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