Linux-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>

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 (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: $$
        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:	1.17
Committed:	Thu May 6 12:16:48 2004 UTC (20 years ago) by root
Branch:	MAIN
Changes since 1.16:	+5 -2 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.17	#define PERL_NO_GET_CONTEXT
2
3	root	1.1	#include "EXTERN.h"
4			#include "perl.h"
5			#include "XSUB.h"
6
7			#include <sys/types.h>
8	root	1.13	#include <sys/stat.h>
9	root	1.1	#include <unistd.h>
10	root	1.5	#include <fcntl.h>
11	root	1.8	#include <signal.h>
12	root	1.1	#include <sched.h>
13
14	root	1.13	typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
15			typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
16	root	1.12	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
17
18	root	1.16	#ifndef __NR_pread64
19			# define __NR_pread64 __NR_pread
20			#endif
21			#ifndef __NR_pwrite64
22			# define __NR_pwrite64 __NR_pwrite
23			#endif
24
25	root	1.8	#define STACKSIZE 1024 /* yeah */
26	root	1.1
27	root	1.13	enum { REQ_QUIT, REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, REQ_STAT, REQ_LSTAT, REQ_FSTAT};
28	root	1.1
29			typedef struct {
30			char stack[STACKSIZE];
31			} aio_thread;
32
33			typedef struct {
34			int type;
35			aio_thread *thread;
36
37			int fd;
38			off_t offset;
39			size_t length;
40	root	1.2	ssize_t result;
41	root	1.8	mode_t mode; /* open */
42	root	1.1	int errorno;
43	root	1.5	SV data, callback;
44	root	1.1	void *dataptr;
45	root	1.2	STRLEN dataoffset;
46	root	1.13
47			struct stat64 *statdata;
48	root	1.1	} aio_cb;
49
50			typedef aio_cb *aio_req;
51
52			static int started;
53	root	1.5	static int nreqs;
54	root	1.1	static int reqpipe[2], respipe[2];
55
56	root	1.2	static int aio_proc(void *arg);
57
58	root	1.1	static void
59			start_thread(void)
60			{
61	root	1.2	aio_thread *thr;
62
63			New (0, thr, 1, aio_thread);
64
65			if (clone (aio_proc,
66			&(thr->stack[STACKSIZE]),
67			CLONE_VM\|CLONE_FS\|CLONE_FILES\|CLONE_SIGHAND,
68			thr) >= 0)
69			started++;
70			else
71			Safefree (thr);
72	root	1.1	}
73
74			static void
75			end_thread(void)
76			{
77	root	1.5	aio_req req;
78			New (0, req, 1, aio_cb);
79			req->type = REQ_QUIT;
80	root	1.1	write (reqpipe[1], &req, sizeof (aio_req));
81	root	1.2	}
82
83			static void
84	root	1.8	send_req (aio_req req)
85			{
86			nreqs++;
87			write (reqpipe[1], &req, sizeof (aio_req));
88			}
89
90			static void
91	root	1.17	read_write (pTHX_
92			int dowrite, int fd, off_t offset, size_t length,
93	root	1.5	SV data, STRLEN dataoffset, SVcallback)
94	root	1.2	{
95	root	1.5	aio_req req;
96			STRLEN svlen;
97			char *svptr = SvPV (data, svlen);
98
99	root	1.13	SvUPGRADE (data, SVt_PV);
100			SvPOK_on (data);
101
102	root	1.5	if (dataoffset < 0)
103			dataoffset += svlen;
104
105			if (dataoffset < 0 \|\| dataoffset > svlen)
106			croak ("data offset outside of string");
107
108			if (dowrite)
109			{
110			/* write: check length and adjust. */
111			if (length < 0 \|\| length + dataoffset > svlen)
112			length = svlen - dataoffset;
113			}
114			else
115			{
116			/* read: grow scalar as necessary */
117			svptr = SvGROW (data, length + dataoffset);
118			}
119
120			if (length < 0)
121			croak ("length must not be negative");
122
123	root	1.14	Newz (0, req, 1, aio_cb);
124	root	1.5
125			if (!req)
126			croak ("out of memory during aio_req allocation");
127
128			req->type = dowrite ? REQ_WRITE : REQ_READ;
129			req->fd = fd;
130			req->offset = offset;
131			req->length = length;
132			req->data = SvREFCNT_inc (data);
133	root	1.6	req->dataptr = (char *)svptr + dataoffset;
134	root	1.5	req->callback = SvREFCNT_inc (callback);
135
136	root	1.8	send_req (req);
137	root	1.5	}
138
139			static int
140			poll_cb (pTHX)
141			{
142			dSP;
143			int count = 0;
144			aio_req req;
145
146			while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
