Linux-AIO/AIO.xs

#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};

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

typedef struct {
  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;

  struct stat64 *statdata;
} aio_cb;

typedef aio_cb *aio_req;

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

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|CLONE_SIGHAND,
             thr) >= 0)
    started++;
  else
    Safefree (thr);
}

static void
end_thread(void)
{
  aio_req req;
  New (0, req, 1, aio_cb);
  req->type = REQ_QUIT;
  write (reqpipe[1], &req, sizeof (aio_req));
}

static void
send_req (aio_req req)
{
  nreqs++;
  write (reqpipe[1], &req, sizeof (aio_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.st_dev     = req->statdata->st_dev;
              PL_statcache.st_ino     = req->statdata->st_ino;
              PL_statcache.st_mode    = req->statdata->st_mode;
              PL_statcache.st_nlink   = req->statdata->st_nlink;
              PL_statcache.st_uid     = req->statdata->st_uid;
              PL_statcache.st_gid     = req->statdata->st_gid;
              PL_statcache.st_rdev    = req->statdata->st_rdev;
              PL_statcache.st_size    = req->statdata->st_size;
              PL_statcache.st_atime   = req->statdata->st_atime;
              PL_statcache.st_mtime   = req->statdata->st_mtime;
              PL_statcache.st_ctime   = req->statdata->st_ctime;
              PL_statcache.st_blksize = req->statdata->st_blksize;
              PL_statcache.st_blocks  = req->statdata->st_blocks;

              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);
    }

  return count;
}

static sigset_t fullsigset;

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

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

  /* 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)

  _syscall4(int,pread,int,fd,char *,buf,size_t,count,off_t,offset)
  _syscall4(int,pwrite,int,fd,char *,buf,size_t,count,off_t,offset)

  _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)

  sigprocmask (SIG_SETMASK, &fullsigset, 0);

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

      if (req->type == REQ_READ)
        req->result = pread (req->fd, req->dataptr, req->length, req->offset);
      else if (req->type == REQ_WRITE)
        req->result = pwrite (req->fd, req->dataptr, req->length, req->offset);
      else if (req->type == REQ_OPEN)
        req->result = open (req->dataptr, req->fd, req->mode);
      else if (req->type == REQ_CLOSE)
        req->result = close (req->fd);
      else if (req->type == REQ_STAT)
        req->result = stat64 (req->dataptr, req->statdata);
      else if (req->type == REQ_LSTAT)
        req->result = lstat64 (req->dataptr, req->statdata);
      else if (req->type == REQ_FSTAT)
        req->result = fstat64 (req->fd, req->statdata);
      else
        {
          write (respipe[1], (void *)&req, sizeof (req));
          break;
        }

      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 (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 ();
          }

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, struct stat64);

        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);

