IO-AIO/AIO.xs

#define PERL_NO_GET_CONTEXT

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

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sched.h>
#include <endian.h>

#include <pthread.h>
#include <sys/syscall.h>

typedef void *InputStream;  /* hack, but 5.6.1 is simply toooo old ;) */
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
typedef void *InOutStream;  /* hack, but 5.6.1 is simply toooo old ;) */

#if __i386 || __amd64
# define STACKSIZE ( 256 * sizeof (long))
#elif __ia64
# define STACKSIZE (8192 * sizeof (long))
#else
# define STACKSIZE ( 512 * sizeof (long))
#endif

enum {
  REQ_QUIT,
  REQ_OPEN, REQ_CLOSE,
  REQ_READ, REQ_WRITE, REQ_READAHEAD,
  REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
  REQ_FSYNC, REQ_FDATASYNC,
};

typedef struct aio_cb {
  struct aio_cb *volatile next;

  int type;

  int fd;
  off_t offset;
  size_t length;
  ssize_t result;
  mode_t mode; /* open */
  int errorno;
  SV *data, *callback;
  void *dataptr;
  STRLEN dataoffset;

  Stat_t *statdata;
} aio_cb;

typedef aio_cb *aio_req;

static int started;
static int nreqs;
static int respipe [2];

static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t  reqwait = PTHREAD_COND_INITIALIZER;

static volatile aio_req reqs, reqe; /* queue start, queue end */
static volatile aio_req ress, rese; /* queue start, queue end */

static void *aio_proc(void *arg);

static void
start_thread (void)
{
  sigset_t fullsigset, oldsigset;
  pthread_t tid;
  pthread_attr_t attr;

  pthread_attr_init (&attr);
  pthread_attr_setstacksize (&attr, STACKSIZE);
  pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);

  sigfillset (&fullsigset);
  sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);

  if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
    started++;

  sigprocmask (SIG_SETMASK, &oldsigset, 0);
}

static void
send_req (aio_req req)
{
  nreqs++;

  pthread_mutex_lock (&reqlock);

  req->next = 0;

  if (reqe)
    {
      reqe->next = req;
      reqe = req;
    }
  else
    reqe = reqs = req;

  pthread_cond_signal (&reqwait);
  pthread_mutex_unlock (&reqlock);
}

static void
end_thread (void)
{
  aio_req req;
  New (0, req, 1, aio_cb);
  req->type = REQ_QUIT;

  send_req (req);
}

static void
read_write (pTHX_
            int dowrite, int fd, off_t offset, size_t length,
            SV *data, STRLEN dataoffset, SV *callback)
{
  aio_req req;
  STRLEN svlen;
  char *svptr = SvPV (data, svlen);

  SvUPGRADE (data, SVt_PV);
  SvPOK_on (data);

  if (dataoffset < 0)
    dataoffset += svlen;

  if (dataoffset < 0 || dataoffset > svlen)
    croak ("data offset outside of string");

  if (dowrite)
    {
      /* write: check length and adjust. */
      if (length < 0 || length + dataoffset > svlen)
        length = svlen - dataoffset;
    }
  else
    {
      /* read: grow scalar as necessary */
      svptr = SvGROW (data, length + dataoffset);
    }

  if (length < 0)
    croak ("length must not be negative");

  Newz (0, req, 1, aio_cb);

  if (!req)
    croak ("out of memory during aio_req allocation");

  req->type = dowrite ? REQ_WRITE : REQ_READ;
  req->fd = fd;
  req->offset = offset;
  req->length = length;
  req->data = SvREFCNT_inc (data);
  req->dataptr = (char *)svptr + dataoffset;
  req->callback = SvREFCNT_inc (callback);

  send_req (req);
}

static void
poll_wait ()
{
  if (!nreqs)
    return;

  fd_set rfd;
  FD_ZERO(&rfd);
  FD_SET(respipe [0], &rfd);

  select (respipe [0] + 1, &rfd, 0, 0, 0);
}

static int
poll_cb (pTHX)
{
  dSP;
  int count = 0;
  aio_req req;
  
