1 f1e8706d 2004-12-27 devnull #include "threadimpl.h"
  2 f1e8706d 2004-12-27 devnull 
  3 a620761c 2005-01-06 devnull static int
  4 a620761c 2005-01-06 devnull timefmt(Fmt *fmt)
  5 a620761c 2005-01-06 devnull {
  6 a620761c 2005-01-06 devnull 	static char *mon[] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun", 
  7 a620761c 2005-01-06 devnull 		"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
  8 a620761c 2005-01-06 devnull 	vlong ns;
  9 a620761c 2005-01-06 devnull 	Tm tm;
 10 a620761c 2005-01-06 devnull 	ns = nsec();
 11 a620761c 2005-01-06 devnull 	tm = *localtime(time(0));
 12 a620761c 2005-01-06 devnull 	return fmtprint(fmt, "%s %2d %02d:%02d:%02d.%03d", 
 13 a620761c 2005-01-06 devnull 		mon[tm.mon], tm.mday, tm.hour, tm.min, tm.sec,
 14 a620761c 2005-01-06 devnull 		(int)(ns%1000000000)/1000000);
 15 a620761c 2005-01-06 devnull }
 16 a620761c 2005-01-06 devnull 
 17 f1e8706d 2004-12-27 devnull /*
 18 f1e8706d 2004-12-27 devnull  * spin locks
 19 f1e8706d 2004-12-27 devnull  */
 20 f1e8706d 2004-12-27 devnull extern int _tas(int*);
 21 f1e8706d 2004-12-27 devnull 
 22 f1e8706d 2004-12-27 devnull void
 23 f1e8706d 2004-12-27 devnull _threadunlock(Lock *l, ulong pc)
 24 f1e8706d 2004-12-27 devnull {
 25 f1e8706d 2004-12-27 devnull 	USED(pc);
 26 f1e8706d 2004-12-27 devnull 
 27 f1e8706d 2004-12-27 devnull 	l->held = 0;
 28 f1e8706d 2004-12-27 devnull }
 29 f1e8706d 2004-12-27 devnull 
 30 f1e8706d 2004-12-27 devnull int
 31 f1e8706d 2004-12-27 devnull _threadlock(Lock *l, int block, ulong pc)
 32 f1e8706d 2004-12-27 devnull {
 33 f1e8706d 2004-12-27 devnull 	int i;
 34 a620761c 2005-01-06 devnull static int first=1;
 35 a0a331aa 2005-01-06 devnull if(first) {first=0; fmtinstall('\001', timefmt);}
 36 f1e8706d 2004-12-27 devnull 
 37 f1e8706d 2004-12-27 devnull 	USED(pc);
 38 f1e8706d 2004-12-27 devnull 
 39 f1e8706d 2004-12-27 devnull 	/* once fast */
 40 f1e8706d 2004-12-27 devnull 	if(!_tas(&l->held))
 41 f1e8706d 2004-12-27 devnull 		return 1;
 42 f1e8706d 2004-12-27 devnull 	if(!block)
 43 f1e8706d 2004-12-27 devnull 		return 0;
 44 f1e8706d 2004-12-27 devnull 
 45 f1e8706d 2004-12-27 devnull 	/* a thousand times pretty fast */
 46 815552b9 2005-01-06 devnull 	for(i=0; i<1000; i++){
 47 f1e8706d 2004-12-27 devnull 		if(!_tas(&l->held))
 48 f1e8706d 2004-12-27 devnull 			return 1;
 49 f1e8706d 2004-12-27 devnull 		sched_yield();
