Coro-Multicore/Multicore.xs

#define PERL_NO_GET_CONTEXT

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

#define X_STACKSIZE 1024 * sizeof (void *)

#include "CoroAPI.h"
#include "perlmulticore.h"
#include "schmorp.h"
#include "xthread.h"

#ifdef _WIN32
  typedef char sigset_t;
  #define pthread_sigmask(mode,new,old)
#endif

#ifndef SvREFCNT_dec_NN
  #define SvREFCNT_dec_NN(sv) SvREFCNT_dec (sv)
#endif

#ifndef SvREFCNT_inc_NN
  #define SvREFCNT_inc_NN(sv) SvREFCNT_inc (sv)
#endif

#define RECURSION_CHECK 0

static X_TLS_DECLARE(current_key);
#if RECURSION_CHECK
static X_TLS_DECLARE(check_key);
#endif


static s_epipe ep;
static void *perl_thx;
static sigset_t cursigset, fullsigset;

static int global_enable = 0;
static int thread_enable; /* 0 undefined, 1 disabled, 2 enabled */

/* assigned to a thread for each release/acquire */
struct tctx
{
  void *coro;
  int wait_f;
  xcond_t acquire_c;
  int jeret;
};

static struct tctx *tctx_free;

static struct tctx *
tctx_get (void)
{
  struct tctx *ctx;

  if (!tctx_free)
    {
      ctx = malloc (sizeof (*tctx_free));
      X_COND_CREATE (ctx->acquire_c);
    }
  else
    {
      ctx = tctx_free;
      tctx_free = tctx_free->coro;
    }

  return ctx;
}

static void
tctx_put (struct tctx *ctx)
{
  ctx->coro = tctx_free;
  tctx_free = ctx;
}

/* a stack of tctxs */
struct tctxs
{
  struct tctx **ctxs;
  int cur, max;
};

static struct tctx *
tctxs_get (struct tctxs *ctxs)
{
  return ctxs->ctxs[--ctxs->cur];
}

static void
tctxs_put (struct tctxs *ctxs, struct tctx *ctx)
{
  if (ctxs->cur >= ctxs->max)
    {
      ctxs->max = ctxs->max ? ctxs->max * 2 : 16;
      ctxs->ctxs = realloc (ctxs->ctxs, ctxs->max * sizeof (ctxs->ctxs[0]));
    }

  ctxs->ctxs[ctxs->cur++] = ctx;
}

static xmutex_t release_m = X_MUTEX_INIT;
static xcond_t release_c = X_COND_INIT;
static struct tctxs releasers;
static int idle;
static int min_idle = 1;
static int curthreads, max_threads = 1; /* protected by release_m */

static xmutex_t acquire_m = X_MUTEX_INIT;
static struct tctxs acquirers;

X_THREAD_PROC(thread_proc)
{
  PERL_SET_CONTEXT (perl_thx);

  {
    dTHX; /* inefficient, we already have perl_thx, but I see no better way */
    dJMPENV;
    struct tctx *ctx;
    int catchret;

    X_LOCK (release_m);

    for (;;)
      {
        while (!releasers.cur)
          if (idle <= min_idle || 1)
            X_COND_WAIT (release_c, release_m);
          else
            {
              struct timespec ts = { time (0) + idle - min_idle, 0 };

              if (X_COND_TIMEDWAIT (release_c, release_m, ts) == ETIMEDOUT)
                if (idle > min_idle && !releasers.cur)
                  break;
            }

        ctx = tctxs_get (&releasers);
        --idle;
        X_UNLOCK (release_m);

        if (!ctx) /* timed out? */
          break;

        pthread_sigmask (SIG_SETMASK, &cursigset, 0);
        JMPENV_PUSH (ctx->jeret);

        if (!ctx->jeret)
          while (ctx->coro)
            CORO_SCHEDULE;

        JMPENV_POP;
        pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);

        X_LOCK (acquire_m);
        ctx->wait_f = 1;
        X_COND_SIGNAL (ctx->acquire_c);
        X_UNLOCK (acquire_m);

        X_LOCK (release_m);
        ++idle;
      }
  }
}

static void
start_thread (void)
{
  xthread_t tid;

  if (curthreads >= max_threads && 0)
    return;

  ++curthreads;
  ++idle;
  xthread_create (&tid, thread_proc, 0);
}

static void
pmapi_release (void)
{
  #if RECURSION_CHECK
  if (X_TLS_GET (check_key))
    croak ("perlinterp_release () called without valid perl context");

