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 <endian.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);
            }

          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

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)
        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: $$
        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)
        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)
        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)
        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)
        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, Stat_t);

        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);
}

void
aio_unlink(pathname,callback)
        SV * pathname
        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_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:	1.7
Committed:	Mon Jul 11 01:49:14 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.6:	+10 -0 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			#include <endian.h>
12
13			#include <pthread.h>
14			#include <sys/syscall.h>
15
16			typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
17			typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
18			typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
19
20	root	1.4	#if __ia64
21			# define STACKSIZE 65536
22	root	1.1	#else
23	root	1.4	# define STACKSIZE 4096
24	root	1.1	#endif
25
26			enum {
27			REQ_QUIT,
28			REQ_OPEN, REQ_CLOSE,
29			REQ_READ, REQ_WRITE, REQ_READAHEAD,
30			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
31			REQ_FSYNC, REQ_FDATASYNC,
32			};
33
34			typedef struct aio_cb {
35	root	1.3	struct aio_cb *volatile next;
36	root	1.1
37			int type;
38
39			int fd;
40			off_t offset;
41			size_t length;
42			ssize_t result;
43			mode_t mode; /* open */
44			int errorno;
45			SV data, callback;
46			void *dataptr;
47			STRLEN dataoffset;
48
49			Stat_t *statdata;
50			} aio_cb;
51
52			typedef aio_cb *aio_req;
53
54			static int started;
55			static int nreqs;
56	root	1.4	static int max_outstanding = 1<<30;
57	root	1.3	static int respipe [2];
58	root	1.1
59	root	1.3	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
60			static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
61			static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
62
63			static volatile aio_req reqs, reqe; /* queue start, queue end */
64			static volatile aio_req ress, rese; /* queue start, queue end */
65	root	1.1
66			static void
67			poll_wait ()
68			{
69	root	1.3	if (!nreqs)
70			return;
71
72	root	1.1	fd_set rfd;
73			FD_ZERO(&rfd);
74	root	1.3	FD_SET(respipe [0], &rfd);
75	root	1.1
76	root	1.3	select (respipe [0] + 1, &rfd, 0, 0, 0);
77	root	1.1	}
78
79			static int
80	root	1.5	poll_cb ()
81	root	1.1	{
82			dSP;
83			int count = 0;
84			aio_req req;
85	root	1.3
86			{
87			/* read and signals sent by the worker threads */
88			char buf [32];
89			while (read (respipe [0], buf, 32) > 0)
90			;
91			}
92	root	1.1
93	root	1.3	for (;;)
94	root	1.1	{
95	root	1.3	pthread_mutex_lock (&reslock);
96
97			req = ress;
98
99			if (ress)
100			{
101			ress = ress->next;
102			if (!ress) rese = 0;
103			}
104
105			pthread_mutex_unlock (&reslock);
106
107			if (!req)
108			break;
109
110	root	1.1	nreqs--;
111
112			if (req->type == REQ_QUIT)
113			started--;
114			else
115			{
116			int errorno = errno;
117			errno = req->errorno;
118
119			if (req->type == REQ_READ)
120			SvCUR_set (req->data, req->dataoffset
121			+ req->result > 0 ? req->result : 0);
122
123			if (req->data)
124			SvREFCNT_dec (req->data);
125
126			if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
127			{
128			PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
129			PL_laststatval = req->result;
130			PL_statcache = *(req->statdata);
131
132			Safefree (req->statdata);
133			}
134
135			PUSHMARK (SP);
136			XPUSHs (sv_2mortal (newSViv (req->result)));
137	root	1.2
138			if (req->type == REQ_OPEN)
139			{
140			/* convert fd to fh */
141			SV *fh;
142
143			PUTBACK;
144			call_pv ("IO::AIO::_fd2fh", G_SCALAR \| G_EVAL);
145			SPAGAIN;
146
147			fh = POPs;
148
149			PUSHMARK (SP);
150			XPUSHs (fh);
151			}
152
153	root	1.1	PUTBACK;
154	root	1.2	call_sv (req->callback, G_VOID \| G_EVAL);
155	root	1.1	SPAGAIN;
156
157			if (req->callback)
158			SvREFCNT_dec (req->callback);
159
160			errno = errorno;
161			count++;
162			}
163
164			Safefree (req);
165			}
166
167			return count;
168			}
169
170	root	1.4	static void aio_proc(void arg);
171
172			static void
173			start_thread (void)
174			{
175			sigset_t fullsigset, oldsigset;
176			pthread_t tid;
177			pthread_attr_t attr;
178
179			pthread_attr_init (&attr);
180			pthread_attr_setstacksize (&attr, STACKSIZE);
