IO-AIO/AIO.xs

#define _XOPEN_SOURCE 500

#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>
#if __linux
#include <sys/syscall.h>
#endif

#include <pthread.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 volatile 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 && !ress)
    {
      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, prv;

  static int rl;//D
  //printf ("%d ENTER\n", ++rl);//D

  pthread_mutex_lock (&reslock);

  {
    /* read any signals sent by the worker threads */
    char buf [32];
    while (read (respipe [0], buf, 32) > 0)
      ;
  }

  req = ress;
  ress = rese = 0;

  pthread_mutex_unlock (&reslock);

  while (req)
    {
      nreqs--;
      //printf ("%d count %d %p->%p\n", rl, count, req, req->next);//D

      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);
            }

          if (SvOK (req->callback))
            {
              PUTBACK;
              call_sv (req->callback, G_VOID | G_EVAL);
              SPAGAIN;
            }
          
          if (req->callback)
            SvREFCNT_dec (req->callback);

          errno = errorno;
          count++;
        }

      prv = req;
      req = req->next;
      Safefree (prv);

      /* TODO: croak on errors? */
    }

  //printf ("%d LEAVE %p %p\n", rl--, ress, rese);//D
  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 = pread     (req->fd, req->dataptr, req->length, req->offset); break;
          case REQ_WRITE:     req->result = pwrite    (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