147			{
148			if (req->type == REQ_QUIT)
149			{
150			Safefree (req->thread);
151			started--;
152			}
153			else
154			{
155			int errorno = errno;
156			errno = req->errorno;
157
158			if (req->type == REQ_READ)
159	root	1.6	SvCUR_set (req->data, req->dataoffset
160			+ req->result > 0 ? req->result : 0);
161	root	1.5
162	root	1.14	if (req->data)
163			SvREFCNT_dec (req->data);
164
165	root	1.13	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
166			{
167			PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
168			PL_laststatval = req->result;
169			PL_statcache.st_dev = req->statdata->st_dev;
170			PL_statcache.st_ino = req->statdata->st_ino;
171			PL_statcache.st_mode = req->statdata->st_mode;
172			PL_statcache.st_nlink = req->statdata->st_nlink;
173			PL_statcache.st_uid = req->statdata->st_uid;
174			PL_statcache.st_gid = req->statdata->st_gid;
175			PL_statcache.st_rdev = req->statdata->st_rdev;
176			PL_statcache.st_size = req->statdata->st_size;
177			PL_statcache.st_atime = req->statdata->st_atime;
178			PL_statcache.st_mtime = req->statdata->st_mtime;
179			PL_statcache.st_ctime = req->statdata->st_ctime;
180			PL_statcache.st_blksize = req->statdata->st_blksize;
181			PL_statcache.st_blocks = req->statdata->st_blocks;
182
183			Safefree (req->statdata);
184			}
185
186	root	1.5	PUSHMARK (SP);
187			XPUSHs (sv_2mortal (newSViv (req->result)));
188			PUTBACK;
189			call_sv (req->callback, G_VOID);
190			SPAGAIN;
191
192	root	1.14	if (req->callback)
193			SvREFCNT_dec (req->callback);
194	root	1.5
195			errno = errorno;
196			nreqs--;
197			count++;
198			}
199
200			Safefree (req);
201			}
202
203			return count;
204	root	1.2	}
205
206	root	1.8	static sigset_t fullsigset;
207
208	root	1.2	#undef errno
209			#include <asm/unistd.h>
210
211			static int
212			aio_proc(void *thr_arg)
213			{
214			aio_thread *thr = thr_arg;
215	root	1.9	aio_req req;
216	root	1.2	int errno;
217
218	root	1.15	/* this is very much x86 and kernel-specific :(:(:( */
219	root	1.11	/* we rely on gcc's ability to create closures. */
220	root	1.13	_syscall3(int,read,int,fd,char *,buf,size_t,count)
221			_syscall3(int,write,int,fd,char *,buf,size_t,count)
222
223	root	1.11	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
224			_syscall1(int,close,int,fd)
225
226	root	1.16	_syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
227			_syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
228	root	1.13
229			_syscall2(int,stat64, const char , filename, struct stat64 , buf)
230			_syscall2(int,lstat64, const char , filename, struct stat64 , buf)
231			_syscall2(int,fstat64, int, fd, struct stat64 *, buf)
232
233	root	1.8	sigprocmask (SIG_SETMASK, &fullsigset, 0);
234	root	1.2
235			/* then loop */
236			while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
237			{
238			req->thread = thr;
239	root	1.14	errno = 0; /* strictly unnecessary */
240	root	1.2
241	root	1.13	if (req->type == REQ_READ)
242	root	1.16	req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
243	root	1.13	else if (req->type == REQ_WRITE)
244	root	1.16	req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
245	root	1.8	else if (req->type == REQ_OPEN)
246	root	1.16	req->result = open (req->dataptr, req->fd, req->mode);
247	root	1.10	else if (req->type == REQ_CLOSE)
248	root	1.16	req->result = close (req->fd);
249	root	1.13	else if (req->type == REQ_STAT)
250	root	1.16	req->result = stat64 (req->dataptr, req->statdata);
251	root	1.13	else if (req->type == REQ_LSTAT)
252	root	1.16	req->result = lstat64 (req->dataptr, req->statdata);
253	root	1.13	else if (req->type == REQ_FSTAT)
254	root	1.16	req->result = fstat64 (req->fd, req->statdata);
255	root	1.2	else
256			{
257			write (respipe[1], (void *)&req, sizeof (req));
258			break;
259			}
260
261	root	1.8	req->errorno = errno;
262	root	1.2	write (respipe[1], (void *)&req, sizeof (req));
263			}
264
265			return 0;
266	root	1.1	}
267
268			MODULE = Linux::AIO PACKAGE = Linux::AIO
