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

static X_TLS_DECLARE(current_key);

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 (! ((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 (!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 (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_acquire ();
        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:	1.14
Committed:	Sat Dec 19 23:56:14 2015 UTC (8 years, 5 months ago) by root
Branch:	MAIN
Changes since 1.13:	+3 -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	static X_TLS_DECLARE(current_key);
28
29	static s_epipe ep;
30	static void *perl_thx;
31	static sigset_t cursigset, fullsigset;
32
33	static int global_enable = 0;
34	static int thread_enable; /* 0 undefined, 1 disabled, 2 enabled */
35
36	/* assigned to a thread for each release/acquire */
37	struct tctx
38	{
39	void *coro;
40	int wait_f;
41	xcond_t acquire_c;
42	int jeret;
43	};
44
45	static struct tctx *tctx_free;
46
47	static struct tctx *
48	tctx_get (void)
49	{
50	struct tctx *ctx;
51
52	if (!tctx_free)
53	{
54	ctx = malloc (sizeof (*tctx_free));
55	X_COND_CREATE (ctx->acquire_c);
56	}
57	else
58	{
59	ctx = tctx_free;
60	tctx_free = tctx_free->coro;
61	}
62
63	return ctx;
64	}
65
66	static void
67	tctx_put (struct tctx *ctx)
68	{
69	ctx->coro = tctx_free;
70	tctx_free = ctx;
71	}
72
73	/* a stack of tctxs */
74	struct tctxs
75	{
76	struct tctx **ctxs;
77	int cur, max;
78	};
79
80	static struct tctx *
81	tctxs_get (struct tctxs *ctxs)
82	{
83	return ctxs->ctxs[--ctxs->cur];
84	}
85
86	static void
87	tctxs_put (struct tctxs ctxs, struct tctx ctx)
88	{
89	if (ctxs->cur >= ctxs->max)
90	{
91	ctxs->max = ctxs->max ? ctxs->max * 2 : 16;
92	ctxs->ctxs = realloc (ctxs->ctxs, ctxs->max * sizeof (ctxs->ctxs[0]));
93	}
94
95	ctxs->ctxs[ctxs->cur++] = ctx;
96	}
97
98	static xmutex_t release_m = X_MUTEX_INIT;
99	static xcond_t release_c = X_COND_INIT;
100	static struct tctxs releasers;
101	static int idle;
102	static int min_idle = 1;
103	static int curthreads, max_threads = 1; /* protected by release_m */
104
105	static xmutex_t acquire_m = X_MUTEX_INIT;
106	static struct tctxs acquirers;
107
108	X_THREAD_PROC(thread_proc)
109	{
110	PERL_SET_CONTEXT (perl_thx);
111
112	{
113	dTHX; /* inefficient, we already have perl_thx, but I see no better way */
114	dJMPENV;
115	struct tctx *ctx;
116	int catchret;
117
118	X_LOCK (release_m);
119
120	for (;;)
121	{
122	while (!releasers.cur)
123	if (idle <= min_idle \|\| 1)
124	X_COND_WAIT (release_c, release_m);
125	else
126	{
127	struct timespec ts = { time (0) + idle - min_idle, 0 };
128
129	if (X_COND_TIMEDWAIT (release_c, release_m, ts) == ETIMEDOUT)
130	if (idle > min_idle && !releasers.cur)
131	break;
132	}
133
134	ctx = tctxs_get (&releasers);
135	--idle;
136	X_UNLOCK (release_m);
137
138	if (!ctx) /* timed out? */
139	break;
140
141	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
142	JMPENV_PUSH (ctx->jeret);
143
144	if (!ctx->jeret)
145	while (ctx->coro)
146	CORO_SCHEDULE;
147
148	JMPENV_POP;
149	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
150
151	X_LOCK (acquire_m);
152	ctx->wait_f = 1;
153	X_COND_SIGNAL (ctx->acquire_c);
154	X_UNLOCK (acquire_m);
155
156	X_LOCK (release_m);
157	++idle;
158	}
159	}
160	}
161
162	static void
163	start_thread (void)
164	{
165	xthread_t tid;
166
167	if (curthreads >= max_threads && 0)