 50 f1e8706d 2004-12-27 devnull 	}
 51 a0a331aa 2005-01-06 devnull 	/* now increasingly slow */
 52 a620761c 2005-01-06 devnull 	for(i=0; i<10; i++){
 53 a620761c 2005-01-06 devnull 		if(!_tas(&l->held))
 54 a620761c 2005-01-06 devnull 			return 1;
 55 a620761c 2005-01-06 devnull 		usleep(1);
 56 a620761c 2005-01-06 devnull 	}
 57 a0a331aa 2005-01-06 devnull fprint(2, "%\001 %s: lock loop1 %p from %lux\n", argv0, l, pc);
 58 a620761c 2005-01-06 devnull 	for(i=0; i<10; i++){
 59 a620761c 2005-01-06 devnull 		if(!_tas(&l->held))
 60 a620761c 2005-01-06 devnull 			return 1;
 61 a620761c 2005-01-06 devnull 		usleep(10);
 62 a620761c 2005-01-06 devnull 	}
 63 a0a331aa 2005-01-06 devnull fprint(2, "%\001 %s: lock loop2 %p from %lux\n", argv0, l, pc);
 64 a620761c 2005-01-06 devnull 	for(i=0; i<10; i++){
 65 a620761c 2005-01-06 devnull 		if(!_tas(&l->held))
 66 a620761c 2005-01-06 devnull 			return 1;
 67 a620761c 2005-01-06 devnull 		usleep(100);
 68 a620761c 2005-01-06 devnull 	}
 69 a0a331aa 2005-01-06 devnull fprint(2, "%\001 %s: lock loop3 %p from %lux\n", argv0, l, pc);
 70 a620761c 2005-01-06 devnull 	for(i=0; i<10; i++){
 71 a620761c 2005-01-06 devnull 		if(!_tas(&l->held))
 72 a620761c 2005-01-06 devnull 			return 1;
 73 a620761c 2005-01-06 devnull 		usleep(1000);
 74 a620761c 2005-01-06 devnull 	}
 75 a0a331aa 2005-01-06 devnull fprint(2, "%\001 %s: lock loop4 %p from %lux\n", argv0, l, pc);
 76 a620761c 2005-01-06 devnull 	for(i=0; i<10; i++){
 77 a620761c 2005-01-06 devnull 		if(!_tas(&l->held))
 78 a620761c 2005-01-06 devnull 			return 1;
 79 a620761c 2005-01-06 devnull 		usleep(10*1000);
 80 a620761c 2005-01-06 devnull 	}
 81 a0a331aa 2005-01-06 devnull fprint(2, "%\001 %s: lock loop5 %p from %lux\n", argv0, l, pc);
 82 f1e8706d 2004-12-27 devnull 	for(i=0; i<1000; i++){
 83 f1e8706d 2004-12-27 devnull 		if(!_tas(&l->held))
 84 f1e8706d 2004-12-27 devnull 			return 1;
 85 f1e8706d 2004-12-27 devnull 		usleep(100*1000);
 86 f1e8706d 2004-12-27 devnull 	}
 87 a0a331aa 2005-01-06 devnull fprint(2, "%\001 %s: lock loop6 %p from %lux\n", argv0, l, pc);
 88 f1e8706d 2004-12-27 devnull 	/* take your time */
 89 f1e8706d 2004-12-27 devnull 	while(_tas(&l->held))
 90 f1e8706d 2004-12-27 devnull 		usleep(1000*1000);
 91 f1e8706d 2004-12-27 devnull 	return 1;
 92 f1e8706d 2004-12-27 devnull }
 93 f1e8706d 2004-12-27 devnull 
 94 f1e8706d 2004-12-27 devnull /*
