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 idle_timeout;
static int idle;
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:	1.5
Committed:	Sun Jun 28 18:43:17 2015 UTC (8 years, 11 months ago) by root
Branch:	MAIN
Changes since 1.4:	+2 -1 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 -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	static int global_enable = 1;
26	static int thread_enable; /* 0 undefined, 1 disabled, 2 enabled */
27
28	struct tctx
29	{
30	void *coro;
31	xcond_t wait_c;
32	int wait_f;
33	};
34
35	static struct tctx *tctx_free;
36
37	static int idle_timeout;
38	static int idle;
39	static int max_idle = 8;
40
41	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
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	{
58	ctx = malloc (sizeof (*tctx_free));
59	X_COND_CREATE (ctx->wait_c);
60	}
61	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	for (;;)
86	{
87	/* TODO: should really use some idle time and exit after that */
88	X_LOCK (perl_m);
89	while (!perl_f)
90	X_COND_WAIT (perl_c, perl_m);
91	ctx = perl_f;
92	perl_f = 0;
93	--available;
94	X_UNLOCK (perl_m);
95
96	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
97
98	while (ctx->coro)
99	CORO_SCHEDULE;
100
101	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
102
103	X_LOCK (wait_m);
104	ctx->wait_f = 1;
105	X_COND_SIGNAL (ctx->wait_c);
106
107	if (available >= max_idle)
108	{
109	X_UNLOCK (wait_m);
110	break;
111	}
112
113	++available;
114	X_UNLOCK (wait_m);
115	}
116	}
117	}
118
119	static void
120	start_thread (void)
121	{
122	xthread_t tid;
123
124	++available;
125	xthread_create (&tid, thread_proc, 0);
126	}
127
128	static void
129	pmapi_release (void)
130	{
131	if (!(thread_enable ? thread_enable & 1 : global_enable))
132	{
133	pthread_setspecific (current_key, 0);
134	return;
135	}
136
137	struct tctx *ctx = tctx_get ();
138	ctx->coro = SvREFCNT_inc_NN (CORO_CURRENT);
139	ctx->wait_f = 0;
140
141	pthread_setspecific (current_key, ctx);
142	pthread_sigmask (SIG_SETMASK, &fullsigset, &cursigset);
143
144	if (!available)
145	start_thread ();
146
147	X_LOCK (perl_m);
148	perl_f = ctx;
149	X_COND_SIGNAL (perl_c);
150	X_UNLOCK (perl_m);
151	}
152
153	static void
154	pmapi_acquire (void)
155	{
156	struct tctx *ctx = pthread_getspecific (current_key);
157
158	if (!ctx)
159	return;
160
161	X_LOCK (wait_m);
162
163	if (waiters_count >= waiters_max)
164	{
165	waiters_max = waiters_max ? waiters_max * 2 : 16;
166	waiters = realloc (waiters, waiters_max * sizeof (*waiters));
167	}
168
169	waiters [waiters_count++] = ctx;
170
171	s_epipe_signal (&ep);
172	while (!ctx->wait_f)
173	X_COND_WAIT (ctx->wait_c, wait_m);
174	X_UNLOCK (wait_m);
175
176	tctx_put (ctx);
177	pthread_sigmask (SIG_SETMASK, &cursigset, 0);
178	}
179
180	static void
181	set_enable_0 (pTHX)
182	{
183	thread_enable = 0;
184	}
185
186	static void
187	set_enable_1 (pTHX)
188	{
189	thread_enable = 1;
190	}
191
192	static void
193	set_enable_2 (pTHX)
194	{
195	thread_enable = 2;
196	}
197
198	MODULE = Coro::Multicore PACKAGE = Coro::Multicore
199
200	PROTOTYPES: DISABLE
201
202	BOOT:
203	{
204	#ifndef _WIN32
205	sigfillset (&fullsigset);
206	#endif
207
208	pthread_key_create (&current_key, 0);
209
210	if (s_epipe_new (&ep))
211	croak ("Coro::Multicore: unable to initialise event pipe.\n");
212
213	perl_thx = PERL_GET_CONTEXT;
214
215	I_CORO_API ("Coro::Multicore");
216
217	/* not perfectly efficient to do it this way, but it's simple */
218	perl_multicore_init ();
219	perl_multicore_api->pmapi_release = pmapi_release;
220	perl_multicore_api->pmapi_acquire = pmapi_acquire;
221	}
222
223	bool
224	enable (bool enable = NO_INIT)
225	CODE:
226	RETVAL = global_enable;
227	if (items)
228	global_enable = enable;
229	OUTPUT:
230	RETVAL
231
232	void
233	scoped_enable ()
234	CODE:
235	LEAVE; /* see Guard.xs */
236	CORO_ENTERLEAVE_SCOPE_HOOK (set_enable_1, set_enable_0);
237	ENTER; /* see Guard.xs */
238
239	void
240	scoped_disable ()
241	CODE:
242	LEAVE; /* see Guard.xs */
243	CORO_ENTERLEAVE_SCOPE_HOOK (set_enable_2, set_enable_0);
244	ENTER; /* see Guard.xs */
245
246	U32
247	max_idle_threads (U32 max = NO_INIT)
248	CODE:
249	X_LOCK (wait_m);
250	RETVAL = max_idle;
251	if (items)
252	max_idle = max;
253	X_UNLOCK (wait_m);
254	OUTPUT:
255	RETVAL
256
257
258	int
259	fd ()
260	CODE:
261	RETVAL = s_epipe_fd (&ep);
262	OUTPUT:
263	RETVAL
264
265	void
266	poll (...)
267	CODE:
268	s_epipe_drain (&ep);
269	X_LOCK (wait_m);
270	while (waiters_count)
271	{
272	struct tctx *ctx = waiters [--waiters_count];
273	CORO_READY ((SV *)ctx->coro);
274	SvREFCNT_dec_NN ((SV *)ctx->coro);
275	ctx->coro = 0;
276	}
277	X_UNLOCK (wait_m);
278
279	void
280	sleep (NV seconds)
281	CODE:
282	perlinterp_release ();
283	usleep (seconds * 1e6);
284	perlinterp_acquire ();
285