Linux-AIO/AIO.xs

#define PERL_NO_GET_CONTEXT

#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"

#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <signal.h>
#include <sched.h>

typedef void *InputStream;  /* hack, but 5.6.1 is simply toooo old ;) */
typedef void *OutputStream; /* hack, but 5.6.1 is simply toooo old ;) */
typedef void *InOutStream;  /* hack, but 5.6.1 is simply toooo old ;) */

// 128 seems to be enough most everywhere. alpha needs 256.
#define STACKSIZE (256 * sizeof (long))

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 - sizeof (long)]),
             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 <sys/prctl.h>

#if __alpha || __ia64 || __hppa || __sparc64__ || __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(int,read,int,fd,char *,buf,size_t,count)
  _syscall3(int,write,int,fd,char *,buf,size_t,count)

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

#if __NR_pread64
  _syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
  _syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
#elif __NR_pread
  _syscall4(int,pread,int,fd,char *,buf,size_t,count,offset_t,offset)
  _syscall4(int,pwrite,int,fd,char *,buf,size_t,count,offset_t,offset)
#else
# error "neither pread nor pread64 defined"
#endif


#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)
        {
#if __NR_pread64
          case REQ_READ:   req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
          case REQ_WRITE:  req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
#else
          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;
#endif
#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:	1.25
Committed:	Thu Jul 7 22:24:09 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.24:	+25 -15 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
14	root	1.21	typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
15	root	1.13	typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
16	root	1.21	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
17	root	1.16
18	root	1.25	// 128 seems to be enough most everywhere. alpha needs 256.
19			#define STACKSIZE (256 * sizeof (long))
20	root	1.1
21	root	1.20	enum {
22			REQ_QUIT,
23			REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE,
24			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK
25			};
26	root	1.1
27			typedef struct {
28			char stack[STACKSIZE];
29			} aio_thread;
30
31	root	1.18	typedef struct aio_cb {
32			struct aio_cb *next;
33
34	root	1.1	int type;
35			aio_thread *thread;
36
37			int fd;
38			off_t offset;
39			size_t length;
40	root	1.2	ssize_t result;
41	root	1.8	mode_t mode; /* open */
42	root	1.1	int errorno;
43	root	1.5	SV data, callback;
44	root	1.1	void *dataptr;
45	root	1.2	STRLEN dataoffset;
46	root	1.13
47	root	1.21	Stat_t *statdata;
48	root	1.1	} aio_cb;
49
50			typedef aio_cb *aio_req;
51
52			static int started;
53	root	1.5	static int nreqs;
54	root	1.1	static int reqpipe[2], respipe[2];
55
56	root	1.18	static aio_req qs, qe; /* queue start, queue end */
57
58	root	1.2	static int aio_proc(void *arg);
59
60	root	1.1	static void
61	root	1.18	start_thread (void)
62	root	1.1	{
63	root	1.2	aio_thread *thr;
64
65			New (0, thr, 1, aio_thread);
66
67			if (clone (aio_proc,
68	root	1.22	&(thr->stack[STACKSIZE - sizeof (long)]),
69	root	1.20	CLONE_VM\|CLONE_FS\|CLONE_FILES,
70	root	1.2	thr) >= 0)
71			started++;
72			else
73			Safefree (thr);
74	root	1.1	}
75
76			static void
77	root	1.18	send_reqs (void)
78	root	1.1	{
79	root	1.18	/* this write is atomic */
80			while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
81			{
82			qs = qs->next;
83			if (!qs) qe = 0;
84			}
85	root	1.2	}
86
87			static void
88	root	1.8	send_req (aio_req req)
89			{
90			nreqs++;
91	root	1.18	req->next = 0;
92
93			if (qe)
94	root	1.22	{
95			qe->next = req;
96			qe = req;
97			}
98	root	1.18	else
99			qe = qs = req;
100
101			send_reqs ();
102			}
103
104			static void
105			end_thread (void)
106			{
107			aio_req req;
