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>
#include <endian.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 __i386 || __amd64
# define STACKSIZE ( 256 * sizeof (long))
#elif __ia64
# define STACKSIZE (8192 * sizeof (long))
#else
# define STACKSIZE ( 512 * sizeof (long))
#endif

enum {
  REQ_QUIT,
  REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE,
  REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK
};

typedef struct {
  char stack[STACKSIZE];
} aio_thread;

typedef struct aio_cb {
  struct aio_cb *next;

  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;

  Stat_t *statdata;
} aio_cb;

typedef aio_cb *aio_req;

static int started;
static int nreqs;
static int reqpipe[2], respipe[2];

static aio_req qs, qe; /* queue start, queue end */

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 - 16]),
             CLONE_VM|CLONE_FS|CLONE_FILES,
             thr) >= 0)
    started++;
  else
    Safefree (thr);
}

static void
send_reqs (void)
{
  /* this write is atomic */
  while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
   {
     qs = qs->next;
     if (!qs) qe = 0;
   }
}

static void
send_req (aio_req req)
{
  nreqs++;
  req->next = 0;

  if (qe)
    {
      qe->next = req;
      qe = req;
    }
  else
    qe = qs = req;

  send_reqs ();
}

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
poll_wait ()
{
  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;

  while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
    {
      nreqs--;

      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   = *(req->statdata);

              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;
          count++;
        }

      Safefree (req);
    }

  if (qs)
    send_reqs ();

  return count;
}

static sigset_t fullsigset;

#undef errno
#include <asm/unistd.h>
#include <linux/types.h>
#include <sys/prctl.h>

#if BYTE_ORDER == LITTLE_ENDIAN
# define LONG_LONG_PAIR(HI, LO) LO, HI
#elif BYTE_ORDER == BIG_ENDIAN
# define LONG_LONG_PAIR(HI, LO) HI, LO
#endif

#if __alpha || __ia64 || __hppa || __v850__
# define stat kernelstat
# define stat64 kernelstat64
# include <asm/stat.h>
# undef stat
# undef stat64
#else
# define kernelstat stat
# define kernelstat64 stat64
#endif

#define COPY_STATDATA   \
  req->statdata->st_dev     = statdata.st_dev;          \
  req->statdata->st_ino     = statdata.st_ino;          \
  req->statdata->st_mode    = statdata.st_mode;         \
  req->statdata->st_nlink   = statdata.st_nlink;        \
  req->statdata->st_uid     = statdata.st_uid;          \
  req->statdata->st_gid     = statdata.st_gid;          \
  req->statdata->st_rdev    = statdata.st_rdev;         \
  req->statdata->st_size    = statdata.st_size;         \
  req->statdata->st_atime   = statdata.st_atime;        \
  req->statdata->st_mtime   = statdata.st_mtime;        \
  req->statdata->st_ctime   = statdata.st_ctime;        \
  req->statdata->st_blksize = statdata.st_blksize;      \
  req->statdata->st_blocks  = statdata.st_blocks;       \

static int
aio_proc (void *thr_arg)
{
  aio_thread *thr = thr_arg;
  aio_req req;
  int errno;

  /* this is very much kernel-specific :(:(:( */
  /* we rely on gcc's ability to create closures. */
  _syscall3(__kernel_size_t,read,unsigned int,fd,char *,buf,__kernel_size_t,count)
  _syscall3(__kernel_size_t,write,unsigned int,fd,char *,buf,__kernel_size_t,count)

  _syscall3(int,open,char *,pathname,int,flags,int,mode)
  _syscall1(int,close,unsigned int,fd)

#ifndef __NR_pread64
# define __NR_pread64 __NR_pread
# define __NR_pwrite64 __NR_write
#endif
  _syscall5(__kernel_ssize_t,pread64,unsigned int,fd,char *,buf,__kernel_size_t,count,unsigned int,offset_lh,unsigned int,offset_hl)
  _syscall5(__kernel_ssize_t,pwrite64,unsigned int,fd,char *,buf,__kernel_size_t,count,unsigned int,offset_lh,unsigned int,offset_hl)