  {
    /* read and signals sent by the worker threads */
    char buf [32];
    while (read (respipe [0], buf, 32) > 0)
      ;
  }

  for (;;)
    {
      pthread_mutex_lock (&reslock);

      req = ress;

      if (ress)
        {
          ress = ress->next;
          if (!ress) rese = 0;
        }

      pthread_mutex_unlock (&reslock);

      if (!req)
        break;

      nreqs--;

      if (req->type == REQ_QUIT)
        started--;
      else
        {
          int errorno = errno;
          errno = req->errorno;

          if (req->type == REQ_READ)
            SvCUR_set (req->data, req->dataoffset
                                  + req->result > 0 ? req->result : 0);

          if (req->data)
            SvREFCNT_dec (req->data);

          if (req->type == REQ_STAT || req->type == REQ_LSTAT || req->type == REQ_FSTAT)
            {
              PL_laststype   = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
              PL_laststatval = req->result;
              PL_statcache   = *(req->statdata);

              Safefree (req->statdata);
            }

          PUSHMARK (SP);
          XPUSHs (sv_2mortal (newSViv (req->result)));

          if (req->type == REQ_OPEN)
            {
              /* convert fd to fh */
              SV *fh;

              PUTBACK;
              call_pv ("IO::AIO::_fd2fh", G_SCALAR | G_EVAL);
              SPAGAIN;

              fh = POPs;

              PUSHMARK (SP);
              XPUSHs (fh);
            }

          PUTBACK;
          call_sv (req->callback, G_VOID | G_EVAL);
          SPAGAIN;
          
          if (req->callback)
            SvREFCNT_dec (req->callback);

          errno = errorno;
          count++;
        }

      Safefree (req);
    }

  return count;
}

static void *
aio_proc (void *thr_arg)
{
  aio_req req;
  int type;

  do
    {
      pthread_mutex_lock (&reqlock);

      for (;;)
        {
          req = reqs;

          if (reqs)
            {
              reqs = reqs->next;
              if (!reqs) reqe = 0;
            }

          if (req)
            break;

          pthread_cond_wait (&reqwait, &reqlock);
        }

      pthread_mutex_unlock (&reqlock);
     
      errno = 0; /* strictly unnecessary */

      type = req->type;

      switch (type)
        {
          case REQ_READ:      req->result = pread64   (req->fd, req->dataptr, req->length, req->offset); break;
          case REQ_WRITE:     req->result = pwrite64  (req->fd, req->dataptr, req->length, req->offset); break;
#if SYS_readahead
          case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
#else
          case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
#endif

          case REQ_STAT:      req->result = stat      (req->dataptr, req->statdata); break;
          case REQ_LSTAT:     req->result = lstat     (req->dataptr, req->statdata); break;
          case REQ_FSTAT:     req->result = fstat     (req->fd     , req->statdata); break;

          case REQ_OPEN:      req->result = open      (req->dataptr, req->fd, req->mode); break;
          case REQ_CLOSE:     req->result = close     (req->fd); break;
          case REQ_UNLINK:    req->result = unlink    (req->dataptr); break;

          case REQ_FSYNC:     req->result = fsync     (req->fd); break;
          case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;

          case REQ_QUIT:
            break;

          default:
            req->result = ENOSYS;
            break;
        }

      req->errorno = errno;

      pthread_mutex_lock (&reslock);

      req->next = 0;

      if (rese)
        {
          rese->next = req;
          rese = req;
        }
      else
        {
          rese = ress = req;

