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 ;) */

#define STACKSIZE 1024 /* yeah */

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]),
             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;
  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 int
poll_cb (pTHX)
{
  dSP;
  int count = 0;
  aio_req req;

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

      Safefree (req);
    }

  if (qs)
    send_reqs ();

  return count;
}

static sigset_t fullsigset;

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

#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)

#ifdef __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


#ifdef __NR_stat64
  _syscall2(int,stat64, const char *, filename, struct stat64 *, buf)
  _syscall2(int,lstat64, const char *, filename, struct stat64 *, buf)
  _syscall2(int,fstat64, int, fd, struct stat64 *, buf)
#elif __NR_stat
  _syscall2(int,stat, const char *, filename, struct stat *, buf)
  _syscall2(int,lstat, const char *, filename, struct stat *, buf)
  _syscall2(int,fstat, int, fd, struct stat *, 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)
        {
#ifdef __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
#ifdef __NR_stat64
          struct stat64 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 stat 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)
          {
            fd_set rfd;
            FD_ZERO(&rfd);
            FD_SET(respipe[0], &rfd);

            select (respipe[0] + 1, &rfd, 0, 0, 0);
            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

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

Revision:	1.21
Committed:	Fri Aug 6 17:18:08 2004 UTC (19 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.20:	+55 -30 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	1.8	#define STACKSIZE 1024 /* yeah */
19	root	1.1
20	root	1.20	enum {
21			REQ_QUIT,
22			REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE,
23			REQ_STAT, REQ_LSTAT, REQ_FSTAT, REQ_UNLINK
24			};
25	root	1.1
26			typedef struct {
27			char stack[STACKSIZE];
28			} aio_thread;
29
30	root	1.18	typedef struct aio_cb {
31			struct aio_cb *next;
32
33	root	1.1	int type;
34			aio_thread *thread;
35
36			int fd;
37			off_t offset;
38			size_t length;
39	root	1.2	ssize_t result;
40	root	1.8	mode_t mode; /* open */
41	root	1.1	int errorno;
42	root	1.5	SV data, callback;
43	root	1.1	void *dataptr;
44	root	1.2	STRLEN dataoffset;
45	root	1.13
46	root	1.21	Stat_t *statdata;
47	root	1.1	} aio_cb;
48
49			typedef aio_cb *aio_req;
50
51			static int started;
52	root	1.5	static int nreqs;
53	root	1.1	static int reqpipe[2], respipe[2];
54
55	root	1.18	static aio_req qs, qe; /* queue start, queue end */
56
57	root	1.2	static int aio_proc(void *arg);
58
59	root	1.1	static void
60	root	1.18	start_thread (void)
61	root	1.1	{
62	root	1.2	aio_thread *thr;
63
64			New (0, thr, 1, aio_thread);
65
66			if (clone (aio_proc,
67			&(thr->stack[STACKSIZE]),
68	root	1.20	CLONE_VM\|CLONE_FS\|CLONE_FILES,
69	root	1.2	thr) >= 0)
70			started++;
71			else
72			Safefree (thr);
73	root	1.1	}
74
75			static void
76	root	1.18	send_reqs (void)
77	root	1.1	{
78	root	1.18	/* this write is atomic */
79			while (qs && write (reqpipe[1], &qs, sizeof qs) == sizeof qs)
80			{
81			qs = qs->next;
82			if (!qs) qe = 0;
83			}
84	root	1.2	}
85
86			static void
87	root	1.8	send_req (aio_req req)
88			{
89			nreqs++;
90	root	1.18	req->next = 0;
91
92			if (qe)
93			qe->next = req;
94			else
95			qe = qs = req;
96
97			send_reqs ();
98			}
99
100			static void
101			end_thread (void)
102			{
103			aio_req req;
104			New (0, req, 1, aio_cb);
105			req->type = REQ_QUIT;
106
107			send_req (req);
108	root	1.8	}
109
110			static void
111	root	1.17	read_write (pTHX_