269
270			BOOT:
271			{
272	root	1.8	sigfillset (&fullsigset);
273	root	1.9	sigdelset (&fullsigset, SIGTERM);
274			sigdelset (&fullsigset, SIGQUIT);
275			sigdelset (&fullsigset, SIGABRT);
276			sigdelset (&fullsigset, SIGINT);
277	root	1.8
278	root	1.1	if (pipe (reqpipe) \|\| pipe (respipe))
279			croak ("unable to initialize request or result pipe");
280	root	1.5
281			if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
282			croak ("cannot set result pipe to nonblocking mode");
283	root	1.1	}
284
285			void
286			min_parallel(nthreads)
287			int nthreads
288	root	1.5	PROTOTYPE: $
289	root	1.1	CODE:
290			while (nthreads > started)
291			start_thread ();
292
293			void
294			max_parallel(nthreads)
295			int nthreads
296	root	1.5	PROTOTYPE: $
297	root	1.1	CODE:
298	root	1.5	int cur = started;
299			while (cur > nthreads)
300			{
301			end_thread ();
302			cur--;
303			}
304
305	root	1.1	while (started > nthreads)
306	root	1.5	{
307	root	1.14	fd_set rfd;
308			FD_ZERO(&rfd);
309			FD_SET(respipe[0], &rfd);
310
311			select (respipe[0] + 1, &rfd, 0, 0, 0);
312	root	1.17	poll_cb (aTHX);
313	root	1.5	}
314	root	1.1
315			void
316	root	1.8	aio_open(pathname,flags,mode,callback)
317	root	1.13	SV * pathname
318	root	1.8	int flags
319			int mode
320			SV * callback
321			PROTOTYPE: $$$$
322			CODE:
323			aio_req req;
324
325	root	1.14	Newz (0, req, 1, aio_cb);
326	root	1.8
327			if (!req)
328			croak ("out of memory during aio_req allocation");
329
330			req->type = REQ_OPEN;
331	root	1.14	req->data = newSVsv (pathname);
332			req->dataptr = SvPV_nolen (req->data);
333	root	1.8	req->fd = flags;
334			req->mode = mode;
335	root	1.10	req->callback = SvREFCNT_inc (callback);
336
337			send_req (req);
338
339			void
340			aio_close(fh,callback)
341	root	1.13	InputStream fh
342	root	1.10	SV * callback
343	root	1.14	PROTOTYPE: $$
344	root	1.10	CODE:
345			aio_req req;
346
347	root	1.14	Newz (0, req, 1, aio_cb);
348	root	1.10
349			if (!req)
350			croak ("out of memory during aio_req allocation");
351
352			req->type = REQ_CLOSE;
353			req->fd = PerlIO_fileno (fh);
354	root	1.13	req->callback = SvREFCNT_inc (callback);
355
356			send_req (req);
357
358			void
359			aio_read(fh,offset,length,data,dataoffset,callback)
360			InputStream fh
361			UV offset
362			IV length
363			SV * data
364			IV dataoffset
365			SV * callback
366			PROTOTYPE: $$$$$$
367			CODE:
368			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
369
370			void
371			aio_write(fh,offset,length,data,dataoffset,callback)
372			OutputStream fh
373			UV offset
374			IV length
375			SV * data
376			IV dataoffset
377			SV * callback
378			PROTOTYPE: $$$$$$
379			CODE:
380			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
381
382			void
383			aio_stat(fh_or_path,callback)
384			SV * fh_or_path
385			SV * callback
386			PROTOTYPE: $$
387			ALIAS:
388			aio_lstat = 1
389			CODE:
390			aio_req req;
391
392	root	1.14	Newz (0, req, 1, aio_cb);
393	root	1.13
394			if (!req)
395			croak ("out of memory during aio_req allocation");
396
397			New (0, req->statdata, 1, struct stat64);
398
399			if (!req->statdata)
400			croak ("out of memory during aio_req->statdata allocation");
401
402			if (SvPOK (fh_or_path))
403			{
404			req->type = ix ? REQ_LSTAT : REQ_STAT;
405	root	1.14	req->data = newSVsv (fh_or_path);
406			req->dataptr = SvPV_nolen (req->data);
407	root	1.13	}
408			else
409			{
410			req->type = REQ_FSTAT;
411			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
412			}
413
414	root	1.8	req->callback = SvREFCNT_inc (callback);
415
416			send_req (req);
417	root	1.5
418			int
419			poll_fileno()
420			PROTOTYPE:
421			CODE:
422			RETVAL = respipe[0];
423			OUTPUT:
424			RETVAL
425
426			int
427	root	1.6	poll_cb(...)
428	root	1.5	PROTOTYPE:
429			CODE:
430			RETVAL = poll_cb (aTHX);
431			OUTPUT:
432			RETVAL
433
434			int
435			nreqs()
436			PROTOTYPE:
437			CODE:
438			RETVAL = nreqs;
439			OUTPUT:
440			RETVAL
441