Coro-Multicore/Multicore.xs

#define PERL_NO_GET_CONTEXT

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

#define X_STACKSIZE -1

#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

static pthread_key_t 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 wait_c;
};

static struct tctx *tctx_free;

static int idle;
static int min_idle = 1;

static xmutex_t perl_m = X_MUTEX_INIT;
static xcond_t perl_c = X_COND_INIT;
static struct tctx *perl_f;

static xmutex_t wait_m = X_MUTEX_INIT;

static int wakeup_f;
static struct tctx **waiters;
static int waiters_count, waiters_max;

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

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

X_THREAD_PROC(thread_proc)
{
  PERL_SET_CONTEXT (perl_thx);

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

    X_LOCK (perl_m);

    for (;;)
      {
        while (!perl_f)
          if (idle <= min_idle || 1)
            X_COND_WAIT (perl_c, perl_m);
          else
            {
              struct timespec ts = { time (0) + idle - min_idle, 0 };

              if (X_COND_TIMEDWAIT (perl_c, perl_m, ts) == ETIMEDOUT)
                if (idle > min_idle && !perl_f)
                  break;
            }

        ctx = perl_f;
        perl_f = 0;
        --idle;
        X_UNLOCK (perl_m);

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

        pthread_sigmask (SIG_SETMASK, &cursigset, 0);

        while (ctx->coro)
          CORO_SCHEDULE;

        pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);

        X_LOCK (wait_m);
        ctx->wait_f = 1;
        X_COND_SIGNAL (ctx->wait_c);
        X_UNLOCK (wait_m);

        X_LOCK (perl_m);
        ++idle;
      }
  }
}

static void
start_thread (void)
{
  xthread_t tid;

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

static void
pmapi_release (void)
{
  if (!(thread_enable ? thread_enable & 1 : global_enable))
    {
      pthread_setspecific (current_key, 0);
      return;
    }

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

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

  X_LOCK (perl_m);

  if (idle <= min_idle)
    start_thread ();

  perl_f = ctx;
  X_COND_SIGNAL (perl_c);

  X_UNLOCK (perl_m);
}

static void
pmapi_acquire (void)
{
  struct tctx *ctx = pthread_getspecific (current_key);

  if (!ctx)
    return;

  X_LOCK (wait_m);

  if (waiters_count >= waiters_max)
    {
      waiters_max = waiters_max ? waiters_max * 2 : 16;
      waiters = realloc (waiters, waiters_max * sizeof (*waiters));
    }

  waiters [waiters_count++] = ctx;

  s_epipe_signal (&ep);
  while (!ctx->wait_f)
    X_COND_WAIT (ctx->wait_c, wait_m);
  X_UNLOCK (wait_m);

  tctx_put (ctx);
  pthread_sigmask (SIG_SETMASK, &cursigset, 0);
}

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

        pthread_key_create (&current_key, 0);

        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 (perl_m);
        while (idle < min_idle)
          start_thread ();
        start_thread ();//D
        X_UNLOCK (perl_m);

        /* not perfectly efficient to do it this way, but it's simple */
        perl_multicore_init ();
        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 (wait_m);
        RETVAL = min_idle;
        if (items)
          min_idle = min;
        X_UNLOCK (wait_m);
        OUTPUT:
        RETVAL
        

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

void
poll (...)
        CODE:
        s_epipe_drain (&ep);
        X_LOCK (wait_m);
        while (waiters_count)
          {
            struct tctx *ctx = waiters [--waiters_count];
            CORO_READY ((SV *)ctx->coro);
            SvREFCNT_dec_NN ((SV *)ctx->coro);
            ctx->coro = 0;
          }
        X_UNLOCK (wait_m);

