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Comparing Linux-AIO/AIO.xs (file contents):
Revision 1.1 by root, Tue Aug 14 03:18:53 2001 UTC vs.
Revision 1.5 by root, Tue Aug 14 18:06:37 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>
7#include <sched.h> 8#include <sched.h>
8 9
9#define STACKSIZE 128 /* yeah */ 10#define STACKSIZE 1024 /* yeah */
10 11
11#define REQ_EXIT 0 12#define REQ_QUIT 0
12#define REQ_READ 1 13#define REQ_READ 1
13#define REQ_WRITE 2 14#define REQ_WRITE 2
14 15
15typedef struct { 16typedef struct {
16 char stack[STACKSIZE]; 17 char stack[STACKSIZE];
… …
22 23
23/* read/write */ 24/* read/write */
24 int fd; 25 int fd;
25 off_t offset; 26 off_t offset;
26 size_t length; 27 size_t length;
27 ssize_t done; 28 ssize_t result;
28 int errorno; 29 int errorno;
29 30
30 SV *data; 31 SV *data, *callback;
31 void *dataptr; 32 void *dataptr;
32 STRLEN offset; 33 STRLEN dataoffset;
33} aio_cb; 34} aio_cb;
34 35
35typedef aio_cb *aio_req; 36typedef aio_cb *aio_req;
36 37
37static int started; 38static int started;
39static int nreqs;
38static int reqpipe[2], respipe[2]; 40static int reqpipe[2], respipe[2];
41
42static int aio_proc(void *arg);
39 43
40static void 44static void
41start_thread(void) 45start_thread(void)
42{ 46{
43 aio_thread *thr = NEW ( 47 aio_thread *thr;
48
49 New (0, thr, 1, aio_thread);
50
44 __clone (aio_proc, 51 if (clone (aio_proc,
52 &(thr->stack[STACKSIZE]),
53 CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND,
54 thr) >= 0)
55 started++;
56 else
57 Safefree (thr);
45} 58}
46 59
47static void 60static void
48end_thread(void) 61end_thread(void)
49{ 62{
50 aio_req req = 0; 63 aio_req req;
64 New (0, req, 1, aio_cb);
65 req->type = REQ_QUIT;
51 write (reqpipe[1], &req, sizeof (aio_req)); 66 write (reqpipe[1], &req, sizeof (aio_req));
52 nthreads--; 67}
68
69static void
70read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
71 SV *data, STRLEN dataoffset, SV*callback)
72{
73 aio_req req;
74 STRLEN svlen;
75 char *svptr = SvPV (data, svlen);
76
77 if (dataoffset < 0)
78 dataoffset += svlen;
79
80 if (dataoffset < 0 || dataoffset > svlen)
81 croak ("data offset outside of string");
82
83 if (dowrite)
84 {
85 /* write: check length and adjust. */
86 if (length < 0 || length + dataoffset > svlen)
87 length = svlen - dataoffset;
88 }
89 else
90 {
91 /* read: grow scalar as necessary */
92 svptr = SvGROW (data, length + dataoffset);
93 }
94
95 if (length < 0)
96 croak ("length must not be negative");
97
98 New (0, req, 1, aio_cb);
99
100 if (!req)
101 croak ("out of memory during aio_req allocation");
102
103 req->type = dowrite ? REQ_WRITE : REQ_READ;
104 req->fd = fd;
105 req->offset = offset;
106 req->length = length;
107 req->data = SvREFCNT_inc (data);
108 req->dataptr = svptr + dataoffset;
109 req->callback = SvREFCNT_inc (callback);
110
111 nreqs++;
112 write (reqpipe[1], &req, sizeof (aio_req));
113}
114
115static int
116poll_cb (pTHX)
117{
118 dSP;
119 int count = 0;
120 aio_req req;
121
122 while (read (respipe[0], (void *)&req, sizeof (req)) == sizeof (req))
123 {
124 if (req->type == REQ_QUIT)
125 {
126 Safefree (req->thread);
127 started--;
128 }
129 else
130 {
131 int errorno = errno;
132 errno = req->errorno;
133
134 if (req->type == REQ_READ)
135 SvCUR_set (req->data, req->result > 0
136 ? req->dataoffset + req->result
137 : req->dataoffset);
