IO-AIO/AIO.xs

#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 <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 __ia64
# define STACKSIZE 65536
#else
# define STACKSIZE  4096
#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 max_outstanding = 1<<30;
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
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 ()
{
  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);
            }

          if (SvOK (req->callback))
            {
              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 *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);

  while (nreqs > max_outstanding)
    {
      poll_wait ();
      poll_cb ();
    }
}

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 (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 *
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

PROTOTYPES: ENABLE

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 ();
          }
}

int
max_outstanding(nreqs)
        int nreqs
        PROTOTYPE: $
        CODE:
        RETVAL = max_outstanding;
        max_outstanding = nreqs;

void
aio_open(pathname,flags,mode,callback=&PL_sv_undef)
        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=&PL_sv_undef)
        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=&PL_sv_undef)
        InputStream     fh
        UV              offset
        IV              length
        SV *            data
        IV              dataoffset
        SV *            callback
        PROTOTYPE: $$$$$;$
        CODE:
        read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);

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

void
aio_readahead(fh,offset,length,callback=&PL_sv_undef)
        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=&PL_sv_undef)
        SV *            fh_or_path
        SV *            callback
        ALIAS:
           aio_stat  = REQ_STAT
           aio_lstat = REQ_LSTAT
        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->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=&PL_sv_undef)
        SV * pathname
        SV * callback
        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);
}

void
flush()
        PROTOTYPE:
        CODE:
        while (nreqs)
          {
            poll_wait ();
            poll_cb ();
          }

void
poll()
        PROTOTYPE:
        CODE:
        if (nreqs)
          {
            poll_wait ();
            poll_cb ();
          }