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

Revision:	1.6
Committed:	Mon Jun 29 13:15:53 2015 UTC (8 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.5:	+42 -38 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			#define X_STACKSIZE -1
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			static pthread_key_t current_key;
20
21			static s_epipe ep;
22			static void *perl_thx;
23			static sigset_t cursigset, fullsigset;
24
25	root	1.6	static int global_enable = 0;
26	root	1.4	static int thread_enable; /* 0 undefined, 1 disabled, 2 enabled */
27
28	root	1.6	/* assigned to a thread for each release/acquire */
29	root	1.1	struct tctx
30			{
31			void *coro;
32	root	1.6	int wait_f;
33	root	1.3	xcond_t wait_c;
34	root	1.1	};
35
36			static struct tctx *tctx_free;
37
38	root	1.5	static int idle;
39	root	1.6	static int min_idle = 1;
40	root	1.1
41	root	1.3	static xmutex_t perl_m = X_MUTEX_INIT;
42			static xcond_t perl_c = X_COND_INIT;
43			static struct tctx *perl_f;
44
45			static xmutex_t wait_m = X_MUTEX_INIT;
46	root	1.1
47			static int wakeup_f;
48			static struct tctx **waiters;
49			static int waiters_count, waiters_max;
50
51			static struct tctx *
52			tctx_get (void)
53			{
54			struct tctx *ctx;
55
56			if (!tctx_free)
57	root	1.3	{
58			ctx = malloc (sizeof (*tctx_free));
59			X_COND_CREATE (ctx->wait_c);
60			}
61	root	1.1	else
62			{
63			ctx = tctx_free;
64			tctx_free = tctx_free->coro;
65			}
66
67			return ctx;
68			}
69
70			static void
71			tctx_put (struct tctx *ctx)
72			{
73			ctx->coro = tctx_free;
74			tctx_free = ctx;
75			}
76
77			X_THREAD_PROC(thread_proc)
78			{
79			PERL_SET_CONTEXT (perl_thx);
80
81			{
82			dTHX; /* inefficient, we already have perl_thx, but I see no better way */
83			struct tctx *ctx;
84
85	root	1.6	X_LOCK (perl_m);
86
87	root	1.1	for (;;)
88			{
89			while (!perl_f)
90	root	1.6	if (idle <= min_idle \|\| 1)
91			X_COND_WAIT (perl_c, perl_m);
92			else
93			{
94			struct timespec ts = { time (0) + idle - min_idle, 0 };
95
96			if (X_COND_TIMEDWAIT (perl_c, perl_m, ts) == ETIMEDOUT)
97			if (idle > min_idle && !perl_f)
98			break;
99			}
100
101	root	1.1	ctx = perl_f;
102			perl_f = 0;
103	root	1.6	--idle;
104	root	1.3	X_UNLOCK (perl_m);
105
106	root	1.6	if (!ctx) /* timed out? */
107			break;
108
109	root	1.1	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
110
111			while (ctx->coro)
112			CORO_SCHEDULE;
113
114	root	1.3	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
115
116	root	1.1	X_LOCK (wait_m);
117	root	1.3	ctx->wait_f = 1;
118			X_COND_SIGNAL (ctx->wait_c);
119	root	1.6	X_UNLOCK (wait_m);
120	root	1.1
121	root	1.6	X_LOCK (perl_m);
122			++idle;
123	root	1.1	}
124			}
125			}
126
127			static void
128			start_thread (void)
129			{
130			xthread_t tid;
131
132	root	1.6	++idle;
133	root	1.1	xthread_create (&tid, thread_proc, 0);
134			}
135
136			static void
137			pmapi_release (void)
138			{
139	root	1.4	if (!(thread_enable ? thread_enable & 1 : global_enable))
140			{
141			pthread_setspecific (current_key, 0);
142			return;
143			}
144
145	root	1.1	struct tctx *ctx = tctx_get ();
146			ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
147	root	1.3	ctx->wait_f = 0;
148
149	root	1.1	pthread_setspecific (current_key, ctx);
