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 (10 years, 7 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_03
Changes since 1.15:	+25 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#define PERL_NO_GET_CONTEXT
2
3			#include "EXTERN.h"
4			#include "perl.h"
5			#include "XSUB.h"
6
7	root	1.7	#define X_STACKSIZE 1024 * sizeof (void *)
8	root	1.1
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	root	1.8	#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	root	1.16	#define RECURSION_CHECK 0
28
29	root	1.12	static X_TLS_DECLARE(current_key);
30	root	1.16	#if RECURSION_CHECK
31			static X_TLS_DECLARE(check_key);
32			#endif
33
34	root	1.1
35			static s_epipe ep;
36			static void *perl_thx;
37			static sigset_t cursigset, fullsigset;
38
39	root	1.6	static int global_enable = 0;
40	root	1.4	static int thread_enable; /* 0 undefined, 1 disabled, 2 enabled */
41
42	root	1.6	/* assigned to a thread for each release/acquire */
43	root	1.1	struct tctx
44			{
45			void *coro;
46	root	1.6	int wait_f;
47	root	1.9	xcond_t acquire_c;
48	root	1.11	int jeret;
49	root	1.1	};
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	root	1.3	{
60			ctx = malloc (sizeof (*tctx_free));
61	root	1.9	X_COND_CREATE (ctx->acquire_c);
62	root	1.3	}
63	root	1.1	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	root	1.9	/* 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	root	1.1	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	root	1.11	dJMPENV;
121	root	1.1	struct tctx *ctx;
122	root	1.11	int catchret;
123	root	1.1
124	root	1.9	X_LOCK (release_m);
125	root	1.6
126	root	1.1	for (;;)
127			{
128	root	1.9	while (!releasers.cur)
129	root	1.6	if (idle <= min_idle \|\| 1)
130	root	1.9	X_COND_WAIT (release_c, release_m);
131	root	1.6	else
132			{
133			struct timespec ts = { time (0) + idle - min_idle, 0 };
134
135	root	1.9	if (X_COND_TIMEDWAIT (release_c, release_m, ts) == ETIMEDOUT)
136			if (idle > min_idle && !releasers.cur)
137	root	1.6	break;
138			}
139
140	root	1.9	ctx = tctxs_get (&releasers);
141	root	1.6	--idle;
142	root	1.9	X_UNLOCK (release_m);
143	root	1.3
144	root	1.6	if (!ctx) /* timed out? */
145			break;
146
147	root	1.1	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
148	root	1.11	JMPENV_PUSH (ctx->jeret);
149	root	1.1
150	root	1.11	if (!ctx->jeret)
151			while (ctx->coro)
152			CORO_SCHEDULE;
153	root	1.1
154	root	1.11	JMPENV_POP;
155	root	1.3	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
156
157	root	1.9	X_LOCK (acquire_m);
158	root	1.3	ctx->wait_f = 1;
159	root	1.9	X_COND_SIGNAL (ctx->acquire_c);
160			X_UNLOCK (acquire_m);
161	root	1.1
162	root	1.9	X_LOCK (release_m);
163	root	1.6	++idle;
164	root	1.1	}
165			}
166			}
167
168			static void
169			start_thread (void)
170			{
171			xthread_t tid;
172
173	root	1.9	if (curthreads >= max_threads && 0)
174			return;
175
176			++curthreads;
177	root	1.6	++idle;
178	root	1.1	xthread_create (&tid, thread_proc, 0);
179			}
180
181			static void
182			pmapi_release (void)
183			{
184	root	1.16	#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	root	1.13	if (! ((thread_enable ? thread_enable : global_enable) & 1))
192	root	1.4	{
193	root	1.12	X_TLS_SET (current_key, 0);
194	root	1.4	return;
195			}
196
197	root	1.1	struct tctx *ctx = tctx_get ();
