Commit | Line | Data |
---|---|---|
fc8c4d9e KT |
1 | # |
2 | /* | |
3 | * Copyright 1973 Bell Telephone Laboratories Inc | |
4 | */ | |
5 | ||
6 | #include "../param.h" | |
7 | #include "../user.h" | |
8 | #include "../proc.h" | |
9 | #include "../text.h" | |
10 | #include "../systm.h" | |
11 | #include "../file.h" | |
12 | #include "../inode.h" | |
13 | #include "../buf.h" | |
14 | ||
15 | #define PS 0177776 | |
16 | struct { | |
17 | int integ; | |
18 | }; | |
19 | ||
20 | sleep(chan, pri) | |
21 | { | |
22 | register *rp, s; | |
23 | ||
24 | u.u_dsleep = 0; | |
25 | s = PS->integ; | |
26 | rp = u.u_procp; | |
27 | if(pri >= 0) { | |
28 | if(issig()) | |
29 | goto psig; | |
30 | rp->p_wchan = chan; | |
31 | rp->p_stat = SWAIT; | |
32 | rp->p_pri = pri; | |
33 | spl0(); | |
34 | if(runin != 0) { | |
35 | runin = 0; | |
36 | wakeup(&runin); | |
37 | } | |
38 | swtch(); | |
39 | if(issig()) { | |
40 | psig: | |
41 | aretu(u.u_qsav); | |
42 | return; | |
43 | } | |
44 | } else { | |
45 | rp->p_wchan = chan; | |
46 | rp->p_stat = SSLEEP; | |
47 | rp->p_pri = pri; | |
48 | spl0(); | |
49 | swtch(); | |
50 | } | |
51 | PS->integ = s; | |
52 | } | |
53 | ||
54 | wakeup(chan) | |
55 | { | |
56 | register struct proc *p; | |
57 | register n, c; | |
58 | ||
59 | loop: | |
60 | c = chan; | |
61 | n = 0; | |
62 | for(p = &proc[0]; p < &proc[NPROC]; p++) | |
63 | if(p->p_wchan == c) { | |
64 | if(runout!=0 && (p->p_flag&SLOAD)==0) { | |
65 | runout = 0; | |
66 | n++; | |
67 | } | |
68 | p->p_wchan = 0; | |
69 | p->p_stat = SRUN; | |
70 | runrun++; | |
71 | } | |
72 | if(n) { | |
73 | chan = &runout; | |
74 | goto loop; | |
75 | } | |
76 | } | |
77 | ||
78 | sched() | |
79 | { | |
80 | struct proc *p1; | |
81 | register struct proc *rp; | |
82 | register a, n; | |
83 | ||
84 | /* | |
85 | * find user to swap in | |
86 | * of users ready, select one out longest | |
87 | */ | |
88 | ||
89 | goto loop; | |
90 | ||
91 | sloop: | |
92 | runin++; | |
93 | sleep(&runin, PSWP); | |
94 | ||
95 | loop: | |
96 | spl6(); | |
97 | n = -1; | |
98 | for(rp = &proc[0]; rp < &proc[NPROC]; rp++) | |
99 | if(rp->p_stat==SRUN && (rp->p_flag&SLOAD)==0 && | |
100 | rp->p_time > n) { | |
101 | p1 = rp; | |
102 | n = rp->p_time; | |
103 | } | |
104 | if(n == -1) { | |
105 | runout++; | |
106 | sleep(&runout, PSWP); | |
107 | goto loop; | |
108 | } | |
109 | ||
110 | /* | |
111 | * see if there is core for that process | |
112 | */ | |
113 | ||
114 | spl0(); | |
115 | rp = p1; | |
116 | a = rp->p_size; | |
117 | if((rp=rp->p_textp) != NULL) | |
118 | if(rp->x_ccount == 0) | |
119 | a =+ rp->x_size; | |
120 | if((a=malloc(coremap, a)) != NULL) | |
121 | goto found2; | |
122 | ||
123 | /* | |
124 | * none found, | |
125 | * look around for easy core | |
126 | */ | |
127 | ||
128 | spl6(); | |
129 | for(rp = &proc[0]; rp < &proc[NPROC]; rp++) | |
130 | if((rp->p_flag&(SSYS|SLOCK|SLOAD))==SLOAD && | |
131 | rp->p_stat == SWAIT) | |
132 | goto found1; | |
133 | ||
134 | /* | |
135 | * no easy core, | |
136 | * if this process is deserving, | |
137 | * look around for | |
138 | * oldest process in core | |
139 | */ | |
140 | ||
141 | if(n < 3) | |
142 | goto sloop; | |
143 | n = -1; | |
144 | for(rp = &proc[0]; rp < &proc[NPROC]; rp++) | |
145 | if((rp->p_flag&(SSYS|SLOCK|SLOAD))==SLOAD && | |
146 | (rp->p_stat==SRUN || rp->p_stat==SSLEEP) && | |
147 | rp->p_time > n) { | |
148 | p1 = rp; | |
149 | n = rp->p_time; | |
150 | } | |
151 | if(n < 2) | |
152 | goto sloop; | |
153 | rp = p1; | |
154 | ||
155 | /* | |
156 | * swap user out | |
157 | */ | |
158 | ||
159 | found1: | |
160 | spl0(); | |
161 | rp->p_flag =& ~SLOAD; | |
162 | xswap(rp, 1, 0); | |
163 | goto loop; | |
164 | ||
165 | /* | |
166 | * swap user in | |
167 | */ | |
168 | ||
169 | found2: | |
170 | if((rp=p1->p_textp) != NULL) { | |
171 | if(rp->x_ccount == 0) { | |
172 | if(swap(rp->x_daddr, a, rp->x_size, B_READ)) | |