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:	1.14
Committed:	Tue Apr 2 14:01:09 2002 UTC (22 years, 1 month ago) by root
Branch:	MAIN
Changes since 1.13:	+20 -21 lines
Log Message:	* empty log message *
#	Content
1	#include "EXTERN.h"
2	#include "perl.h"
3	#include "XSUB.h"
4
5	#include <sys/types.h>
6	#include <sys/stat.h>
7	#include <unistd.h>
8	#include <fcntl.h>
9	#include <signal.h>
10	#include <sched.h>
11
12	typedef void InputStream; / hack, but 5.6.1 is simply toooo old ;) */
13	typedef void OutputStream; / hack, but 5.6.1 is simply toooo old ;) */
14	typedef void InOutStream; / hack, but 5.6.1 is simply toooo old ;) */
15
16	#define STACKSIZE 1024 /* yeah */
17
18	enum { REQ_QUIT, REQ_OPEN, REQ_CLOSE, REQ_READ, REQ_WRITE, REQ_STAT, REQ_LSTAT, REQ_FSTAT};
19
20	typedef struct {
21	char stack[STACKSIZE];
22	} aio_thread;
23
24	typedef struct {
25	int type;
26	aio_thread *thread;
27
28	int fd;
29	off_t offset;
30	size_t length;
31	ssize_t result;
32	mode_t mode; /* open */
33	int errorno;
34	SV data, callback;
35	void *dataptr;
36	STRLEN dataoffset;
37
38	struct stat64 *statdata;
39	} aio_cb;
40
41	typedef aio_cb *aio_req;
42
43	static int started;
44	static int nreqs;
45	static int reqpipe[2], respipe[2];
46
47	static int aio_proc(void *arg);
48
49	static void
50	start_thread(void)
51	{
52	aio_thread *thr;
53
54	New (0, thr, 1, aio_thread);
55
56	if (clone (aio_proc,
57	&(thr->stack[STACKSIZE]),
58	CLONE_VM\|CLONE_FS\|CLONE_FILES\|CLONE_SIGHAND,
59	thr) >= 0)
60	started++;
61	else
62	Safefree (thr);
63	}
64
65	static void
66	end_thread(void)
67	{
68	aio_req req;
69	New (0, req, 1, aio_cb);
70	req->type = REQ_QUIT;
71	write (reqpipe[1], &req, sizeof (aio_req));
72	}
73
74	static void
75	send_req (aio_req req)
76	{
77	nreqs++;
78	write (reqpipe[1], &req, sizeof (aio_req));
79	}
80
81	static void
82	read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
83	SV data, STRLEN dataoffset, SVcallback)
84	{
85	aio_req req;
86	STRLEN svlen;
87	char *svptr = SvPV (data, svlen);
88
89	SvUPGRADE (data, SVt_PV);
90	SvPOK_on (data);
91
92	if (dataoffset < 0)
93	dataoffset += svlen;
94
95	if (dataoffset < 0 \|\| dataoffset > svlen)
96	croak ("data offset outside of string");
97
98	if (dowrite)
99	{
100	/* write: check length and adjust. */
101	if (length < 0 \|\| length + dataoffset > svlen)
102	length = svlen - dataoffset;
103	}
104	else
105	{
106	/* read: grow scalar as necessary */
107	svptr = SvGROW (data, length + dataoffset);
108	}
109
110	if (length < 0)
111	croak ("length must not be negative");
112
113	Newz (0, req, 1, aio_cb);
114
115	if (!req)
116	croak ("out of memory during aio_req allocation");
117
118	req->type = dowrite ? REQ_WRITE : REQ_READ;
119	req->fd = fd;
120	req->offset = offset;
121	req->length = length;
122	req->data = SvREFCNT_inc (data);
123	req->dataptr = (char *)svptr + dataoffset;
124	req->callback = SvREFCNT_inc (callback);
125
126	send_req (req);
127	}
128
129	static int
130	poll_cb (pTHX)
131	{
132	dSP;
133	int count = 0;
134	aio_req req;
135
136	while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
137	{
138	if (req->type == REQ_QUIT)
139	{
140	Safefree (req->thread);
141	started--;
142	}
143	else
144	{
145	int errorno = errno;
146	errno = req->errorno;
147
148	if (req->type == REQ_READ)
149	SvCUR_set (req->data, req->dataoffset