#if __NR_stat64
  _syscall2(int,stat64, const char *, filename, struct kernelstat64 *, buf)
  _syscall2(int,lstat64, const char *, filename, struct kernelstat64 *, buf)
  _syscall2(int,fstat64, int, fd, struct kernelstat64 *, buf)
#elif __NR_stat
  _syscall2(int,stat, const char *, filename, struct kernelstat *, buf)
  _syscall2(int,lstat, const char *, filename, struct kernelstat *, buf)
  _syscall2(int,fstat, int, fd, struct kernelstat *, buf)
#else
# error "neither stat64 nor stat defined"
#endif

  _syscall1(int,unlink, char *, filename);

  sigprocmask (SIG_SETMASK, &fullsigset, 0);
  prctl (PR_SET_PDEATHSIG, SIGKILL);

  /* then loop */
  while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
    {
      req->thread = thr;
      errno = 0; /* strictly unnecessary */

      switch (req->type)
        {
          case REQ_READ:   req->result = pread64 (req->fd, req->dataptr, req->length,
                                                  LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break;
          case REQ_WRITE:  req->result = pwrite64(req->fd, req->dataptr, req->length,
                                                  LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break;
#if __NR_stat64
          struct kernelstat64 statdata;
          case REQ_STAT:   req->result = stat64  (req->dataptr, &statdata); COPY_STATDATA; break;
          case REQ_LSTAT:  req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
          case REQ_FSTAT:  req->result = fstat64 (req->fd, &statdata);      COPY_STATDATA; break;
#else
          struct kernelstat statdata;
          case REQ_STAT:   req->result = stat    (req->dataptr, &statdata); COPY_STATDATA; break;
          case REQ_LSTAT:  req->result = lstat   (req->dataptr, &statdata); COPY_STATDATA; break;
          case REQ_FSTAT:  req->result = fstat   (req->fd, &statdata);      COPY_STATDATA; break;
#endif
          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_QUIT:
          default:
            write (respipe[1], (void *)&req, sizeof (req));
            return 0;
        }

      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 (reqpipe[1], F_SETFL, O_NONBLOCK))
          croak ("cannot set result pipe to nonblocking mode");

        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)
          {
            poll_wait ();
            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, 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:
        poll_wait ();