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

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

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

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

Revision:	1.9
Committed:	Tue Jul 12 11:02:54 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_5
Changes since 1.8:	+0 -1 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#include "EXTERN.h"
2			#include "perl.h"
3			#include "XSUB.h"
4
5			#include <sys/types.h>
6			#include <sys/stat.h>
7			#include <unistd.h>
8			#include <fcntl.h>
9			#include <signal.h>
10			#include <sched.h>
11
12			#include <pthread.h>
13			#include <sys/syscall.h>
14
15			typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
16			typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
17			typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
18
19	root	1.4	#if __ia64
20			# define STACKSIZE 65536
21	root	1.1	#else
22	root	1.4	# define STACKSIZE 4096
23	root	1.1	#endif
24
25			enum {
26			REQ_QUIT,
27			REQ_OPEN, REQ_CLOSE,
28			REQ_READ, REQ_WRITE, REQ_READAHEAD,
29			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
30			REQ_FSYNC, REQ_FDATASYNC,
31			};
32
33			typedef struct aio_cb {
34	root	1.3	struct aio_cb *volatile next;
35	root	1.1
36			int type;
37
38			int fd;
39			off_t offset;
40			size_t length;
41			ssize_t result;
42			mode_t mode; /* open */
43			int errorno;
44			SV data, callback;
45			void *dataptr;
46			STRLEN dataoffset;
47
48			Stat_t *statdata;
49			} aio_cb;
50
51			typedef aio_cb *aio_req;
52
53			static int started;
54			static int nreqs;
55	root	1.4	static int max_outstanding = 1<<30;
56	root	1.3	static int respipe [2];
57	root	1.1
58	root	1.3	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
59			static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
60			static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
61
62			static volatile aio_req reqs, reqe; /* queue start, queue end */
63			static volatile aio_req ress, rese; /* queue start, queue end */
64	root	1.1
65			static void
66			poll_wait ()
67			{
68	root	1.3	if (!nreqs)
69			return;
70
71	root	1.1	fd_set rfd;
72			FD_ZERO(&rfd);
73	root	1.3	FD_SET(respipe [0], &rfd);
74	root	1.1
75	root	1.3	select (respipe [0] + 1, &rfd, 0, 0, 0);
76	root	1.1	}
77
78			static int
79	root	1.5	poll_cb ()
80	root	1.1	{
81			dSP;
82			int count = 0;
83			aio_req req;
84	root	1.3
85			{
86			/* read and signals sent by the worker threads */
87			char buf [32];
88			while (read (respipe [0], buf, 32) > 0)
89			;
90			}
91	root	1.1
92	root	1.3	for (;;)
93	root	1.1	{
94	root	1.3	pthread_mutex_lock (&reslock);
95
96			req = ress;
97
98			if (ress)
99			{
100			ress = ress->next;
101			if (!ress) rese = 0;
102			}
103
104			pthread_mutex_unlock (&reslock);
105
106			if (!req)
107			break;
108
109	root	1.1	nreqs--;
110
111			if (req->type == REQ_QUIT)
112			started--;
113			else
114			{
115			int errorno = errno;
116			errno = req->errorno;
117
118			if (req->type == REQ_READ)
119			SvCUR_set (req->data, req->dataoffset
120			+ req->result > 0 ? req->result : 0);
121
122			if (req->data)
123			SvREFCNT_dec (req->data);
124
125			if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
126			{
127			PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
128			PL_laststatval = req->result;
129			PL_statcache = *(req->statdata);
130
131			Safefree (req->statdata);
132			}
133
134			PUSHMARK (SP);
135			XPUSHs (sv_2mortal (newSViv (req->result)));
136	root	1.2
137			if (req->type == REQ_OPEN)
138			{
139			/* convert fd to fh */
140			SV *fh;
141
142			PUTBACK;
143			call_pv ("IO::AIO::_fd2fh", G_SCALAR \| G_EVAL);
144			SPAGAIN;
145
146			fh = POPs;
147
148			PUSHMARK (SP);
149			XPUSHs (fh);
150			}
151
152	root	1.8	if (SvOK (req->callback))
153			{
154			PUTBACK;
155			call_sv (req->callback, G_VOID \| G_EVAL);
156			SPAGAIN;
157			}
158	root	1.1
159			if (req->callback)
160			SvREFCNT_dec (req->callback);
161
162			errno = errorno;
163			count++;
164			}
165
166			Safefree (req);
167			}
168
169			return count;
170			}
171
172	root	1.4	static void aio_proc(void arg);
173
174			static void
175			start_thread (void)
176			{
177			sigset_t fullsigset, oldsigset;
178			pthread_t tid;
179			pthread_attr_t attr;
180
181			pthread_attr_init (&attr);
182			pthread_attr_setstacksize (&attr, STACKSIZE);
183			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
184
185			sigfillset (&fullsigset);
186			sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
187
188			if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
189			started++;
190
191			sigprocmask (SIG_SETMASK, &oldsigset, 0);
192			}
193
194			static void
195			send_req (aio_req req)
196			{