PROTOTYPES: ENABLE

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=&PL_sv_undef)
        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=&PL_sv_undef)
        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=&PL_sv_undef)
        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=&PL_sv_undef)
        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=&PL_sv_undef)
        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=&PL_sv_undef)
        SV *            fh_or_path
        SV *            callback
        ALIAS:
           aio_stat  = REQ_STAT
           aio_lstat = REQ_LSTAT
        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->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=&PL_sv_undef)
        SV * pathname
        SV * callback
        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:	1.11
Committed:	Wed Jul 20 21:55:27 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
CVS Tags:	rel-0_9
Changes since 1.10:	+30 -29 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.11	#define _XOPEN_SOURCE 500
2
3	root	1.1	#include "EXTERN.h"
4			#include "perl.h"
5			#include "XSUB.h"
6
7			#include <sys/types.h>
8			#include <sys/stat.h>
9	root	1.10
10	root	1.1	#include <unistd.h>
11			#include <fcntl.h>
12			#include <signal.h>
13			#include <sched.h>
14	root	1.10	#if __linux
15			#include <sys/syscall.h>
16			#endif
17	root	1.1
18			#include <pthread.h>
19
20			typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
21			typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
22			typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
23
24	root	1.4	#if __ia64
25			# define STACKSIZE 65536
26	root	1.1	#else
27	root	1.4	# define STACKSIZE 4096
28	root	1.1	#endif
29
30			enum {
31			REQ_QUIT,
32			REQ_OPEN, REQ_CLOSE,
33			REQ_READ, REQ_WRITE, REQ_READAHEAD,
34			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK,
35			REQ_FSYNC, REQ_FDATASYNC,
36			};
37
38			typedef struct aio_cb {
39	root	1.3	struct aio_cb *volatile next;
40	root	1.1
41			int type;
42
43			int fd;
44			off_t offset;
45			size_t length;
46			ssize_t result;
47			mode_t mode; /* open */
48			int errorno;
49			SV data, callback;
50			void *dataptr;
51			STRLEN dataoffset;
52
53			Stat_t *statdata;
54			} aio_cb;
55
56			typedef aio_cb *aio_req;
57
58			static int started;
59	root	1.11	static volatile int nreqs;
60	root	1.4	static int max_outstanding = 1<<30;
61	root	1.3	static int respipe [2];
62	root	1.1
63	root	1.3	static pthread_mutex_t reslock = PTHREAD_MUTEX_INITIALIZER;
64			static pthread_mutex_t reqlock = PTHREAD_MUTEX_INITIALIZER;
65			static pthread_cond_t reqwait = PTHREAD_COND_INITIALIZER;
66
67			static volatile aio_req reqs, reqe; /* queue start, queue end */
68			static volatile aio_req ress, rese; /* queue start, queue end */
69	root	1.1
70			static void
71			poll_wait ()
72			{
73	root	1.11	if (nreqs && !ress)
74			{
75			fd_set rfd;
76			FD_ZERO(&rfd);
77			FD_SET(respipe [0], &rfd);
78	root	1.3
79	root	1.11	select (respipe [0] + 1, &rfd, 0, 0, 0);
80			}
81	root	1.1	}
82
83			static int
84	root	1.5	poll_cb ()
85	root	1.1	{
86			dSP;
87			int count = 0;
88	root	1.11	aio_req req, prv;
89
90			static int rl;//D
91			//printf ("%d ENTER\n", ++rl);//D
92
93			pthread_mutex_lock (&reslock);
94
95	root	1.3	{
96	root	1.11	/* read any signals sent by the worker threads */
97	root	1.3	char buf [32];
98			while (read (respipe [0], buf, 32) > 0)
99			;
100			}
101	root	1.1
102	root	1.11	req = ress;
103			ress = rese = 0;
104	root	1.3
105	root	1.11	pthread_mutex_unlock (&reslock);
106	root	1.3
107	root	1.11	while (req)
108			{
109	root	1.1	nreqs--;
110	root	1.11	//printf ("%d count %d %p->%p\n", rl, count, req, req->next);//D
111	root	1.1
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	1.8	if (SvOK (req->callback))
154			{
155			PUTBACK;
156			call_sv (req->callback, G_VOID \| G_EVAL);
157			SPAGAIN;
158			}
159	root	1.1
160			if (req->callback)
161			SvREFCNT_dec (req->callback);
162
163			errno = errorno;
164			count++;
165			}
166
167	root	1.11	prv = req;
168			req = req->next;
169			Safefree (prv);
170
171			/* TODO: croak on errors? */
172	root	1.1	}
173
174	root	1.11	//printf ("%d LEAVE %p %p\n", rl--, ress, rese);//D
175	root	1.1	return count;
176			}
177
178	root	1.4	static void aio_proc(void arg);
179
180			static void
181			start_thread (void)
182			{
183			sigset_t fullsigset, oldsigset;
184			pthread_t tid;
185			pthread_attr_t attr;
186
187			pthread_attr_init (&attr);
188			pthread_attr_setstacksize (&attr, STACKSIZE);
189			pthread_attr_setdetachstate (&attr, PTHREAD_CREATE_DETACHED);
190
191			sigfillset (&fullsigset);
192			sigprocmask (SIG_SETMASK, &fullsigset, &oldsigset);
193
194			if (pthread_create (&tid, &attr, aio_proc, 0) == 0)
195			started++;
196
197			sigprocmask (SIG_SETMASK, &oldsigset, 0);