  X_TLS_SET (check_key, &check_key);
  #endif

  if (! ((thread_enable ? thread_enable : global_enable) & 1))
    {
      X_TLS_SET (current_key, 0);
      return;
    }

  struct tctx *ctx = tctx_get ();
  ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
  ctx->wait_f = 0;

  X_TLS_SET (current_key, ctx);
  pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);

  X_LOCK (release_m);

  if (idle <= min_idle)
    start_thread ();

  tctxs_put (&releasers, ctx);
  X_COND_SIGNAL (release_c);

  while (!idle && releasers.cur)
    {
      X_UNLOCK (release_m);
      X_LOCK (release_m);
    }

  X_UNLOCK (release_m);
}

static void
pmapi_acquire (void)
{
  int jeret;
  struct tctx *ctx = X_TLS_GET (current_key);

  #if RECURSION_CHECK
  if (X_TLS_GET (check_key) != &check_key)
    croak ("perlinterp_acquire () called with valid perl context");

  X_TLS_SET (check_key, 0);
  #endif

  if (!ctx)
    return;

  X_LOCK (acquire_m);

  tctxs_put (&acquirers, ctx);

  s_epipe_signal (&ep);
  while (!ctx->wait_f)
    X_COND_WAIT (ctx->acquire_c, acquire_m);
  X_UNLOCK (acquire_m);

  jeret = ctx->jeret;
  tctx_put (ctx);
  pthread_sigmask (SIG_SETMASK, &cursigset, 0);

  if (jeret)
    JMPENV_JUMP (jeret);
}

static void
set_thread_enable (pTHX_ void *arg)
{
  thread_enable = PTR2IV (arg);
}

MODULE = Coro::Multicore                PACKAGE = Coro::Multicore

PROTOTYPES: DISABLE

BOOT:
{
#ifndef _WIN32
        sigfillset (&fullsigset);
#endif

        X_TLS_INIT (current_key);
#if RECURSION_CHECK
        X_TLS_INIT (check_key);
#endif

        if (s_epipe_new (&ep))
          croak ("Coro::Multicore: unable to initialise event pipe.\n");

        perl_thx = PERL_GET_CONTEXT;

        I_CORO_API ("Coro::Multicore");

        X_LOCK (release_m);
        while (idle < min_idle)
          start_thread ();
        X_UNLOCK (release_m);

        /* not perfectly efficient to do it this way, but it is simple */
        perl_multicore_init (); /* calls release */
        perl_multicore_api->pmapi_release = pmapi_release;
        perl_multicore_api->pmapi_acquire = pmapi_acquire;
}

bool
enable (bool enable = NO_INIT)
        CODE:
        RETVAL = global_enable;
        if (items)
          global_enable = enable;
        OUTPUT:
        RETVAL

void
scoped_enable ()
        CODE:
        LEAVE; /* see Guard.xs */
        CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void *)1, set_thread_enable, (void *)0);
        ENTER; /* see Guard.xs */

void
scoped_disable ()
        CODE:
        LEAVE; /* see Guard.xs */
        CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void *)2, set_thread_enable, (void *)0);
        ENTER; /* see Guard.xs */

U32
min_idle_threads (U32 min = NO_INIT)
        CODE:
        X_LOCK (acquire_m);
        RETVAL = min_idle;
        if (items)
          min_idle = min;
        X_UNLOCK (acquire_m);
        OUTPUT:
        RETVAL
        

int
fd ()
        CODE:
        RETVAL = s_epipe_fd (&ep);
        OUTPUT:
        RETVAL

void
poll (...)
        CODE:
        s_epipe_drain (&ep);
        X_LOCK (acquire_m);
        while (acquirers.cur)
          {
            struct tctx *ctx = tctxs_get (&acquirers);
            CORO_READY ((SV *)ctx->coro);
            SvREFCNT_dec_NN ((SV *)ctx->coro);
            ctx->coro = 0;
          }
        X_UNLOCK (acquire_m);

void
sleep (NV seconds)
        CODE:
        perlinterp_release ();
        usleep (seconds * 1e6);
        perlinterp_acquire ();

