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/cvs/Linux-AIO/AIO.xs
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Comparing Linux-AIO/AIO.xs (file contents):
Revision 1.4 by root, Tue Aug 14 14:56:22 2001 UTC vs.
Revision 1.8 by root, Thu Aug 16 02:43:46 2001 UTC

… …
2#include "perl.h" 2#include "perl.h"
3#include "XSUB.h" 3#include "XSUB.h"
4 4
5#include <sys/types.h> 5#include <sys/types.h>
6#include <unistd.h> 6#include <unistd.h>
7#include <fcntl.h>
8#include <signal.h>
7#include <sched.h> 9#include <sched.h>
8 10
9#define STACKSIZE 128 /* yeah */ 11#define STACKSIZE 1024 /* yeah */
10 12
11#define REQ_QUIT 0 13enum { REQ_QUIT, REQ_READ, REQ_WRITE, REQ_OPEN };
12#define REQ_READ 1
13#define REQ_WRITE 2
14 14
15typedef struct { 15typedef struct {
16 char stack[STACKSIZE]; 16 char stack[STACKSIZE];
17} aio_thread; 17} aio_thread;
18 18
… …
23/* read/write */ 23/* read/write */
24 int fd; 24 int fd;
25 off_t offset; 25 off_t offset;
26 size_t length; 26 size_t length;
27 ssize_t result; 27 ssize_t result;
28 mode_t mode; /* open */
28 int errorno; 29 int errorno;
29 30 SV *data, *callback;
30 SV *data;
31 void *dataptr; 31 void *dataptr;
32 STRLEN dataoffset; 32 STRLEN dataoffset;
33} aio_cb; 33} aio_cb;
34 34
35typedef aio_cb *aio_req; 35typedef aio_cb *aio_req;
36 36
37static int started; 37static int started;
38static int nreqs;
38static int reqpipe[2], respipe[2]; 39static int reqpipe[2], respipe[2];
39 40
40static int aio_proc(void *arg); 41static int aio_proc(void *arg);
41 42
42static void 43static void
… …
56} 57}
57 58
58static void 59static void
59end_thread(void) 60end_thread(void)
60{ 61{
61 aio_req req = 0; 62 aio_req req;
63 New (0, req, 1, aio_cb);
64 req->type = REQ_QUIT;
62 write (reqpipe[1], &req, sizeof (aio_req)); 65 write (reqpipe[1], &req, sizeof (aio_req));
63 started--;
64} 66}
65 67
66static void 68static void
67set_errno(int errorno) 69send_req (aio_req req)
68{ 70{
71 nreqs++;
72 write (reqpipe[1], &req, sizeof (aio_req));
73}
74
75static void
76read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
77 SV *data, STRLEN dataoffset, SV*callback)
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
120static int
121poll_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
69 errno = errorno; 152 errno = errorno;
153 nreqs--;
154 count++;
155 }
156
157 Safefree (req);
158 }
159
160 return count;
70} 161}
162
163static sigset_t fullsigset;
71 164
72#undef errno 165#undef errno
73#include <asm/unistd.h> 166#include <asm/unistd.h>
74 167
75static int 168static int
… …
78 aio_thread *thr = thr_arg; 171 aio_thread *thr = thr_arg;
79 int sig; 172 int sig;
80 int errno; 173 int errno;
81 aio_req req; 174 aio_req req;
82 175
176 sigprocmask (SIG_SETMASK, &fullsigset, 0);
177
83 /* we rely on gcc's ability to create closures. */ 178 /* we rely on gcc's ability to create closures. */
84 _syscall3(int,lseek,int,fd,off_t,offset,int,whence); 179 _syscall3(int,lseek,int,fd,off_t,offset,int,whence);
85 _syscall3(int,read,int,fd,char *,buf,off_t,count); 180 _syscall3(int,read,int,fd,char *,buf,off_t,count);
86 _syscall3(int,write,int,fd,char *,buf,off_t,count); 181 _syscall3(int,write,int,fd,char *,buf,off_t,count);
182 _syscall3(int,open,char *,pathname,int,flags,mode_t,mode);
87 183
88 /* first get rid of any signals */
89 for (sig = 1; sig < _NSIG; sig++)
90 signal (sig, SIG_IGN);
91
92 signal (SIGTERM, SIG_DFL);
93
94 /* then loop */ 184 /* then loop */
95 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 185 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
96 { 186 {
