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 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:	1.8
Committed:	Wed Jul 1 22:39:07 2015 UTC (8 years, 11 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_02
Changes since 1.7:	+8 -0 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 pthread_key_t 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 wait_c;
42	};
43
44	static struct tctx *tctx_free;
45
46	static int idle;
47	static int min_idle = 1;
48
49	static xmutex_t perl_m = X_MUTEX_INIT;
50	static xcond_t perl_c = X_COND_INIT;
51	static struct tctx *perl_f;
52
53	static xmutex_t wait_m = X_MUTEX_INIT;
54
55	static int wakeup_f;
56	static struct tctx **waiters;
57	static int waiters_count, waiters_max;
58
59	static struct tctx *
60	tctx_get (void)
61	{
62	struct tctx *ctx;
63
64	if (!tctx_free)
65	{
66	ctx = malloc (sizeof (*tctx_free));
67	X_COND_CREATE (ctx->wait_c);
68	}
69	else
70	{
71	ctx = tctx_free;
72	tctx_free = tctx_free->coro;
73	}
74
75	return ctx;
76	}
77
78	static void
79	tctx_put (struct tctx *ctx)
80	{
81	ctx->coro = tctx_free;
82	tctx_free = ctx;
83	}
84
85	X_THREAD_PROC(thread_proc)
86	{
87	PERL_SET_CONTEXT (perl_thx);
88
89	{
90	dTHX; /* inefficient, we already have perl_thx, but I see no better way */
91	struct tctx *ctx;
92
93	X_LOCK (perl_m);
94
95	for (;;)
96	{
97	while (!perl_f)
98	if (idle <= min_idle \|\| 1)
99	X_COND_WAIT (perl_c, perl_m);
100	else
101	{
102	struct timespec ts = { time (0) + idle - min_idle, 0 };
103
104	if (X_COND_TIMEDWAIT (perl_c, perl_m, ts) == ETIMEDOUT)
105	if (idle > min_idle && !perl_f)
106	break;
107	}
108
109	ctx = perl_f;
110	perl_f = 0;
111	--idle;
112	X_UNLOCK (perl_m);
113
114	if (!ctx) /* timed out? */
115	break;
116
117	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
118
119	while (ctx->coro)
120	CORO_SCHEDULE;
121
122	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
123
124	X_LOCK (wait_m);
125	ctx->wait_f = 1;
126	X_COND_SIGNAL (ctx->wait_c);
127	X_UNLOCK (wait_m);
128
129	X_LOCK (perl_m);
130	++idle;
131	}
132	}
133	}
134
135	static void
136	start_thread (void)
137	{
138	xthread_t tid;
139
140	++idle;
141	xthread_create (&tid, thread_proc, 0);
142	}
143
144	static void
145	pmapi_release (void)
146	{
147	if (!(thread_enable ? thread_enable & 1 : global_enable))
148	{
149	pthread_setspecific (current_key, 0);
150	return;
151	}
152
153	struct tctx *ctx = tctx_get ();
154	ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
155	ctx->wait_f = 0;
156
157	pthread_setspecific (current_key, ctx);
158	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
159
160	X_LOCK (perl_m);
161
162	if (idle <= min_idle)
163	start_thread ();
164
165	perl_f = ctx;
166	X_COND_SIGNAL (perl_c);
167
168	X_UNLOCK (perl_m);
169	}
170
171	static void
172	pmapi_acquire (void)
173	{
174	struct tctx *ctx = pthread_getspecific (current_key);
175
176	if (!ctx)
177	return;
178
179	X_LOCK (wait_m);
180
181	if (waiters_count >= waiters_max)
182	{
183	waiters_max = waiters_max ? waiters_max * 2 : 16;
184	waiters = realloc (waiters, waiters_max * sizeof (*waiters));
185	}
186
187	waiters [waiters_count++] = ctx;
188
189	s_epipe_signal (&ep);
190	while (!ctx->wait_f)
191	X_COND_WAIT (ctx->wait_c, wait_m);
192	X_UNLOCK (wait_m);
193
194	tctx_put (ctx);
195	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
196	}
197
198	static void
199	set_thread_enable (pTHX_ void *arg)
200	{
201	thread_enable = PTR2IV (arg);
202	}
203
204	MODULE = Coro::Multicore PACKAGE = Coro::Multicore
205
206	PROTOTYPES: DISABLE
207
208	BOOT:
209	{
210	#ifndef _WIN32
211	sigfillset (&fullsigset);
212	#endif
213
214	pthread_key_create (&current_key, 0);
215
216	if (s_epipe_new (&ep))
217	croak ("Coro::Multicore: unable to initialise event pipe.\n");
218
219	perl_thx = PERL_GET_CONTEXT;
220
221	I_CORO_API ("Coro::Multicore");
222
223	X_LOCK (perl_m);
224	while (idle < min_idle)
225	start_thread ();
226	start_thread ();//D
227	X_UNLOCK (perl_m);
228
229	/* not perfectly efficient to do it this way, but it's simple */
230	perl_multicore_init ();
231	perl_multicore_api->pmapi_release = pmapi_release;
232	perl_multicore_api->pmapi_acquire = pmapi_acquire;
233	}
234
235	bool
236	enable (bool enable = NO_INIT)
237	CODE:
238	RETVAL = global_enable;
239	if (items)
240	global_enable = enable;
241	OUTPUT:
242	RETVAL
243
244	void
245	scoped_enable ()
246	CODE:
247	LEAVE; /* see Guard.xs */
248	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )1, set_thread_enable, (void )0);
249	ENTER; /* see Guard.xs */
250
251	void
252	scoped_disable ()
253	CODE:
254	LEAVE; /* see Guard.xs */
255	CORO_ENTERLEAVE_SCOPE_HOOK (set_thread_enable, (void )2, set_thread_enable, (void )0);
256	ENTER; /* see Guard.xs */
257
258	U32
259	min_idle_threads (U32 min = NO_INIT)
260	CODE:
261	X_LOCK (wait_m);
262	RETVAL = min_idle;
263	if (items)
264	min_idle = min;
265	X_UNLOCK (wait_m);
266	OUTPUT:
267	RETVAL
268
269
270	int
271	fd ()
272	CODE:
273	RETVAL = s_epipe_fd (&ep);
274	OUTPUT:
275	RETVAL
276
277	void
278	poll (...)
279	CODE:
280	s_epipe_drain (&ep);
281	X_LOCK (wait_m);
282	while (waiters_count)
283	{
284	struct tctx *ctx = waiters [--waiters_count];
285	CORO_READY ((SV *)ctx->coro);
286	SvREFCNT_dec_NN ((SV *)ctx->coro);
287	ctx->coro = 0;
288	}
289	X_UNLOCK (wait_m);
290
291	void
292	sleep (NV seconds)
293	CODE:
294	perlinterp_release ();
295	usleep (seconds * 1e6);
296	perlinterp_acquire ();
297