112			int dowrite, int fd, off_t offset, size_t length,
113	root	1.18	SV data, STRLEN dataoffset, SV callback)
114	root	1.2	{
115	root	1.5	aio_req req;
116			STRLEN svlen;
117			char *svptr = SvPV (data, svlen);
118
119	root	1.13	SvUPGRADE (data, SVt_PV);
120			SvPOK_on (data);
121
122	root	1.5	if (dataoffset < 0)
123			dataoffset += svlen;
124
125			if (dataoffset < 0 \|\| dataoffset > svlen)
126			croak ("data offset outside of string");
127
128			if (dowrite)
129			{
130			/* write: check length and adjust. */
131			if (length < 0 \|\| length + dataoffset > svlen)
132			length = svlen - dataoffset;
133			}
134			else
135			{
136			/* read: grow scalar as necessary */
137			svptr = SvGROW (data, length + dataoffset);
138			}
139
140			if (length < 0)
141			croak ("length must not be negative");
142
143	root	1.14	Newz (0, req, 1, aio_cb);
144	root	1.5
145			if (!req)
146			croak ("out of memory during aio_req allocation");
147
148			req->type = dowrite ? REQ_WRITE : REQ_READ;
149			req->fd = fd;
150			req->offset = offset;
151			req->length = length;
152			req->data = SvREFCNT_inc (data);
153	root	1.6	req->dataptr = (char *)svptr + dataoffset;
154	root	1.5	req->callback = SvREFCNT_inc (callback);
155
156	root	1.8	send_req (req);
157	root	1.5	}
158
159			static int
160			poll_cb (pTHX)
161			{
162			dSP;
163			int count = 0;
164			aio_req req;
165
166			while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
167			{
168			if (req->type == REQ_QUIT)
169			{
170			Safefree (req->thread);
171			started--;
172			}
173			else
174			{
175			int errorno = errno;
176			errno = req->errorno;
177
178			if (req->type == REQ_READ)
179	root	1.6	SvCUR_set (req->data, req->dataoffset
180			+ req->result > 0 ? req->result : 0);
181	root	1.5
182	root	1.14	if (req->data)
183			SvREFCNT_dec (req->data);
184
185	root	1.13	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
186			{
187	root	1.21	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
188			PL_laststatval = req->result;
189			PL_statcache = *(req->statdata);
190	root	1.13
191			Safefree (req->statdata);
192			}
193
194	root	1.5	PUSHMARK (SP);
195			XPUSHs (sv_2mortal (newSViv (req->result)));
196			PUTBACK;
197			call_sv (req->callback, G_VOID);
198			SPAGAIN;
199
200	root	1.14	if (req->callback)
201			SvREFCNT_dec (req->callback);
202	root	1.5
203			errno = errorno;
204			nreqs--;
205			count++;
206			}
207
208			Safefree (req);
209			}
210
211	root	1.18	if (qs)
212			send_reqs ();
213
214	root	1.5	return count;
215	root	1.2	}
216
217	root	1.8	static sigset_t fullsigset;
218
219	root	1.2	#undef errno
220			#include <asm/unistd.h>
221	root	1.20	#include <sys/prctl.h>
222	root	1.2
223	root	1.21	#define COPY_STATDATA \
224			req->statdata->st_dev = statdata.st_dev; \
225			req->statdata->st_ino = statdata.st_ino; \
226			req->statdata->st_mode = statdata.st_mode; \
227			req->statdata->st_nlink = statdata.st_nlink; \
228			req->statdata->st_uid = statdata.st_uid; \
229			req->statdata->st_gid = statdata.st_gid; \
230			req->statdata->st_rdev = statdata.st_rdev; \
231			req->statdata->st_size = statdata.st_size; \
232			req->statdata->st_atime = statdata.st_atime; \
233			req->statdata->st_mtime = statdata.st_mtime; \
234			req->statdata->st_ctime = statdata.st_ctime; \
235			req->statdata->st_blksize = statdata.st_blksize; \
236			req->statdata->st_blocks = statdata.st_blocks; \
237
238	root	1.2	static int
239	root	1.18	aio_proc (void *thr_arg)
240	root	1.2	{
241			aio_thread *thr = thr_arg;
242	root	1.9	aio_req req;
243	root	1.2	int errno;
244
245	root	1.21	/* this is very much kernel-specific :(:(:( */
246	root	1.11	/* we rely on gcc's ability to create closures. */
247	root	1.13	_syscall3(int,read,int,fd,char *,buf,size_t,count)
