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 ;) */

#ifndef __NR_pread64
# define __NR_pread64 __NR_pread
#endif
#ifndef __NR_pwrite64
# define __NR_pwrite64 __NR_pwrite
#endif

#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;

  /* this is very much x86 and kernel-specific :(:(:( */
  /* 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)

  _syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
  _syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)

  _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 = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
      else if (req->type == REQ_WRITE)
        req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
      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:	1.16
Committed:	Wed May 5 10:13:30 2004 UTC (20 years ago) by root
Branch:	MAIN
Changes since 1.15:	+16 -9 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	1.16	#ifndef __NR_pread64
17			# define __NR_pread64 __NR_pread
18			#endif
19			#ifndef __NR_pwrite64
20			# define __NR_pwrite64 __NR_pwrite
21			#endif
22
23	root	1.8	#define STACKSIZE 1024 /* yeah */
24	root	1.1
25	root	1.13	enum { REQ_QUIT, REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, REQ_STAT, REQ_LSTAT, REQ_FSTAT};
26	root	1.1
27			typedef struct {
28			char stack[STACKSIZE];
29			} aio_thread;
30
31			typedef struct {
32			int type;
33			aio_thread *thread;
34
35			int fd;
36			off_t offset;
37			size_t length;
38	root	1.2	ssize_t result;
39	root	1.8	mode_t mode; /* open */
40	root	1.1	int errorno;
41	root	1.5	SV data, callback;
42	root	1.1	void *dataptr;
43	root	1.2	STRLEN dataoffset;
44	root	1.13
45			struct stat64 *statdata;
46	root	1.1	} aio_cb;
47
48			typedef aio_cb *aio_req;
49
50			static int started;
51	root	1.5	static int nreqs;
52	root	1.1	static int reqpipe[2], respipe[2];
53
54	root	1.2	static int aio_proc(void *arg);
55
56	root	1.1	static void
57			start_thread(void)
58			{
59	root	1.2	aio_thread *thr;
60
61			New (0, thr, 1, aio_thread);
62
63			if (clone (aio_proc,
64			&(thr->stack[STACKSIZE]),
65			CLONE_VM\|CLONE_FS\|CLONE_FILES\|CLONE_SIGHAND,
66			thr) >= 0)
67			started++;
68			else
69			Safefree (thr);
70	root	1.1	}
71
72			static void
73			end_thread(void)
74			{
75	root	1.5	aio_req req;
76			New (0, req, 1, aio_cb);
77			req->type = REQ_QUIT;
78	root	1.1	write (reqpipe[1], &req, sizeof (aio_req));
79	root	1.2	}
80
81			static void
82	root	1.8	send_req (aio_req req)
83			{
84			nreqs++;
85			write (reqpipe[1], &req, sizeof (aio_req));
86			}
87
88			static void
89	root	1.5	read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
90			SV data, STRLEN dataoffset, SVcallback)
91	root	1.2	{
92	root	1.5	aio_req req;
93			STRLEN svlen;
94			char *svptr = SvPV (data, svlen);
95
96	root	1.13	SvUPGRADE (data, SVt_PV);
97			SvPOK_on (data);
98
99	root	1.5	if (dataoffset < 0)
100			dataoffset += svlen;
101
102			if (dataoffset < 0 \|\| dataoffset > svlen)
103			croak ("data offset outside of string");
104
105			if (dowrite)
106			{
107			/* write: check length and adjust. */
108			if (length < 0 \|\| length + dataoffset > svlen)
109			length = svlen - dataoffset;
110			}
111			else
112			{
113			/* read: grow scalar as necessary */
114			svptr = SvGROW (data, length + dataoffset);
115			}
116
117			if (length < 0)
118			croak ("length must not be negative");
119
120	root	1.14	Newz (0, req, 1, aio_cb);
121	root	1.5
122			if (!req)
123			croak ("out of memory during aio_req allocation");
124
125			req->type = dowrite ? REQ_WRITE : REQ_READ;
126			req->fd = fd;
127			req->offset = offset;
128			req->length = length;
129			req->data = SvREFCNT_inc (data);
130	root	1.6	req->dataptr = (char *)svptr + dataoffset;
131	root	1.5	req->callback = SvREFCNT_inc (callback);
132
133	root	1.8	send_req (req);
134	root	1.5	}
135
136			static int
137			poll_cb (pTHX)
138			{
139			dSP;
140			int count = 0;
141			aio_req req;
142
143			while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