150	+ req->result > 0 ? req->result : 0);
151
152	if (req->data)
153	SvREFCNT_dec (req->data);
154
155	if (req->type == REQ_STAT \|\| req->type == REQ_LSTAT \|\| req->type == REQ_FSTAT)
156	{
157	PL_laststype = req->type == REQ_LSTAT ? OP_LSTAT : OP_STAT;
158	PL_laststatval = req->result;
159	PL_statcache.st_dev = req->statdata->st_dev;
160	PL_statcache.st_ino = req->statdata->st_ino;
161	PL_statcache.st_mode = req->statdata->st_mode;
162	PL_statcache.st_nlink = req->statdata->st_nlink;
163	PL_statcache.st_uid = req->statdata->st_uid;
164	PL_statcache.st_gid = req->statdata->st_gid;
165	PL_statcache.st_rdev = req->statdata->st_rdev;
166	PL_statcache.st_size = req->statdata->st_size;
167	PL_statcache.st_atime = req->statdata->st_atime;
168	PL_statcache.st_mtime = req->statdata->st_mtime;
169	PL_statcache.st_ctime = req->statdata->st_ctime;
170	PL_statcache.st_blksize = req->statdata->st_blksize;
171	PL_statcache.st_blocks = req->statdata->st_blocks;
172
173	Safefree (req->statdata);
174	}
175
176	PUSHMARK (SP);
177	XPUSHs (sv_2mortal (newSViv (req->result)));
178	PUTBACK;
179	call_sv (req->callback, G_VOID);
180	SPAGAIN;
181
182	if (req->callback)
183	SvREFCNT_dec (req->callback);
184
185	errno = errorno;
186	nreqs--;
187	count++;
188	}
189
190	Safefree (req);
191	}
192
193	return count;
194	}
195
196	static sigset_t fullsigset;
197
198	#undef errno
199	#include <asm/unistd.h>
200
201	static int
202	aio_proc(void *thr_arg)
203	{
204	aio_thread *thr = thr_arg;
205	aio_req req;
206	int errno;
207
208	/* we rely on gcc's ability to create closures. */
209	_syscall3(int,read,int,fd,char *,buf,size_t,count)
210	_syscall3(int,write,int,fd,char *,buf,size_t,count)
211
212	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode)
213	_syscall1(int,close,int,fd)
214
215	_syscall4(int,pread,int,fd,char *,buf,size_t,count,off_t,offset)
216	_syscall4(int,pwrite,int,fd,char *,buf,size_t,count,off_t,offset)
217
218	_syscall2(int,stat64, const char , filename, struct stat64 , buf)
219	_syscall2(int,lstat64, const char , filename, struct stat64 , buf)
220	_syscall2(int,fstat64, int, fd, struct stat64 *, buf)
221
222	sigprocmask (SIG_SETMASK, &fullsigset, 0);
223
224	/* then loop */
225	while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
226	{
227	req->thread = thr;
228	errno = 0; /* strictly unnecessary */
229
230	if (req->type == REQ_READ)
231	req->result = pread (req->fd, req->dataptr, req->length, req->offset);
232	else if (req->type == REQ_WRITE)
233	req->result = pwrite (req->fd, req->dataptr, req->length, req->offset);
234	else if (req->type == REQ_OPEN)
235	req->result = open (req->dataptr, req->fd, req->mode);
236	else if (req->type == REQ_CLOSE)
237	req->result = close (req->fd);
238	else if (req->type == REQ_STAT)
239	req->result = stat64 (req->dataptr, req->statdata);
240	else if (req->type == REQ_LSTAT)
241	req->result = lstat64 (req->dataptr, req->statdata);
242	else if (req->type == REQ_FSTAT)
243	req->result = fstat64 (req->fd, req->statdata);
244	else
245	{
246	write (respipe[1], (void *)&req, sizeof (req));
247	break;
248	}
249
250	req->errorno = errno;
251	write (respipe[1], (void *)&req, sizeof (req));
252	}
253
254	return 0;
255	}
256
257	MODULE = Linux::AIO PACKAGE = Linux::AIO
258
259	BOOT:
260	{
261	sigfillset (&fullsigset);
262	sigdelset (&fullsigset, SIGTERM);
