Linux-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>

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 ;) */

#define STACKSIZE 1024 /* yeah */

enum { REQ_QUIT, REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, REQ_STAT, REQ_LSTAT, REQ_FSTAT};

typedef struct {
  char stack[STACKSIZE];
} aio_thread;

typedef struct {
  int type;
  aio_thread *thread;

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

  struct stat64 *statdata;
} aio_cb;

typedef aio_cb *aio_req;

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

static int aio_proc(void *arg);

static void
start_thread(void)
{
  aio_thread *thr;

  New (0, thr, 1, aio_thread);

  if (clone (aio_proc,
             &(thr->stack[STACKSIZE]),
             CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND,
             thr) >= 0)
    started++;
  else
    Safefree (thr);
}

static void
end_thread(void)
{
  aio_req req;
  New (0, req, 1, aio_cb);
  req->type = REQ_QUIT;
  write (reqpipe[1], &req, sizeof (aio_req));
}

static void
send_req (aio_req req)
{
  nreqs++;
  write (reqpipe[1], &req, sizeof (aio_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 int
poll_cb (pTHX)
{
  dSP;
  int count = 0;
  aio_req req;

  while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
    {
      if (req->type == REQ_QUIT)
        {
          Safefree (req->thread);
          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.st_dev     = req->statdata->st_dev;
              PL_statcache.st_ino     = req->statdata->st_ino;
              PL_statcache.st_mode    = req->statdata->st_mode;
              PL_statcache.st_nlink   = req->statdata->st_nlink;
              PL_statcache.st_uid     = req->statdata->st_uid;
              PL_statcache.st_gid     = req->statdata->st_gid;
              PL_statcache.st_rdev    = req->statdata->st_rdev;
              PL_statcache.st_size    = req->statdata->st_size;
              PL_statcache.st_atime   = req->statdata->st_atime;
              PL_statcache.st_mtime   = req->statdata->st_mtime;
              PL_statcache.st_ctime   = req->statdata->st_ctime;
              PL_statcache.st_blksize = req->statdata->st_blksize;
              PL_statcache.st_blocks  = req->statdata->st_blocks;

              Safefree (req->statdata);
            }

          PUSHMARK (SP);
          XPUSHs (sv_2mortal (newSViv (req->result)));
          PUTBACK;
          call_sv (req->callback, G_VOID);
          SPAGAIN;
          
          if (req->callback)
            SvREFCNT_dec (req->callback);

          errno = errorno;
          nreqs--;
          count++;
        }

      Safefree (req);
    }

  return count;
}

static sigset_t fullsigset;

#undef errno
#include <asm/unistd.h>

static int
aio_proc(void *thr_arg)
{
  aio_thread *thr = thr_arg;
  aio_req req;
  int errno;

  /* we rely on gcc's ability to create closures. */
  _syscall3(int,read,int,fd,char *,buf,size_t,count)
  _syscall3(int,write,int,fd,char *,buf,size_t,count)

  _syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
  _syscall1(int,close,int,fd)

  _syscall4(int,pread,int,fd,char *,buf,size_t,count,off_t,offset)
  _syscall4(int,pwrite,int,fd,char *,buf,size_t,count,off_t,offset)

  _syscall2(int,stat64, const char *, filename, struct stat64 *, buf)
  _syscall2(int,lstat64, const char *, filename, struct stat64 *, buf)
  _syscall2(int,fstat64, int, fd, struct stat64 *, buf)

  sigprocmask (SIG_SETMASK, &fullsigset, 0);

  /* then loop */
  while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
    {
      req->thread = thr;
      errno = 0; /* strictly unnecessary */

      if (req->type == REQ_READ)
        req->result = pread (req->fd, req->dataptr, req->length, req->offset);
      else if (req->type == REQ_WRITE)
        req->result = pwrite (req->fd, req->dataptr, req->length, req->offset);
      else if (req->type == REQ_OPEN)
        req->result = open (req->dataptr, req->fd, req->mode);
      else if (req->type == REQ_CLOSE)
        req->result = close (req->fd);
      else if (req->type == REQ_STAT)
        req->result = stat64 (req->dataptr, req->statdata);
      else if (req->type == REQ_LSTAT)
        req->result = lstat64 (req->dataptr, req->statdata);
      else if (req->type == REQ_FSTAT)
        req->result = fstat64 (req->fd, req->statdata);
      else
        {
          write (respipe[1], (void *)&req, sizeof (req));
          break;
        }

      req->errorno = errno;
      write (respipe[1], (void *)&req, sizeof (req));
    }

  return 0;
}

MODULE = Linux::AIO                PACKAGE = Linux::AIO

BOOT:
{
        sigfillset (&fullsigset);
        sigdelset (&fullsigset, SIGTERM);
        sigdelset (&fullsigset, SIGQUIT);
        sigdelset (&fullsigset, SIGABRT);
        sigdelset (&fullsigset, SIGINT);

        if (pipe (reqpipe) || pipe (respipe))
          croak ("unable to initialize request or result pipe");