144			{
145			if (req->type == REQ_QUIT)
146			{
147			Safefree (req->thread);
148			started--;
149			}
150			else
151			{
152			int errorno = errno;
153			errno = req->errorno;
154
155			if (req->type == REQ_READ)
156	root	1.6	SvCUR_set (req->data, req->dataoffset
157			+ req->result > 0 ? req->result : 0);
158	root	1.5
159	root	1.14	if (req->data)
160			SvREFCNT_dec (req->data);
161
162	root	1.13	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
163			{
164			PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
165			PL_laststatval = req->result;
166			PL_statcache.st_dev = req->statdata->st_dev;
167			PL_statcache.st_ino = req->statdata->st_ino;
168			PL_statcache.st_mode = req->statdata->st_mode;
169			PL_statcache.st_nlink = req->statdata->st_nlink;
170			PL_statcache.st_uid = req->statdata->st_uid;
171			PL_statcache.st_gid = req->statdata->st_gid;
172			PL_statcache.st_rdev = req->statdata->st_rdev;
173			PL_statcache.st_size = req->statdata->st_size;
174			PL_statcache.st_atime = req->statdata->st_atime;
175			PL_statcache.st_mtime = req->statdata->st_mtime;
176			PL_statcache.st_ctime = req->statdata->st_ctime;
177			PL_statcache.st_blksize = req->statdata->st_blksize;
178			PL_statcache.st_blocks = req->statdata->st_blocks;
179
180			Safefree (req->statdata);
181			}
182
183	root	1.5	PUSHMARK (SP);
184			XPUSHs (sv_2mortal (newSViv (req->result)));
185			PUTBACK;
186			call_sv (req->callback, G_VOID);
187			SPAGAIN;
188
189	root	1.14	if (req->callback)
190			SvREFCNT_dec (req->callback);
191	root	1.5
192			errno = errorno;
193			nreqs--;
194			count++;
195			}
196
197			Safefree (req);
198			}
199
200			return count;
201	root	1.2	}
202
203	root	1.8	static sigset_t fullsigset;
204
205	root	1.2	#undef errno
206			#include <asm/unistd.h>
207
208			static int
209			aio_proc(void *thr_arg)
210			{
211			aio_thread *thr = thr_arg;
212	root	1.9	aio_req req;
213	root	1.2	int errno;
214
215	root	1.15	/* this is very much x86 and kernel-specific :(:(:( */
216	root	1.11	/* we rely on gcc's ability to create closures. */
217	root	1.13	_syscall3(int,read,int,fd,char *,buf,size_t,count)
218			_syscall3(int,write,int,fd,char *,buf,size_t,count)
219
220	root	1.11	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
221			_syscall1(int,close,int,fd)
222
223	root	1.16	_syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
224			_syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
225	root	1.13
226			_syscall2(int,stat64, const char , filename, struct stat64 , buf)
227			_syscall2(int,lstat64, const char , filename, struct stat64 , buf)
228			_syscall2(int,fstat64, int, fd, struct stat64 *, buf)
229
230	root	1.8	sigprocmask (SIG_SETMASK, &fullsigset, 0);
231	root	1.2
232			/* then loop */
233			while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
234			{
235			req->thread = thr;
236	root	1.14	errno = 0; /* strictly unnecessary */
237	root	1.2
238	root	1.13	if (req->type == REQ_READ)
239	root	1.16	req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
240	root	1.13	else if (req->type == REQ_WRITE)
241	root	1.16	req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
242	root	1.8	else if (req->type == REQ_OPEN)
243	root	1.16	req->result = open (req->dataptr, req->fd, req->mode);
244	root	1.10	else if (req->type == REQ_CLOSE)
245	root	1.16	req->result = close (req->fd);
246	root	1.13	else if (req->type == REQ_STAT)
247	root	1.16	req->result = stat64 (req->dataptr, req->statdata);
248	root	1.13	else if (req->type == REQ_LSTAT)
249	root	1.16	req->result = lstat64 (req->dataptr, req->statdata);
250	root	1.13	else if (req->type == REQ_FSTAT)
251	root	1.16	req->result = fstat64 (req->fd, req->statdata);
252	root	1.2	else
253			{
254			write (respipe[1], (void *)&req, sizeof (req));
255			break;
256			}
257
258	root	1.8	req->errorno = errno;
259	root	1.2	write (respipe[1], (void *)&req, sizeof (req));
260			}
261
262			return 0;
263	root	1.1	}
264
265			MODULE = Linux::AIO PACKAGE = Linux::AIO
