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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 1.5 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_QUIT 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
… …
25 off_t offset; 26 off_t offset;
26 size_t length; 27 size_t length;
27 ssize_t result; 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 dataoffset; 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];
39 41
40static int aio_proc(void *arg); 42static int aio_proc(void *arg);
41 43
42static void 44static void
… …
56} 58}
57 59
58static void 60static void
59end_thread(void) 61end_thread(void)
60{ 62{
61 aio_req req = 0; 63 aio_req req;
64 New (0, req, 1, aio_cb);
65 req->type = REQ_QUIT;
62 write (reqpipe[1], &req, sizeof (aio_req)); 66 write (reqpipe[1], &req, sizeof (aio_req));
63 started--;
64} 67}
65 68
66static void 69static void
67set_errno(int errorno) 70read_write (pTHX_ int dowrite, int fd, off_t offset, size_t length,
71 SV *data, STRLEN dataoffset, SV*callback)
68{ 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
69 errno = errorno; 148 errno = errorno;
149 nreqs--;
150 count++;
151 }
152
153 Safefree (req);
154 }
155
156 return count;
70} 157}
71 158
72#undef errno 159#undef errno
73#include <asm/unistd.h> 160#include <asm/unistd.h>
74 161
… …
85 _syscall3(int,read,int,fd,char *,buf,off_t,count); 172 _syscall3(int,read,int,fd,char *,buf,off_t,count);
86 _syscall3(int,write,int,fd,char *,buf,off_t,count); 173 _syscall3(int,write,int,fd,char *,buf,off_t,count);
87 174
88 /* first get rid of any signals */ 175 /* first get rid of any signals */
89 for (sig = 1; sig < _NSIG; sig++) 176 for (sig = 1; sig < _NSIG; sig++)
90 signal (sig, SIG_IGN); 177 signal (sig, SIG_DFL);
91 178
92 signal (SIGTERM, SIG_DFL); 179 signal (SIGPIPE, SIG_IGN);
93 180
94 /* then loop */ 181 /* then loop */
95 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req)) 182 while (read (reqpipe[0], (void *)&req, sizeof (req)) == sizeof (req))
96 { 183 {
97 req->thread = thr; 184 req->thread = thr;
… …
126 213
127BOOT: 214BOOT:
128{ 215{
129 if (pipe (reqpipe) || pipe (respipe)) 216 if (pipe (reqpipe) || pipe (respipe))
130 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");
131} 221}
132 222
133void 223void
134min_parallel(nthreads) 224min_parallel(nthreads)
135 int nthreads 225 int nthreads
226 PROTOTYPE: $
136 CODE: 227 CODE:
137 while (nthreads > started) 228 while (nthreads > started)
138 start_thread (); 229 start_thread ();
139 230
140void 231void
141max_parallel(nthreads) 232max_parallel(nthreads)
142 int nthreads 233 int nthreads
234 PROTOTYPE: $
143 CODE: 235 CODE:
236 int cur = started;
237 while (cur > nthreads)
238 {
239 end_thread ();
240 cur--;
241 }
242
243 poll_cb ();
144 while (started > nthreads) 244 while (started > nthreads)
145 end_thread (); 245 {
246 sched_yield ();
247 poll_cb ();
248 }
146 249
147void 250void
148read(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: $$$$$$
149 ALIAS: 259 ALIAS:
150 write = 1 260 aio_write = 1
151 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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