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 (128 * sizeof (long)) /* 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 - 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>

#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)
          {
            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:	1.23
Committed:	Wed Jun 29 15:28:14 2005 UTC (18 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.22:	+6 -0 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	1.22	#define STACKSIZE (128 * sizeof (long)) /* 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	root	1.22	&(thr->stack[STACKSIZE - sizeof (long)]),
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	root	1.22	{
94			qe->next = req;
95			qe = req;
96			}
97	root	1.18	else
98			qe = qs = req;
99
100			send_reqs ();
101			}
102
103			static void
104			end_thread (void)
105			{
106			aio_req req;
107			New (0, req, 1, aio_cb);
108			req->type = REQ_QUIT;
109
110			send_req (req);
111	root	1.8	}
112
113			static void
114	root	1.17	read_write (pTHX_
115			int dowrite, int fd, off_t offset, size_t length,
116	root	1.18	SV data, STRLEN dataoffset, SV callback)
117	root	1.2	{
118	root	1.5	aio_req req;
119			STRLEN svlen;
120			char *svptr = SvPV (data, svlen);
121
122	root	1.13	SvUPGRADE (data, SVt_PV);
123			SvPOK_on (data);
124
125	root	1.5	if (dataoffset < 0)
126			dataoffset += svlen;
127
128			if (dataoffset < 0 \|\| dataoffset > svlen)
129			croak ("data offset outside of string");
130
131			if (dowrite)
132			{
133			/* write: check length and adjust. */
134			if (length < 0 \|\| length + dataoffset > svlen)
135			length = svlen - dataoffset;
136			}
137			else
138			{
139			/* read: grow scalar as necessary */
140			svptr = SvGROW (data, length + dataoffset);
141			}
142
143			if (length < 0)
144			croak ("length must not be negative");
145
146	root	1.14	Newz (0, req, 1, aio_cb);
147	root	1.5
148			if (!req)
149			croak ("out of memory during aio_req allocation");
150
151			req->type = dowrite ? REQ_WRITE : REQ_READ;
152			req->fd = fd;
153			req->offset = offset;
154			req->length = length;
155			req->data = SvREFCNT_inc (data);
156	root	1.6	req->dataptr = (char *)svptr + dataoffset;
157	root	1.5	req->callback = SvREFCNT_inc (callback);
158
159	root	1.8	send_req (req);
160	root	1.5	}
161
162	root	1.22	static void
163			poll_wait ()
164			{
165			fd_set rfd;
166			FD_ZERO(&rfd);
167			FD_SET(respipe[0], &rfd);
168
169			select (respipe[0] + 1, &rfd, 0, 0, 0);
170			}
171
172	root	1.5	static int
173			poll_cb (pTHX)
174			{
175			dSP;
176			int count = 0;
177			aio_req req;
178
179			while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
180			{
181	root	1.22	nreqs--;
182
183	root	1.5	if (req->type == REQ_QUIT)
184			{
185			Safefree (req->thread);
186			started--;
187			}
188			else
189			{
190			int errorno = errno;
191			errno = req->errorno;
192
193			if (req->type == REQ_READ)
194	root	1.6	SvCUR_set (req->data, req->dataoffset
195			+ req->result > 0 ? req->result : 0);
196	root	1.5
197	root	1.14	if (req->data)
198			SvREFCNT_dec (req->data);
199
200	root	1.13	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
201			{
202	root	1.21	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
203			PL_laststatval = req->result;
204			PL_statcache = *(req->statdata);
205	root	1.13
206			Safefree (req->statdata);
207			}
208
209	root	1.5	PUSHMARK (SP);
210			XPUSHs (sv_2mortal (newSViv (req->result)));
211			PUTBACK;
212			call_sv (req->callback, G_VOID);
213			SPAGAIN;
214
215	root	1.14	if (req->callback)
216			SvREFCNT_dec (req->callback);
217	root	1.5
218			errno = errorno;
219			count++;
220			}
221
222			Safefree (req);
223			}
224
225	root	1.18	if (qs)
226			send_reqs ();
227
228	root	1.5	return count;
229	root	1.2	}
230
231	root	1.8	static sigset_t fullsigset;
232
233	root	1.2	#undef errno
234			#include <asm/unistd.h>
235	root	1.20	#include <sys/prctl.h>
236	root	1.2
237	root	1.21	#define COPY_STATDATA \
238			req->statdata->st_dev = statdata.st_dev; \
239			req->statdata->st_ino = statdata.st_ino; \
240			req->statdata->st_mode = statdata.st_mode; \
241			req->statdata->st_nlink = statdata.st_nlink; \
242			req->statdata->st_uid = statdata.st_uid; \
243			req->statdata->st_gid = statdata.st_gid; \