168	return;
169
170	++curthreads;
171	++idle;
172	xthread_create (&tid, thread_proc, 0);
173	}
174
175	static void
176	pmapi_release (void)
177	{
178	if (! ((thread_enable ? thread_enable : global_enable) & 1))
179	{
180	X_TLS_SET (current_key, 0);
181	return;
182	}
183
184	struct tctx *ctx = tctx_get ();
185	ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
186	ctx->wait_f = 0;
187
188	X_TLS_SET (current_key, ctx);
189	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
190
191	X_LOCK (release_m);
192
193	if (idle <= min_idle)
194	start_thread ();
195
196	tctxs_put (&releasers, ctx);
197	X_COND_SIGNAL (release_c);
198
199	while (!idle && releasers.cur)
200	{
201	X_UNLOCK (release_m);
202	X_LOCK (release_m);
203	}
204
205	X_UNLOCK (release_m);
206	}
207
208	static void
209	pmapi_acquire (void)
210	{
211	int jeret;
212	struct tctx *ctx = X_TLS_GET (current_key);
213
214	if (!ctx)
215	return;
216
217	X_LOCK (acquire_m);
218
219	tctxs_put (&acquirers, ctx);
220
221	s_epipe_signal (&ep);
222	while (!ctx->wait_f)
223	X_COND_WAIT (ctx->acquire_c, acquire_m);
224	X_UNLOCK (acquire_m);
225
226	jeret = ctx->jeret;
227	tctx_put (ctx);
228	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
229
230	if (jeret)
231	JMPENV_JUMP (jeret);
232	}
233
234	static void
235	set_thread_enable (pTHX_ void *arg)
236	{
237	thread_enable = PTR2IV (arg);
238	}
239
240	MODULE = Coro::Multicore PACKAGE = Coro::Multicore
241
242	PROTOTYPES: DISABLE
243
244	BOOT:
245	{
246	#ifndef _WIN32
247	sigfillset (&fullsigset);
248	#endif
249
250	X_TLS_INIT (current_key);
251
252	if (s_epipe_new (&ep))
253	croak ("Coro::Multicore: unable to initialise event pipe.\n");
254
255	perl_thx = PERL_GET_CONTEXT;
256
257	I_CORO_API ("Coro::Multicore");
258
259	X_LOCK (release_m);
260	while (idle < min_idle)
261	start_thread ();
262	X_UNLOCK (release_m);
263
264	/* not perfectly efficient to do it this way, but it is simple */
265	perl_multicore_init (); /* calls release */
266	perl_multicore_acquire ();
267	perl_multicore_api->pmapi_release = pmapi_release;
268	perl_multicore_api->pmapi_acquire = pmapi_acquire;
269	}
270
271	bool
272	enable (bool enable = NO_INIT)
273	CODE:
274	RETVAL = global_enable;
275	if (items)
276	global_enable = enable;
277	OUTPUT:
278	RETVAL
279
280	void
281	scoped_enable ()
282	CODE:
283	LEAVE; /* see Guard.xs */
284	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )1, set_thread_enable, (void )0);
285	ENTER; /* see Guard.xs */
286
287	void
288	scoped_disable ()
289	CODE:
290	LEAVE; /* see Guard.xs */
291	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )2, set_thread_enable, (void )0);
292	ENTER; /* see Guard.xs */
293
294	U32
295	min_idle_threads (U32 min = NO_INIT)
296	CODE:
297	X_LOCK (acquire_m);
298	RETVAL = min_idle;
299	if (items)
300	min_idle = min;
301	X_UNLOCK (acquire_m);
302	OUTPUT:
303	RETVAL
304
305
306	int
307	fd ()
308	CODE:
309	RETVAL = s_epipe_fd (&ep);
310	OUTPUT:
311	RETVAL
312
313	void
314	poll (...)
315	CODE:
316	s_epipe_drain (&ep);
317	X_LOCK (acquire_m);
318	while (acquirers.cur)
319	{
320	struct tctx *ctx = tctxs_get (&acquirers);
321	CORO_READY ((SV *)ctx->coro);
322	SvREFCNT_dec_NN ((SV *)ctx->coro);
323	ctx->coro = 0;
324	}
325	X_UNLOCK (acquire_m);
326
327	void
328	sleep (NV seconds)
329	CODE:
330	perlinterp_release ();
331	usleep (seconds * 1e6);
332	perlinterp_acquire ();
333