Revision:	1.16
Committed:	Sun Jan 24 04:20:49 2016 UTC (8 years, 4 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_03
Changes since 1.15:	+25 -2 lines
Log Message:	* empty log message *
#	Content
1	#define PERL_NO_GET_CONTEXT
2
3	#include "EXTERN.h"
4	#include "perl.h"
5	#include "XSUB.h"
6
7	#define X_STACKSIZE 1024 * sizeof (void *)
8
9	#include "CoroAPI.h"
10	#include "perlmulticore.h"
11	#include "schmorp.h"
12	#include "xthread.h"
13
14	#ifdef _WIN32
15	typedef char sigset_t;
16	#define pthread_sigmask(mode,new,old)
17	#endif
18
19	#ifndef SvREFCNT_dec_NN
20	#define SvREFCNT_dec_NN(sv) SvREFCNT_dec (sv)
21	#endif
22
23	#ifndef SvREFCNT_inc_NN
24	#define SvREFCNT_inc_NN(sv) SvREFCNT_inc (sv)
25	#endif
26
27	#define RECURSION_CHECK 0
28
29	static X_TLS_DECLARE(current_key);
30	#if RECURSION_CHECK
31	static X_TLS_DECLARE(check_key);
32	#endif
33
34
35	static s_epipe ep;
36	static void *perl_thx;
37	static sigset_t cursigset, fullsigset;
38
39	static int global_enable = 0;
40	static int thread_enable; /* 0 undefined, 1 disabled, 2 enabled */
41
42	/* assigned to a thread for each release/acquire */
43	struct tctx
44	{
45	void *coro;
46	int wait_f;
47	xcond_t acquire_c;
48	int jeret;
49	};
50
51	static struct tctx *tctx_free;
52
53	static struct tctx *
54	tctx_get (void)
55	{
56	struct tctx *ctx;
57
58	if (!tctx_free)
59	{
60	ctx = malloc (sizeof (*tctx_free));
61	X_COND_CREATE (ctx->acquire_c);
62	}
63	else
64	{
65	ctx = tctx_free;
66	tctx_free = tctx_free->coro;
67	}
68
69	return ctx;
70	}
71
72	static void
73	tctx_put (struct tctx *ctx)
74	{
75	ctx->coro = tctx_free;
76	tctx_free = ctx;
77	}
78
79	/* a stack of tctxs */
80	struct tctxs
81	{
82	struct tctx **ctxs;
83	int cur, max;
84	};
85
86	static struct tctx *
87	tctxs_get (struct tctxs *ctxs)
88	{
89	return ctxs->ctxs[--ctxs->cur];
90	}
91
92	static void
93	tctxs_put (struct tctxs ctxs, struct tctx ctx)
94	{
95	if (ctxs->cur >= ctxs->max)
96	{
97	ctxs->max = ctxs->max ? ctxs->max * 2 : 16;
98	ctxs->ctxs = realloc (ctxs->ctxs, ctxs->max * sizeof (ctxs->ctxs[0]));
99	}
100
101	ctxs->ctxs[ctxs->cur++] = ctx;
102	}
103
104	static xmutex_t release_m = X_MUTEX_INIT;
105	static xcond_t release_c = X_COND_INIT;
106	static struct tctxs releasers;
107	static int idle;
108	static int min_idle = 1;
109	static int curthreads, max_threads = 1; /* protected by release_m */
110
111	static xmutex_t acquire_m = X_MUTEX_INIT;
112	static struct tctxs acquirers;
113
114	X_THREAD_PROC(thread_proc)
115	{
116	PERL_SET_CONTEXT (perl_thx);
117
118	{
119	dTHX; /* inefficient, we already have perl_thx, but I see no better way */
120	dJMPENV;
121	struct tctx *ctx;
122	int catchret;
123
124	X_LOCK (release_m);
125
126	for (;;)
127	{
128	while (!releasers.cur)
129	if (idle <= min_idle \|\| 1)
130	X_COND_WAIT (release_c, release_m);
131	else
132	{
133	struct timespec ts = { time (0) + idle - min_idle, 0 };
134
135	if (X_COND_TIMEDWAIT (release_c, release_m, ts) == ETIMEDOUT)
136	if (idle > min_idle && !releasers.cur)
137	break;
138	}
139
140	ctx = tctxs_get (&releasers);
141	--idle;
142	X_UNLOCK (release_m);
143
144	if (!ctx) /* timed out? */
145	break;
146
147	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
148	JMPENV_PUSH (ctx->jeret);
149
150	if (!ctx->jeret)
151	while (ctx->coro)
152	CORO_SCHEDULE;
153
154	JMPENV_POP;
155	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
156
157	X_LOCK (acquire_m);
158	ctx->wait_f = 1;
159	X_COND_SIGNAL (ctx->acquire_c);
160	X_UNLOCK (acquire_m);
161
162	X_LOCK (release_m);
163	++idle;
164	}
165	}
166	}
167
168	static void
169	start_thread (void)
170	{
171	xthread_t tid;
172
173	if (curthreads >= max_threads && 0)
174	return;
175
176	++curthreads;
177	++idle;