198			}
199
200			static void
201			send_req (aio_req req)
202			{
203			nreqs++;
204
205			pthread_mutex_lock (&reqlock);
206
207			req->next = 0;
208
209			if (reqe)
210			{
211			reqe->next = req;
212			reqe = req;
213			}
214			else
215			reqe = reqs = req;
216
217			pthread_cond_signal (&reqwait);
218			pthread_mutex_unlock (&reqlock);
219
220			while (nreqs > max_outstanding)
221			{
222			poll_wait ();
223			poll_cb ();
224			}
225			}
226
227			static void
228			end_thread (void)
229			{
230			aio_req req;
231			New (0, req, 1, aio_cb);
232			req->type = REQ_QUIT;
233
234			send_req (req);
235			}
236
237			static void
238	root	1.5	read_write (int dowrite, int fd, off_t offset, size_t length,
239	root	1.4	SV data, STRLEN dataoffset, SV callback)
240			{
241			aio_req req;
242			STRLEN svlen;
243			char *svptr = SvPV (data, svlen);
244
245			SvUPGRADE (data, SVt_PV);
246			SvPOK_on (data);
247
248			if (dataoffset < 0)
249			dataoffset += svlen;
250
251			if (dataoffset < 0 \|\| dataoffset > svlen)
252			croak ("data offset outside of string");
253
254			if (dowrite)
255			{
256			/* write: check length and adjust. */
257			if (length < 0 \|\| length + dataoffset > svlen)
258			length = svlen - dataoffset;
259			}
260			else
261			{
262			/* read: grow scalar as necessary */
263			svptr = SvGROW (data, length + dataoffset);
264			}
265
266			if (length < 0)
267			croak ("length must not be negative");
268
269			Newz (0, req, 1, aio_cb);
270
271			if (!req)
272			croak ("out of memory during aio_req allocation");
273
274			req->type = dowrite ? REQ_WRITE : REQ_READ;
275			req->fd = fd;
276			req->offset = offset;
277			req->length = length;
278			req->data = SvREFCNT_inc (data);
279			req->dataptr = (char *)svptr + dataoffset;
280			req->callback = SvREFCNT_inc (callback);
281
282			send_req (req);
283			}
284
285	root	1.1	static void *
286			aio_proc (void *thr_arg)
287			{
288			aio_req req;
289	root	1.3	int type;
290	root	1.1
291	root	1.3	do
292	root	1.1	{
293	root	1.3	pthread_mutex_lock (&reqlock);
294
295			for (;;)
296			{
297			req = reqs;
298
299			if (reqs)
300			{
301			reqs = reqs->next;
302			if (!reqs) reqe = 0;
303			}
304
305			if (req)
306			break;
307
308			pthread_cond_wait (&reqwait, &reqlock);
309			}
310
311			pthread_mutex_unlock (&reqlock);
312
313	root	1.1	errno = 0; /* strictly unnecessary */
314
315	root	1.3	type = req->type;
316
317			switch (type)
318	root	1.1	{
319	root	1.10	case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
320			case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
321	root	1.1	#if SYS_readahead
322			case REQ_READAHEAD: req->result = readahead (req->fd, req->offset, req->length); break;
323			#else
324			case REQ_READAHEAD: req->result = -1; errno = ENOSYS; break;
325			#endif
326
327			case REQ_STAT: req->result = stat (req->dataptr, req->statdata); break;
328			case REQ_LSTAT: req->result = lstat (req->dataptr, req->statdata); break;
329			case REQ_FSTAT: req->result = fstat (req->fd , req->statdata); break;
330
331			case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
332			case REQ_CLOSE: req->result = close (req->fd); break;
333			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
334
335			case REQ_FSYNC: req->result = fsync (req->fd); break;
336			case REQ_FDATASYNC: req->result = fdatasync (req->fd); break;
337
338			case REQ_QUIT:
339	root	1.3	break;
340	root	1.1
341			default:
342			req->result = ENOSYS;
343			break;
344			}
345
346			req->errorno = errno;
347	root	1.3
348			pthread_mutex_lock (&reslock);
349
350			req->next = 0;
351
352			if (rese)
353			{
354			rese->next = req;
355			rese = req;
356			}
357			else
358			{
359			rese = ress = req;
360
361			/* write a dummy byte to the pipe so fh becomes ready */
362			write (respipe [1], &respipe, 1);
363			}
364
365			pthread_mutex_unlock (&reslock);
366	root	1.1	}
367	root	1.3	while (type != REQ_QUIT);
368	root	1.1
369			return 0;
370			}
371
372			MODULE = IO::AIO PACKAGE = IO::AIO
373
374	root	1.8	PROTOTYPES: ENABLE
375
376	root	1.1	BOOT:
377			{
378	root	1.3	if (pipe (respipe))
379			croak ("unable to initialize result pipe");
380	root	1.1
381	root	1.3	if (fcntl (respipe [0], F_SETFL, O_NONBLOCK))
382	root	1.1	croak ("cannot set result pipe to nonblocking mode");
383
384	root	1.3	if (fcntl (respipe [1], F_SETFL, O_NONBLOCK))
385	root	1.1	croak ("cannot set result pipe to nonblocking mode");
386			}
387
388			void
389			min_parallel(nthreads)
390			int nthreads
391			PROTOTYPE: $
392			CODE:
393			while (nthreads > started)
394			start_thread ();
395
396			void
397			max_parallel(nthreads)
398			int nthreads
399			PROTOTYPE: $
400			CODE:
401			{
402			int cur = started;
403			while (cur > nthreads)
404			{
405			end_thread ();
406			cur--;
407			}
408
409			while (started > nthreads)