197			nreqs++;
198
199			pthread_mutex_lock (&reqlock);
200
201			req->next = 0;
202
203			if (reqe)
204			{
205			reqe->next = req;
206			reqe = req;
207			}
208			else
209			reqe = reqs = req;
210
211			pthread_cond_signal (&reqwait);
212			pthread_mutex_unlock (&reqlock);
213
214			while (nreqs > max_outstanding)
215			{
216			poll_wait ();
217			poll_cb ();
218			}
219			}
220
221			static void
222			end_thread (void)
223			{
224			aio_req req;
225			New (0, req, 1, aio_cb);
226			req->type = REQ_QUIT;
227
228			send_req (req);
229			}
230
231			static void
232	root	1.5	read_write (int dowrite, int fd, off_t offset, size_t length,
233	root	1.4	SV data, STRLEN dataoffset, SV callback)
234			{
235			aio_req req;
236			STRLEN svlen;
237			char *svptr = SvPV (data, svlen);
238
239			SvUPGRADE (data, SVt_PV);
240			SvPOK_on (data);
241
242			if (dataoffset < 0)
243			dataoffset += svlen;
244
245			if (dataoffset < 0 \|\| dataoffset > svlen)
246			croak ("data offset outside of string");
247
248			if (dowrite)
249			{
250			/* write: check length and adjust. */
251			if (length < 0 \|\| length + dataoffset > svlen)
252			length = svlen - dataoffset;
253			}
254			else
255			{
256			/* read: grow scalar as necessary */
257			svptr = SvGROW (data, length + dataoffset);
258			}
259
260			if (length < 0)
261			croak ("length must not be negative");
262
263			Newz (0, req, 1, aio_cb);
264
265			if (!req)
266			croak ("out of memory during aio_req allocation");
267
268			req->type = dowrite ? REQ_WRITE : REQ_READ;
269			req->fd = fd;
270			req->offset = offset;
271			req->length = length;
272			req->data = SvREFCNT_inc (data);
273			req->dataptr = (char *)svptr + dataoffset;
274			req->callback = SvREFCNT_inc (callback);
275
276			send_req (req);
277			}
278
279	root	1.1	static void *
280			aio_proc (void *thr_arg)
281			{
282			aio_req req;
283	root	1.3	int type;
284	root	1.1
285	root	1.3	do
286	root	1.1	{
287	root	1.3	pthread_mutex_lock (&reqlock);
288
289			for (;;)
290			{
291			req = reqs;
292
293			if (reqs)
294			{
295			reqs = reqs->next;
296			if (!reqs) reqe = 0;
297			}
298
299			if (req)
300			break;
301
302			pthread_cond_wait (&reqwait, &reqlock);
303			}
304
305			pthread_mutex_unlock (&reqlock);
306
307	root	1.1	errno = 0; /* strictly unnecessary */
308
309	root	1.3	type = req->type;
310
311			switch (type)
312	root	1.1	{
313			case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;
314			case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;
315			#if SYS_readahead
316			case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
317			#else
318			case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
319			#endif
320
321			case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
322			case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
323			case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
324
325			case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
326			case REQ_CLOSE: req->result = close (req->fd); break;
327			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
328
329			case REQ_FSYNC: req->result = fsync (req->fd); break;
330			case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
331
332			case REQ_QUIT:
333	root	1.3	break;
334	root	1.1
335			default:
336			req->result = ENOSYS;
337			break;
338			}
339
340			req->errorno = errno;
341	root	1.3
342			pthread_mutex_lock (&reslock);
343
344			req->next = 0;
345
346			if (rese)
347			{
348			rese->next = req;
349			rese = req;
350			}
351			else
352			{
353			rese = ress = req;
354
355			/* write a dummy byte to the pipe so fh becomes ready */
356			write (respipe [1], &respipe, 1);
357			}
358
359			pthread_mutex_unlock (&reslock);
360	root	1.1	}
361	root	1.3	while (type != REQ_QUIT);
362	root	1.1
363			return 0;
364			}
365
366			MODULE = IO::AIO PACKAGE = IO::AIO
367
368	root	1.8	PROTOTYPES: ENABLE
369
370	root	1.1	BOOT:
371			{
372	root	1.3	if (pipe (respipe))
373			croak ("unable to initialize result pipe");
374	root	1.1
375	root	1.3	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
376	root	1.1	croak ("cannot set result pipe to nonblocking mode");
377
378	root	1.3	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
379	root	1.1	croak ("cannot set result pipe to nonblocking mode");
380			}
381
382			void
383			min_parallel(nthreads)
384			int nthreads
385			PROTOTYPE: $
386			CODE:
387			while (nthreads > started)
388			start_thread ();
389
390			void
391			max_parallel(nthreads)
392			int nthreads
393			PROTOTYPE: $
394			CODE:
395			{
396			int cur = started;
397			while (cur > nthreads)
398			{
399			end_thread ();
400			cur--;
401			}
402
403			while (started > nthreads)
404			{
405			poll_wait ();
406	root	1.5	poll_cb ();