 95 f1e8706d 2004-12-27 devnull  * sleep and wakeup
 96 f1e8706d 2004-12-27 devnull  */
 97 f1e8706d 2004-12-27 devnull static void
 98 f1e8706d 2004-12-27 devnull ign(int x)
 99 f1e8706d 2004-12-27 devnull {
100 f1e8706d 2004-12-27 devnull 	USED(x);
101 f1e8706d 2004-12-27 devnull }
102 f1e8706d 2004-12-27 devnull 
103 f1e8706d 2004-12-27 devnull static void /*__attribute__((constructor))*/
104 f1e8706d 2004-12-27 devnull ignusr1(int restart)
105 f1e8706d 2004-12-27 devnull {
106 f1e8706d 2004-12-27 devnull 	struct sigaction sa;
107 f1e8706d 2004-12-27 devnull 
108 f1e8706d 2004-12-27 devnull 	memset(&sa, 0, sizeof sa);
109 f1e8706d 2004-12-27 devnull 	sa.sa_handler = ign;
110 f1e8706d 2004-12-27 devnull 	sigemptyset(&sa.sa_mask);
111 f1e8706d 2004-12-27 devnull 	sigaddset(&sa.sa_mask, SIGUSR1);
112 f1e8706d 2004-12-27 devnull 	if(restart)
113 f1e8706d 2004-12-27 devnull 		sa.sa_flags = SA_RESTART;
114 f1e8706d 2004-12-27 devnull 	sigaction(SIGUSR1, &sa, nil);
115 f1e8706d 2004-12-27 devnull }
116 f1e8706d 2004-12-27 devnull 
117 f1e8706d 2004-12-27 devnull void
118 f1e8706d 2004-12-27 devnull _procsleep(_Procrendez *r)
119 f1e8706d 2004-12-27 devnull {
120 f1e8706d 2004-12-27 devnull 	sigset_t mask;
121 f1e8706d 2004-12-27 devnull 
122 f1e8706d 2004-12-27 devnull 	/*
123 f1e8706d 2004-12-27 devnull 	 * Go to sleep.
124 f1e8706d 2004-12-27 devnull 	 *
125 f1e8706d 2004-12-27 devnull 	 * Block USR1, set the handler to interrupt system calls,
126 f1e8706d 2004-12-27 devnull 	 * unlock the vouslock so our waker can wake us,
127 f1e8706d 2004-12-27 devnull 	 * and then suspend.
128 f1e8706d 2004-12-27 devnull 	 */
129 955a2ca7 2004-12-27 devnull again:
130 f1e8706d 2004-12-27 devnull 	r->asleep = 1;
131 f1e8706d 2004-12-27 devnull 	r->pid = getpid();
132 f1e8706d 2004-12-27 devnull 
133 f1e8706d 2004-12-27 devnull 	sigprocmask(SIG_SETMASK, nil, &mask);
134 f1e8706d 2004-12-27 devnull 	sigaddset(&mask, SIGUSR1);
135 f1e8706d 2004-12-27 devnull 	sigprocmask(SIG_SETMASK, &mask, nil);
136 f1e8706d 2004-12-27 devnull 	ignusr1(0);
137 f1e8706d 2004-12-27 devnull 	unlock(r->l);
138 f1e8706d 2004-12-27 devnull 	sigdelset(&mask, SIGUSR1);
139 f1e8706d 2004-12-27 devnull 	sigsuspend(&mask);
140 f1e8706d 2004-12-27 devnull 
141 f1e8706d 2004-12-27 devnull 	/*
142 f1e8706d 2004-12-27 devnull 	 * We're awake.  Make USR1 not interrupt system calls.