244			req->statdata->st_rdev = statdata.st_rdev; \
245			req->statdata->st_size = statdata.st_size; \
246			req->statdata->st_atime = statdata.st_atime; \
247			req->statdata->st_mtime = statdata.st_mtime; \
248			req->statdata->st_ctime = statdata.st_ctime; \
249			req->statdata->st_blksize = statdata.st_blksize; \
250			req->statdata->st_blocks = statdata.st_blocks; \
251
252	root	1.2	static int
253	root	1.18	aio_proc (void *thr_arg)
254	root	1.2	{
255			aio_thread *thr = thr_arg;
256	root	1.9	aio_req req;
257	root	1.2	int errno;
258
259	root	1.21	/* this is very much kernel-specific :(:(:( */
260	root	1.11	/* we rely on gcc's ability to create closures. */
261	root	1.13	_syscall3(int,read,int,fd,char *,buf,size_t,count)
262			_syscall3(int,write,int,fd,char *,buf,size_t,count)
263
264	root	1.11	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
265			_syscall1(int,close,int,fd)
266
267	root	1.21	#ifdef __NR_pread64
268	root	1.16	_syscall5(int,pread64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
269			_syscall5(int,pwrite64,int,fd,char *,buf,size_t,count,unsigned int,offset_lo,unsigned int,offset_hi)
270	root	1.21	#elif __NR_pread
271			_syscall4(int,pread,int,fd,char *,buf,size_t,count,offset_t,offset)
272			_syscall4(int,pwrite,int,fd,char *,buf,size_t,count,offset_t,offset)
273			#else
274			# error "neither pread nor pread64 defined"
275			#endif
276	root	1.13
277	root	1.21
278			#ifdef __NR_stat64
279	root	1.13	_syscall2(int,stat64, const char , filename, struct stat64 , buf)
280			_syscall2(int,lstat64, const char , filename, struct stat64 , buf)
281			_syscall2(int,fstat64, int, fd, struct stat64 *, buf)
282	root	1.21	#elif __NR_stat
283			_syscall2(int,stat, const char , filename, struct stat , buf)
284			_syscall2(int,lstat, const char , filename, struct stat , buf)
285			_syscall2(int,fstat, int, fd, struct stat *, buf)
286			#else
287			# error "neither stat64 nor stat defined"
288			#endif
289	root	1.13
290	root	1.20	_syscall1(int,unlink, char *, filename);
291
292	root	1.8	sigprocmask (SIG_SETMASK, &fullsigset, 0);
293	root	1.20	prctl (PR_SET_PDEATHSIG, SIGKILL);
294	root	1.2
295			/* then loop */
296			while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
297			{
298			req->thread = thr;
299	root	1.14	errno = 0; /* strictly unnecessary */
300	root	1.2
301	root	1.18	switch (req->type)
302	root	1.2	{
303	root	1.21	#ifdef __NR_pread64
304	root	1.20	case REQ_READ: req->result = pread64 (req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
305			case REQ_WRITE: req->result = pwrite64(req->fd, req->dataptr, req->length, req->offset & 0xffffffff, req->offset >> 32); break;
306	root	1.21	#else
307			case REQ_READ: req->result = pread (req->fd, req->dataptr, req->length, req->offset); break;
308			case REQ_WRITE: req->result = pwrite (req->fd, req->dataptr, req->length, req->offset); break;
309			#endif
310			#ifdef __NR_stat64
311			struct stat64 statdata;
312			case REQ_STAT: req->result = stat64 (req->dataptr, &statdata); COPY_STATDATA; break;
313			case REQ_LSTAT: req->result = lstat64 (req->dataptr, &statdata); COPY_STATDATA; break;
314			case REQ_FSTAT: req->result = fstat64 (req->fd, &statdata); COPY_STATDATA; break;
315			#else
316			struct stat statdata;
317			case REQ_STAT: req->result = stat (req->dataptr, &statdata); COPY_STATDATA; break;
318			case REQ_LSTAT: req->result = lstat (req->dataptr, &statdata); COPY_STATDATA; break;
319			case REQ_FSTAT: req->result = fstat (req->fd, &statdata); COPY_STATDATA; break;
320			#endif
321	root	1.20	case REQ_OPEN: req->result = open (req->dataptr, req->fd, req->mode); break;
322			case REQ_CLOSE: req->result = close (req->fd); break;
323			case REQ_UNLINK: req->result = unlink (req->dataptr); break;
324	root	1.18
325			case REQ_QUIT:
326			default:
327			write (respipe[1], (void *)&req, sizeof (req));
328			return 0;
329	root	1.2	}
330
331	root	1.8	req->errorno = errno;
332	root	1.2	write (respipe[1], (void *)&req, sizeof (req));
333			}
334
335			return 0;
336	root	1.1	}
337
338			MODULE = Linux::AIO PACKAGE = Linux::AIO
339
340			BOOT:
341			{
342	root	1.8	sigfillset (&fullsigset);
343	root	1.9	sigdelset (&fullsigset, SIGTERM);
344			sigdelset (&fullsigset, SIGQUIT);
345			sigdelset (&fullsigset, SIGABRT);
346			sigdelset (&fullsigset, SIGINT);
347	root	1.8