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

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

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: $$
        CODE:
        aio_req req;

        Newz (0, req, 1, aio_cb);

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

        req->type = REQ_CLOSE;
        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_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, struct stat64);

        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);

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

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

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

Revision:	1.14
Committed:	Tue Apr 2 14:01:09 2002 UTC (22 years, 1 month ago) by root
Branch:	MAIN
Changes since 1.13:	+20 -21 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	root	1.13	#include <sys/stat.h>
7	root	1.1	#include <unistd.h>
8	root	1.5	#include <fcntl.h>
9	root	1.8	#include <signal.h>
10	root	1.1	#include <sched.h>
11
12	root	1.13	typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
13			typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
14	root	1.12	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
15
16	root	1.8	#define STACKSIZE 1024 /* yeah */
17	root	1.1
18	root	1.13	enum { REQ_QUIT, REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, REQ_STAT, REQ_LSTAT, REQ_FSTAT};
19	root	1.1
20			typedef struct {
21			char stack[STACKSIZE];
22			} aio_thread;
23
24			typedef struct {
25			int type;
26			aio_thread *thread;
27
28			int fd;
29			off_t offset;
30			size_t length;
31	root	1.2	ssize_t result;
32	root	1.8	mode_t mode; /* open */
33	root	1.1	int errorno;
34	root	1.5	SV data, callback;
35	root	1.1	void *dataptr;
36	root	1.2	STRLEN dataoffset;
37	root	1.13
38			struct stat64 *statdata;
39	root	1.1	} aio_cb;
40
41			typedef aio_cb *aio_req;
42
43			static int started;
44	root	1.5	static int nreqs;
45	root	1.1	static int reqpipe[2], respipe[2];
46
47	root	1.2	static int aio_proc(void *arg);
48
49	root	1.1	static void
50			start_thread(void)
51			{
52	root	1.2	aio_thread *thr;
53
54			New (0, thr, 1, aio_thread);
55
56			if (clone (aio_proc,
57			&(thr->stack[STACKSIZE]),
58			CLONE_VM\|CLONE_FS\|CLONE_FILES\|CLONE_SIGHAND,
59			thr) >= 0)
60			started++;
61			else
62			Safefree (thr);
63	root	1.1	}
64
65			static void
66			end_thread(void)
67			{
68	root	1.5	aio_req req;
69			New (0, req, 1, aio_cb);
70			req->type = REQ_QUIT;
71	root	1.1	write (reqpipe[1], &req, sizeof (aio_req));
72	root	1.2	}
73
74			static void
75	root	1.8	send_req (aio_req req)
76			{
77			nreqs++;
78			write (reqpipe[1], &req, sizeof (aio_req));
79			}
80
81			static void
82	root	1.5	read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
83			SV data, STRLEN dataoffset, SVcallback)
84	root	1.2	{
85	root	1.5	aio_req req;
86			STRLEN svlen;
87			char *svptr = SvPV (data, svlen);
88
89	root	1.13	SvUPGRADE (data, SVt_PV);
90			SvPOK_on (data);
91
92	root	1.5	if (dataoffset < 0)
93			dataoffset += svlen;
94
95			if (dataoffset < 0 \|\| dataoffset > svlen)
96			croak ("data offset outside of string");
97
98			if (dowrite)
99			{
100			/* write: check length and adjust. */
101			if (length < 0 \|\| length + dataoffset > svlen)
102			length = svlen - dataoffset;
103			}
104			else
105			{
106			/* read: grow scalar as necessary */
107			svptr = SvGROW (data, length + dataoffset);
108			}
109
110			if (length < 0)
111			croak ("length must not be negative");
112
113	root	1.14	Newz (0, req, 1, aio_cb);
114	root	1.5
115			if (!req)
116			croak ("out of memory during aio_req allocation");
117
118			req->type = dowrite ? REQ_WRITE : REQ_READ;
119			req->fd = fd;
120			req->offset = offset;
121			req->length = length;
122			req->data = SvREFCNT_inc (data);
123	root	1.6	req->dataptr = (char *)svptr + dataoffset;
124	root	1.5	req->callback = SvREFCNT_inc (callback);
125
126	root	1.8	send_req (req);
127	root	1.5	}
128
129			static int