263	sigdelset (&fullsigset, SIGQUIT);
264	sigdelset (&fullsigset, SIGABRT);
265	sigdelset (&fullsigset, SIGINT);
266
267	if (pipe (reqpipe) \|\| pipe (respipe))
268	croak ("unable to initialize request or result pipe");
269
270	if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
271	croak ("cannot set result pipe to nonblocking mode");
272	}
273
274	void
275	min_parallel(nthreads)
276	int nthreads
277	PROTOTYPE: $
278	CODE:
279	while (nthreads > started)
280	start_thread ();
281
282	void
283	max_parallel(nthreads)
284	int nthreads
285	PROTOTYPE: $
286	CODE:
287	int cur = started;
288	while (cur > nthreads)
289	{
290	end_thread ();
291	cur--;
292	}
293
294	while (started > nthreads)
295	{
296	fd_set rfd;
297	FD_ZERO(&rfd);
298	FD_SET(respipe[0], &rfd);
299
300	select (respipe[0] + 1, &rfd, 0, 0, 0);
301	poll_cb ();
302	}
303
304	void
305	aio_open(pathname,flags,mode,callback)
306	SV * pathname
307	int flags
308	int mode
309	SV * callback
310	PROTOTYPE: $$$$
311	CODE:
312	aio_req req;
313
314	Newz (0, req, 1, aio_cb);
315
316	if (!req)
317	croak ("out of memory during aio_req allocation");
318
319	req->type = REQ_OPEN;
320	req->data = newSVsv (pathname);
321	req->dataptr = SvPV_nolen (req->data);
322	req->fd = flags;
323	req->mode = mode;
324	req->callback = SvREFCNT_inc (callback);
325
326	send_req (req);
327
328	void
329	aio_close(fh,callback)
330	InputStream fh
331	SV * callback
332	PROTOTYPE: $$
333	CODE:
334	aio_req req;
335
336	Newz (0, req, 1, aio_cb);
337
338	if (!req)
339	croak ("out of memory during aio_req allocation");
340
341	req->type = REQ_CLOSE;
342	req->fd = PerlIO_fileno (fh);
343	req->callback = SvREFCNT_inc (callback);
344
345	send_req (req);
346
347	void
348	aio_read(fh,offset,length,data,dataoffset,callback)
349	InputStream fh
350	UV offset
351	IV length
352	SV * data
353	IV dataoffset
354	SV * callback
355	PROTOTYPE: $$$$$$
356	CODE:
357	read_write (aTHX_ 0, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
358
359	void
360	aio_write(fh,offset,length,data,dataoffset,callback)
361	OutputStream fh
362	UV offset
363	IV length
364	SV * data
365	IV dataoffset
366	SV * callback
367	PROTOTYPE: $$$$$$
368	CODE:
369	read_write (aTHX_ 1, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
370
371	void
372	aio_stat(fh_or_path,callback)
373	SV * fh_or_path
374	SV * callback
375	PROTOTYPE: $$
376	ALIAS:
377	aio_lstat = 1
378	CODE:
379	aio_req req;
380
381	Newz (0, req, 1, aio_cb);
382
383	if (!req)
384	croak ("out of memory during aio_req allocation");
385
386	New (0, req->statdata, 1, struct stat64);
387
388	if (!req->statdata)
389	croak ("out of memory during aio_req->statdata allocation");
390
391	if (SvPOK (fh_or_path))
392	{
393	req->type = ix ? REQ_LSTAT : REQ_STAT;
394	req->data = newSVsv (fh_or_path);
395	req->dataptr = SvPV_nolen (req->data);
396	}
397	else
398	{
399	req->type = REQ_FSTAT;
400	req->fd = PerlIO_fileno (IoIFP (sv_2io (fh_or_path)));
401	}
402
403	req->callback = SvREFCNT_inc (callback);
404
405	send_req (req);
406
407	int
408	poll_fileno()
409	PROTOTYPE:
410	CODE:
411	RETVAL = respipe[0];
412	OUTPUT:
413	RETVAL
414
415	int
416	poll_cb(...)
417	PROTOTYPE:
418	CODE:
419	RETVAL = poll_cb (aTHX);
420	OUTPUT:
421	RETVAL
422
423	int
424	nreqs()
425	PROTOTYPE:
426	CODE:
427	RETVAL = nreqs;
428	OUTPUT:
429	RETVAL
430