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 *
#	Content
1	#define PERL_NO_GET_CONTEXT
2
3	#include "EXTERN.h"
4	#include "perl.h"
5	#include "XSUB.h"
6
7	#include <sys/types.h>
8	#include <sys/stat.h>
9	#include <unistd.h>
10	#include <fcntl.h>
11	#include <signal.h>
12	#include <sched.h>
13
14	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	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
17
18	#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	#define STACKSIZE 1024 /* yeah */
26
27	enum { REQ_QUIT, REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, REQ_STAT, REQ_LSTAT, REQ_FSTAT};
28
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	ssize_t result;
41	mode_t mode; /* open */
42	int errorno;
43	SV data, callback;
44	void *dataptr;
45	STRLEN dataoffset;
46
47	struct stat64 *statdata;
48	} aio_cb;
49
50	typedef aio_cb *aio_req;
51
52	static int started;
53	static int nreqs;
54	static int reqpipe[2], respipe[2];
55
56	static int aio_proc(void *arg);
57
58	static void
59	start_thread(void)
60	{
61	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	}
73
74	static void
75	end_thread(void)
76	{
77	aio_req req;
78	New (0, req, 1, aio_cb);
79	req->type = REQ_QUIT;
80	write (reqpipe[1], &req, sizeof (aio_req));
81	}
82
83	static void
84	send_req (aio_req req)
85	{
86	nreqs++;
87	write (reqpipe[1], &req, sizeof (aio_req));
88	}
89
90	static void
91	read_write (pTHX_
92	int dowrite, int fd, off_t offset, size_t length,
93	SV data, STRLEN dataoffset, SVcallback)
94	{
95	aio_req req;
96	STRLEN svlen;
97	char *svptr = SvPV (data, svlen);
98
99	SvUPGRADE (data, SVt_PV);
100	SvPOK_on (data);
101
102	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	Newz (0, req, 1, aio_cb);
124
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	req->dataptr = (char *)svptr + dataoffset;
134	req->callback = SvREFCNT_inc (callback);
135
136	send_req (req);
137	}
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	SvCUR_set (req->data, req->dataoffset
160	+ req->result > 0 ? req->result : 0);
161
162	if (req->data)
163	SvREFCNT_dec (req->data);
164
165	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	PUSHMARK (SP);
187	XPUSHs (sv_2mortal (newSViv (req->result)));
188	PUTBACK;
189	call_sv (req->callback, G_VOID);
190	SPAGAIN;
191
192	if (req->callback)
193	SvREFCNT_dec (req->callback);
194
195	errno = errorno;
196	nreqs--;
197	count++;
198	}
199
200	Safefree (req);
201	}
202
203	return count;
204	}
205
206	static sigset_t fullsigset;
207
208	#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	aio_req req;
216	int errno;
217
218	/* this is very much x86 and kernel-specific :(:(:( */
219	/* we rely on gcc's ability to create closures. */
220	_syscall3(int,read,int,fd,char *,buf,size_t,count)
221	_syscall3(int,write,int,fd,char *,buf,size_t,count)
222
223	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
224	_syscall1(int,close,int,fd)
225
226	_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
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	sigprocmask (SIG_SETMASK, &fullsigset, 0);
234
235	/* then loop */
236	while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
237	{
238	req->thread = thr;
239	errno = 0; /* strictly unnecessary */
240
241	if (req->type == REQ_READ)
242	req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
243	else if (req->type == REQ_WRITE)
244	req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32);
245	else if (req->type == REQ_OPEN)
246	req->result = open (req->dataptr, req->fd, req->mode);
247	else if (req->type == REQ_CLOSE)
248	req->result = close (req->fd);
249	else if (req->type == REQ_STAT)
250	req->result = stat64 (req->dataptr, req->statdata);
251	else if (req->type == REQ_LSTAT)
252	req->result = lstat64 (req->dataptr, req->statdata);
253	else if (req->type == REQ_FSTAT)
254	req->result = fstat64 (req->fd, req->statdata);
255	else
256	{
257	write (respipe[1], (void *)&req, sizeof (req));
258	break;
259	}
260
261	req->errorno = errno;
262	write (respipe[1], (void *)&req, sizeof (req));
263	}
264
265	return 0;
266	}
267
268	MODULE = Linux::AIO PACKAGE = Linux::AIO
269
270	BOOT:
271	{
272	sigfillset (&fullsigset);
273	sigdelset (&fullsigset, SIGTERM);
274	sigdelset (&fullsigset, SIGQUIT);
275	sigdelset (&fullsigset, SIGABRT);
276	sigdelset (&fullsigset, SIGINT);
277
278	if (pipe (reqpipe) \|\| pipe (respipe))
279	croak ("unable to initialize request or result pipe");
280
281	if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
282	croak ("cannot set result pipe to nonblocking mode");
283	}
284
285	void
286	min_parallel(nthreads)
287	int nthreads
288	PROTOTYPE: $
289	CODE:
290	while (nthreads > started)
291	start_thread ();
292
293	void
294	max_parallel(nthreads)
295	int nthreads
296	PROTOTYPE: $
297	CODE:
298	int cur = started;
299	while (cur > nthreads)
300	{
301	end_thread ();
302	cur--;
303	}
304
305	while (started > nthreads)
306	{
307	fd_set rfd;
308	FD_ZERO(&rfd);
309	FD_SET(respipe[0], &rfd);
310
311	select (respipe[0] + 1, &rfd, 0, 0, 0);
312	poll_cb (aTHX);
313	}
314
315	void
316	aio_open(pathname,flags,mode,callback)
317	SV * pathname
318	int flags
319	int mode
320	SV * callback
321	PROTOTYPE: $$$$
322	CODE:
323	aio_req req;
324
325	Newz (0, req, 1, aio_cb);
326
327	if (!req)
328	croak ("out of memory during aio_req allocation");
329
330	req->type = REQ_OPEN;
331	req->data = newSVsv (pathname);
332	req->dataptr = SvPV_nolen (req->data);
333	req->fd = flags;
334	req->mode = mode;
335	req->callback = SvREFCNT_inc (callback);
336
337	send_req (req);
338
339	void
340	aio_close(fh,callback)
341	InputStream fh
342	SV * callback
343	PROTOTYPE: $$
344	CODE:
345	aio_req req;
346
347	Newz (0, req, 1, aio_cb);
348
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	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	Newz (0, req, 1, aio_cb);
393
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	req->data = newSVsv (fh_or_path);
406	req->dataptr = SvPV_nolen (req->data);
407	}
408	else
409	{
410	req->type = REQ_FSTAT;
411	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
412	}
413
414	req->callback = SvREFCNT_inc (callback);
415
416	send_req (req);
417
418	int
419	poll_fileno()
420	PROTOTYPE:
421	CODE:
422	RETVAL = respipe[0];
423	OUTPUT:
424	RETVAL
425
426	int
427	poll_cb(...)
428	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