143 f1e8706d 2004-12-27 devnull 	 */
144 f1e8706d 2004-12-27 devnull 	lock(r->l);
145 955a2ca7 2004-12-27 devnull 	ignusr1(1);
146 955a2ca7 2004-12-27 devnull 	if(r->asleep && r->pid == getpid()){
147 955a2ca7 2004-12-27 devnull 		/* Didn't really wake up - signal from something else */
148 955a2ca7 2004-12-27 devnull 		goto again;
149 955a2ca7 2004-12-27 devnull 	}
150 f1e8706d 2004-12-27 devnull }
151 f1e8706d 2004-12-27 devnull 
152 f1e8706d 2004-12-27 devnull void
153 a0a331aa 2005-01-06 devnull _procwakeupandunlock(_Procrendez *r)
154 f1e8706d 2004-12-27 devnull {
155 a0a331aa 2005-01-06 devnull 	int pid;
156 a0a331aa 2005-01-06 devnull 
157 a0a331aa 2005-01-06 devnull 	pid = 0;
158 f1e8706d 2004-12-27 devnull 	if(r->asleep){
159 f1e8706d 2004-12-27 devnull 		r->asleep = 0;
160 f1e8706d 2004-12-27 devnull 		assert(r->pid >= 1);
161 a0a331aa 2005-01-06 devnull 		pid = r->pid;
162 f1e8706d 2004-12-27 devnull 	}
163 a0a331aa 2005-01-06 devnull 	assert(r->l);
164 a0a331aa 2005-01-06 devnull 	unlock(r->l);
165 a0a331aa 2005-01-06 devnull 	if(pid)
166 a0a331aa 2005-01-06 devnull 		kill(pid, SIGUSR1);
167 f1e8706d 2004-12-27 devnull }
168 f1e8706d 2004-12-27 devnull 
169 f1e8706d 2004-12-27 devnull /*
170 f1e8706d 2004-12-27 devnull  * process creation and exit
171 f1e8706d 2004-12-27 devnull  */
172 f1e8706d 2004-12-27 devnull typedef struct Stackfree Stackfree;
173 f1e8706d 2004-12-27 devnull struct Stackfree
174 f1e8706d 2004-12-27 devnull {
175 f1e8706d 2004-12-27 devnull 	Stackfree	*next;
176 f1e8706d 2004-12-27 devnull 	int	pid;
177 a620761c 2005-01-06 devnull 	int	pid1;
178 f1e8706d 2004-12-27 devnull };
179 f1e8706d 2004-12-27 devnull static Lock stacklock;
180 f1e8706d 2004-12-27 devnull static Stackfree *stackfree;
181 f1e8706d 2004-12-27 devnull 
182 f1e8706d 2004-12-27 devnull static void
183 a620761c 2005-01-06 devnull delayfreestack(uchar *stk, int pid, int pid1)
184 f1e8706d 2004-12-27 devnull {
185 f1e8706d 2004-12-27 devnull 	Stackfree *sf;
186 f1e8706d 2004-12-27 devnull 
187 f1e8706d 2004-12-27 devnull 	sf = (Stackfree*)stk;
188 a620761c 2005-01-06 devnull 	sf->pid = pid;
189 a620761c 2005-01-06 devnull 	sf->pid1 = pid1;
190 f1e8706d 2004-12-27 devnull 	lock(&stacklock);
191 f1e8706d 2004-12-27 devnull 	sf->next = stackfree;
192 f1e8706d 2004-12-27 devnull 	stackfree = sf;
193 f1e8706d 2004-12-27 devnull 	unlock(&stacklock);
194 f1e8706d 2004-12-27 devnull }
195 f1e8706d 2004-12-27 devnull 
196 f1e8706d 2004-12-27 devnull static void
197 f1e8706d 2004-12-27 devnull dofreestacks(void)