138
139 PUSHMARK (SP);
140 XPUSHs (sv_2mortal (newSViv (req->result)));
141 PUTBACK;
142 call_sv (req->callback, G_VOID);
143 SPAGAIN;
144
145 SvREFCNT_dec (req->data);
146 SvREFCNT_dec (req->callback);
147
148 errno = errorno;
149 nreqs--;
150 count++;
151 }
152
153 Safefree (req);
154 }
155
156 return count;
157}
158
159#undef errno
160#include <asm/unistd.h>
161
162static int
163aio_proc(void *thr_arg)
164{
165 aio_thread *thr = thr_arg;
166 int sig;
167 int errno;
168 aio_req req;
169
170 /* we rely on gcc's ability to create closures. */
171 _syscall3(int,lseek,int,fd,off_t,offset,int,whence);
172 _syscall3(int,read,int,fd,char *,buf,off_t,count);
173 _syscall3(int,write,int,fd,char *,buf,off_t,count);
174
175 /* first get rid of any signals */
176 for (sig = 1; sig < _NSIG; sig++)
177 signal (sig, SIG_DFL);
178
179 signal (SIGPIPE, SIG_IGN);
180
181 /* then loop */
182 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
183 {
184 req->thread = thr;
185
186 if (req->type == REQ_READ || req->type == REQ_WRITE)
187 {
188 errno = 0;
189
190 if (lseek (req->fd, req->offset, SEEK_SET) == req->offset)
191 {
192 if (req->type == REQ_READ)
193 req->result = read (req->fd, req->dataptr, req->length);
194 else
195 req->result = write(req->fd, req->dataptr, req->length);
196 }
197
198 req->errorno = errno;
199 }
200 else
201 {
202 write (respipe[1], (void *)&req, sizeof (req));
203 break;
204 }
205
206 write (respipe[1], (void *)&req, sizeof (req));
207 }
208
209 return 0;
53} 210}
54 211
55MODULE = Linux::AIO PACKAGE = Linux::AIO 212MODULE = Linux::AIO PACKAGE = Linux::AIO
56 213
57BOOT: 214BOOT:
58{ 215{
59 if (pipe (reqpipe) || pipe (respipe)) 216 if (pipe (reqpipe) || pipe (respipe))
60 croak ("unable to initialize request or result pipe"); 217 croak ("unable to initialize request or result pipe");
218
219 if (fcntl (respipe[0], F_SETFL, O_NONBLOCK))
220 croak ("cannot set result pipe to nonblocking mode");
61} 221}
62 222
63void 223void
64min_parallel(nthreads) 224min_parallel(nthreads)
65 int nthreads 225 int nthreads
226 PROTOTYPE: $
66 CODE: 227 CODE:
67 while (nthreads > started) 228 while (nthreads > started)
68 start_thread (); 229 start_thread ();
69 230
70void 231void
71max_parallel(nthreads) 232max_parallel(nthreads)
72 int nthreads 233 int nthreads
234 PROTOTYPE: $
73 CODE: 235 CODE:
236 int cur = started;
237 while (cur > nthreads)
238 {
239 end_thread ();
240 cur--;
241 }
242
243 poll_cb ();
74 while (started > nthreads) 244 while (started > nthreads)
75 end_thread (); 245 {
246 sched_yield ();
247 poll_cb ();
248 }
76 249
77void 250void
78read(fh,offset,length,data,dataoffset,callback) 251aio_read(fh,offset,length,data,dataoffset,callback)
252 PerlIO * fh
253 unsigned long offset
254 long length
255 SV * data
256 STRLEN dataoffset
257 SV * callback
258 PROTOTYPE: $$$$$$
259 ALIAS:
260 aio_write = 1
79 CODE: 261 CODE:
262 sv_upgrade (data, SVt_PV);
263 read_write (aTHX_ ix, PerlIO_fileno (fh), offset, length, data, dataoffset, callback);
264
265int
266poll_fileno()
267 PROTOTYPE:
268 CODE:
269 RETVAL = respipe[0];
270 OUTPUT:
271 RETVAL
272
273int
274poll_cb()
275 PROTOTYPE:
276 CODE:
277 RETVAL = poll_cb (aTHX);
278 OUTPUT:
279 RETVAL
280
281int
282nreqs()
283 PROTOTYPE:
284 CODE:
285 RETVAL = nreqs;
286 OUTPUT:
287 RETVAL
288

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