130			poll_cb (pTHX)
131			{
132			dSP;
133			int count = 0;
134			aio_req req;
135
136			while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
137			{
138			if (req->type == REQ_QUIT)
139			{
140			Safefree (req->thread);
141			started--;
142			}
143			else
144			{
145			int errorno = errno;
146			errno = req->errorno;
147
148			if (req->type == REQ_READ)
149	root	1.6	SvCUR_set (req->data, req->dataoffset
150			+ req->result > 0 ? req->result : 0);
151	root	1.5
152	root	1.14	if (req->data)
153			SvREFCNT_dec (req->data);
154
155	root	1.13	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
156			{
157			PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
158			PL_laststatval = req->result;
159			PL_statcache.st_dev = req->statdata->st_dev;
160			PL_statcache.st_ino = req->statdata->st_ino;
161			PL_statcache.st_mode = req->statdata->st_mode;
162			PL_statcache.st_nlink = req->statdata->st_nlink;
163			PL_statcache.st_uid = req->statdata->st_uid;
164			PL_statcache.st_gid = req->statdata->st_gid;
165			PL_statcache.st_rdev = req->statdata->st_rdev;
166			PL_statcache.st_size = req->statdata->st_size;
167			PL_statcache.st_atime = req->statdata->st_atime;
168			PL_statcache.st_mtime = req->statdata->st_mtime;
169			PL_statcache.st_ctime = req->statdata->st_ctime;
170			PL_statcache.st_blksize = req->statdata->st_blksize;
171			PL_statcache.st_blocks = req->statdata->st_blocks;
172
173			Safefree (req->statdata);
174			}
175
176	root	1.5	PUSHMARK (SP);
177			XPUSHs (sv_2mortal (newSViv (req->result)));
178			PUTBACK;
179			call_sv (req->callback, G_VOID);
180			SPAGAIN;
181
182	root	1.14	if (req->callback)
183			SvREFCNT_dec (req->callback);
184	root	1.5
185			errno = errorno;
186			nreqs--;
187			count++;
188			}
189
190			Safefree (req);
191			}
192
193			return count;
194	root	1.2	}
195
196	root	1.8	static sigset_t fullsigset;
197
198	root	1.2	#undef errno
199			#include <asm/unistd.h>
200
201			static int
202			aio_proc(void *thr_arg)
203			{
204			aio_thread *thr = thr_arg;
205	root	1.9	aio_req req;
206	root	1.2	int errno;
207
208	root	1.11	/* we rely on gcc's ability to create closures. */
209	root	1.13	_syscall3(int,read,int,fd,char *,buf,size_t,count)
210			_syscall3(int,write,int,fd,char *,buf,size_t,count)
211
212	root	1.11	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
213			_syscall1(int,close,int,fd)
214
215	root	1.13	_syscall4(int,pread,int,fd,char *,buf,size_t,count,off_t,offset)
216			_syscall4(int,pwrite,int,fd,char *,buf,size_t,count,off_t,offset)
217
218			_syscall2(int,stat64, const char , filename, struct stat64 , buf)
219			_syscall2(int,lstat64, const char , filename, struct stat64 , buf)
220			_syscall2(int,fstat64, int, fd, struct stat64 *, buf)
221
222	root	1.8	sigprocmask (SIG_SETMASK, &fullsigset, 0);
223	root	1.2
224			/* then loop */
225			while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
226			{
227			req->thread = thr;
228	root	1.14	errno = 0; /* strictly unnecessary */
229	root	1.2
230	root	1.13	if (req->type == REQ_READ)
231			req->result = pread (req->fd, req->dataptr, req->length, req->offset);
232			else if (req->type == REQ_WRITE)
233			req->result = pwrite (req->fd, req->dataptr, req->length, req->offset);
234	root	1.8	else if (req->type == REQ_OPEN)
235	root	1.13	req->result = open (req->dataptr, req->fd, req->mode);
236	root	1.10	else if (req->type == REQ_CLOSE)
237	root	1.13	req->result = close (req->fd);
238			else if (req->type == REQ_STAT)
239			req->result = stat64 (req->dataptr, req->statdata);
240			else if (req->type == REQ_LSTAT)
241			req->result = lstat64 (req->dataptr, req->statdata);
242			else if (req->type == REQ_FSTAT)
243			req->result = fstat64 (req->fd, req->statdata);
244	root	1.2	else
245			{
246			write (respipe[1], (void *)&req, sizeof (req));
247			break;
248			}
249
250	root	1.8	req->errorno = errno;
251	root	1.2	write (respipe[1], (void *)&req, sizeof (req));
252			}
253
254			return 0;
255	root	1.1	}
256