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

Revision:	1.28
Committed:	Sat Jul 9 04:02:54 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.27:	+10 -18 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.17	#define PERL_NO_GET_CONTEXT
2
3	root	1.1	#include "EXTERN.h"
4			#include "perl.h"
5			#include "XSUB.h"
6
7			#include <sys/types.h>
8	root	1.13	#include <sys/stat.h>
9	root	1.1	#include <unistd.h>
10	root	1.5	#include <fcntl.h>
11	root	1.8	#include <signal.h>
12	root	1.1	#include <sched.h>
13	root	1.26	#include <endian.h>
14	root	1.1
15	root	1.21	typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
16	root	1.13	typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
17	root	1.21	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
18	root	1.16
19	root	1.27	#if __i386 \|\| __amd64
20			# define STACKSIZE ( 256 * sizeof (long))
21			#elif __ia64
22			# define STACKSIZE (8192 * sizeof (long))
23			#else
24			# define STACKSIZE ( 512 * sizeof (long))
25			#endif
26	root	1.1
27	root	1.20	enum {
28			REQ_QUIT,
29			REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE,
30			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK
31			};
32	root	1.1
33			typedef struct {
34			char stack[STACKSIZE];
35			} aio_thread;
36
37	root	1.18	typedef struct aio_cb {
38			struct aio_cb *next;
39
40	root	1.1	int type;
41			aio_thread *thread;
42
43			int fd;
44			off_t offset;
45			size_t length;
46	root	1.2	ssize_t result;
47	root	1.8	mode_t mode; /* open */
48	root	1.1	int errorno;
49	root	1.5	SV data, callback;
50	root	1.1	void *dataptr;
51	root	1.2	STRLEN dataoffset;
52	root	1.13
53	root	1.21	Stat_t *statdata;
54	root	1.1	} aio_cb;
55
56			typedef aio_cb *aio_req;
57
58			static int started;
59	root	1.5	static int nreqs;
60	root	1.1	static int reqpipe[2], respipe[2];
61
62	root	1.18	static aio_req qs, qe; /* queue start, queue end */
63
64	root	1.2	static int aio_proc(void *arg);
65
66	root	1.1	static void
67	root	1.18	start_thread (void)
68	root	1.1	{
69	root	1.2	aio_thread *thr;
70
71			New (0, thr, 1, aio_thread);
72
73			if (clone (aio_proc,
74	root	1.27	&(thr->stack[STACKSIZE - 16]),
75	root	1.20	CLONE_VM\|CLONE_FS\|CLONE_FILES,
76	root	1.2	thr) >= 0)
77			started++;
78			else
79			Safefree (thr);
80	root	1.1	}
81
82			static void
83	root	1.18	send_reqs (void)
84	root	1.1	{
85	root	1.18	/* this write is atomic */
86			while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
87			{
88			qs = qs->next;
89			if (!qs) qe = 0;
90			}
91	root	1.2	}
92
93			static void
94	root	1.8	send_req (aio_req req)
95			{
96			nreqs++;
97	root	1.18	req->next = 0;
98
99			if (qe)
100	root	1.22	{
101			qe->next = req;
102			qe = req;
103			}
104	root	1.18	else
105			qe = qs = req;
106
107			send_reqs ();
108			}
109
110			static void
111			end_thread (void)
112			{
113			aio_req req;
114			New (0, req, 1, aio_cb);
115			req->type = REQ_QUIT;
116
117			send_req (req);
118	root	1.8	}
119
120			static void
121	root	1.17	read_write (pTHX_
122			int dowrite, int fd, off_t offset, size_t length,
123	root	1.18	SV data, STRLEN dataoffset, SV callback)
124	root	1.2	{
125	root	1.5	aio_req req;
126			STRLEN svlen;
127			char *svptr = SvPV (data, svlen);
128
129	root	1.13	SvUPGRADE (data, SVt_PV);
130			SvPOK_on (data);
131
132	root	1.5	if (dataoffset < 0)
133			dataoffset += svlen;
134
135			if (dataoffset < 0 \|\| dataoffset > svlen)
136			croak ("data offset outside of string");
137
138			if (dowrite)
139			{
140			/* write: check length and adjust. */
141			if (length < 0 \|\| length + dataoffset > svlen)
142			length = svlen - dataoffset;
143			}
144			else
145			{
146			/* read: grow scalar as necessary */
147			svptr = SvGROW (data, length + dataoffset);
148			}
149
150			if (length < 0)
