IO-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>
#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 (pTHX)
{
  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 (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 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 (aTHX);
          }
}

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 (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_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);
}

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

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

void
poll_wait()
        PROTOTYPE:
        CODE:
        if (nreqs)
          poll_wait ();

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

Revision:	1.4
Committed:	Sun Jul 10 20:57:00 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_2
Changes since 1.3:	+120 -107 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.1	#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			#include <endian.h>
14
15			#include <pthread.h>
16			#include <sys/syscall.h>
17
18			typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
19			typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
20			typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
21
22	root	1.4	#if __ia64
23			# define STACKSIZE 65536
24	root	1.1	#else
25	root	1.4	# define STACKSIZE 4096
26	root	1.1	#endif
27
28			enum {
29			REQ_QUIT,
30			REQ_OPEN, REQ_CLOSE,
31			REQ_READ, REQ_WRITE, REQ_READAHEAD,
32			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
33			REQ_FSYNC, REQ_FDATASYNC,
34			};
35
36			typedef struct aio_cb {
37	root	1.3	struct aio_cb *volatile next;
38	root	1.1
39			int type;
40
41			int fd;
42			off_t offset;
43			size_t length;
44			ssize_t result;
45			mode_t mode; /* open */
46			int errorno;
47			SV data, callback;
48			void *dataptr;
49			STRLEN dataoffset;
50
51			Stat_t *statdata;
52			} aio_cb;
53
54			typedef aio_cb *aio_req;
55
56			static int started;
57			static int nreqs;
58	root	1.4	static int max_outstanding = 1<<30;
59	root	1.3	static int respipe [2];
60	root	1.1
61	root	1.3	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
62			static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
63			static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
64
65			static volatile aio_req reqs, reqe; /* queue start, queue end */
66			static volatile aio_req ress, rese; /* queue start, queue end */
67	root	1.1
68			static void
69			poll_wait ()
70			{
71	root	1.3	if (!nreqs)
72			return;
73
74	root	1.1	fd_set rfd;
75			FD_ZERO(&rfd);
76	root	1.3	FD_SET(respipe [0], &rfd);
77	root	1.1
78	root	1.3	select (respipe [0] + 1, &rfd, 0, 0, 0);
79	root	1.1	}
80
81			static int
82			poll_cb (pTHX)
83			{
84			dSP;
85			int count = 0;
86			aio_req req;
87	root	1.3
88			{
89			/* read and signals sent by the worker threads */
90			char buf [32];
91			while (read (respipe [0], buf, 32) > 0)
92			;
93			}
94	root	1.1
95	root	1.3	for (;;)
96	root	1.1	{
97	root	1.3	pthread_mutex_lock (&reslock);
98
99			req = ress;
100
101			if (ress)
102			{
103			ress = ress->next;
104			if (!ress) rese = 0;
105			}
106
107			pthread_mutex_unlock (&reslock);
108
109			if (!req)
110			break;
111
112	root	1.1	nreqs--;
113
114			if (req->type == REQ_QUIT)
115			started--;
116			else
117			{
118			int errorno = errno;
119			errno = req->errorno;
120
121			if (req->type == REQ_READ)
122			SvCUR_set (req->data, req->dataoffset
123			+ req->result > 0 ? req->result : 0);
124
125			if (req->data)
126			SvREFCNT_dec (req->data);
127
128			if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
129			{
130			PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
131			PL_laststatval = req->result;
132			PL_statcache = *(req->statdata);
133
134			Safefree (req->statdata);
135			}
136
137			PUSHMARK (SP);
138			XPUSHs (sv_2mortal (newSViv (req->result)));
139	root	1.2
140			if (req->type == REQ_OPEN)
141			{
142			/* convert fd to fh */
143			SV *fh;
144
145			PUTBACK;
146			call_pv ("IO::AIO::_fd2fh", G_SCALAR \| G_EVAL);
147			SPAGAIN;
148
149			fh = POPs;
150
151			PUSHMARK (SP);
152			XPUSHs (fh);
153			}
154
155	root	1.1	PUTBACK;
156	root	1.2	call_sv (req->callback, G_VOID \| G_EVAL);
157	root	1.1	SPAGAIN;
158
159			if (req->callback)
160			SvREFCNT_dec (req->callback);
161
162			errno = errorno;
163			count++;
164			}
165
166			Safefree (req);
167			}
168
169			return count;
170			}
171
172	root	1.4	static void aio_proc(void arg);
173
174			static void
175			start_thread (void)
176			{
177			sigset_t fullsigset, oldsigset;
178			pthread_t tid;
179			pthread_attr_t attr;
180
181			pthread_attr_init (&attr);