181			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
182
183			sigfillset (&fullsigset);
184			sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
185
186			if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
187			started++;
188
189			sigprocmask (SIG_SETMASK, &oldsigset, 0);
190			}
191
192			static void
193			send_req (aio_req req)
194			{
195			nreqs++;
196
197			pthread_mutex_lock (&reqlock);
198
199			req->next = 0;
200
201			if (reqe)
202			{
203			reqe->next = req;
204			reqe = req;
205			}
206			else
207			reqe = reqs = req;
208
209			pthread_cond_signal (&reqwait);
210			pthread_mutex_unlock (&reqlock);
211
212			while (nreqs > max_outstanding)
213			{
214			poll_wait ();
215			poll_cb ();
216			}
217			}
218
219			static void
220			end_thread (void)
221			{
222			aio_req req;
223			New (0, req, 1, aio_cb);
224			req->type = REQ_QUIT;
225
226			send_req (req);
227			}
228
229			static void
230	root	1.5	read_write (int dowrite, int fd, off_t offset, size_t length,
231	root	1.4	SV data, STRLEN dataoffset, SV callback)
232			{
233			aio_req req;
234			STRLEN svlen;
235			char *svptr = SvPV (data, svlen);
236
237			SvUPGRADE (data, SVt_PV);
238			SvPOK_on (data);
239
240			if (dataoffset < 0)
241			dataoffset += svlen;
242
243			if (dataoffset < 0 \|\| dataoffset > svlen)
244			croak ("data offset outside of string");
245
246			if (dowrite)
247			{
248			/* write: check length and adjust. */
249			if (length < 0 \|\| length + dataoffset > svlen)
250			length = svlen - dataoffset;
251			}
252			else
253			{
254			/* read: grow scalar as necessary */
255			svptr = SvGROW (data, length + dataoffset);
256			}
257
258			if (length < 0)
259			croak ("length must not be negative");
260
261			Newz (0, req, 1, aio_cb);
262
263			if (!req)
264			croak ("out of memory during aio_req allocation");
265
266			req->type = dowrite ? REQ_WRITE : REQ_READ;
267			req->fd = fd;
268			req->offset = offset;
269			req->length = length;
270			req->data = SvREFCNT_inc (data);
271			req->dataptr = (char *)svptr + dataoffset;
272			req->callback = SvREFCNT_inc (callback);
273
274			send_req (req);
275			}
276
277	root	1.1	static void *
278			aio_proc (void *thr_arg)
279			{
280			aio_req req;
281	root	1.3	int type;
282	root	1.1
283	root	1.3	do
284	root	1.1	{
285	root	1.3	pthread_mutex_lock (&reqlock);
286
287			for (;;)
288			{
289			req = reqs;
290
291			if (reqs)
292			{
293			reqs = reqs->next;
294			if (!reqs) reqe = 0;
295			}
296
297			if (req)
298			break;
299
300			pthread_cond_wait (&reqwait, &reqlock);
301			}
302
303			pthread_mutex_unlock (&reqlock);
304
305	root	1.1	errno = 0; /* strictly unnecessary */
306
307	root	1.3	type = req->type;
308
309			switch (type)
310	root	1.1	{
311			case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;
312			case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;
313			#if SYS_readahead
314			case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
315			#else
316			case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
317			#endif
318
319			case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
320			case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
321			case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
322
323			case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
324			case REQ_CLOSE: req->result = close (req->fd); break;
325			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
326
327			case REQ_FSYNC: req->result = fsync (req->fd); break;
328			case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
329
330			case REQ_QUIT:
331	root	1.3	break;
332	root	1.1
333			default:
334			req->result = ENOSYS;
335			break;
336			}
337
338			req->errorno = errno;
339	root	1.3
340			pthread_mutex_lock (&reslock);
341
342			req->next = 0;
343
344			if (rese)
345			{
346			rese->next = req;
347			rese = req;
348			}
349			else
350			{
351			rese = ress = req;
352
353			/* write a dummy byte to the pipe so fh becomes ready */
354			write (respipe [1], &respipe, 1);
355			}
356
357			pthread_mutex_unlock (&reslock);
358	root	1.1	}
359	root	1.3	while (type != REQ_QUIT);
360	root	1.1
361			return 0;
362			}
363
364			MODULE = IO::AIO PACKAGE = IO::AIO
365
366			BOOT:
367			{
368	root	1.3	if (pipe (respipe))
369			croak ("unable to initialize result pipe");
370	root	1.1
371	root	1.3	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
372	root	1.1	croak ("cannot set result pipe to nonblocking mode");
373
374	root	1.3	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
375	root	1.1	croak ("cannot set result pipe to nonblocking mode");
376			}
377
378			void
379			min_parallel(nthreads)
380			int nthreads
381			PROTOTYPE: $
382			CODE:
383			while (nthreads > started)
384			start_thread ();
385
386			void