97 req->thread = thr; 187 req->thread = thr;
188 errno = 0;
98 189
99 if (req->type == REQ_READ || req->type == REQ_WRITE) 190 if (req->type == REQ_READ || req->type == REQ_WRITE)
100 { 191 {
101 errno = 0;
102
103 if (lseek (req->fd, req->offset, SEEK_SET) == req->offset) 192 if (lseek (req->fd, req->offset, SEEK_SET) == req->offset)
104 { 193 {
105 if (req->type == REQ_READ) 194 if (req->type == REQ_READ)
106 req->result = read (req->fd, req->dataptr, req->length); 195 req->result = read (req->fd, req->dataptr, req->length);
107 else 196 else
108 req->result = write(req->fd, req->dataptr, req->length); 197 req->result = write(req->fd, req->dataptr, req->length);
109 } 198 }
110 199 }
111 req->errorno = errno; 200 else if (req->type == REQ_OPEN)
201 {
202 req->result = open (req->dataptr, req->fd, req->mode);
112 } 203 }
113 else 204 else
114 { 205 {
115 write (respipe[1], (void *)&req, sizeof (req)); 206 write (respipe[1], (void *)&req, sizeof (req));
116 break; 207 break;
117 } 208 }
118 209
210 req->errorno = errno;
119 write (respipe[1], (void *)&req, sizeof (req)); 211 write (respipe[1], (void *)&req, sizeof (req));
120 } 212 }
121 213
122 return 0; 214 return 0;
123} 215}
124 216
125MODULE = Linux::AIO PACKAGE = Linux::AIO 217MODULE = Linux::AIO PACKAGE = Linux::AIO
126 218
127BOOT: 219BOOT:
128{ 220{
221 sigfillset (&fullsigset);
222
129 if (pipe (reqpipe) || pipe (respipe)) 223 if (pipe (reqpipe) || pipe (respipe))
130 croak ("unable to initialize request or result pipe"); 224 croak ("unable to initialize request or result pipe");
225
226 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
227 croak ("cannot set result pipe to nonblocking mode");
131} 228}
132 229
133void 230void
134min_parallel(nthreads) 231min_parallel(nthreads)
135 int nthreads 232 int nthreads
233 PROTOTYPE: $
136 CODE: 234 CODE:
137 while (nthreads > started) 235 while (nthreads > started)
138 start_thread (); 236 start_thread ();
139 237
140void 238void
141max_parallel(nthreads) 239max_parallel(nthreads)
142 int nthreads 240 int nthreads
241 PROTOTYPE: $
143 CODE: 242 CODE:
243 int cur = started;
244 while (cur > nthreads)
245 {
246 end_thread ();
247 cur--;
248 }
249
250 poll_cb ();
144 while (started > nthreads) 251 while (started > nthreads)
145 end_thread (); 252 {
253 sched_yield ();
254 poll_cb ();
255 }
146 256
147void 257void
148read(fh,offset,length,data,dataoffset,callback) 258aio_read(fh,offset,length,data,dataoffset,callback)
259 PerlIO * fh
260 UV offset
261 STRLEN length
262 SV * data
263 STRLEN dataoffset
264 SV * callback
265 PROTOTYPE: $$$$$$
149 ALIAS: 266 ALIAS:
150 write = 1 267 aio_write = 1
151 CODE: 268 CODE:
269 SvUPGRADE (data, SVt_PV);
270 SvPOK_on (data);
271 read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
272
273void
274aio_open(pathname,flags,mode,callback)
275 char * pathname
276 int flags
277 int mode
278 SV * callback
279 PROTOTYPE: $$$$
280 CODE:
281 aio_req req;
282
283 New (0, req, 1, aio_cb);
284
285 if (!req)
286 croak ("out of memory during aio_req allocation");
287
288 req->type = REQ_OPEN;
289 req->dataptr = pathname;
290 req->fd = flags;
291 req->mode = mode;
292 req->callback = SvREFCNT_inc (callback);
293
294 send_req (req);
295
296int
297poll_fileno()
298 PROTOTYPE:
299 CODE:
300 RETVAL = respipe[0];
301 OUTPUT:
302 RETVAL
303
304int
305poll_cb(...)
306 PROTOTYPE:
307 CODE:
308 RETVAL = poll_cb (aTHX);
309 OUTPUT:
310 RETVAL
311
312int
313nreqs()
314 PROTOTYPE:
315 CODE:
316 RETVAL = nreqs;
317 OUTPUT:
318 RETVAL
319

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