151			croak ("length must not be negative");
152
153	root	1.14	Newz (0, req, 1, aio_cb);
154	root	1.5
155			if (!req)
156			croak ("out of memory during aio_req allocation");
157
158			req->type = dowrite ? REQ_WRITE : REQ_READ;
159			req->fd = fd;
160			req->offset = offset;
161			req->length = length;
162			req->data = SvREFCNT_inc (data);
163	root	1.6	req->dataptr = (char *)svptr + dataoffset;
164	root	1.5	req->callback = SvREFCNT_inc (callback);
165
166	root	1.8	send_req (req);
167	root	1.5	}
168
169	root	1.22	static void
170			poll_wait ()
171			{
172			fd_set rfd;
173			FD_ZERO(&rfd);
174			FD_SET(respipe[0], &rfd);
175
176			select (respipe[0] + 1, &rfd, 0, 0, 0);
177			}
178
179	root	1.5	static int
180			poll_cb (pTHX)
181			{
182			dSP;
183			int count = 0;
184			aio_req req;
185
186			while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
187			{
188	root	1.22	nreqs--;
189
190	root	1.5	if (req->type == REQ_QUIT)
191			{
192			Safefree (req->thread);
193			started--;
194			}
195			else
196			{
197			int errorno = errno;
198			errno = req->errorno;
199
200			if (req->type == REQ_READ)
201	root	1.6	SvCUR_set (req->data, req->dataoffset
202			+ req->result > 0 ? req->result : 0);
203	root	1.5
204	root	1.14	if (req->data)
205			SvREFCNT_dec (req->data);
206
207	root	1.13	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
208			{
209	root	1.21	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
210			PL_laststatval = req->result;
211			PL_statcache = *(req->statdata);
212	root	1.13
213			Safefree (req->statdata);
214			}
215
216	root	1.5	PUSHMARK (SP);
217			XPUSHs (sv_2mortal (newSViv (req->result)));
218			PUTBACK;
219			call_sv (req->callback, G_VOID);
220			SPAGAIN;
221
222	root	1.14	if (req->callback)
223			SvREFCNT_dec (req->callback);
224	root	1.5
225			errno = errorno;
226			count++;
227			}
228
229			Safefree (req);
230			}
231
232	root	1.18	if (qs)
233			send_reqs ();
234
235	root	1.5	return count;
236	root	1.2	}
237
238	root	1.8	static sigset_t fullsigset;
239
240	root	1.2	#undef errno
241			#include <asm/unistd.h>
242	root	1.28	#include <linux/types.h>
243	root	1.20	#include <sys/prctl.h>
244	root	1.2
245	root	1.26	#if BYTE_ORDER == LITTLE_ENDIAN
246			# define LONG_LONG_PAIR(HI, LO) LO, HI
247			#elif BYTE_ORDER == BIG_ENDIAN
248			# define LONG_LONG_PAIR(HI, LO) HI, LO
249			#endif
250
251			#if __alpha \|\| __ia64 \|\| __hppa \|\| __v850__
252	root	1.25	# define stat kernelstat
253			# define stat64 kernelstat64
254			# include <asm/stat.h>
255			# undef stat
256			# undef stat64
257			#else
258			# define kernelstat stat
259			# define kernelstat64 stat64
260			#endif
261
262	root	1.21	#define COPY_STATDATA \
263			req->statdata->st_dev = statdata.st_dev; \
264			req->statdata->st_ino = statdata.st_ino; \
265			req->statdata->st_mode = statdata.st_mode; \
266			req->statdata->st_nlink = statdata.st_nlink; \
267			req->statdata->st_uid = statdata.st_uid; \
268			req->statdata->st_gid = statdata.st_gid; \
269			req->statdata->st_rdev = statdata.st_rdev; \
270			req->statdata->st_size = statdata.st_size; \
271			req->statdata->st_atime = statdata.st_atime; \
272			req->statdata->st_mtime = statdata.st_mtime; \
273			req->statdata->st_ctime = statdata.st_ctime; \
274			req->statdata->st_blksize = statdata.st_blksize; \
275			req->statdata->st_blocks = statdata.st_blocks; \
276
277	root	1.2	static int
278	root	1.18	aio_proc (void *thr_arg)
279	root	1.2	{
280			aio_thread *thr = thr_arg;
281	root	1.9	aio_req req;
282	root	1.2	int errno;
283
284	root	1.21	/* this is very much kernel-specific :(:(:( */
285	root	1.11	/* we rely on gcc's ability to create closures. */
286	root	1.28	_syscall3(__kernel_size_t,read,unsigned int,fd,char *,buf,__kernel_size_t,count)