407	root	1.1	}
408			}
409
410	root	1.4	int
411			max_outstanding(nreqs)
412			int nreqs
413			PROTOTYPE: $
414			CODE:
415			RETVAL = max_outstanding;
416			max_outstanding = nreqs;
417
418	root	1.1	void
419	root	1.8	aio_open(pathname,flags,mode,callback=&PL_sv_undef)
420	root	1.1	SV * pathname
421			int flags
422			int mode
423			SV * callback
424	root	1.8	PROTOTYPE: $$$;$
425	root	1.1	CODE:
426			{
427			aio_req req;
428
429			Newz (0, req, 1, aio_cb);
430
431			if (!req)
432			croak ("out of memory during aio_req allocation");
433
434			req->type = REQ_OPEN;
435			req->data = newSVsv (pathname);
436			req->dataptr = SvPV_nolen (req->data);
437			req->fd = flags;
438			req->mode = mode;
439			req->callback = SvREFCNT_inc (callback);
440
441			send_req (req);
442			}
443
444			void
445	root	1.8	aio_close(fh,callback=&PL_sv_undef)
446	root	1.1	InputStream fh
447			SV * callback
448	root	1.8	PROTOTYPE: $;$
449	root	1.1	ALIAS:
450			aio_close = REQ_CLOSE
451			aio_fsync = REQ_FSYNC
452			aio_fdatasync = REQ_FDATASYNC
453			CODE:
454			{
455			aio_req req;
456
457			Newz (0, req, 1, aio_cb);
458
459			if (!req)
460			croak ("out of memory during aio_req allocation");
461
462			req->type = ix;
463			req->fd = PerlIO_fileno (fh);
464			req->callback = SvREFCNT_inc (callback);
465
466			send_req (req);
467			}
468
469			void
470	root	1.8	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
471	root	1.1	InputStream fh
472			UV offset
473			IV length
474			SV * data
475			IV dataoffset
476			SV * callback
477	root	1.8	PROTOTYPE: $$$$$;$
478	root	1.1	CODE:
479	root	1.5	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
480	root	1.1
481			void
482	root	1.8	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
483	root	1.1	OutputStream fh
484			UV offset
485			IV length
486			SV * data
487			IV dataoffset
488			SV * callback
489	root	1.8	PROTOTYPE: $$$$$;$
490	root	1.1	CODE:
491	root	1.5	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
492	root	1.1
493			void
494	root	1.8	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
495	root	1.1	InputStream fh
496			UV offset
497			IV length
498			SV * callback
499	root	1.8	PROTOTYPE: $$$;$
500	root	1.1	CODE:
501			{
502			aio_req req;
503
504			if (length < 0)
505			croak ("length must not be negative");
506
507			Newz (0, req, 1, aio_cb);
508
509			if (!req)
510			croak ("out of memory during aio_req allocation");
511
512			req->type = REQ_READAHEAD;
513			req->fd = PerlIO_fileno (fh);
514			req->offset = offset;
515			req->length = length;
516			req->callback = SvREFCNT_inc (callback);
517
518			send_req (req);
519			}
520
521			void
522	root	1.8	aio_stat(fh_or_path,callback=&PL_sv_undef)
523	root	1.1	SV * fh_or_path
524			SV * callback
525			ALIAS:
526	root	1.8	aio_stat = REQ_STAT
527			aio_lstat = REQ_LSTAT
528	root	1.1	CODE:
529			{
530			aio_req req;
531
532			Newz (0, req, 1, aio_cb);
533
534			if (!req)
535			croak ("out of memory during aio_req allocation");
536
537			New (0, req->statdata, 1, Stat_t);
538
539			if (!req->statdata)
540			croak ("out of memory during aio_req->statdata allocation");
541
542			if (SvPOK (fh_or_path))
543			{
544	root	1.8	req->type = ix;
545	root	1.1	req->data = newSVsv (fh_or_path);
546			req->dataptr = SvPV_nolen (req->data);
547			}
548			else
549			{
550			req->type = REQ_FSTAT;
551			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
552			}
553
554			req->callback = SvREFCNT_inc (callback);
555
556			send_req (req);
557			}
558
559			void
560	root	1.8	aio_unlink(pathname,callback=&PL_sv_undef)
561	root	1.1	SV * pathname
562			SV * callback
563			CODE:
564			{
565			aio_req req;
566
567			Newz (0, req, 1, aio_cb);
568
569			if (!req)
570			croak ("out of memory during aio_req allocation");
571
572			req->type = REQ_UNLINK;
573			req->data = newSVsv (pathname);
574			req->dataptr = SvPV_nolen (req->data);
575			req->callback = SvREFCNT_inc (callback);
576
577			send_req (req);
578			}
579
580	root	1.6	void
581			flush()
582			PROTOTYPE:
583			CODE:
584			while (nreqs)
585			{
586			poll_wait ();
587			poll_cb ();
588			}
589
590	root	1.7	void
591			poll()
592			PROTOTYPE:
593			CODE:
594			if (nreqs)
595			{
596			poll_wait ();
597			poll_cb ();
598			}
599
600	root	1.1	int
601			poll_fileno()
602			PROTOTYPE:
603			CODE:
604	root	1.3	RETVAL = respipe [0];
605	root	1.1	OUTPUT:
606			RETVAL
607
608			int
609			poll_cb(...)
610			PROTOTYPE:
611			CODE:
612	root	1.5	RETVAL = poll_cb ();
613	root	1.1	OUTPUT:
614			RETVAL
615
616			void
617			poll_wait()
618			PROTOTYPE:
619			CODE:
620	root	1.3	if (nreqs)
621			poll_wait ();
622	root	1.1
623			int
624			nreqs()
625			PROTOTYPE:
626			CODE:
627			RETVAL = nreqs;
628			OUTPUT:
629			RETVAL
630