          /* write a dummy byte to the pipe so fh becomes ready */
          write (respipe [1], &respipe, 1);
        }

      pthread_mutex_unlock (&reslock);
    }
  while (type != REQ_QUIT);

  return 0;
}

MODULE = IO::AIO                PACKAGE = IO::AIO

BOOT:
{
        if (pipe (respipe))
          croak ("unable to initialize result pipe");

        if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
          croak ("cannot set result pipe to nonblocking mode");

        if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
          croak ("cannot set result pipe to nonblocking mode");
}

void
min_parallel(nthreads)
        int     nthreads
        PROTOTYPE: $
        CODE:
        while (nthreads > started)
          start_thread ();

void
max_parallel(nthreads)
        int     nthreads
        PROTOTYPE: $
        CODE:
{
        int cur = started;
        while (cur > nthreads)
          {          
            end_thread ();
            cur--;
          }

        while (started > nthreads)
          {
            poll_wait ();
            poll_cb (aTHX);
          }
}

void
aio_open(pathname,flags,mode,callback)
        SV *    pathname
        int     flags
        int     mode
        SV *    callback
        PROTOTYPE: $$$$
        CODE:
{
        aio_req req;

        Newz (0, req, 1, aio_cb);

        if (!req)
          croak ("out of memory during aio_req allocation");

        req->type = REQ_OPEN;
        req->data = newSVsv (pathname);
        req->dataptr = SvPV_nolen (req->data);
        req->fd = flags;
        req->mode = mode;
        req->callback = SvREFCNT_inc (callback);

        send_req (req);
}

void
aio_close(fh,callback)
        InputStream     fh
        SV *            callback
        PROTOTYPE: $$
        ALIAS:
           aio_close     = REQ_CLOSE
           aio_fsync     = REQ_FSYNC
           aio_fdatasync = REQ_FDATASYNC
        CODE:
{
        aio_req req;

        Newz (0, req, 1, aio_cb);

        if (!req)
          croak ("out of memory during aio_req allocation");

        req->type = ix;
        req->fd = PerlIO_fileno (fh);
        req->callback = SvREFCNT_inc (callback);

        send_req (req);
}

void
aio_read(fh,offset,length,data,dataoffset,callback)
        InputStream     fh
        UV              offset
        IV              length
        SV *            data
        IV              dataoffset
        SV *            callback
        PROTOTYPE: $$$$$$
        CODE:
        read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);

void
aio_write(fh,offset,length,data,dataoffset,callback)
        OutputStream    fh
        UV              offset
        IV              length
        SV *            data
        IV              dataoffset
        SV *            callback
        PROTOTYPE: $$$$$$
        CODE:
        read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);

void
aio_readahead(fh,offset,length,callback)
        InputStream     fh
        UV              offset
        IV              length
        SV *            callback
        PROTOTYPE: $$$$
        CODE:
{
        aio_req req;

        if (length < 0)
          croak ("length must not be negative");

        Newz (0, req, 1, aio_cb);

        if (!req)
          croak ("out of memory during aio_req allocation");

        req->type = REQ_READAHEAD;
        req->fd = PerlIO_fileno (fh);
        req->offset = offset;
        req->length = length;
        req->callback = SvREFCNT_inc (callback);

        send_req (req);
}

void
aio_stat(fh_or_path,callback)
        SV *            fh_or_path
        SV *            callback
        PROTOTYPE: $$
        ALIAS:
           aio_lstat = 1
        CODE:
{
        aio_req req;

        Newz (0, req, 1, aio_cb);

        if (!req)
          croak ("out of memory during aio_req allocation");

        New (0, req->statdata, 1, Stat_t);

        if (!req->statdata)
          croak ("out of memory during aio_req->statdata allocation");

        if (SvPOK (fh_or_path))
          {
            req->type = ix ? REQ_LSTAT : REQ_STAT;
            req->data = newSVsv (fh_or_path);
            req->dataptr = SvPV_nolen (req->data);
          }
        else
          {
            req->type = REQ_FSTAT;
            req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
          }

        req->callback = SvREFCNT_inc (callback);

        send_req (req);
}

void
aio_unlink(pathname,callback)
        SV * pathname
        SV * callback
        PROTOTYPE: $$
        CODE:
{
        aio_req req;
        