198			ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
199	root	1.3	ctx->wait_f = 0;
200
201	root	1.12	X_TLS_SET (current_key, ctx);
202	root	1.1	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
203
204	root	1.9	X_LOCK (release_m);
205	root	1.6
206			if (idle <= min_idle)
207	root	1.1	start_thread ();
208
209	root	1.9	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	root	1.6
218	root	1.9	X_UNLOCK (release_m);
219	root	1.1	}
220
221			static void
222			pmapi_acquire (void)
223			{
224	root	1.11	int jeret;
225	root	1.12	struct tctx *ctx = X_TLS_GET (current_key);
226	root	1.1
227	root	1.16	#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	root	1.4	if (!ctx)
235			return;
236
237	root	1.9	X_LOCK (acquire_m);
238	root	1.1
239	root	1.9	tctxs_put (&acquirers, ctx);
240	root	1.1
241			s_epipe_signal (&ep);
242	root	1.3	while (!ctx->wait_f)
243	root	1.9	X_COND_WAIT (ctx->acquire_c, acquire_m);
244			X_UNLOCK (acquire_m);
245	root	1.1
246	root	1.11	jeret = ctx->jeret;
247	root	1.1	tctx_put (ctx);
248			pthread_sigmask (SIG_SETMASK, &cursigset, 0);
249	root	1.11
250			if (jeret)
251			JMPENV_JUMP (jeret);
252	root	1.1	}
253
254	root	1.4	static void
255	root	1.6	set_thread_enable (pTHX_ void *arg)
256	root	1.4	{
257	root	1.6	thread_enable = PTR2IV (arg);
258	root	1.4	}
259
260	root	1.1	MODULE = Coro::Multicore PACKAGE = Coro::Multicore
261
262			PROTOTYPES: DISABLE
263
264			BOOT:
265			{
266	root	1.16	#ifndef _WIN32
267	root	1.1	sigfillset (&fullsigset);
268	root	1.16	#endif
269	root	1.1
270	root	1.12	X_TLS_INIT (current_key);
271	root	1.16	#if RECURSION_CHECK
272			X_TLS_INIT (check_key);
273			#endif
274	root	1.1
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	root	1.9	X_LOCK (release_m);
283	root	1.6	while (idle < min_idle)
284			start_thread ();
285	root	1.9	X_UNLOCK (release_m);
286	root	1.6
287	root	1.14	/* not perfectly efficient to do it this way, but it is simple */
288			perl_multicore_init (); /* calls release */
289	root	1.1	perl_multicore_api->pmapi_release = pmapi_release;
290			perl_multicore_api->pmapi_acquire = pmapi_acquire;
291			}
292
293	root	1.4	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	root	1.6	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )1, set_thread_enable, (void )0);
307	root	1.4	ENTER; /* see Guard.xs */
308
309			void
310			scoped_disable ()
311			CODE:
312			LEAVE; /* see Guard.xs */
313	root	1.6	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )2, set_thread_enable, (void )0);
314	root	1.4	ENTER; /* see Guard.xs */
315
316	root	1.1	U32
317	root	1.6	min_idle_threads (U32 min = NO_INIT)
318	root	1.1	CODE:
319	root	1.9	X_LOCK (acquire_m);
320	root	1.6	RETVAL = min_idle;
321	root	1.1	if (items)
322	root	1.6	min_idle = min;
323	root	1.9	X_UNLOCK (acquire_m);
324	root	1.1	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	root	1.9	X_LOCK (acquire_m);
340			while (acquirers.cur)
341	root	1.1	{
342	root	1.9	struct tctx *ctx = tctxs_get (&acquirers);
343	root	1.1	CORO_READY ((SV *)ctx->coro);
344			SvREFCNT_dec_NN ((SV *)ctx->coro);
345			ctx->coro = 0;
346			}
347	root	1.9	X_UNLOCK (acquire_m);
348	root	1.1
349			void
350	root	1.2	sleep (NV seconds)
351	root	1.1	CODE:
352			perlinterp_release ();
353	root	1.2	usleep (seconds * 1e6);
354	root	1.1	perlinterp_acquire ();
355	root	1.2