108			New (0, req, 1, aio_cb);
109			req->type = REQ_QUIT;
110
111			send_req (req);
112	root	1.8	}
113
114			static void
115	root	1.17	read_write (pTHX_
116			int dowrite, int fd, off_t offset, size_t length,
117	root	1.18	SV data, STRLEN dataoffset, SV callback)
118	root	1.2	{
119	root	1.5	aio_req req;
120			STRLEN svlen;
121			char *svptr = SvPV (data, svlen);
122
123	root	1.13	SvUPGRADE (data, SVt_PV);
124			SvPOK_on (data);
125
126	root	1.5	if (dataoffset < 0)
127			dataoffset += svlen;
128
129			if (dataoffset < 0 \|\| dataoffset > svlen)
130			croak ("data offset outside of string");
131
132			if (dowrite)
133			{
134			/* write: check length and adjust. */
135			if (length < 0 \|\| length + dataoffset > svlen)
136			length = svlen - dataoffset;
137			}
138			else
139			{
140			/* read: grow scalar as necessary */
141			svptr = SvGROW (data, length + dataoffset);
142			}
143
144			if (length < 0)
145			croak ("length must not be negative");
146
147	root	1.14	Newz (0, req, 1, aio_cb);
148	root	1.5
149			if (!req)
150			croak ("out of memory during aio_req allocation");
151
152			req->type = dowrite ? REQ_WRITE : REQ_READ;
153			req->fd = fd;
154			req->offset = offset;
155			req->length = length;
156			req->data = SvREFCNT_inc (data);
157	root	1.6	req->dataptr = (char *)svptr + dataoffset;
158	root	1.5	req->callback = SvREFCNT_inc (callback);
159
160	root	1.8	send_req (req);
161	root	1.5	}
162
163	root	1.22	static void
164			poll_wait ()
165			{
166			fd_set rfd;
167			FD_ZERO(&rfd);
168			FD_SET(respipe[0], &rfd);
169
170			select (respipe[0] + 1, &rfd, 0, 0, 0);
171			}
172
173	root	1.5	static int
174			poll_cb (pTHX)
175			{
176			dSP;
177			int count = 0;
178			aio_req req;
179
180			while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
181			{
182	root	1.22	nreqs--;
183
184	root	1.5	if (req->type == REQ_QUIT)
185			{
186			Safefree (req->thread);
187			started--;
188			}
189			else
190			{
191			int errorno = errno;
192			errno = req->errorno;
193
194			if (req->type == REQ_READ)
195	root	1.6	SvCUR_set (req->data, req->dataoffset
196			+ req->result > 0 ? req->result : 0);
197	root	1.5
198	root	1.14	if (req->data)
199			SvREFCNT_dec (req->data);
200
201	root	1.13	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
202			{
203	root	1.21	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
204			PL_laststatval = req->result;
205			PL_statcache = *(req->statdata);
206	root	1.13
207			Safefree (req->statdata);
208			}
209
210	root	1.5	PUSHMARK (SP);
211			XPUSHs (sv_2mortal (newSViv (req->result)));
212			PUTBACK;
213			call_sv (req->callback, G_VOID);
214			SPAGAIN;
215
216	root	1.14	if (req->callback)
217			SvREFCNT_dec (req->callback);
218	root	1.5
219			errno = errorno;
220			count++;
221			}
222
223			Safefree (req);
224			}
225
226	root	1.18	if (qs)
227			send_reqs ();
228
229	root	1.5	return count;
230	root	1.2	}
231
232	root	1.8	static sigset_t fullsigset;
233
234	root	1.2	#undef errno
235			#include <asm/unistd.h>
236	root	1.20	#include <sys/prctl.h>
237	root	1.2
238	root	1.25	#if __alpha \|\| __ia64 \|\| __hppa \|\| __sparc64__ \|\| __v850__
239			# define stat kernelstat
240			# define stat64 kernelstat64
241			# include <asm/stat.h>
242			# undef stat
243			# undef stat64
244			#else
245			# define kernelstat stat
246			# define kernelstat64 stat64
247			#endif
248
249	root	1.21	#define COPY_STATDATA \
250			req->statdata->st_dev = statdata.st_dev; \
251			req->statdata->st_ino = statdata.st_ino; \
252			req->statdata->st_mode = statdata.st_mode; \
253			req->statdata->st_nlink = statdata.st_nlink; \
254			req->statdata->st_uid = statdata.st_uid; \
255			req->statdata->st_gid = statdata.st_gid; \
256			req->statdata->st_rdev = statdata.st_rdev; \
257			req->statdata->st_size = statdata.st_size; \
258			req->statdata->st_atime = statdata.st_atime; \
259			req->statdata->st_mtime = statdata.st_mtime; \
260			req->statdata->st_ctime = statdata.st_ctime; \
261			req->statdata->st_blksize = statdata.st_blksize; \