        Newz (0, req, 1, aio_cb);
        
        if (!req)
          croak ("out of memory during aio_req allocation");
        
        req->type = REQ_UNLINK;
        req->data = newSVsv (pathname);
        req->dataptr = SvPV_nolen (req->data);
        req->callback = SvREFCNT_inc (callback);
        
        send_req (req);
}

int
poll_fileno()
        PROTOTYPE:
        CODE:
        RETVAL = respipe [0];
        OUTPUT:
        RETVAL

int
poll_cb(...)
        PROTOTYPE:
        CODE:
        RETVAL = poll_cb (aTHX);
        OUTPUT:
        RETVAL

void
poll_wait()
        PROTOTYPE:
        CODE:
        if (nreqs)
          poll_wait ();

int
nreqs()
        PROTOTYPE:
        CODE:
        RETVAL = nreqs;
        OUTPUT:
        RETVAL

Revision:	1.3
Committed:	Sun Jul 10 20:07:11 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.2:	+98 -37 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			#include <sys/types.h>
8			#include <sys/stat.h>
9			#include <unistd.h>
10			#include <fcntl.h>
11			#include <signal.h>
12			#include <sched.h>
13			#include <endian.h>
14
15			#include <pthread.h>
16			#include <sys/syscall.h>
17
18			typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
19			typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
20			typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
21
22			#if __i386 \|\| __amd64
23			# define STACKSIZE ( 256 * sizeof (long))
24			#elif __ia64
25			# define STACKSIZE (8192 * sizeof (long))
26			#else
27			# define STACKSIZE ( 512 * sizeof (long))
28			#endif
29
30			enum {
31			REQ_QUIT,
32			REQ_OPEN, REQ_CLOSE,
33			REQ_READ, REQ_WRITE, REQ_READAHEAD,
34			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
35			REQ_FSYNC, REQ_FDATASYNC,
36			};
37
38			typedef struct aio_cb {
39	root	1.3	struct aio_cb *volatile next;
40	root	1.1
41			int type;
42
43			int fd;
44			off_t offset;
45			size_t length;
46			ssize_t result;
47			mode_t mode; /* open */
48			int errorno;
49			SV data, callback;
50			void *dataptr;
51			STRLEN dataoffset;
52
53			Stat_t *statdata;
54			} aio_cb;
55
56			typedef aio_cb *aio_req;
57
58			static int started;
59			static int nreqs;
60	root	1.3	static int respipe [2];
61	root	1.1
62	root	1.3	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
63			static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
64			static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
65
66			static volatile aio_req reqs, reqe; /* queue start, queue end */
67			static volatile aio_req ress, rese; /* queue start, queue end */
68	root	1.1
69			static void aio_proc(void arg);
70
71			static void
72			start_thread (void)
73			{
74			sigset_t fullsigset, oldsigset;
75			pthread_t tid;
76			pthread_attr_t attr;
77
78			pthread_attr_init (&attr);
79			pthread_attr_setstacksize (&attr, STACKSIZE);
80			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
81
82			sigfillset (&fullsigset);
83			sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
84
85			if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
86			started++;
87
88			sigprocmask (SIG_SETMASK, &oldsigset, 0);
89			}
90
91			static void
92			send_req (aio_req req)
93			{
94			nreqs++;
95	root	1.3
96			pthread_mutex_lock (&reqlock);
97
98	root	1.1	req->next = 0;
99
100	root	1.3	if (reqe)
101	root	1.1	{
102	root	1.3	reqe->next = req;
103			reqe = req;
104	root	1.1	}
105			else
106	root	1.3	reqe = reqs = req;
107	root	1.1
108	root	1.3	pthread_cond_signal (&reqwait);