198 f1e8706d 2004-12-27 devnull {
199 f1e8706d 2004-12-27 devnull 	Stackfree *sf, *last, *next;
200 f1e8706d 2004-12-27 devnull 
201 f1e8706d 2004-12-27 devnull 	if(stackfree==nil || !canlock(&stacklock))
202 f1e8706d 2004-12-27 devnull 		return;
203 f1e8706d 2004-12-27 devnull 
204 f1e8706d 2004-12-27 devnull 	for(last=nil,sf=stackfree; sf; last=sf,sf=next){
205 f1e8706d 2004-12-27 devnull 		next = sf->next;
206 a620761c 2005-01-06 devnull 		if(sf->pid >= 1 && kill(sf->pid, 0) < 0 && errno == ESRCH)
207 a620761c 2005-01-06 devnull 		if(sf->pid1 >= 1 && kill(sf->pid1, 0) < 0 && errno == ESRCH){
208 f1e8706d 2004-12-27 devnull 			free(sf);
209 2c87dda8 2004-12-28 devnull 			if(last)
210 2c87dda8 2004-12-28 devnull 				last->next = next;
211 2c87dda8 2004-12-28 devnull 			else
212 2c87dda8 2004-12-28 devnull 				stackfree = next;
213 f1e8706d 2004-12-27 devnull 			sf = last;
214 f1e8706d 2004-12-27 devnull 		}
215 f1e8706d 2004-12-27 devnull 	}
216 2c87dda8 2004-12-28 devnull 	unlock(&stacklock);
217 2c87dda8 2004-12-28 devnull }
218 f1e8706d 2004-12-27 devnull 
219 f1e8706d 2004-12-27 devnull static int
220 f1e8706d 2004-12-27 devnull startprocfn(void *v)
221 f1e8706d 2004-12-27 devnull {
222 f1e8706d 2004-12-27 devnull 	void **a;
223 f1e8706d 2004-12-27 devnull 	uchar *stk;
224 f1e8706d 2004-12-27 devnull 	void (*fn)(void*);
225 f1e8706d 2004-12-27 devnull 	Proc *p;
226 a620761c 2005-01-06 devnull 	int pid0, pid1;
227 f1e8706d 2004-12-27 devnull 
228 f1e8706d 2004-12-27 devnull 	a = (void**)v;
229 f1e8706d 2004-12-27 devnull 	fn = a[0];
230 f1e8706d 2004-12-27 devnull 	p = a[1];
231 f1e8706d 2004-12-27 devnull 	stk = a[2];
232 a620761c 2005-01-06 devnull 	pid0 = (int)a[4];
233 a620761c 2005-01-06 devnull 	pid1 = getpid();
234 f1e8706d 2004-12-27 devnull 	free(a);
235 a620761c 2005-01-06 devnull 	p->osprocid = pid1;
236 f1e8706d 2004-12-27 devnull 
237 f1e8706d 2004-12-27 devnull 	(*fn)(p);
238 f1e8706d 2004-12-27 devnull 
239 a620761c 2005-01-06 devnull 	delayfreestack(stk, pid0, pid1);
240 f1e8706d 2004-12-27 devnull 	_exit(0);
241 f1e8706d 2004-12-27 devnull 	return 0;
242 f1e8706d 2004-12-27 devnull }
243 f1e8706d 2004-12-27 devnull 
244 f1e8706d 2004-12-27 devnull /*
245 f1e8706d 2004-12-27 devnull  * indirect through here so that parent need not wait for child zombie
246 f1e8706d 2004-12-27 devnull  * 
247 f1e8706d 2004-12-27 devnull  * slight race - if child exits and then another process starts before we 
248 f1e8706d 2004-12-27 devnull  * manage to exit, we'll be running on a freed stack.