173 | goto swaper; | |
174 | rp->x_caddr = a; | |
175 | a =+ rp->x_size; | |
176 | } | |
177 | rp->x_ccount++; | |
178 | } | |
179 | rp = p1; | |
180 | if(swap(rp->p_addr, a, rp->p_size, B_READ)) | |
181 | goto swaper; | |
182 | mfree(swapmap, (rp->p_size+7)/8, rp->p_addr); | |
183 | rp->p_addr = a; | |
184 | rp->p_flag =| SLOAD; | |
185 | rp->p_time = 0; | |
186 | goto loop; | |
187 | ||
188 | swaper: | |
189 | panic("swap error"); | |
190 | } | |
191 | ||
192 | swtch() | |
193 | { | |
194 | static int *p; | |
195 | register i, n; | |
196 | register struct proc *rp; | |
197 | ||
198 | if(p == NULL) | |
199 | p = &proc[0]; | |
200 | savu(u.u_rsav); | |
201 | retu(proc[0].p_addr); | |
202 | ||
203 | loop: | |
204 | rp = p; | |
205 | p = NULL; | |
206 | n = 127; | |
207 | for(i=0; i<NPROC; i++) { | |
208 | rp++; | |
209 | if(rp >= &proc[NPROC]) | |
210 | rp = &proc[0]; | |
211 | if(rp->p_stat==SRUN && (rp->p_flag&SLOAD)!=0) { | |
212 | if(rp->p_pri < n) { | |
213 | p = rp; | |
214 | n = rp->p_pri; | |
215 | } | |
216 | } | |
217 | } | |
218 | if(p == NULL) { | |
219 | p = rp; | |
220 | idle(); | |
221 | goto loop; | |
222 | } | |
223 | rp = p; | |
224 | retu(rp->p_addr); | |
225 | sureg(); | |
226 | if(rp->p_flag&SSWAP) { | |
227 | rp->p_flag =& ~SSWAP; | |
228 | aretu(u.u_ssav); | |
229 | } | |
230 | return(1); | |
231 | } | |
232 | ||
233 | newproc() | |
234 | { | |
235 | int a1, a2; | |
236 | struct proc *p, *up; | |
237 | register struct proc *rpp; | |
238 | register *rip, n; | |
239 | ||
240 | for(rpp = &proc[0]; rpp < &proc[NPROC]; rpp++) | |
241 | if(rpp->p_stat == NULL) | |
242 | goto found; | |
243 | panic("no procs"); | |
244 | ||
245 | found: | |
246 | /* | |
247 | * make proc entry for new proc | |
248 | */ | |
249 | ||
250 | p = rpp; | |
251 | rip = u.u_procp; | |
252 | up = rip; | |
253 | rpp->p_stat = SRUN; | |
254 | rpp->p_flag = SLOAD; | |
255 | rpp->p_uid = rip->p_uid; | |
256 | rpp->p_ttyp = rip->p_ttyp; | |
257 | rpp->p_textp = rip->p_textp; | |
258 | rpp->p_pid = ++mpid; | |
259 | rpp->p_ppid = rip->p_pid; | |
260 | rpp->p_time = 0; | |
261 | ||
262 | /* | |
263 | * make duplicate entries | |
264 | * where needed | |
265 | */ | |
266 | ||
267 | for(rip = &u.u_ofile[0]; rip < &u.u_ofile[NOFILE];) | |
268 | if((rpp = *rip++) != NULL) | |
269 | rpp->f_count++; | |
270 | if((rpp=up->p_textp) != NULL) { | |
271 | rpp->x_count++; | |
272 | rpp->x_ccount++; | |
273 | } | |
274 | u.u_cdir->i_count++; | |
275 | ||
276 | /* | |
277 | * swap out old process | |
278 | * to make image of new proc | |
279 | */ | |
280 | ||
281 | savu(u.u_rsav); | |
282 | rpp = p; | |
283 | u.u_procp = rpp; | |
284 | rip = up; | |
285 | n = rip->p_size; | |
286 | a1 = rip->p_addr; | |
287 | rpp->p_size = n; | |
288 | a2 = malloc(coremap, n); | |
289 | if(a2 == NULL) { | |
290 | rip->p_stat = SIDL; | |
291 | rpp->p_addr = a1; | |
292 | savu(u.u_ssav); | |
293 | xswap(rpp, 0, 0); | |
294 | rpp->p_flag =| SSWAP; | |
295 | rip->p_stat = SRUN; | |
296 | } else { | |
297 | rpp->p_addr = a2; | |
298 | while(n--) | |
299 | copyseg(a1++, a2++); | |
300 | } | |
301 | u.u_procp = rip; | |
302 | return(0); | |
303 | } | |
304 | ||
305 | expand(newsize) | |
306 | { | |
307 | int i, n; | |
308 | register *p, a1, a2; | |
309 | ||
310 | p = u.u_procp; | |
311 | n = p->p_size; | |
312 | p->p_size = newsize; | |
313 | a1 = p->p_addr; | |
314 | if(n >= newsize) { | |
315 | mfree(coremap, n-newsize, a1+newsize); | |
316 | return; | |
317 | } | |
318 | savu(u.u_rsav); | |
319 | a2 = malloc(coremap, newsize); | |
320 | if(a2 == NULL) { | |
321 | savu(u.u_ssav); | |
322 | xswap(p, 1, n); | |
323 | p->p_flag =| SSWAP; | |
324 | swtch(); | |
325 | /* no return */ | |
326 | } | |
327 | p->p_addr = a2; | |
328 | for(i=0; i<n; i++) | |
329 | copyseg(a1+i, a2++); | |
330 | mfree(coremap, n, a1); | |
331 | retu(p->p_addr); | |
332 | sureg(); | |
333 | } |