150			pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
151
152	root	1.6	X_LOCK (perl_m);
153
154			if (idle <= min_idle)
155	root	1.1	start_thread ();
156
157			perl_f = ctx;
158			X_COND_SIGNAL (perl_c);
159	root	1.6
160	root	1.1	X_UNLOCK (perl_m);
161			}
162
163			static void
164			pmapi_acquire (void)
165			{
166			struct tctx *ctx = pthread_getspecific (current_key);
167
168	root	1.4	if (!ctx)
169			return;
170
171	root	1.1	X_LOCK (wait_m);
172
173			if (waiters_count >= waiters_max)
174			{
175			waiters_max = waiters_max ? waiters_max * 2 : 16;
176			waiters = realloc (waiters, waiters_max * sizeof (*waiters));
177			}
178
179			waiters [waiters_count++] = ctx;
180
181			s_epipe_signal (&ep);
182	root	1.3	while (!ctx->wait_f)
183			X_COND_WAIT (ctx->wait_c, wait_m);
184	root	1.1	X_UNLOCK (wait_m);
185
186			tctx_put (ctx);
187			pthread_sigmask (SIG_SETMASK, &cursigset, 0);
188			}
189
190	root	1.4	static void
191	root	1.6	set_thread_enable (pTHX_ void *arg)
192	root	1.4	{
193	root	1.6	thread_enable = PTR2IV (arg);
194	root	1.4	}
195
196	root	1.1	MODULE = Coro::Multicore PACKAGE = Coro::Multicore
197
198			PROTOTYPES: DISABLE
199
200			BOOT:
201			{
202			#ifndef _WIN32
203			sigfillset (&fullsigset);
204			#endif
205
206			pthread_key_create (&current_key, 0);
207
208			if (s_epipe_new (&ep))
209			croak ("Coro::Multicore: unable to initialise event pipe.\n");
210
211			perl_thx = PERL_GET_CONTEXT;
212
213			I_CORO_API ("Coro::Multicore");
214
215	root	1.6	X_LOCK (perl_m);
216			while (idle < min_idle)
217			start_thread ();
218			start_thread ();//D
219			X_UNLOCK (perl_m);
220
221	root	1.1	/* not perfectly efficient to do it this way, but it's simple */
222			perl_multicore_init ();
223			perl_multicore_api->pmapi_release = pmapi_release;
224			perl_multicore_api->pmapi_acquire = pmapi_acquire;
225			}
226
227	root	1.4	bool
228			enable (bool enable = NO_INIT)
229			CODE:
230			RETVAL = global_enable;
231			if (items)
232			global_enable = enable;
233			OUTPUT:
234			RETVAL
235
236			void
237			scoped_enable ()
238			CODE:
239			LEAVE; /* see Guard.xs */
240	root	1.6	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )1, set_thread_enable, (void )0);
241	root	1.4	ENTER; /* see Guard.xs */
242
243			void
244			scoped_disable ()
245			CODE:
246			LEAVE; /* see Guard.xs */
247	root	1.6	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )2, set_thread_enable, (void )0);
248	root	1.4	ENTER; /* see Guard.xs */
249
250	root	1.1	U32
251	root	1.6	min_idle_threads (U32 min = NO_INIT)
252	root	1.1	CODE:
253			X_LOCK (wait_m);
254	root	1.6	RETVAL = min_idle;
255	root	1.1	if (items)
256	root	1.6	min_idle = min;
257	root	1.1	X_UNLOCK (wait_m);
258			OUTPUT:
259			RETVAL
260
261
262			int
263			fd ()
264			CODE:
265			RETVAL = s_epipe_fd (&ep);
266			OUTPUT:
267			RETVAL
268
269			void
270			poll (...)
271			CODE:
272			s_epipe_drain (&ep);
273			X_LOCK (wait_m);
274			while (waiters_count)
275			{
276			struct tctx *ctx = waiters [--waiters_count];
277			CORO_READY ((SV *)ctx->coro);
278			SvREFCNT_dec_NN ((SV *)ctx->coro);
279			ctx->coro = 0;
280			}
281			X_UNLOCK (wait_m);
282
283			void
284	root	1.2	sleep (NV seconds)
285	root	1.1	CODE:
286			perlinterp_release ();
287	root	1.2	usleep (seconds * 1e6);
288	root	1.1	perlinterp_acquire ();
289	root	1.2