410			{
411			poll_wait ();
412	root	1.5	poll_cb ();
413	root	1.1	}
414			}
415
416	root	1.4	int
417			max_outstanding(nreqs)
418			int nreqs
419			PROTOTYPE: $
420			CODE:
421			RETVAL = max_outstanding;
422			max_outstanding = nreqs;
423
424	root	1.1	void
425	root	1.8	aio_open(pathname,flags,mode,callback=&PL_sv_undef)
426	root	1.1	SV * pathname
427			int flags
428			int mode
429			SV * callback
430	root	1.8	PROTOTYPE: $$$;$
431	root	1.1	CODE:
432			{
433			aio_req req;
434
435			Newz (0, req, 1, aio_cb);
436
437			if (!req)
438			croak ("out of memory during aio_req allocation");
439
440			req->type = REQ_OPEN;
441			req->data = newSVsv (pathname);
442			req->dataptr = SvPV_nolen (req->data);
443			req->fd = flags;
444			req->mode = mode;
445			req->callback = SvREFCNT_inc (callback);
446
447			send_req (req);
448			}
449
450			void
451	root	1.8	aio_close(fh,callback=&PL_sv_undef)
452	root	1.1	InputStream fh
453			SV * callback
454	root	1.8	PROTOTYPE: $;$
455	root	1.1	ALIAS:
456			aio_close = REQ_CLOSE
457			aio_fsync = REQ_FSYNC
458			aio_fdatasync = REQ_FDATASYNC
459			CODE:
460			{
461			aio_req req;
462
463			Newz (0, req, 1, aio_cb);
464
465			if (!req)
466			croak ("out of memory during aio_req allocation");
467
468			req->type = ix;
469			req->fd = PerlIO_fileno (fh);
470			req->callback = SvREFCNT_inc (callback);
471
472			send_req (req);
473			}
474
475			void
476	root	1.8	aio_read(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
477	root	1.1	InputStream fh
478			UV offset
479			IV length
480			SV * data
481			IV dataoffset
482			SV * callback
483	root	1.8	PROTOTYPE: $$$$$;$
484	root	1.1	CODE:
485	root	1.5	read_write (0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
486	root	1.1
487			void
488	root	1.8	aio_write(fh,offset,length,data,dataoffset,callback=&PL_sv_undef)
489	root	1.1	OutputStream fh
490			UV offset
491			IV length
492			SV * data
493			IV dataoffset
494			SV * callback
495	root	1.8	PROTOTYPE: $$$$$;$
496	root	1.1	CODE:
497	root	1.5	read_write (1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
498	root	1.1
499			void
500	root	1.8	aio_readahead(fh,offset,length,callback=&PL_sv_undef)
501	root	1.1	InputStream fh
502			UV offset
503			IV length
504			SV * callback
505	root	1.8	PROTOTYPE: $$$;$
506	root	1.1	CODE:
507			{
508			aio_req req;
509
510			if (length < 0)
511			croak ("length must not be negative");
512
513			Newz (0, req, 1, aio_cb);
514
515			if (!req)
516			croak ("out of memory during aio_req allocation");
517
518			req->type = REQ_READAHEAD;
519			req->fd = PerlIO_fileno (fh);
520			req->offset = offset;
521			req->length = length;
522			req->callback = SvREFCNT_inc (callback);
523
524			send_req (req);
525			}
526
527			void
528	root	1.8	aio_stat(fh_or_path,callback=&PL_sv_undef)
529	root	1.1	SV * fh_or_path
530			SV * callback
531			ALIAS:
532	root	1.8	aio_stat = REQ_STAT
533			aio_lstat = REQ_LSTAT
534	root	1.1	CODE:
535			{
536			aio_req req;
537
538			Newz (0, req, 1, aio_cb);
539
540			if (!req)
541			croak ("out of memory during aio_req allocation");
542
543			New (0, req->statdata, 1, Stat_t);
544
545			if (!req->statdata)
546			croak ("out of memory during aio_req->statdata allocation");
547
548			if (SvPOK (fh_or_path))
549			{
550	root	1.8	req->type = ix;
551	root	1.1	req->data = newSVsv (fh_or_path);
552			req->dataptr = SvPV_nolen (req->data);
553			}
554			else
555			{
556			req->type = REQ_FSTAT;
557			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
558			}
559
560			req->callback = SvREFCNT_inc (callback);
561
562			send_req (req);
563			}
564
565			void
566	root	1.8	aio_unlink(pathname,callback=&PL_sv_undef)
567	root	1.1	SV * pathname
568			SV * callback
569			CODE:
570			{
571			aio_req req;
572
573			Newz (0, req, 1, aio_cb);
574
575			if (!req)
576			croak ("out of memory during aio_req allocation");
577
578			req->type = REQ_UNLINK;
579			req->data = newSVsv (pathname);
580			req->dataptr = SvPV_nolen (req->data);
581			req->callback = SvREFCNT_inc (callback);
582
583			send_req (req);
584			}
585
586	root	1.6	void
587			flush()
588			PROTOTYPE:
589			CODE:
590			while (nreqs)
591			{
592			poll_wait ();
593			poll_cb ();
594			}
595
596	root	1.7	void
597			poll()
598			PROTOTYPE:
599			CODE:
600			if (nreqs)
601			{
602			poll_wait ();
603			poll_cb ();
604			}
605
606	root	1.1	int
607			poll_fileno()
608			PROTOTYPE:
609			CODE:
610	root	1.3	RETVAL = respipe [0];
611	root	1.1	OUTPUT:
612			RETVAL
613
614			int
615			poll_cb(...)
616			PROTOTYPE:
617			CODE:
618	root	1.5	RETVAL = poll_cb ();
619	root	1.1	OUTPUT:
620			RETVAL
621
622			void
623			poll_wait()
624			PROTOTYPE:
625			CODE:
626	root	1.3	if (nreqs)
627			poll_wait ();
628	root	1.1
629			int
630			nreqs()
631			PROTOTYPE:
632			CODE:
633			RETVAL = nreqs;
634			OUTPUT:
635			RETVAL
636