262			req->statdata->st_blocks = statdata.st_blocks; \
263
264	root	1.2	static int
265	root	1.18	aio_proc (void *thr_arg)
266	root	1.2	{
267			aio_thread *thr = thr_arg;
268	root	1.9	aio_req req;
269	root	1.2	int errno;
270
271	root	1.21	/* this is very much kernel-specific :(:(:( */
272	root	1.11	/* we rely on gcc's ability to create closures. */
273	root	1.13	_syscall3(int,read,int,fd,char *,buf,size_t,count)
274			_syscall3(int,write,int,fd,char *,buf,size_t,count)
275
276	root	1.11	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
277			_syscall1(int,close,int,fd)
278
279	root	1.25	#if __NR_pread64
280	root	1.16	_syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
281			_syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
282	root	1.21	#elif __NR_pread
283			_syscall4(int,pread,int,fd,char *,buf,size_t,count,offset_t,offset)
284			_syscall4(int,pwrite,int,fd,char *,buf,size_t,count,offset_t,offset)
285			#else
286			# error "neither pread nor pread64 defined"
287			#endif
288	root	1.13
289	root	1.21
290	root	1.25	#if __NR_stat64
291			_syscall2(int,stat64, const char , filename, struct kernelstat64 , buf)
292			_syscall2(int,lstat64, const char , filename, struct kernelstat64 , buf)
293			_syscall2(int,fstat64, int, fd, struct kernelstat64 *, buf)
294	root	1.21	#elif __NR_stat
295	root	1.25	_syscall2(int,stat, const char , filename, struct kernelstat , buf)
296			_syscall2(int,lstat, const char , filename, struct kernelstat , buf)
297			_syscall2(int,fstat, int, fd, struct kernelstat *, buf)
298	root	1.21	#else
299			# error "neither stat64 nor stat defined"
300			#endif
301	root	1.13
302	root	1.20	_syscall1(int,unlink, char *, filename);
303
304	root	1.8	sigprocmask (SIG_SETMASK, &fullsigset, 0);
305	root	1.20	prctl (PR_SET_PDEATHSIG, SIGKILL);
306	root	1.2
307			/* then loop */
308			while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
309			{
310			req->thread = thr;
311	root	1.14	errno = 0; /* strictly unnecessary */
312	root	1.2
313	root	1.18	switch (req->type)
314	root	1.2	{
315	root	1.25	#if __NR_pread64
316	root	1.20	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
317			case REQ_WRITE: req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
318	root	1.21	#else
319			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			#endif
322	root	1.25	#if __NR_stat64
323			struct kernelstat64 statdata;
324	root	1.21	case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
325			case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
326			case REQ_FSTAT: req->result = fstat64 (req->fd, &statdata); COPY_STATDATA; break;
327			#else
328	root	1.25	struct kernelstat statdata;
329	root	1.21	case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break;
330			case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break;
331			case REQ_FSTAT: req->result = fstat (req->fd, &statdata); COPY_STATDATA; break;
332			#endif
333	root	1.20	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
334			case REQ_CLOSE: req->result = close (req->fd); break;
335			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
336	root	1.18
337			case REQ_QUIT:
338			default:
339			write (respipe[1], (void *)&req, sizeof (req));
340			return 0;
341	root	1.2	}
342
343	root	1.8	req->errorno = errno;
344	root	1.2	write (respipe[1], (void *)&req, sizeof (req));
345			}
346
347			return 0;
348	root	1.1	}
349
350			MODULE = Linux::AIO PACKAGE = Linux::AIO
351
352			BOOT:
353			{
354	root	1.8	sigfillset (&fullsigset);
355	root	1.9	sigdelset (&fullsigset, SIGTERM);
356			sigdelset (&fullsigset, SIGQUIT);
357			sigdelset (&fullsigset, SIGABRT);
358			sigdelset (&fullsigset, SIGINT);
359	root	1.8
360	root	1.1	if (pipe (reqpipe) \|\| pipe (respipe))
361			croak ("unable to initialize request or result pipe");
362	root	1.18
363			if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))
364			croak ("cannot set result pipe to nonblocking mode");
365	root	1.5
366			if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