182			pthread_attr_setstacksize (&attr, STACKSIZE);
183			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
184
185			sigfillset (&fullsigset);
186			sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
187
188			if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
189			started++;
190
191			sigprocmask (SIG_SETMASK, &oldsigset, 0);
192			}
193
194			static void
195			send_req (aio_req req)
196			{
197			nreqs++;
198
199			pthread_mutex_lock (&reqlock);
200
201			req->next = 0;
202
203			if (reqe)
204			{
205			reqe->next = req;
206			reqe = req;
207			}
208			else
209			reqe = reqs = req;
210
211			pthread_cond_signal (&reqwait);
212			pthread_mutex_unlock (&reqlock);
213
214			while (nreqs > max_outstanding)
215			{
216			poll_wait ();
217			poll_cb ();
218			}
219			}
220
221			static void
222			end_thread (void)
223			{
224			aio_req req;
225			New (0, req, 1, aio_cb);
226			req->type = REQ_QUIT;
227
228			send_req (req);
229			}
230
231			static void
232			read_write (pTHX_
233			int dowrite, int fd, off_t offset, size_t length,
234			SV data, STRLEN dataoffset, SV callback)
235			{
236			aio_req req;
237			STRLEN svlen;
238			char *svptr = SvPV (data, svlen);
239
240			SvUPGRADE (data, SVt_PV);
241			SvPOK_on (data);
242
243			if (dataoffset < 0)
244			dataoffset += svlen;
245
246			if (dataoffset < 0 \|\| dataoffset > svlen)
247			croak ("data offset outside of string");
248
249			if (dowrite)
250			{
251			/* write: check length and adjust. */
252			if (length < 0 \|\| length + dataoffset > svlen)
253			length = svlen - dataoffset;
254			}
255			else
256			{
257			/* read: grow scalar as necessary */
258			svptr = SvGROW (data, length + dataoffset);
259			}
260
261			if (length < 0)
262			croak ("length must not be negative");
263
264			Newz (0, req, 1, aio_cb);
265
266			if (!req)
267			croak ("out of memory during aio_req allocation");
268
269			req->type = dowrite ? REQ_WRITE : REQ_READ;
270			req->fd = fd;
271			req->offset = offset;
272			req->length = length;
273			req->data = SvREFCNT_inc (data);
274			req->dataptr = (char *)svptr + dataoffset;
275			req->callback = SvREFCNT_inc (callback);
276
277			send_req (req);
278			}
279
280	root	1.1	static void *
281			aio_proc (void *thr_arg)
282			{
283			aio_req req;
284	root	1.3	int type;
285	root	1.1
286	root	1.3	do
287	root	1.1	{
288	root	1.3	pthread_mutex_lock (&reqlock);
289
290			for (;;)
291			{
292			req = reqs;
293
294			if (reqs)
295			{
296			reqs = reqs->next;
297			if (!reqs) reqe = 0;
298			}
299
300			if (req)
301			break;
302
303			pthread_cond_wait (&reqwait, &reqlock);
304			}
305
306			pthread_mutex_unlock (&reqlock);
307
308	root	1.1	errno = 0; /* strictly unnecessary */
309
310	root	1.3	type = req->type;
311
312			switch (type)
313	root	1.1	{
314			case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset); break;
315			case REQ_WRITE: req->result = pwrite64 (req->fd, req->dataptr, req->length, req->offset); break;
316			#if SYS_readahead
317			case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
318			#else
319			case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
320			#endif
321
322			case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
323			case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
324			case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
325
326			case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
327			case REQ_CLOSE: req->result = close (req->fd); break;
328			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
329
330			case REQ_FSYNC: req->result = fsync (req->fd); break;
331			case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
332
333			case REQ_QUIT:
334	root	1.3	break;
335	root	1.1
336			default:
337			req->result = ENOSYS;
338			break;
339			}
340
341			req->errorno = errno;
342	root	1.3
343			pthread_mutex_lock (&reslock);
344
345			req->next = 0;
346
347			if (rese)
348			{
349			rese->next = req;
350			rese = req;
351			}
352			else
353			{
354			rese = ress = req;
355
356			/* write a dummy byte to the pipe so fh becomes ready */
357			write (respipe [1], &respipe, 1);
358			}
359
360			pthread_mutex_unlock (&reslock);
361	root	1.1	}
362	root	1.3	while (type != REQ_QUIT);
363	root	1.1
364			return 0;
365			}
366
367			MODULE = IO::AIO PACKAGE = IO::AIO
368
369			BOOT:
370			{
371	root	1.3	if (pipe (respipe))
372			croak ("unable to initialize result pipe");
373	root	1.1
374	root	1.3	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
375	root	1.1	croak ("cannot set result pipe to nonblocking mode");
376
377	root	1.3	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
