Linux-AIO/AIO.xs

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

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

#define STACKSIZE 1024 /* yeah */

enum { REQ_QUIT, REQ_READ, REQ_WRITE, REQ_OPEN };

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

typedef struct {
  int type;
  aio_thread *thread;

/* read/write */
  int fd;
  off_t offset;
  size_t length;
  ssize_t result;
  mode_t mode; /* open */
  int errorno;
  SV *data, *callback;
  void *dataptr;
  STRLEN dataoffset;
} 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);

  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");

  New (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);

          PUSHMARK (SP);
          XPUSHs (sv_2mortal (newSViv (req->result)));
          PUTBACK;
          call_sv (req->callback, G_VOID);
          SPAGAIN;
          
          SvREFCNT_dec (req->data);
          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;

  sigprocmask (SIG_SETMASK, &fullsigset, 0);

  /* we rely on gcc's ability to create closures. */
  _syscall3(int,lseek,int,fd,off_t,offset,int,whence);
  _syscall3(int,read,int,fd,char *,buf,off_t,count);
  _syscall3(int,write,int,fd,char *,buf,off_t,count);
  _syscall3(int,open,char *,pathname,int,flags,mode_t,mode);

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

      if (req->type == REQ_READ || req->type == REQ_WRITE)
        {
          if (lseek (req->fd, req->offset, SEEK_SET) == req->offset)
            {
              if (req->type == REQ_READ)
                req->result = read (req->fd, req->dataptr, req->length);
              else
                req->result = write(req->fd, req->dataptr, req->length);
            }
        }
      else if (req->type == REQ_OPEN)
        {
          req->result = open (req->dataptr, req->fd, req->mode);
        }
      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--;
          }

        poll_cb ();
        while (started > nthreads)
          {
            sched_yield ();
            poll_cb ();
          }

void
aio_read(fh,offset,length,data,dataoffset,callback)
        PerlIO *        fh
        UV              offset
        STRLEN          length
        SV *            data
        STRLEN          dataoffset
        SV *            callback
        PROTOTYPE: $$$$$$
        ALIAS:
          aio_write = 1
        CODE:
        SvUPGRADE (data, SVt_PV);
        SvPOK_on (data);
        read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);

void
aio_open(pathname,flags,mode,callback)
        char *  pathname
        int     flags
        int     mode
        SV *    callback
        PROTOTYPE: $$$$
        CODE:
        aio_req req;

        New (0, req, 1, aio_cb);

        if (!req)
          croak ("out of memory during aio_req allocation");