249 f1e8706d 2004-12-27 devnull  */
250 f1e8706d 2004-12-27 devnull static int
251 f1e8706d 2004-12-27 devnull trampnowait(void *v)
252 f1e8706d 2004-12-27 devnull {
253 f1e8706d 2004-12-27 devnull 	void **a;
254 a620761c 2005-01-06 devnull 	int *kidpid;
255 f1e8706d 2004-12-27 devnull 
256 f1e8706d 2004-12-27 devnull 	a = (void*)v;
257 a620761c 2005-01-06 devnull 	kidpid = a[3];
258 a620761c 2005-01-06 devnull 	a[4] = (void*)getpid();
259 a620761c 2005-01-06 devnull 	*kidpid = clone(startprocfn, a[2]+65536-512, CLONE_VM|CLONE_FILES, a);
260 f1e8706d 2004-12-27 devnull 	_exit(0);
261 f1e8706d 2004-12-27 devnull 	return 0;
262 f1e8706d 2004-12-27 devnull }
263 f1e8706d 2004-12-27 devnull 
264 f1e8706d 2004-12-27 devnull void
265 f1e8706d 2004-12-27 devnull _procstart(Proc *p, void (*fn)(Proc*))
266 f1e8706d 2004-12-27 devnull {
267 f1e8706d 2004-12-27 devnull 	void **a;
268 f1e8706d 2004-12-27 devnull 	uchar *stk;
269 f1e8706d 2004-12-27 devnull 	int pid, kidpid, status;
270 f1e8706d 2004-12-27 devnull 
271 f1e8706d 2004-12-27 devnull 	dofreestacks();
272 a620761c 2005-01-06 devnull 	a = malloc(5*sizeof a[0]);
273 f1e8706d 2004-12-27 devnull 	if(a == nil)
274 f1e8706d 2004-12-27 devnull 		sysfatal("_procstart malloc: %r");
275 f1e8706d 2004-12-27 devnull 	stk = malloc(65536);
276 f1e8706d 2004-12-27 devnull 	if(stk == nil)
277 f1e8706d 2004-12-27 devnull 		sysfatal("_procstart malloc stack: %r");
278 f1e8706d 2004-12-27 devnull 
279 f1e8706d 2004-12-27 devnull 	a[0] = fn;
280 f1e8706d 2004-12-27 devnull 	a[1] = p;
281 f1e8706d 2004-12-27 devnull 	a[2] = stk;
282 f1e8706d 2004-12-27 devnull 	a[3] = &kidpid;
283 f1e8706d 2004-12-27 devnull 	kidpid = -1;
284 f1e8706d 2004-12-27 devnull 
285 f1e8706d 2004-12-27 devnull 	pid = clone(trampnowait, stk+65536-16, CLONE_VM|CLONE_FILES, a);
286 f1e8706d 2004-12-27 devnull 	if(pid > 0)
287 f1e8706d 2004-12-27 devnull 		if(wait4(pid, &status, __WALL, 0) < 0)
288 f1e8706d 2004-12-27 devnull 			fprint(2, "ffork wait4: %r\n");
289 f1e8706d 2004-12-27 devnull 	if(pid < 0 || kidpid < 0){
290 f1e8706d 2004-12-27 devnull 		fprint(2, "_procstart clone: %r\n");
291 f1e8706d 2004-12-27 devnull 		abort();
292 f1e8706d 2004-12-27 devnull 	}
293 f1e8706d 2004-12-27 devnull }
294 f1e8706d 2004-12-27 devnull 
295 f1e8706d 2004-12-27 devnull static char *threadexitsmsg;
296 f1e8706d 2004-12-27 devnull void
297 f1e8706d 2004-12-27 devnull sigusr2handler(int s)
298 f1e8706d 2004-12-27 devnull {
299 2c87dda8 2004-12-28 devnull /*	fprint(2, "%d usr2 %d\n", time(0), getpid()); */
300 f1e8706d 2004-12-27 devnull 	if(threadexitsmsg)
301 f1e8706d 2004-12-27 devnull 		_exits(threadexitsmsg);
302 f1e8706d 2004-12-27 devnull }
303 f1e8706d 2004-12-27 devnull 
304 f1e8706d 2004-12-27 devnull void