348	root	1.1	if (pipe (reqpipe) \|\| pipe (respipe))
349			croak ("unable to initialize request or result pipe");
350	root	1.18
351			if (fcntl (reqpipe[1], F_SETFL, O_NONBLOCK))
352			croak ("cannot set result pipe to nonblocking mode");
353	root	1.5
354			if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
355			croak ("cannot set result pipe to nonblocking mode");
356	root	1.1	}
357
358			void
359			min_parallel(nthreads)
360			int nthreads
361	root	1.5	PROTOTYPE: $
362	root	1.1	CODE:
363			while (nthreads > started)
364			start_thread ();
365
366			void
367			max_parallel(nthreads)
368			int nthreads
369	root	1.5	PROTOTYPE: $
370	root	1.1	CODE:
371	root	1.5	int cur = started;
372			while (cur > nthreads)
373			{
374			end_thread ();
375			cur--;
376			}
377
378	root	1.1	while (started > nthreads)
379	root	1.5	{
380	root	1.22	poll_wait ();
381	root	1.17	poll_cb (aTHX);
382	root	1.5	}
383	root	1.1
384			void
385	root	1.8	aio_open(pathname,flags,mode,callback)
386	root	1.13	SV * pathname
387	root	1.8	int flags
388			int mode
389			SV * callback
390			PROTOTYPE: $$$$
391			CODE:
392			aio_req req;
393
394	root	1.14	Newz (0, req, 1, aio_cb);
395	root	1.8
396			if (!req)
397			croak ("out of memory during aio_req allocation");
398
399			req->type = REQ_OPEN;
400	root	1.14	req->data = newSVsv (pathname);
401			req->dataptr = SvPV_nolen (req->data);
402	root	1.8	req->fd = flags;
403			req->mode = mode;
404	root	1.10	req->callback = SvREFCNT_inc (callback);
405
406			send_req (req);
407
408			void
409			aio_close(fh,callback)
410	root	1.13	InputStream fh
411	root	1.10	SV * callback
412	root	1.14	PROTOTYPE: $$
413	root	1.10	CODE:
414			aio_req req;
415
416	root	1.14	Newz (0, req, 1, aio_cb);
417	root	1.10
418			if (!req)
419			croak ("out of memory during aio_req allocation");
420
421			req->type = REQ_CLOSE;
422			req->fd = PerlIO_fileno (fh);
423	root	1.13	req->callback = SvREFCNT_inc (callback);
424
425			send_req (req);
426
427			void
428			aio_read(fh,offset,length,data,dataoffset,callback)
429			InputStream fh
430			UV offset
431			IV length
432			SV * data
433			IV dataoffset
434			SV * callback
435			PROTOTYPE: $$$$$$
436			CODE:
437			read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
438
439			void
440			aio_write(fh,offset,length,data,dataoffset,callback)
441			OutputStream fh
442			UV offset
443			IV length
444			SV * data
445			IV dataoffset
446			SV * callback
447			PROTOTYPE: $$$$$$
448			CODE:
449			read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
450
451			void
452			aio_stat(fh_or_path,callback)
453			SV * fh_or_path
454			SV * callback
455			PROTOTYPE: $$
456			ALIAS:
457			aio_lstat = 1
458			CODE:
459			aio_req req;
460
461	root	1.14	Newz (0, req, 1, aio_cb);
462	root	1.13
463			if (!req)
464			croak ("out of memory during aio_req allocation");
465
466	root	1.21	New (0, req->statdata, 1, Stat_t);
467	root	1.13
468			if (!req->statdata)
469			croak ("out of memory during aio_req->statdata allocation");
470
471			if (SvPOK (fh_or_path))
472			{
473			req->type = ix ? REQ_LSTAT : REQ_STAT;
474	root	1.14	req->data = newSVsv (fh_or_path);
475			req->dataptr = SvPV_nolen (req->data);
476	root	1.13	}
477			else
478			{
479			req->type = REQ_FSTAT;
480			req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
481			}
482
483	root	1.8	req->callback = SvREFCNT_inc (callback);
484
485			send_req (req);
486	root	1.20
487			void
488			aio_unlink(pathname,callback)
489			SV * pathname
490			SV * callback
491			PROTOTYPE: $$
492			CODE:
493			aio_req req;
494
495			Newz (0, req, 1, aio_cb);
496
497			if (!req)
498			croak ("out of memory during aio_req allocation");
499
500			req->type = REQ_UNLINK;
501			req->data = newSVsv (pathname);
502			req->dataptr = SvPV_nolen (req->data);
503			req->callback = SvREFCNT_inc (callback);
504
505			send_req (req);
506	root	1.5
507			int
508			poll_fileno()
509			PROTOTYPE:
510			CODE:
511			RETVAL = respipe[0];
512			OUTPUT:
513			RETVAL
514
515			int
516	root	1.6	poll_cb(...)
517	root	1.5	PROTOTYPE:
518			CODE:
519			RETVAL = poll_cb (aTHX);
520			OUTPUT:
521			RETVAL
522
523	root	1.23	void
524			poll_wait()
525			PROTOTYPE:
526			CODE:
527			poll_wait ();
528
529	root	1.5	int
530			nreqs()
531			PROTOTYPE:
532			CODE:
533			RETVAL = nreqs;
534			OUTPUT:
535			RETVAL
536