109			pthread_mutex_unlock (&reqlock);
110	root	1.1	}
111
112			static void
113			end_thread (void)
114			{
115			aio_req req;
116			New (0, req, 1, aio_cb);
117			req->type = REQ_QUIT;
118
119			send_req (req);
120			}
121
122			static void
123			read_write (pTHX_
124			int dowrite, int fd, off_t offset, size_t length,
125			SV data, STRLEN dataoffset, SV callback)
126			{
127			aio_req req;
128			STRLEN svlen;
129			char *svptr = SvPV (data, svlen);
130
131			SvUPGRADE (data, SVt_PV);
132			SvPOK_on (data);
133
134			if (dataoffset < 0)
135			dataoffset += svlen;
136
137			if (dataoffset < 0 \|\| dataoffset > svlen)
138			croak ("data offset outside of string");
139
140			if (dowrite)
141			{
142			/* write: check length and adjust. */
143			if (length < 0 \|\| length + dataoffset > svlen)
144			length = svlen - dataoffset;
145			}
146			else
147			{
148			/* read: grow scalar as necessary */
149			svptr = SvGROW (data, length + dataoffset);
150			}
151
152			if (length < 0)
153			croak ("length must not be negative");
154
155			Newz (0, req, 1, aio_cb);
156
157			if (!req)
158			croak ("out of memory during aio_req allocation");
159
160			req->type = dowrite ? REQ_WRITE : REQ_READ;
161			req->fd = fd;
162			req->offset = offset;
163			req->length = length;
164			req->data = SvREFCNT_inc (data);
165			req->dataptr = (char *)svptr + dataoffset;
166			req->callback = SvREFCNT_inc (callback);
167
168			send_req (req);
169			}
170
171			static void
172			poll_wait ()
173			{
174	root	1.3	if (!nreqs)
175			return;
176
177	root	1.1	fd_set rfd;
178			FD_ZERO(&rfd);
179	root	1.3	FD_SET(respipe [0], &rfd);
180	root	1.1
181	root	1.3	select (respipe [0] + 1, &rfd, 0, 0, 0);
182	root	1.1	}
183
184			static int
185			poll_cb (pTHX)
186			{
187			dSP;
188			int count = 0;
189			aio_req req;
190	root	1.3
191			{
192			/* read and signals sent by the worker threads */
193			char buf [32];
194			while (read (respipe [0], buf, 32) > 0)
195			;
196			}
197	root	1.1
198	root	1.3	for (;;)
199	root	1.1	{
200	root	1.3	pthread_mutex_lock (&reslock);
201
202			req = ress;
203
204			if (ress)
205			{
206			ress = ress->next;
207			if (!ress) rese = 0;
208			}
209
210			pthread_mutex_unlock (&reslock);
211
212			if (!req)
213			break;
214
215	root	1.1	nreqs--;
216
217			if (req->type == REQ_QUIT)
218			started--;
219			else
220			{
221			int errorno = errno;
222			errno = req->errorno;
223
224			if (req->type == REQ_READ)
225			SvCUR_set (req->data, req->dataoffset
226			+ req->result > 0 ? req->result : 0);
227
228			if (req->data)
229			SvREFCNT_dec (req->data);
230
231			if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
232			{
233			PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
234			PL_laststatval = req->result;
235			PL_statcache = *(req->statdata);
236
237			Safefree (req->statdata);
238			}
239
240			PUSHMARK (SP);
241			XPUSHs (sv_2mortal (newSViv (req->result)));
242	root	1.2
243			if (req->type == REQ_OPEN)
244			{
245			/* convert fd to fh */
246			SV *fh;
247
248			PUTBACK;
249			call_pv ("IO::AIO::_fd2fh", G_SCALAR \| G_EVAL);
250			SPAGAIN;
251
252			fh = POPs;
253
254			PUSHMARK (SP);
255			XPUSHs (fh);
256			}
257
258	root	1.1	PUTBACK;
259	root	1.2	call_sv (req->callback, G_VOID \| G_EVAL);
260	root	1.1	SPAGAIN;
261
262			if (req->callback)
263			SvREFCNT_dec (req->callback);
264
265			errno = errorno;
266			count++;
267			}
268
269			Safefree (req);
270			}
271
