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

struct tctx
{
  void *coro;
  xcond_t wait_c;
  int wait_f;
};

static struct tctx *tctx_free;

static int available;
static int max_idle = 8;

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;

    for (;;)
      {
        /* TODO: should really use some idle time and exit after that */
        X_LOCK (perl_m);
        while (!perl_f)
          X_COND_WAIT (perl_c, perl_m);
        ctx = perl_f;
        perl_f = 0;
        --available;
        X_UNLOCK (perl_m);

        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);

        if (available >= max_idle)
          {
            X_UNLOCK (wait_m);
            break;
          }

        ++available;
        X_UNLOCK (wait_m);
      }
  }
}

static void
start_thread (void)
{
  xthread_t tid;

  ++available;
  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);

  if (!available)
    start_thread ();

  X_LOCK (perl_m);
  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_enable_0 (pTHX)
{
  thread_enable = 0;
}

static void
set_enable_1 (pTHX)
{
  thread_enable = 1;
}

static void
set_enable_2 (pTHX)
{
  thread_enable = 2;
}

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");

        /* 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_enable_1, set_enable_0);
        ENTER; /* see Guard.xs */

void
scoped_disable ()
        CODE:
        LEAVE; /* see Guard.xs */
        CORO_ENTERLEAVE_SCOPE_HOOK (set_enable_2, set_enable_0);
        ENTER; /* see Guard.xs */