305 f1e8706d 2004-12-27 devnull threadexitsall(char *msg)
306 f1e8706d 2004-12-27 devnull {
307 f1e8706d 2004-12-27 devnull 	static int pid[1024];
308 f1e8706d 2004-12-27 devnull 	int i, npid, mypid;
309 f1e8706d 2004-12-27 devnull 	Proc *p;
310 f1e8706d 2004-12-27 devnull 
311 f1e8706d 2004-12-27 devnull 	if(msg == nil)
312 f1e8706d 2004-12-27 devnull 		msg = "";
313 f1e8706d 2004-12-27 devnull 	mypid = getpid();
314 f1e8706d 2004-12-27 devnull 	lock(&_threadprocslock);
315 f1e8706d 2004-12-27 devnull 	threadexitsmsg = msg;
316 f1e8706d 2004-12-27 devnull 	npid = 0;
317 f1e8706d 2004-12-27 devnull 	for(p=_threadprocs; p; p=p->next)
318 f1e8706d 2004-12-27 devnull 		if(p->osprocid != mypid && p->osprocid >= 1)
319 f1e8706d 2004-12-27 devnull 			pid[npid++] = p->osprocid;
320 f1e8706d 2004-12-27 devnull 	for(i=0; i<npid; i++)
321 f1e8706d 2004-12-27 devnull 		kill(pid[i], SIGUSR2);
322 f1e8706d 2004-12-27 devnull 	unlock(&_threadprocslock);
323 f1e8706d 2004-12-27 devnull 	exits(msg);
324 f1e8706d 2004-12-27 devnull }
325 f1e8706d 2004-12-27 devnull 
326 f1e8706d 2004-12-27 devnull /*
327 f1e8706d 2004-12-27 devnull  * per-process data, indexed by pid
328 f1e8706d 2004-12-27 devnull  *
329 f1e8706d 2004-12-27 devnull  * could use modify_ldt and a segment register
330 f1e8706d 2004-12-27 devnull  * to avoid the many calls to getpid(), but i don't
331 f1e8706d 2004-12-27 devnull  * care -- this is compatibility code.  linux 2.6 with
332 f1e8706d 2004-12-27 devnull  * nptl is a good enough pthreads to avoid this whole file.
333 f1e8706d 2004-12-27 devnull  */
334 f1e8706d 2004-12-27 devnull typedef struct Perproc Perproc;
335 f1e8706d 2004-12-27 devnull struct Perproc
336 f1e8706d 2004-12-27 devnull {
337 f1e8706d 2004-12-27 devnull 	int		pid;
338 f1e8706d 2004-12-27 devnull 	Proc	*proc;
339 f1e8706d 2004-12-27 devnull };
340 f1e8706d 2004-12-27 devnull 
341 f1e8706d 2004-12-27 devnull static Lock perlock;
342 f1e8706d 2004-12-27 devnull static Perproc perproc[1024];
343 f1e8706d 2004-12-27 devnull #define P ((Proc*)-1)
344 f1e8706d 2004-12-27 devnull 
345 f1e8706d 2004-12-27 devnull static Perproc*
346 f1e8706d 2004-12-27 devnull myperproc(void)
347 f1e8706d 2004-12-27 devnull {
348 f1e8706d 2004-12-27 devnull 	int i, pid, h;
349 f1e8706d 2004-12-27 devnull 	Perproc *p;
350 f1e8706d 2004-12-27 devnull 
351 f1e8706d 2004-12-27 devnull 	pid = getpid();
352 f1e8706d 2004-12-27 devnull 	h = pid%nelem(perproc);
353 f1e8706d 2004-12-27 devnull 	for(i=0; i<nelem(perproc); i++){
354 f1e8706d 2004-12-27 devnull 		p = &perproc[(i+h)%nelem(perproc)];
355 f1e8706d 2004-12-27 devnull 		if(p->pid == pid)
356 f1e8706d 2004-12-27 devnull 			return p;
357 f1e8706d 2004-12-27 devnull 		if(p->pid == 0){
358 f1e8706d 2004-12-27 devnull 			print("found 0 at %d (h=%d)\n", (i+h)%nelem(perproc), h);