287			_syscall3(__kernel_size_t,write,unsigned int,fd,char *,buf,__kernel_size_t,count)
288	root	1.13
289	root	1.28	_syscall3(int,open,char *,pathname,int,flags,int,mode)
290			_syscall1(int,close,unsigned int,fd)
291	root	1.11
292	root	1.28	#ifndef __NR_pread64
293			# define __NR_pread64 __NR_pread
294			# define __NR_pwrite64 __NR_write
295	root	1.21	#endif
296	root	1.28	_syscall5(__kernel_ssize_t,pread64,unsigned int,fd,char *,buf,__kernel_size_t,count,unsigned int,offset_lh,unsigned int,offset_hl)
297			_syscall5(__kernel_ssize_t,pwrite64,unsigned int,fd,char *,buf,__kernel_size_t,count,unsigned int,offset_lh,unsigned int,offset_hl)
298	root	1.21
299	root	1.25	#if __NR_stat64
300			_syscall2(int,stat64, const char , filename, struct kernelstat64 , buf)
301			_syscall2(int,lstat64, const char , filename, struct kernelstat64 , buf)
302			_syscall2(int,fstat64, int, fd, struct kernelstat64 *, buf)
303	root	1.21	#elif __NR_stat
304	root	1.25	_syscall2(int,stat, const char , filename, struct kernelstat , buf)
305			_syscall2(int,lstat, const char , filename, struct kernelstat , buf)
306			_syscall2(int,fstat, int, fd, struct kernelstat *, buf)
307	root	1.21	#else
308			# error "neither stat64 nor stat defined"
309			#endif
310	root	1.13
311	root	1.20	_syscall1(int,unlink, char *, filename);
312
313	root	1.8	sigprocmask (SIG_SETMASK, &fullsigset, 0);
314	root	1.20	prctl (PR_SET_PDEATHSIG, SIGKILL);
315	root	1.2
316			/* then loop */
317			while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
318			{
319			req->thread = thr;
320	root	1.14	errno = 0; /* strictly unnecessary */
321	root	1.2
322	root	1.18	switch (req->type)
323	root	1.2	{
324	root	1.26	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length,
325			LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break;
326			case REQ_WRITE: req->result = pwrite64(req->fd, req->dataptr, req->length,
327			LONG_LONG_PAIR (req->offset >> 32, req->offset & 0xffffffff)); break;
328	root	1.25	#if __NR_stat64
329			struct kernelstat64 statdata;
330	root	1.21	case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
331			case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
332			case REQ_FSTAT: req->result = fstat64 (req->fd, &statdata); COPY_STATDATA; break;
333			#else
334	root	1.25	struct kernelstat statdata;
335	root	1.21	case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break;
336			case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break;
337			case REQ_FSTAT: req->result = fstat (req->fd, &statdata); COPY_STATDATA; break;
338			#endif
339	root	1.20	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
340			case REQ_CLOSE: req->result = close (req->fd); break;
341			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
342	root	1.18
343			case REQ_QUIT:
344			default:
345			write (respipe[1], (void *)&req, sizeof (req));
346			return 0;
347	root	1.2	}
348
349	root	1.8	req->errorno = errno;
350	root	1.2	write (respipe[1], (void *)&req, sizeof (req));
351			}
352
353			return 0;
354	root	1.1	}
355
356			MODULE = Linux::AIO PACKAGE = Linux::AIO
357
358			BOOT:
359			{
360	root	1.8	sigfillset (&fullsigset);
361	root	1.9	sigdelset (&fullsigset, SIGTERM);
362			sigdelset (&fullsigset, SIGQUIT);
363			sigdelset (&fullsigset, SIGABRT);
364			sigdelset (&fullsigset, SIGINT);
365	root	1.8
366	root	1.1	if (pipe (reqpipe) \|\| pipe (respipe))
367			croak ("unable to initialize request or result pipe");
368	root	1.18
369			if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))
370			croak ("cannot set result pipe to nonblocking mode");
371	root	1.5
372			if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
373			croak ("cannot set result pipe to nonblocking mode");
374	root	1.1	}
375
376			void
377			min_parallel(nthreads)
378			int nthreads