378	root	1.1	croak ("cannot set result pipe to nonblocking mode");
379			}
380
381			void
382			min_parallel(nthreads)
383			int nthreads
384			PROTOTYPE: $
385			CODE:
386			while (nthreads > started)
387			start_thread ();
388
389			void
390			max_parallel(nthreads)
391			int nthreads
392			PROTOTYPE: $
393			CODE:
394			{
395			int cur = started;
396			while (cur > nthreads)
397			{
398			end_thread ();
399			cur--;
400			}
401
402			while (started > nthreads)
403			{
404			poll_wait ();
405			poll_cb (aTHX);
406			}
407			}
408
409	root	1.4	int
410			max_outstanding(nreqs)
411			int nreqs
412			PROTOTYPE: $
413			CODE:
414			RETVAL = max_outstanding;
415			max_outstanding = nreqs;
416
417	root	1.1	void
418			aio_open(pathname,flags,mode,callback)
419			SV * pathname
420			int flags
421			int mode
422			SV * callback
423			PROTOTYPE: $$$$
424			CODE:
425			{
426			aio_req req;
427
428			Newz (0, req, 1, aio_cb);
429
430			if (!req)
431			croak ("out of memory during aio_req allocation");
432
433			req->type = REQ_OPEN;
434			req->data = newSVsv (pathname);
435			req->dataptr = SvPV_nolen (req->data);
436			req->fd = flags;
437			req->mode = mode;
438			req->callback = SvREFCNT_inc (callback);
439
440			send_req (req);
441			}
442
443			void
444			aio_close(fh,callback)
445			InputStream fh
446			SV * callback
447			PROTOTYPE: $$
448			ALIAS:
449			aio_close = REQ_CLOSE
450			aio_fsync = REQ_FSYNC
451			aio_fdatasync = REQ_FDATASYNC
452			CODE:
453			{
454			aio_req req;
455
456			Newz (0, req, 1, aio_cb);
457
458			if (!req)
459			croak ("out of memory during aio_req allocation");
460
461			req->type = ix;
462			req->fd = PerlIO_fileno (fh);
463			req->callback = SvREFCNT_inc (callback);
464
465			send_req (req);
466			}
467
468			void
469			aio_read(fh,offset,length,data,dataoffset,callback)
470			InputStream fh
471			UV offset
472			IV length
473			SV * data
474			IV dataoffset
475			SV * callback
476			PROTOTYPE: $$$$$$
477			CODE:
478			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
479
480			void
481			aio_write(fh,offset,length,data,dataoffset,callback)
482			OutputStream fh
483			UV offset
484			IV length
485			SV * data
486			IV dataoffset
487			SV * callback
488			PROTOTYPE: $$$$$$
489			CODE:
490			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
491
492			void
493			aio_readahead(fh,offset,length,callback)
494			InputStream fh
495			UV offset
496			IV length
497			SV * callback
498			PROTOTYPE: $$$$
499			CODE:
500			{
501			aio_req req;
502
503			if (length < 0)
504			croak ("length must not be negative");
505
506			Newz (0, req, 1, aio_cb);
507
508			if (!req)
509			croak ("out of memory during aio_req allocation");
510
511			req->type = REQ_READAHEAD;
512			req->fd = PerlIO_fileno (fh);
513			req->offset = offset;
514			req->length = length;
515			req->callback = SvREFCNT_inc (callback);
516
517			send_req (req);
518			}
519
520			void
521			aio_stat(fh_or_path,callback)
522			SV * fh_or_path
523			SV * callback
524			PROTOTYPE: $$
525			ALIAS:
526			aio_lstat = 1
527			CODE:
528			{
529			aio_req req;
530
531			Newz (0, req, 1, aio_cb);
532
533			if (!req)
534			croak ("out of memory during aio_req allocation");
535
536			New (0, req->statdata, 1, Stat_t);
537
538			if (!req->statdata)
539			croak ("out of memory during aio_req->statdata allocation");
540
541			if (SvPOK (fh_or_path))
542			{
543			req->type = ix ? REQ_LSTAT : REQ_STAT;
544			req->data = newSVsv (fh_or_path);
545			req->dataptr = SvPV_nolen (req->data);
546			}
547			else
548			{
549			req->type = REQ_FSTAT;
550			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
551			}
552
553			req->callback = SvREFCNT_inc (callback);
554
555			send_req (req);
556			}
557
558			void
559			aio_unlink(pathname,callback)
560			SV * pathname
561			SV * callback
562			PROTOTYPE: $$
563			CODE:
564			{
565			aio_req req;
566
567			Newz (0, req, 1, aio_cb);
568
569			if (!req)
570			croak ("out of memory during aio_req allocation");
571
572			req->type = REQ_UNLINK;
573			req->data = newSVsv (pathname);
574			req->dataptr = SvPV_nolen (req->data);
575			req->callback = SvREFCNT_inc (callback);
576
577			send_req (req);
578			}
579
580			int
581			poll_fileno()
582			PROTOTYPE:
583			CODE:
584	root	1.3	RETVAL = respipe [0];
585	root	1.1	OUTPUT:
586			RETVAL
587
588			int
589			poll_cb(...)
590			PROTOTYPE:
591			CODE:
592			RETVAL = poll_cb (aTHX);
593			OUTPUT:
594			RETVAL
595
596			void
597			poll_wait()
598			PROTOTYPE:
599			CODE:
600	root	1.3	if (nreqs)
601			poll_wait ();
602	root	1.1
603			int
604			nreqs()
605			PROTOTYPE:
606			CODE:
607			RETVAL = nreqs;
608			OUTPUT:
609			RETVAL
610