        req->type = REQ_OPEN;
        req->dataptr = pathname;
        req->fd = flags;
        req->mode = mode;
        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:	1.9
Committed:	Thu Aug 16 18:58:34 2001 UTC (22 years, 9 months ago) by root
Branch:	MAIN
Changes since 1.8:	+5 -2 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 <unistd.h>
7	#include <fcntl.h>
8	#include <signal.h>
9	#include <sched.h>
10
11	#define STACKSIZE 1024 /* yeah */
12
13	enum { REQ_QUIT, REQ_READ, REQ_WRITE, REQ_OPEN };
14
15	typedef struct {
16	char stack[STACKSIZE];
17	} aio_thread;
18
19	typedef struct {
20	int type;
21	aio_thread *thread;
22
23	/* read/write */
24	int fd;
25	off_t offset;
26	size_t length;
27	ssize_t result;
28	mode_t mode; /* open */
29	int errorno;
30	SV data, callback;
31	void *dataptr;
32	STRLEN dataoffset;
33	} aio_cb;
34
35	typedef aio_cb *aio_req;
36
37	static int started;
38	static int nreqs;
39	static int reqpipe[2], respipe[2];
40
41	static int aio_proc(void *arg);
42
43	static void
44	start_thread(void)
45	{
46	aio_thread *thr;
47
48	New (0, thr, 1, aio_thread);
49
50	if (clone (aio_proc,
51	&(thr->stack[STACKSIZE]),
52	CLONE_VM\|CLONE_FS\|CLONE_FILES\|CLONE_SIGHAND,
53	thr) >= 0)
54	started++;
55	else
56	Safefree (thr);
57	}
58
59	static void
60	end_thread(void)
61	{
62	aio_req req;
63	New (0, req, 1, aio_cb);
64	req->type = REQ_QUIT;
65	write (reqpipe[1], &req, sizeof (aio_req));
66	}
67
68	static void
69	send_req (aio_req req)
70	{
71	nreqs++;
72	write (reqpipe[1], &req, sizeof (aio_req));
73	}
74
75	static void
76	read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
77	SV data, STRLEN dataoffset, SVcallback)
78	{
79	aio_req req;
80	STRLEN svlen;
81	char *svptr = SvPV (data, svlen);
82
83	if (dataoffset < 0)
84	dataoffset += svlen;
85
86	if (dataoffset < 0 \|\| dataoffset > svlen)
87	croak ("data offset outside of string");
88
89	if (dowrite)
90	{
91	/* write: check length and adjust. */
92	if (length < 0 \|\| length + dataoffset > svlen)
93	length = svlen - dataoffset;
94	}
95	else
96	{
97	/* read: grow scalar as necessary */
98	svptr = SvGROW (data, length + dataoffset);
99	}
100
101	if (length < 0)
102	croak ("length must not be negative");
103
104	New (0, req, 1, aio_cb);
105
106	if (!req)
107	croak ("out of memory during aio_req allocation");
108
109	req->type = dowrite ? REQ_WRITE : REQ_READ;
110	req->fd = fd;
111	req->offset = offset;
112	req->length = length;
113	req->data = SvREFCNT_inc (data);
114	req->dataptr = (char *)svptr + dataoffset;
115	req->callback = SvREFCNT_inc (callback);
116
117	send_req (req);
118	}
119
120	static int
121	poll_cb (pTHX)
122	{
123	dSP;
124	int count = 0;
125	aio_req req;
126
127	while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
128	{
129	if (req->type == REQ_QUIT)
130	{
131	Safefree (req->thread);
132	started--;
133	}
134	else
135	{
136	int errorno = errno;
137	errno = req->errorno;
138
139	if (req->type == REQ_READ)
140	SvCUR_set (req->data, req->dataoffset
141	+ req->result > 0 ? req->result : 0);
142
143	PUSHMARK (SP);
144	XPUSHs (sv_2mortal (newSViv (req->result)));
145	PUTBACK;
146	call_sv (req->callback, G_VOID);
147	SPAGAIN;
148
149	SvREFCNT_dec (req->data);
150	SvREFCNT_dec (req->callback);
151
152	errno = errorno;
153	nreqs--;
154	count++;
155	}
156
157	Safefree (req);
158	}
159
160	return count;
161	}
162
163	static sigset_t fullsigset;
164
165	#undef errno
166	#include <asm/unistd.h>
167
168	static int
169	aio_proc(void *thr_arg)
170	{
171	aio_thread *thr = thr_arg;
172	aio_req req;
173	int errno;
174
175	sigprocmask (SIG_SETMASK, &fullsigset, 0);
176
177	/* we rely on gcc's ability to create closures. */
178	_syscall3(int,lseek,int,fd,off_t,offset,int,whence);
179	_syscall3(int,read,int,fd,char *,buf,off_t,count);
180	_syscall3(int,write,int,fd,char *,buf,off_t,count);
181	_syscall3(int,open,char *,pathname,int,flags,mode_t,mode);
182
183	/* then loop */
184	while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
185	{
186	req->thread = thr;
187	errno = 0;
188
189	if (req->type == REQ_READ \|\| req->type == REQ_WRITE)
190	{
191	if (lseek (req->fd, req->offset, SEEK_SET) == req->offset)
192	{
193	if (req->type == REQ_READ)
194	req->result = read (req->fd, req->dataptr, req->length);
195	else
196	req->result = write(req->fd, req->dataptr, req->length);
197	}
198	}
199	else if (req->type == REQ_OPEN)
200	{
201	req->result = open (req->dataptr, req->fd, req->mode);
202	}
203	else
204	{
205	write (respipe[1], (void *)&req, sizeof (req));
206	break;
207	}
208
209	req->errorno = errno;
210	write (respipe[1], (void *)&req, sizeof (req));
211	}
212
213	return 0;
214	}
215
216	MODULE = Linux::AIO PACKAGE = Linux::AIO
217
218	BOOT:
219	{
220	sigfillset (&fullsigset);
221	sigdelset (&fullsigset, SIGTERM);
222	sigdelset (&fullsigset, SIGQUIT);
223	sigdelset (&fullsigset, SIGABRT);
224	sigdelset (&fullsigset, SIGINT);
225
226	if (pipe (reqpipe) \|\| pipe (respipe))
227	croak ("unable to initialize request or result pipe");
228
229	if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
230	croak ("cannot set result pipe to nonblocking mode");
231	}
232
233	void
234	min_parallel(nthreads)
235	int nthreads
236	PROTOTYPE: $
237	CODE:
238	while (nthreads > started)
239	start_thread ();
240
241	void
242	max_parallel(nthreads)
243	int nthreads
244	PROTOTYPE: $
245	CODE:
246	int cur = started;
247	while (cur > nthreads)
248	{
249	end_thread ();
250	cur--;
251	}
252
253	poll_cb ();
254	while (started > nthreads)
255	{
256	sched_yield ();
257	poll_cb ();
258	}
259
260	void
261	aio_read(fh,offset,length,data,dataoffset,callback)
262	PerlIO * fh
263	UV offset
264	STRLEN length
265	SV * data
266	STRLEN dataoffset
267	SV * callback
268	PROTOTYPE: $$$$$$
269	ALIAS:
270	aio_write = 1
271	CODE:
272	SvUPGRADE (data, SVt_PV);
273	SvPOK_on (data);
274	read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
275
276	void
277	aio_open(pathname,flags,mode,callback)
278	char * pathname
279	int flags
280	int mode
281	SV * callback
282	PROTOTYPE: $$$$
283	CODE:
284	aio_req req;
285
286	New (0, req, 1, aio_cb);
287
288	if (!req)
289	croak ("out of memory during aio_req allocation");
290
291	req->type = REQ_OPEN;
292	req->dataptr = pathname;
293	req->fd = flags;
294	req->mode = mode;
295	req->callback = SvREFCNT_inc (callback);
296
297	send_req (req);
298
299	int
300	poll_fileno()
301	PROTOTYPE:
302	CODE:
303	RETVAL = respipe[0];
304	OUTPUT:
305	RETVAL
306
307	int
308	poll_cb(...)
309	PROTOTYPE:
310	CODE:
311	RETVAL = poll_cb (aTHX);
312	OUTPUT:
313	RETVAL
314
315	int
316	nreqs()
317	PROTOTYPE:
318	CODE:
319	RETVAL = nreqs;
320	OUTPUT:
321	RETVAL
322