U32
max_idle_threads (U32 max = NO_INIT)
        CODE:
        X_LOCK (wait_m);
        RETVAL = max_idle;
        if (items)
          max_idle = max;
        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:	1.4
Committed:	Sun Jun 28 17:39:42 2015 UTC (8 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.3:	+53 -0 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	1.4	static int global_enable = 1;
26			static int thread_enable; /* 0 undefined, 1 disabled, 2 enabled */
27
28	root	1.1	struct tctx
29			{
30			void *coro;
31	root	1.3	xcond_t wait_c;
32			int wait_f;
33	root	1.1	};
34
35			static struct tctx *tctx_free;
36
37			static int available;
38			static int max_idle = 8;
39
40	root	1.3	static xmutex_t perl_m = X_MUTEX_INIT;
41			static xcond_t perl_c = X_COND_INIT;
42			static struct tctx *perl_f;
43
44			static xmutex_t wait_m = X_MUTEX_INIT;
45	root	1.1
46			static int wakeup_f;
47			static struct tctx **waiters;
48			static int waiters_count, waiters_max;
49
50			static struct tctx *
51			tctx_get (void)
52			{
53			struct tctx *ctx;
54
55			if (!tctx_free)
56	root	1.3	{
57			ctx = malloc (sizeof (*tctx_free));
58			X_COND_CREATE (ctx->wait_c);
59			}
60	root	1.1	else
61			{
62			ctx = tctx_free;
63			tctx_free = tctx_free->coro;
64			}
65
66			return ctx;
67			}
68
69			static void
70			tctx_put (struct tctx *ctx)
71			{
72			ctx->coro = tctx_free;
73			tctx_free = ctx;
74			}
75
76			X_THREAD_PROC(thread_proc)
77			{
78			PERL_SET_CONTEXT (perl_thx);
79
80			{
81			dTHX; /* inefficient, we already have perl_thx, but I see no better way */
82			struct tctx *ctx;
83
84			for (;;)
85			{
86	root	1.2	/* TODO: should really use some idle time and exit after that */
87	root	1.1	X_LOCK (perl_m);
88			while (!perl_f)
89			X_COND_WAIT (perl_c, perl_m);
90			ctx = perl_f;
91			perl_f = 0;
92			--available;
93	root	1.3	X_UNLOCK (perl_m);
94
95	root	1.1	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
96
97			while (ctx->coro)
98			CORO_SCHEDULE;
99
100	root	1.3	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
101
102	root	1.1	X_LOCK (wait_m);
103	root	1.3	ctx->wait_f = 1;
104			X_COND_SIGNAL (ctx->wait_c);
105	root	1.1
106			if (available >= max_idle)
107			{
108			X_UNLOCK (wait_m);
109			break;
110			}
111
112			++available;
113			X_UNLOCK (wait_m);
114			}
115			}
116			}
117
118			static void
119			start_thread (void)
120			{
121			xthread_t tid;
122
123			++available;
124			xthread_create (&tid, thread_proc, 0);
125			}
126
127			static void
128			pmapi_release (void)
129			{
130	root	1.4	if (!(thread_enable ? thread_enable & 1 : global_enable))
131			{
132			pthread_setspecific (current_key, 0);
133			return;
134			}
135
136	root	1.1	struct tctx *ctx = tctx_get ();
137			ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
138	root	1.3	ctx->wait_f = 0;
139
140	root	1.1	pthread_setspecific (current_key, ctx);
141			pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
142
143			if (!available)
144			start_thread ();
145
146			X_LOCK (perl_m);
147			perl_f = ctx;
148			X_COND_SIGNAL (perl_c);
149			X_UNLOCK (perl_m);
150			}
151
152			static void
153			pmapi_acquire (void)
154			{
155			struct tctx *ctx = pthread_getspecific (current_key);
156
157	root	1.4	if (!ctx)
158			return;
159
160	root	1.1	X_LOCK (wait_m);
161
162			if (waiters_count >= waiters_max)
163			{
164			waiters_max = waiters_max ? waiters_max * 2 : 16;
165			waiters = realloc (waiters, waiters_max * sizeof (*waiters));
166			}
167
168			waiters [waiters_count++] = ctx;
169
170			s_epipe_signal (&ep);
171	root	1.3	while (!ctx->wait_f)
172			X_COND_WAIT (ctx->wait_c, wait_m);
173	root	1.1	X_UNLOCK (wait_m);
174
175			tctx_put (ctx);
176			pthread_sigmask (SIG_SETMASK, &cursigset, 0);
177			}
178
179	root	1.4	static void
180			set_enable_0 (pTHX)
181			{
182			thread_enable = 0;
183			}
184
185			static void
186			set_enable_1 (pTHX)
187			{
188			thread_enable = 1;
189			}
190
191			static void
192			set_enable_2 (pTHX)
193			{
194			thread_enable = 2;
195			}
196
197	root	1.1	MODULE = Coro::Multicore PACKAGE = Coro::Multicore
198
199			PROTOTYPES: DISABLE
200
201			BOOT:
202			{
203			#ifndef _WIN32
204			sigfillset (&fullsigset);
205			#endif
206
207			pthread_key_create (&current_key, 0);
208
209			if (s_epipe_new (&ep))
210			croak ("Coro::Multicore: unable to initialise event pipe.\n");
211
212			perl_thx = PERL_GET_CONTEXT;
213
214			I_CORO_API ("Coro::Multicore");
215
216			/* not perfectly efficient to do it this way, but it's simple */
217			perl_multicore_init ();
218			perl_multicore_api->pmapi_release = pmapi_release;
219			perl_multicore_api->pmapi_acquire = pmapi_acquire;
220			}
221
222	root	1.4	bool
223			enable (bool enable = NO_INIT)
224			CODE:
225			RETVAL = global_enable;
226			if (items)
227			global_enable = enable;
228			OUTPUT:
229			RETVAL
230
231			void
232			scoped_enable ()
233			CODE:
234			LEAVE; /* see Guard.xs */
235			CORO_ENTERLEAVE_SCOPE_HOOK (set_enable_1, set_enable_0);
236			ENTER; /* see Guard.xs */
237
238			void
239			scoped_disable ()
240			CODE:
241			LEAVE; /* see Guard.xs */
242			CORO_ENTERLEAVE_SCOPE_HOOK (set_enable_2, set_enable_0);
243			ENTER; /* see Guard.xs */
244
245	root	1.1	U32
246			max_idle_threads (U32 max = NO_INIT)
247			CODE:
248			X_LOCK (wait_m);
249			RETVAL = max_idle;
250			if (items)
251			max_idle = max;
252			X_UNLOCK (wait_m);
253			OUTPUT:
254			RETVAL
255
256
257			int
258			fd ()
259			CODE:
260			RETVAL = s_epipe_fd (&ep);
261			OUTPUT:
262			RETVAL
263
264			void
265			poll (...)
266			CODE:
267			s_epipe_drain (&ep);
268			X_LOCK (wait_m);
269			while (waiters_count)
270			{
271			struct tctx *ctx = waiters [--waiters_count];
272			CORO_READY ((SV *)ctx->coro);
273			SvREFCNT_dec_NN ((SV *)ctx->coro);
274			ctx->coro = 0;
275			}
276			X_UNLOCK (wait_m);
277
278			void
279	root	1.2	sleep (NV seconds)
280	root	1.1	CODE:
281			perlinterp_release ();
282	root	1.2	usleep (seconds * 1e6);
283	root	1.1	perlinterp_acquire ();
284	root	1.2