248			_syscall3(int,write,int,fd,char *,buf,size_t,count)
249
250	root	1.11	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
251			_syscall1(int,close,int,fd)
252
253	root	1.21	#ifdef __NR_pread64
254	root	1.16	_syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
255			_syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
256	root	1.21	#elif __NR_pread
257			_syscall4(int,pread,int,fd,char *,buf,size_t,count,offset_t,offset)
258			_syscall4(int,pwrite,int,fd,char *,buf,size_t,count,offset_t,offset)
259			#else
260			# error "neither pread nor pread64 defined"
261			#endif
262	root	1.13
263	root	1.21
264			#ifdef __NR_stat64
265	root	1.13	_syscall2(int,stat64, const char , filename, struct stat64 , buf)
266			_syscall2(int,lstat64, const char , filename, struct stat64 , buf)
267			_syscall2(int,fstat64, int, fd, struct stat64 *, buf)
268	root	1.21	#elif __NR_stat
269			_syscall2(int,stat, const char , filename, struct stat , buf)
270			_syscall2(int,lstat, const char , filename, struct stat , buf)
271			_syscall2(int,fstat, int, fd, struct stat *, buf)
272			#else
273			# error "neither stat64 nor stat defined"
274			#endif
275	root	1.13
276	root	1.20	_syscall1(int,unlink, char *, filename);
277
278	root	1.8	sigprocmask (SIG_SETMASK, &fullsigset, 0);
279	root	1.20	prctl (PR_SET_PDEATHSIG, SIGKILL);
280	root	1.2
281			/* then loop */
282			while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
283			{
284			req->thread = thr;
285	root	1.14	errno = 0; /* strictly unnecessary */
286	root	1.2
287	root	1.18	switch (req->type)
288	root	1.2	{
289	root	1.21	#ifdef __NR_pread64
290	root	1.20	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
291			case REQ_WRITE: req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
292	root	1.21	#else
293			case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
294			case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
295			#endif
296			#ifdef __NR_stat64
297			struct stat64 statdata;
298			case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
299			case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
300			case REQ_FSTAT: req->result = fstat64 (req->fd, &statdata); COPY_STATDATA; break;
301			#else
302			struct stat statdata;
303			case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break;
304			case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break;
305			case REQ_FSTAT: req->result = fstat (req->fd, &statdata); COPY_STATDATA; break;
306			#endif
307	root	1.20	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
308			case REQ_CLOSE: req->result = close (req->fd); break;
309			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
310	root	1.18
311			case REQ_QUIT:
312			default:
313			write (respipe[1], (void *)&req, sizeof (req));
314			return 0;
315	root	1.2	}
316
317	root	1.8	req->errorno = errno;
318	root	1.2	write (respipe[1], (void *)&req, sizeof (req));
319			}
320
321			return 0;
322	root	1.1	}
323
324			MODULE = Linux::AIO PACKAGE = Linux::AIO
325
326			BOOT:
327			{
328	root	1.8	sigfillset (&fullsigset);
329	root	1.9	sigdelset (&fullsigset, SIGTERM);
330			sigdelset (&fullsigset, SIGQUIT);
331			sigdelset (&fullsigset, SIGABRT);
332			sigdelset (&fullsigset, SIGINT);
333	root	1.8
334	root	1.1	if (pipe (reqpipe) \|\| pipe (respipe))
335			croak ("unable to initialize request or result pipe");
336	root	1.18
337			if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))
338			croak ("cannot set result pipe to nonblocking mode");
339	root	1.5
340			if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
341			croak ("cannot set result pipe to nonblocking mode");
342	root	1.1	}
343
344			void
345			min_parallel(nthreads)
346			int nthreads
347	root	1.5	PROTOTYPE: $
348	root	1.1	CODE:
349			while (nthreads > started)
