
3275ba96	507	SvREFCNT_dec(clone_params.stashes);
e1c44605	508	SvREFCNT_inc(retparam);
	509	ptr_table_free(PL_ptr_table);
	510	PL_ptr_table = NULL;
	511
	512	}
a446a88f	513	/* We have finished with it */
62375a60	514	thread->state \|= PERL_ITHR_JOINED;
47ba8780	515	MUTEX_UNLOCK(&thread->mutex);
e1c44605	516	return retparam;
68795e93	517	}
e1c44605	518	return (AV*)NULL;
47ba8780	519	}
47ba8780	520
68795e93	521	void
68795e93	522	Perl_ithread_DESTROY(pTHX_ SV *sv)
	523	{
	524	ithread *thread = SV_to_ithread(aTHX_ sv);
68795e93	525	sv_unmagic(SvRV(sv),PERL_MAGIC_shared_scalar);
68795e93	526	}
8222d950	527
73e09c8f	528	#endif /* USE_ITHREADS */
e1c44605	529
68795e93	530	MODULE = threads PACKAGE = threads PREFIX = ithread_
68795e93	531	PROTOTYPES: DISABLE
8222d950	532
73e09c8f	533	#ifdef USE_ITHREADS
73e09c8f	534
68795e93	535	void
	536	ithread_new (classname, function_to_call, ...)
	537	char * classname
	538	SV * function_to_call
	539	CODE:
	540	{
	541	AV* params = newAV();
	542	if (items > 2) {
	543	int i;
	544	for(i = 2; i < items ; i++) {
95393226	545	av_push(params, SvREFCNT_inc(ST(i)));
68795e93	546	}
	547	}
	548	ST(0) = sv_2mortal(Perl_ithread_create(aTHX_ Nullsv, classname, function_to_call, newRV_noinc((SV*) params)));
	549	XSRETURN(1);
	550	}
8222d950	551
68795e93	552	void
	553	ithread_self(char *classname)
	554	CODE:
	555	{
	556	ST(0) = sv_2mortal(Perl_ithread_self(aTHX_ Nullsv,classname));
	557	XSRETURN(1);
	558	}
47ba8780	559
47ba8780	560	int
68795e93	561	ithread_tid(ithread *thread)
47ba8780	562
47ba8780	563	void
68795e93	564	ithread_join(SV *obj)
e1c44605	565	PPCODE:
	566	{
	567	AV* params = Perl_ithread_join(aTHX_ obj);
	568	int i;
	569	I32 len = AvFILL(params);
	570	for (i = 0; i <= len; i++) {
1c3adb19	571	SV* tmp = av_shift(params);
	572	XPUSHs(tmp);
	573	sv_2mortal(tmp);
e1c44605	574	}
	575	SvREFCNT_dec(params);
	576	}
	577
f9dff5f5	578	void
f9dff5f5	579	ithread_yield(ithread *thread)
47ba8780	580
47ba8780	581	void
68795e93	582	ithread_detach(ithread *thread)
47ba8780	583
47ba8780	584	void
68795e93	585	ithread_DESTROY(SV *thread)
68795e93	586
73e09c8f	587	#endif /* USE_ITHREADS */
73e09c8f	588
68795e93	589	BOOT:
68795e93	590	{
73e09c8f	591	#ifdef USE_ITHREADS
68795e93	592	ithread* thread;
e1c44605	593	PL_perl_destruct_level = 2;
68795e93	594	PERL_THREAD_ALLOC_SPECIFIC(self_key);
58c2ef19	595	MUTEX_INIT(&create_destruct_mutex);
58c2ef19	596	MUTEX_LOCK(&create_destruct_mutex);
62375a60	597	PL_threadhook = &Perl_ithread_hook;
68795e93	598	thread = PerlMemShared_malloc(sizeof(ithread));
	599	Zero(thread,1,ithread);
	600	PL_perl_destruct_level = 2;
	601	MUTEX_INIT(&thread->mutex);
	602	threads = thread;
	603	thread->next = thread;
	604	thread->prev = thread;
	605	thread->interp = aTHX;
	606	thread->count = 1; /* imortal */
	607	thread->tid = tid_counter++;
62375a60	608	known_threads++;
58c2ef19	609	active_threads++;
62375a60	610	thread->state = 1;
68795e93	611	#ifdef WIN32
	612	thread->thr = GetCurrentThreadId();
	613	#else
	614	thread->thr = pthread_self();
	615	#endif
62375a60	616
68795e93	617	PERL_THREAD_SETSPECIFIC(self_key,thread);
58c2ef19	618	MUTEX_UNLOCK(&create_destruct_mutex);
73e09c8f	619	#endif /* USE_ITHREADS */
68795e93	620	}
68795e93	621