272			return count;
273			}
274
275			static void *
276			aio_proc (void *thr_arg)
277			{
278			aio_req req;
279	root	1.3	int type;
280	root	1.1
281	root	1.3	do
282	root	1.1	{
283	root	1.3	pthread_mutex_lock (&reqlock);
284
285			for (;;)
286			{
287			req = reqs;
288
289			if (reqs)
290			{
291			reqs = reqs->next;
292			if (!reqs) reqe = 0;
293			}
294
295			if (req)
296			break;
297
298			pthread_cond_wait (&reqwait, &reqlock);
299			}
300
301			pthread_mutex_unlock (&reqlock);
302
303	root	1.1	errno = 0; /* strictly unnecessary */
304
305	root	1.3	type = req->type;
306
307			switch (type)
308	root	1.1	{
309			case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;
310			case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;
311			#if SYS_readahead
312			case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
313			#else
314			case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
315			#endif
316
317			case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
318			case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
319			case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
320
321			case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
322			case REQ_CLOSE: req->result = close (req->fd); break;
323			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
324
325			case REQ_FSYNC: req->result = fsync (req->fd); break;
326			case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
327
328			case REQ_QUIT:
329	root	1.3	break;
330	root	1.1
331			default:
332			req->result = ENOSYS;
333			break;
334			}
335
336			req->errorno = errno;
337	root	1.3
338			pthread_mutex_lock (&reslock);
339
340			req->next = 0;
341
342			if (rese)
343			{
344			rese->next = req;
345			rese = req;
346			}
347			else
348			{
349			rese = ress = req;
350
351			/* write a dummy byte to the pipe so fh becomes ready */
352			write (respipe [1], &respipe, 1);
353			}
354
355			pthread_mutex_unlock (&reslock);
356	root	1.1	}
357	root	1.3	while (type != REQ_QUIT);
358	root	1.1
359			return 0;
360			}
361
362			MODULE = IO::AIO PACKAGE = IO::AIO
363
364			BOOT:
365			{
366	root	1.3	if (pipe (respipe))
367			croak ("unable to initialize result pipe");
368	root	1.1
369	root	1.3	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
370	root	1.1	croak ("cannot set result pipe to nonblocking mode");
371
372	root	1.3	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
373	root	1.1	croak ("cannot set result pipe to nonblocking mode");
374			}
375
376			void
377			min_parallel(nthreads)
378			int nthreads
379			PROTOTYPE: $
380			CODE:
381			while (nthreads > started)
382			start_thread ();
383
384			void
385			max_parallel(nthreads)
386			int nthreads
387			PROTOTYPE: $
388			CODE:
389			{
390			int cur = started;
391			while (cur > nthreads)
392			{
393			end_thread ();
394			cur--;
395			}
396
397			while (started > nthreads)
398			{
399			poll_wait ();
400			poll_cb (aTHX);
401			}
402			}
403
404			void
405			aio_open(pathname,flags,mode,callback)
406			SV * pathname
407			int flags
408			int mode
409			SV * callback
410			PROTOTYPE: $$$$
411			CODE:
412			{
413			aio_req req;
414
415			Newz (0, req, 1, aio_cb);
416
417			if (!req)
418			croak ("out of memory during aio_req allocation");
419
420			req->type = REQ_OPEN;
421			req->data = newSVsv (pathname);
422			req->dataptr = SvPV_nolen (req->data);
423			req->fd = flags;
424			req->mode = mode;
425			req->callback = SvREFCNT_inc (callback);