350			start_thread ();
351
352			void
353			max_parallel(nthreads)
354			int nthreads
355	root	1.5	PROTOTYPE: $
356	root	1.1	CODE:
357	root	1.5	int cur = started;
358			while (cur > nthreads)
359			{
360			end_thread ();
361			cur--;
362			}
363
364	root	1.1	while (started > nthreads)
365	root	1.5	{
366	root	1.14	fd_set rfd;
367			FD_ZERO(&rfd);
368			FD_SET(respipe[0], &rfd);
369
370			select (respipe[0] + 1, &rfd, 0, 0, 0);
371	root	1.17	poll_cb (aTHX);
372	root	1.5	}
373	root	1.1
374			void
375	root	1.8	aio_open(pathname,flags,mode,callback)
376	root	1.13	SV * pathname
377	root	1.8	int flags
378			int mode
379			SV * callback
380			PROTOTYPE: $$$$
381			CODE:
382			aio_req req;
383
384	root	1.14	Newz (0, req, 1, aio_cb);
385	root	1.8
386			if (!req)
387			croak ("out of memory during aio_req allocation");
388
389			req->type = REQ_OPEN;
390	root	1.14	req->data = newSVsv (pathname);
391			req->dataptr = SvPV_nolen (req->data);
392	root	1.8	req->fd = flags;
393			req->mode = mode;
394	root	1.10	req->callback = SvREFCNT_inc (callback);
395
396			send_req (req);
397
398			void
399			aio_close(fh,callback)
400	root	1.13	InputStream fh
401	root	1.10	SV * callback
402	root	1.14	PROTOTYPE: $$
403	root	1.10	CODE:
404			aio_req req;
405
406	root	1.14	Newz (0, req, 1, aio_cb);
407	root	1.10
408			if (!req)
409			croak ("out of memory during aio_req allocation");
410
411			req->type = REQ_CLOSE;
412			req->fd = PerlIO_fileno (fh);
413	root	1.13	req->callback = SvREFCNT_inc (callback);
414
415			send_req (req);
416
417			void
418			aio_read(fh,offset,length,data,dataoffset,callback)
419			InputStream fh
420			UV offset
421			IV length
422			SV * data
423			IV dataoffset
424			SV * callback
425			PROTOTYPE: $$$$$$
426			CODE:
427			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
428
429			void
430			aio_write(fh,offset,length,data,dataoffset,callback)
431			OutputStream fh
432			UV offset
433			IV length
434			SV * data
435			IV dataoffset
436			SV * callback
437			PROTOTYPE: $$$$$$
438			CODE:
439			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
440
441			void
442			aio_stat(fh_or_path,callback)
443			SV * fh_or_path
444			SV * callback
445			PROTOTYPE: $$
446			ALIAS:
447			aio_lstat = 1
448			CODE:
449			aio_req req;
450
451	root	1.14	Newz (0, req, 1, aio_cb);
452	root	1.13
453			if (!req)
454			croak ("out of memory during aio_req allocation");
455
456	root	1.21	New (0, req->statdata, 1, Stat_t);
457	root	1.13
458			if (!req->statdata)
459			croak ("out of memory during aio_req->statdata allocation");
460
461			if (SvPOK (fh_or_path))
462			{
463			req->type = ix ? REQ_LSTAT : REQ_STAT;
464	root	1.14	req->data = newSVsv (fh_or_path);
465			req->dataptr = SvPV_nolen (req->data);
466	root	1.13	}
467			else
468			{
469			req->type = REQ_FSTAT;
470			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
471			}
472
473	root	1.8	req->callback = SvREFCNT_inc (callback);
474
475			send_req (req);
476	root	1.20
477			void
478			aio_unlink(pathname,callback)
479			SV * pathname
480			SV * callback
481			PROTOTYPE: $$
482			CODE:
483			aio_req req;
484
485			Newz (0, req, 1, aio_cb);
486
487			if (!req)
488			croak ("out of memory during aio_req allocation");
489
490			req->type = REQ_UNLINK;
491			req->data = newSVsv (pathname);
492			req->dataptr = SvPV_nolen (req->data);
493			req->callback = SvREFCNT_inc (callback);
494
495			send_req (req);
496	root	1.5
497			int
498			poll_fileno()
499			PROTOTYPE:
500			CODE:
501			RETVAL = respipe[0];
502			OUTPUT:
503			RETVAL
504
505			int
506	root	1.6	poll_cb(...)
507	root	1.5	PROTOTYPE:
508			CODE:
509			RETVAL = poll_cb (aTHX);
510			OUTPUT:
511			RETVAL
512
513			int
514			nreqs()
515			PROTOTYPE:
516			CODE:
517			RETVAL = nreqs;
518			OUTPUT:
519			RETVAL
520