266
267			BOOT:
268			{
269	root	1.8	sigfillset (&fullsigset);
270	root	1.9	sigdelset (&fullsigset, SIGTERM);
271			sigdelset (&fullsigset, SIGQUIT);
272			sigdelset (&fullsigset, SIGABRT);
273			sigdelset (&fullsigset, SIGINT);
274	root	1.8
275	root	1.1	if (pipe (reqpipe) \|\| pipe (respipe))
276			croak ("unable to initialize request or result pipe");
277	root	1.5
278			if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
279			croak ("cannot set result pipe to nonblocking mode");
280	root	1.1	}
281
282			void
283			min_parallel(nthreads)
284			int nthreads
285	root	1.5	PROTOTYPE: $
286	root	1.1	CODE:
287			while (nthreads > started)
288			start_thread ();
289
290			void
291			max_parallel(nthreads)
292			int nthreads
293	root	1.5	PROTOTYPE: $
294	root	1.1	CODE:
295	root	1.5	int cur = started;
296			while (cur > nthreads)
297			{
298			end_thread ();
299			cur--;
300			}
301
302	root	1.1	while (started > nthreads)
303	root	1.5	{
304	root	1.14	fd_set rfd;
305			FD_ZERO(&rfd);
306			FD_SET(respipe[0], &rfd);
307
308			select (respipe[0] + 1, &rfd, 0, 0, 0);
309	root	1.5	poll_cb ();
310			}
311	root	1.1
312			void
313	root	1.8	aio_open(pathname,flags,mode,callback)
314	root	1.13	SV * pathname
315	root	1.8	int flags
316			int mode
317			SV * callback
318			PROTOTYPE: $$$$
319			CODE:
320			aio_req req;
321
322	root	1.14	Newz (0, req, 1, aio_cb);
323	root	1.8
324			if (!req)
325			croak ("out of memory during aio_req allocation");
326
327			req->type = REQ_OPEN;
328	root	1.14	req->data = newSVsv (pathname);
329			req->dataptr = SvPV_nolen (req->data);
330	root	1.8	req->fd = flags;
331			req->mode = mode;
332	root	1.10	req->callback = SvREFCNT_inc (callback);
333
334			send_req (req);
335
336			void
337			aio_close(fh,callback)
338	root	1.13	InputStream fh
339	root	1.10	SV * callback
340	root	1.14	PROTOTYPE: $$
341	root	1.10	CODE:
342			aio_req req;
343
344	root	1.14	Newz (0, req, 1, aio_cb);
345	root	1.10
346			if (!req)
347			croak ("out of memory during aio_req allocation");
348
349			req->type = REQ_CLOSE;
350			req->fd = PerlIO_fileno (fh);
351	root	1.13	req->callback = SvREFCNT_inc (callback);
352
353			send_req (req);
354
355			void
356			aio_read(fh,offset,length,data,dataoffset,callback)
357			InputStream fh
358			UV offset
359			IV length
360			SV * data
361			IV dataoffset
362			SV * callback
363			PROTOTYPE: $$$$$$
364			CODE:
365			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
366
367			void
368			aio_write(fh,offset,length,data,dataoffset,callback)
369			OutputStream fh
370			UV offset
371			IV length
372			SV * data
373			IV dataoffset
374			SV * callback
375			PROTOTYPE: $$$$$$
376			CODE:
377			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
378
379			void
380			aio_stat(fh_or_path,callback)
381			SV * fh_or_path
382			SV * callback
383			PROTOTYPE: $$
384			ALIAS:
385			aio_lstat = 1
386			CODE:
387			aio_req req;
388
389	root	1.14	Newz (0, req, 1, aio_cb);
390	root	1.13
391			if (!req)
392			croak ("out of memory during aio_req allocation");
393
394			New (0, req->statdata, 1, struct stat64);
395
396			if (!req->statdata)
397			croak ("out of memory during aio_req->statdata allocation");
398
399			if (SvPOK (fh_or_path))
400			{
401			req->type = ix ? REQ_LSTAT : REQ_STAT;
402	root	1.14	req->data = newSVsv (fh_or_path);
403			req->dataptr = SvPV_nolen (req->data);
404	root	1.13	}
405			else
406			{
407			req->type = REQ_FSTAT;
408			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
409			}
410
411	root	1.8	req->callback = SvREFCNT_inc (callback);
412
413			send_req (req);
414	root	1.5
415			int
416			poll_fileno()
417			PROTOTYPE:
418			CODE:
419			RETVAL = respipe[0];
420			OUTPUT:
421			RETVAL
422
423			int
424	root	1.6	poll_cb(...)
425	root	1.5	PROTOTYPE:
426			CODE:
427			RETVAL = poll_cb (aTHX);
428			OUTPUT:
429			RETVAL
430
431			int
432			nreqs()
433			PROTOTYPE:
434			CODE:
435			RETVAL = nreqs;
436			OUTPUT:
437			RETVAL
438