426
427			send_req (req);
428			}
429
430			void
431			aio_close(fh,callback)
432			InputStream fh
433			SV * callback
434			PROTOTYPE: $$
435			ALIAS:
436			aio_close = REQ_CLOSE
437			aio_fsync = REQ_FSYNC
438			aio_fdatasync = REQ_FDATASYNC
439			CODE:
440			{
441			aio_req req;
442
443			Newz (0, req, 1, aio_cb);
444
445			if (!req)
446			croak ("out of memory during aio_req allocation");
447
448			req->type = ix;
449			req->fd = PerlIO_fileno (fh);
450			req->callback = SvREFCNT_inc (callback);
451
452			send_req (req);
453			}
454
455			void
456			aio_read(fh,offset,length,data,dataoffset,callback)
457			InputStream fh
458			UV offset
459			IV length
460			SV * data
461			IV dataoffset
462			SV * callback
463			PROTOTYPE: $$$$$$
464			CODE:
465			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
466
467			void
468			aio_write(fh,offset,length,data,dataoffset,callback)
469			OutputStream fh
470			UV offset
471			IV length
472			SV * data
473			IV dataoffset
474			SV * callback
475			PROTOTYPE: $$$$$$
476			CODE:
477			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
478
479			void
480			aio_readahead(fh,offset,length,callback)
481			InputStream fh
482			UV offset
483			IV length
484			SV * callback
485			PROTOTYPE: $$$$
486			CODE:
487			{
488			aio_req req;
489
490			if (length < 0)
491			croak ("length must not be negative");
492
493			Newz (0, req, 1, aio_cb);
494
495			if (!req)
496			croak ("out of memory during aio_req allocation");
497
498			req->type = REQ_READAHEAD;
499			req->fd = PerlIO_fileno (fh);
500			req->offset = offset;
501			req->length = length;
502			req->callback = SvREFCNT_inc (callback);
503
504			send_req (req);
505			}
506
507			void
508			aio_stat(fh_or_path,callback)
509			SV * fh_or_path
510			SV * callback
511			PROTOTYPE: $$
512			ALIAS:
513			aio_lstat = 1
514			CODE:
515			{
516			aio_req req;
517
518			Newz (0, req, 1, aio_cb);
519
520			if (!req)
521			croak ("out of memory during aio_req allocation");
522
523			New (0, req->statdata, 1, Stat_t);
524
525			if (!req->statdata)
526			croak ("out of memory during aio_req->statdata allocation");
527
528			if (SvPOK (fh_or_path))
529			{
530			req->type = ix ? REQ_LSTAT : REQ_STAT;
531			req->data = newSVsv (fh_or_path);
532			req->dataptr = SvPV_nolen (req->data);
533			}
534			else
535			{
536			req->type = REQ_FSTAT;
537			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
538			}
539
540			req->callback = SvREFCNT_inc (callback);
541
542			send_req (req);
543			}
544
545			void
546			aio_unlink(pathname,callback)
547			SV * pathname
548			SV * callback
549			PROTOTYPE: $$
550			CODE:
551			{
552			aio_req req;
553
554			Newz (0, req, 1, aio_cb);
555
556			if (!req)
557			croak ("out of memory during aio_req allocation");
558
559			req->type = REQ_UNLINK;
560			req->data = newSVsv (pathname);
561			req->dataptr = SvPV_nolen (req->data);
562			req->callback = SvREFCNT_inc (callback);
563
564			send_req (req);
565			}
566
567			int
568			poll_fileno()
569			PROTOTYPE:
570			CODE:
571	root	1.3	RETVAL = respipe [0];
572	root	1.1	OUTPUT:
573			RETVAL
574
575			int
576			poll_cb(...)
577			PROTOTYPE:
578			CODE:
579			RETVAL = poll_cb (aTHX);
580			OUTPUT:
581			RETVAL
582
583			void
584			poll_wait()
585			PROTOTYPE:
586			CODE:
587	root	1.3	if (nreqs)
588			poll_wait ();
589	root	1.1
590			int
591			nreqs()
592			PROTOTYPE:
593			CODE:
594			RETVAL = nreqs;
595			OUTPUT:
596			RETVAL
597