379	root	1.5	PROTOTYPE: $
380	root	1.1	CODE:
381			while (nthreads > started)
382			start_thread ();
383
384			void
385			max_parallel(nthreads)
386			int nthreads
387	root	1.5	PROTOTYPE: $
388	root	1.1	CODE:
389	root	1.5	int cur = started;
390			while (cur > nthreads)
391			{
392			end_thread ();
393			cur--;
394			}
395
396	root	1.1	while (started > nthreads)
397	root	1.5	{
398	root	1.22	poll_wait ();
399	root	1.17	poll_cb (aTHX);
400	root	1.5	}
401	root	1.1
402			void
403	root	1.8	aio_open(pathname,flags,mode,callback)
404	root	1.13	SV * pathname
405	root	1.8	int flags
406			int mode
407			SV * callback
408			PROTOTYPE: $$$$
409			CODE:
410			aio_req req;
411
412	root	1.14	Newz (0, req, 1, aio_cb);
413	root	1.8
414			if (!req)
415			croak ("out of memory during aio_req allocation");
416
417			req->type = REQ_OPEN;
418	root	1.14	req->data = newSVsv (pathname);
419			req->dataptr = SvPV_nolen (req->data);
420	root	1.8	req->fd = flags;
421			req->mode = mode;
422	root	1.10	req->callback = SvREFCNT_inc (callback);
423
424			send_req (req);
425
426			void
427			aio_close(fh,callback)
428	root	1.13	InputStream fh
429	root	1.10	SV * callback
430	root	1.14	PROTOTYPE: $$
431	root	1.10	CODE:
432			aio_req req;
433
434	root	1.14	Newz (0, req, 1, aio_cb);
435	root	1.10
436			if (!req)
437			croak ("out of memory during aio_req allocation");
438
439			req->type = REQ_CLOSE;
440			req->fd = PerlIO_fileno (fh);
441	root	1.13	req->callback = SvREFCNT_inc (callback);
442
443			send_req (req);
444
445			void
446			aio_read(fh,offset,length,data,dataoffset,callback)
447			InputStream fh
448			UV offset
449			IV length
450			SV * data
451			IV dataoffset
452			SV * callback
453			PROTOTYPE: $$$$$$
454			CODE:
455			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
456
457			void
458			aio_write(fh,offset,length,data,dataoffset,callback)
459			OutputStream fh
460			UV offset
461			IV length
462			SV * data
463			IV dataoffset
464			SV * callback
465			PROTOTYPE: $$$$$$
466			CODE:
467			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
468
469			void
470			aio_stat(fh_or_path,callback)
471			SV * fh_or_path
472			SV * callback
473			PROTOTYPE: $$
474			ALIAS:
475			aio_lstat = 1
476			CODE:
477			aio_req req;
478
479	root	1.14	Newz (0, req, 1, aio_cb);
480	root	1.13
481			if (!req)
482			croak ("out of memory during aio_req allocation");
483
484	root	1.21	New (0, req->statdata, 1, Stat_t);
485	root	1.13
486			if (!req->statdata)
487			croak ("out of memory during aio_req->statdata allocation");
488
489			if (SvPOK (fh_or_path))
490			{
491			req->type = ix ? REQ_LSTAT : REQ_STAT;
492	root	1.14	req->data = newSVsv (fh_or_path);
493			req->dataptr = SvPV_nolen (req->data);
494	root	1.13	}
495			else
496			{
497			req->type = REQ_FSTAT;
498			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
499			}
500
501	root	1.8	req->callback = SvREFCNT_inc (callback);
502
503			send_req (req);
504	root	1.20
505			void
506			aio_unlink(pathname,callback)
507			SV * pathname
508			SV * callback
509			PROTOTYPE: $$
510			CODE:
511			aio_req req;
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_UNLINK;
519			req->data = newSVsv (pathname);
520			req->dataptr = SvPV_nolen (req->data);
521			req->callback = SvREFCNT_inc (callback);
522
523			send_req (req);
524	root	1.5
525			int
526			poll_fileno()
527			PROTOTYPE:
528			CODE:
529			RETVAL = respipe[0];
530			OUTPUT:
531			RETVAL
532
533			int
534	root	1.6	poll_cb(...)
535	root	1.5	PROTOTYPE:
536			CODE:
537			RETVAL = poll_cb (aTHX);
538			OUTPUT:
539			RETVAL
540
541	root	1.23	void
542			poll_wait()
543			PROTOTYPE:
544			CODE:
545			poll_wait ();
546
547	root	1.5	int
548			nreqs()
549			PROTOTYPE:
550			CODE:
551			RETVAL = nreqs;
552			OUTPUT:
553			RETVAL
554