359 f1e8706d 2004-12-27 devnull 			break;
360 f1e8706d 2004-12-27 devnull 		}
361 f1e8706d 2004-12-27 devnull 	}
362 f1e8706d 2004-12-27 devnull 	fprint(2, "myperproc %d: cannot find self\n", pid);
363 f1e8706d 2004-12-27 devnull 	abort();
364 f1e8706d 2004-12-27 devnull 	return nil;
365 f1e8706d 2004-12-27 devnull }
366 f1e8706d 2004-12-27 devnull 
367 f1e8706d 2004-12-27 devnull static Perproc*
368 f1e8706d 2004-12-27 devnull newperproc(void)
369 f1e8706d 2004-12-27 devnull {
370 f1e8706d 2004-12-27 devnull 	int i, pid, h;
371 f1e8706d 2004-12-27 devnull 	Perproc *p;
372 f1e8706d 2004-12-27 devnull 
373 f1e8706d 2004-12-27 devnull 	lock(&perlock);
374 f1e8706d 2004-12-27 devnull 	pid = getpid();
375 f1e8706d 2004-12-27 devnull 	h = pid%nelem(perproc);
376 f1e8706d 2004-12-27 devnull 	for(i=0; i<nelem(perproc); i++){
377 f1e8706d 2004-12-27 devnull 		p = &perproc[(i+h)%nelem(perproc)];
378 f1e8706d 2004-12-27 devnull 		if(p->pid == pid || p->pid == -1 || p->pid == 0){
379 f1e8706d 2004-12-27 devnull 			p->pid = pid;
380 f1e8706d 2004-12-27 devnull 			unlock(&perlock);
381 f1e8706d 2004-12-27 devnull 			return p;
382 f1e8706d 2004-12-27 devnull 		}
383 f1e8706d 2004-12-27 devnull 	}
384 f1e8706d 2004-12-27 devnull 	fprint(2, "newperproc %d: out of procs\n", pid);
385 f1e8706d 2004-12-27 devnull 	abort();
386 f1e8706d 2004-12-27 devnull 	return nil;
387 f1e8706d 2004-12-27 devnull }
388 f1e8706d 2004-12-27 devnull 
389 f1e8706d 2004-12-27 devnull Proc*
390 f1e8706d 2004-12-27 devnull _threadproc(void)
391 f1e8706d 2004-12-27 devnull {
392 f1e8706d 2004-12-27 devnull 	return myperproc()->proc;
393 f1e8706d 2004-12-27 devnull }
394 f1e8706d 2004-12-27 devnull 
395 f1e8706d 2004-12-27 devnull void
396 f1e8706d 2004-12-27 devnull _threadsetproc(Proc *p)
397 f1e8706d 2004-12-27 devnull {
398 f1e8706d 2004-12-27 devnull 	Perproc *pp;
399 f1e8706d 2004-12-27 devnull 
400 2c87dda8 2004-12-28 devnull 	if(p)
401 2c87dda8 2004-12-28 devnull 		p->osprocid = getpid();
402 f1e8706d 2004-12-27 devnull 	pp = newperproc();
403 f1e8706d 2004-12-27 devnull 	pp->proc = p;
404 f1e8706d 2004-12-27 devnull 	if(p == nil)
405 f1e8706d 2004-12-27 devnull 		pp->pid = -1;
406 f1e8706d 2004-12-27 devnull }
407 f1e8706d 2004-12-27 devnull 
408 f1e8706d 2004-12-27 devnull void
409 f1e8706d 2004-12-27 devnull _pthreadinit(void)
410 f1e8706d 2004-12-27 devnull {
411 f1e8706d 2004-12-27 devnull 	signal(SIGUSR2, sigusr2handler);
412 f1e8706d 2004-12-27 devnull }
413 f1e8706d 2004-12-27 devnull 
414 1d2533d0 2004-12-28 devnull void
415 1d2533d0 2004-12-28 devnull _threadpexit(void)
416 1d2533d0 2004-12-28 devnull {
417 1d2533d0 2004-12-28 devnull 	_exit(0);
418 1d2533d0 2004-12-28 devnull }
419 a620761c 2005-01-06 devnull