387			max_parallel(nthreads)
388			int nthreads
389			PROTOTYPE: $
390			CODE:
391			{
392			int cur = started;
393			while (cur > nthreads)
394			{
395			end_thread ();
396			cur--;
397			}
398
399			while (started > nthreads)
400			{
401			poll_wait ();
402	root	1.5	poll_cb ();
403	root	1.1	}
404			}
405
406	root	1.4	int
407			max_outstanding(nreqs)
408			int nreqs
409			PROTOTYPE: $
410			CODE:
411			RETVAL = max_outstanding;
412			max_outstanding = nreqs;
413
414	root	1.1	void
415			aio_open(pathname,flags,mode,callback)
416			SV * pathname
417			int flags
418			int mode
419			SV * callback
420			PROTOTYPE: $$$$
421			CODE:
422			{
423			aio_req req;
424
425			Newz (0, req, 1, aio_cb);
426
427			if (!req)
428			croak ("out of memory during aio_req allocation");
429
430			req->type = REQ_OPEN;
431			req->data = newSVsv (pathname);
432			req->dataptr = SvPV_nolen (req->data);
433			req->fd = flags;
434			req->mode = mode;
435			req->callback = SvREFCNT_inc (callback);
436
437			send_req (req);
438			}
439
440			void
441			aio_close(fh,callback)
442			InputStream fh
443			SV * callback
444			PROTOTYPE: $$
445			ALIAS:
446			aio_close = REQ_CLOSE
447			aio_fsync = REQ_FSYNC
448			aio_fdatasync = REQ_FDATASYNC
449			CODE:
450			{
451			aio_req req;
452
453			Newz (0, req, 1, aio_cb);
454
455			if (!req)
456			croak ("out of memory during aio_req allocation");
457
458			req->type = ix;
459			req->fd = PerlIO_fileno (fh);
460			req->callback = SvREFCNT_inc (callback);
461
462			send_req (req);
463			}
464
465			void
466			aio_read(fh,offset,length,data,dataoffset,callback)
467			InputStream fh
468			UV offset
469			IV length
470			SV * data
471			IV dataoffset
472			SV * callback
473			PROTOTYPE: $$$$$$
474			CODE:
475	root	1.5	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
476	root	1.1
477			void
478			aio_write(fh,offset,length,data,dataoffset,callback)
479			OutputStream fh
480			UV offset
481			IV length
482			SV * data
483			IV dataoffset
484			SV * callback
485			PROTOTYPE: $$$$$$
486			CODE:
487	root	1.5	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
488	root	1.1
489			void
490			aio_readahead(fh,offset,length,callback)
491			InputStream fh
492			UV offset
493			IV length
494			SV * callback
495			PROTOTYPE: $$$$
496			CODE:
497			{
498			aio_req req;
499
500			if (length < 0)
501			croak ("length must not be negative");
502
503			Newz (0, req, 1, aio_cb);
504
505			if (!req)
506			croak ("out of memory during aio_req allocation");
507
508			req->type = REQ_READAHEAD;
509			req->fd = PerlIO_fileno (fh);
510			req->offset = offset;
511			req->length = length;
512			req->callback = SvREFCNT_inc (callback);
513
514			send_req (req);
515			}
516
517			void
518			aio_stat(fh_or_path,callback)
519			SV * fh_or_path
520			SV * callback
521			PROTOTYPE: $$
522			ALIAS:
523			aio_lstat = 1
524			CODE:
525			{
526			aio_req req;
527
528			Newz (0, req, 1, aio_cb);
529
530			if (!req)
531			croak ("out of memory during aio_req allocation");
532
533			New (0, req->statdata, 1, Stat_t);
534
535			if (!req->statdata)
536			croak ("out of memory during aio_req->statdata allocation");
537
538			if (SvPOK (fh_or_path))
539			{
540			req->type = ix ? REQ_LSTAT : REQ_STAT;
541			req->data = newSVsv (fh_or_path);
542			req->dataptr = SvPV_nolen (req->data);
543			}
544			else
545			{
546			req->type = REQ_FSTAT;
547			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
548			}
549
550			req->callback = SvREFCNT_inc (callback);
551
552			send_req (req);
553			}
554
555			void
556			aio_unlink(pathname,callback)
557			SV * pathname
558			SV * callback
559			PROTOTYPE: $$
560			CODE:
561			{
562			aio_req req;
563
564			Newz (0, req, 1, aio_cb);
565
566			if (!req)
567			croak ("out of memory during aio_req allocation");
568
569			req->type = REQ_UNLINK;
570			req->data = newSVsv (pathname);
571			req->dataptr = SvPV_nolen (req->data);
572			req->callback = SvREFCNT_inc (callback);
573
574			send_req (req);
575			}
576
577	root	1.6	void
578			flush()
579			PROTOTYPE:
580			CODE:
581			while (nreqs)
582			{
583			poll_wait ();
584			poll_cb ();
585			}
586
587	root	1.7	void
588			poll()
589			PROTOTYPE:
590			CODE:
591			if (nreqs)
592			{
593			poll_wait ();
594			poll_cb ();
595			}
596
597	root	1.1	int
598			poll_fileno()
599			PROTOTYPE:
600			CODE:
601	root	1.3	RETVAL = respipe [0];
602	root	1.1	OUTPUT:
603			RETVAL
604
605			int
606			poll_cb(...)
607			PROTOTYPE:
608			CODE:
609	root	1.5	RETVAL = poll_cb ();
610	root	1.1	OUTPUT:
611			RETVAL
612
613			void
614			poll_wait()
615			PROTOTYPE:
616			CODE:
617	root	1.3	if (nreqs)
618			poll_wait ();
619	root	1.1
620			int
621			nreqs()
622			PROTOTYPE:
623			CODE:
624			RETVAL = nreqs;
625			OUTPUT:
626			RETVAL
627