367			croak ("cannot set result pipe to nonblocking mode");
368	root	1.1	}
369
370			void
371			min_parallel(nthreads)
372			int nthreads
373	root	1.5	PROTOTYPE: $
374	root	1.1	CODE:
375			while (nthreads > started)
376			start_thread ();
377
378			void
379			max_parallel(nthreads)
380			int nthreads
381	root	1.5	PROTOTYPE: $
382	root	1.1	CODE:
383	root	1.5	int cur = started;
384			while (cur > nthreads)
385			{
386			end_thread ();
387			cur--;
388			}
389
390	root	1.1	while (started > nthreads)
391	root	1.5	{
392	root	1.22	poll_wait ();
393	root	1.17	poll_cb (aTHX);
394	root	1.5	}
395	root	1.1
396			void
397	root	1.8	aio_open(pathname,flags,mode,callback)
398	root	1.13	SV * pathname
399	root	1.8	int flags
400			int mode
401			SV * callback
402			PROTOTYPE: $$$$
403			CODE:
404			aio_req req;
405
406	root	1.14	Newz (0, req, 1, aio_cb);
407	root	1.8
408			if (!req)
409			croak ("out of memory during aio_req allocation");
410
411			req->type = REQ_OPEN;
412	root	1.14	req->data = newSVsv (pathname);
413			req->dataptr = SvPV_nolen (req->data);
414	root	1.8	req->fd = flags;
415			req->mode = mode;
416	root	1.10	req->callback = SvREFCNT_inc (callback);
417
418			send_req (req);
419
420			void
421			aio_close(fh,callback)
422	root	1.13	InputStream fh
423	root	1.10	SV * callback
424	root	1.14	PROTOTYPE: $$
425	root	1.10	CODE:
426			aio_req req;
427
428	root	1.14	Newz (0, req, 1, aio_cb);
429	root	1.10
430			if (!req)
431			croak ("out of memory during aio_req allocation");
432
433			req->type = REQ_CLOSE;
434			req->fd = PerlIO_fileno (fh);
435	root	1.13	req->callback = SvREFCNT_inc (callback);
436
437			send_req (req);
438
439			void
440			aio_read(fh,offset,length,data,dataoffset,callback)
441			InputStream fh
442			UV offset
443			IV length
444			SV * data
445			IV dataoffset
446			SV * callback
447			PROTOTYPE: $$$$$$
448			CODE:
449			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
450
451			void
452			aio_write(fh,offset,length,data,dataoffset,callback)
453			OutputStream fh
454			UV offset
455			IV length
456			SV * data
457			IV dataoffset
458			SV * callback
459			PROTOTYPE: $$$$$$
460			CODE:
461			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
462
463			void
464			aio_stat(fh_or_path,callback)
465			SV * fh_or_path
466			SV * callback
467			PROTOTYPE: $$
468			ALIAS:
469			aio_lstat = 1
470			CODE:
471			aio_req req;
472
473	root	1.14	Newz (0, req, 1, aio_cb);
474	root	1.13
475			if (!req)
476			croak ("out of memory during aio_req allocation");
477
478	root	1.21	New (0, req->statdata, 1, Stat_t);
479	root	1.13
480			if (!req->statdata)
481			croak ("out of memory during aio_req->statdata allocation");
482
483			if (SvPOK (fh_or_path))
484			{
485			req->type = ix ? REQ_LSTAT : REQ_STAT;
486	root	1.14	req->data = newSVsv (fh_or_path);
487			req->dataptr = SvPV_nolen (req->data);
488	root	1.13	}
489			else
490			{
491			req->type = REQ_FSTAT;
492			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
493			}
494
495	root	1.8	req->callback = SvREFCNT_inc (callback);
496
497			send_req (req);
498	root	1.20
499			void
500			aio_unlink(pathname,callback)
501			SV * pathname
502			SV * callback
503			PROTOTYPE: $$
504			CODE:
505			aio_req req;
506
507			Newz (0, req, 1, aio_cb);
508
509			if (!req)
510			croak ("out of memory during aio_req allocation");
511
512			req->type = REQ_UNLINK;
513			req->data = newSVsv (pathname);
514			req->dataptr = SvPV_nolen (req->data);
515			req->callback = SvREFCNT_inc (callback);
516
517			send_req (req);
518	root	1.5
519			int
520			poll_fileno()
521			PROTOTYPE:
522			CODE:
523			RETVAL = respipe[0];
524			OUTPUT:
525			RETVAL
526
527			int
528	root	1.6	poll_cb(...)
529	root	1.5	PROTOTYPE:
530			CODE:
531			RETVAL = poll_cb (aTHX);
532			OUTPUT:
533			RETVAL
534
535	root	1.23	void
536			poll_wait()
537			PROTOTYPE:
538			CODE:
539			poll_wait ();
540
541	root	1.5	int
542			nreqs()
543			PROTOTYPE:
544			CODE:
545			RETVAL = nreqs;
546			OUTPUT:
547			RETVAL
548