257			MODULE = Linux::AIO PACKAGE = Linux::AIO
258
259			BOOT:
260			{
261	root	1.8	sigfillset (&fullsigset);
262	root	1.9	sigdelset (&fullsigset, SIGTERM);
263			sigdelset (&fullsigset, SIGQUIT);
264			sigdelset (&fullsigset, SIGABRT);
265			sigdelset (&fullsigset, SIGINT);
266	root	1.8
267	root	1.1	if (pipe (reqpipe) \|\| pipe (respipe))
268			croak ("unable to initialize request or result pipe");
269	root	1.5
270			if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
271			croak ("cannot set result pipe to nonblocking mode");
272	root	1.1	}
273
274			void
275			min_parallel(nthreads)
276			int nthreads
277	root	1.5	PROTOTYPE: $
278	root	1.1	CODE:
279			while (nthreads > started)
280			start_thread ();
281
282			void
283			max_parallel(nthreads)
284			int nthreads
285	root	1.5	PROTOTYPE: $
286	root	1.1	CODE:
287	root	1.5	int cur = started;
288			while (cur > nthreads)
289			{
290			end_thread ();
291			cur--;
292			}
293
294	root	1.1	while (started > nthreads)
295	root	1.5	{
296	root	1.14	fd_set rfd;
297			FD_ZERO(&rfd);
298			FD_SET(respipe[0], &rfd);
299
300			select (respipe[0] + 1, &rfd, 0, 0, 0);
301	root	1.5	poll_cb ();
302			}
303	root	1.1
304			void
305	root	1.8	aio_open(pathname,flags,mode,callback)
306	root	1.13	SV * pathname
307	root	1.8	int flags
308			int mode
309			SV * callback
310			PROTOTYPE: $$$$
311			CODE:
312			aio_req req;
313
314	root	1.14	Newz (0, req, 1, aio_cb);
315	root	1.8
316			if (!req)
317			croak ("out of memory during aio_req allocation");
318
319			req->type = REQ_OPEN;
320	root	1.14	req->data = newSVsv (pathname);
321			req->dataptr = SvPV_nolen (req->data);
322	root	1.8	req->fd = flags;
323			req->mode = mode;
324	root	1.10	req->callback = SvREFCNT_inc (callback);
325
326			send_req (req);
327
328			void
329			aio_close(fh,callback)
330	root	1.13	InputStream fh
331	root	1.10	SV * callback
332	root	1.14	PROTOTYPE: $$
333	root	1.10	CODE:
334			aio_req req;
335
336	root	1.14	Newz (0, req, 1, aio_cb);
337	root	1.10
338			if (!req)
339			croak ("out of memory during aio_req allocation");
340
341			req->type = REQ_CLOSE;
342			req->fd = PerlIO_fileno (fh);
343	root	1.13	req->callback = SvREFCNT_inc (callback);
344
345			send_req (req);
346
347			void
348			aio_read(fh,offset,length,data,dataoffset,callback)
349			InputStream fh
350			UV offset
351			IV length
352			SV * data
353			IV dataoffset
354			SV * callback
355			PROTOTYPE: $$$$$$
356			CODE:
357			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
358
359			void
360			aio_write(fh,offset,length,data,dataoffset,callback)
361			OutputStream fh
362			UV offset
363			IV length
364			SV * data
365			IV dataoffset
366			SV * callback
367			PROTOTYPE: $$$$$$
368			CODE:
369			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
370
371			void
372			aio_stat(fh_or_path,callback)
373			SV * fh_or_path
374			SV * callback
375			PROTOTYPE: $$
376			ALIAS:
377			aio_lstat = 1
378			CODE:
379			aio_req req;
380
381	root	1.14	Newz (0, req, 1, aio_cb);
382	root	1.13
383			if (!req)
384			croak ("out of memory during aio_req allocation");
385
386			New (0, req->statdata, 1, struct stat64);
387
388			if (!req->statdata)
389			croak ("out of memory during aio_req->statdata allocation");
390
391			if (SvPOK (fh_or_path))
392			{
393			req->type = ix ? REQ_LSTAT : REQ_STAT;
394	root	1.14	req->data = newSVsv (fh_or_path);
395			req->dataptr = SvPV_nolen (req->data);
396	root	1.13	}
397			else
398			{
399			req->type = REQ_FSTAT;
400			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
401			}
402
403	root	1.8	req->callback = SvREFCNT_inc (callback);
404
405			send_req (req);
406	root	1.5
407			int
408			poll_fileno()
409			PROTOTYPE:
410			CODE:
411			RETVAL = respipe[0];
412			OUTPUT:
413			RETVAL
414
415			int
416	root	1.6	poll_cb(...)
417	root	1.5	PROTOTYPE:
418			CODE:
419			RETVAL = poll_cb (aTHX);
420			OUTPUT:
421			RETVAL
422
423			int
424			nreqs()
425			PROTOTYPE:
426			CODE:
427			RETVAL = nreqs;
428			OUTPUT:
429			RETVAL
430