178	xthread_create (&tid, thread_proc, 0);
179	}
180
181	static void
182	pmapi_release (void)
183	{
184	#if RECURSION_CHECK
185	if (X_TLS_GET (check_key))
186	croak ("perlinterp_release () called without valid perl context");
187
188	X_TLS_SET (check_key, &check_key);
189	#endif
190
191	if (! ((thread_enable ? thread_enable : global_enable) & 1))
192	{
193	X_TLS_SET (current_key, 0);
194	return;
195	}
196
197	struct tctx *ctx = tctx_get ();
198	ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
199	ctx->wait_f = 0;
200
201	X_TLS_SET (current_key, ctx);
202	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
203
204	X_LOCK (release_m);
205
206	if (idle <= min_idle)
207	start_thread ();
208
209	tctxs_put (&releasers, ctx);
210	X_COND_SIGNAL (release_c);
211
212	while (!idle && releasers.cur)
213	{
214	X_UNLOCK (release_m);
215	X_LOCK (release_m);
216	}
217
218	X_UNLOCK (release_m);
219	}
220
221	static void
222	pmapi_acquire (void)
223	{
224	int jeret;
225	struct tctx *ctx = X_TLS_GET (current_key);
226
227	#if RECURSION_CHECK
228	if (X_TLS_GET (check_key) != &check_key)
229	croak ("perlinterp_acquire () called with valid perl context");
230
231	X_TLS_SET (check_key, 0);
232	#endif
233
234	if (!ctx)
235	return;
236
237	X_LOCK (acquire_m);
238
239	tctxs_put (&acquirers, ctx);
240
241	s_epipe_signal (&ep);
242	while (!ctx->wait_f)
243	X_COND_WAIT (ctx->acquire_c, acquire_m);
244	X_UNLOCK (acquire_m);
245
246	jeret = ctx->jeret;
247	tctx_put (ctx);
248	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
249
250	if (jeret)
251	JMPENV_JUMP (jeret);
252	}
253
254	static void
255	set_thread_enable (pTHX_ void *arg)
256	{
257	thread_enable = PTR2IV (arg);
258	}
259
260	MODULE = Coro::Multicore PACKAGE = Coro::Multicore
261
262	PROTOTYPES: DISABLE
263
264	BOOT:
265	{
266	#ifndef _WIN32
267	sigfillset (&fullsigset);
268	#endif
269
270	X_TLS_INIT (current_key);
271	#if RECURSION_CHECK
272	X_TLS_INIT (check_key);
273	#endif
274
275	if (s_epipe_new (&ep))
276	croak ("Coro::Multicore: unable to initialise event pipe.\n");
277
278	perl_thx = PERL_GET_CONTEXT;
279
280	I_CORO_API ("Coro::Multicore");
281
282	X_LOCK (release_m);
283	while (idle < min_idle)
284	start_thread ();
285	X_UNLOCK (release_m);
286
287	/* not perfectly efficient to do it this way, but it is simple */
288	perl_multicore_init (); /* calls release */
289	perl_multicore_api->pmapi_release = pmapi_release;
290	perl_multicore_api->pmapi_acquire = pmapi_acquire;
291	}
292
293	bool
294	enable (bool enable = NO_INIT)
295	CODE:
296	RETVAL = global_enable;
297	if (items)
298	global_enable = enable;
299	OUTPUT:
300	RETVAL
301
302	void
303	scoped_enable ()
304	CODE:
305	LEAVE; /* see Guard.xs */
306	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )1, set_thread_enable, (void )0);
307	ENTER; /* see Guard.xs */
308
309	void
310	scoped_disable ()
311	CODE:
312	LEAVE; /* see Guard.xs */
313	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )2, set_thread_enable, (void )0);
314	ENTER; /* see Guard.xs */
315
316	U32
317	min_idle_threads (U32 min = NO_INIT)
318	CODE:
319	X_LOCK (acquire_m);
320	RETVAL = min_idle;
321	if (items)
322	min_idle = min;
323	X_UNLOCK (acquire_m);
324	OUTPUT:
325	RETVAL
326
327
328	int
329	fd ()
330	CODE:
331	RETVAL = s_epipe_fd (&ep);
332	OUTPUT:
333	RETVAL
334
335	void
336	poll (...)
337	CODE:
338	s_epipe_drain (&ep);
339	X_LOCK (acquire_m);
340	while (acquirers.cur)
341	{
342	struct tctx *ctx = tctxs_get (&acquirers);
343	CORO_READY ((SV *)ctx->coro);
344	SvREFCNT_dec_NN ((SV *)ctx->coro);
345	ctx->coro = 0;
346	}
347	X_UNLOCK (acquire_m);
348
349	void
350	sleep (NV seconds)
351	CODE:
352	perlinterp_release ();
353	usleep (seconds * 1e6);
354	perlinterp_acquire ();
355