1 1544f909 2004-12-25 devnull #include "u.h"
  2 1544f909 2004-12-25 devnull #include <linux/unistd.h>
  3 1544f909 2004-12-25 devnull #include "libc.h"
  4 1544f909 2004-12-25 devnull #include "thread.h"
  5 1544f909 2004-12-25 devnull #include "threadimpl.h"
  6 1544f909 2004-12-25 devnull 
  7 1544f909 2004-12-25 devnull        _syscall0(pid_t,gettid)
  8 1544f909 2004-12-25 devnull 
  9 1544f909 2004-12-25 devnull int	_threaddebuglevel;
 10 1544f909 2004-12-25 devnull 
 11 1544f909 2004-12-25 devnull static	uint		threadnproc;
 12 1544f909 2004-12-25 devnull static	uint		threadnsysproc;
 13 1544f909 2004-12-25 devnull static	Lock		threadnproclock;
 14 1544f909 2004-12-25 devnull static	Ref		threadidref;
 15 1544f909 2004-12-25 devnull 
 16 1544f909 2004-12-25 devnull static	void		addthread(_Threadlist*, _Thread*);
 17 1544f909 2004-12-25 devnull static	void		delthread(_Threadlist*, _Thread*);
 18 1544f909 2004-12-25 devnull static	void		addthreadinproc(Proc*, _Thread*);
 19 1544f909 2004-12-25 devnull static	void		delthreadinproc(Proc*, _Thread*);
 20 1544f909 2004-12-25 devnull static	void		contextswitch(Context *from, Context *to);
 21 1544f909 2004-12-25 devnull static	void		scheduler(void*);
 22 1544f909 2004-12-25 devnull 
 23 1544f909 2004-12-25 devnull static _Thread*
 24 1544f909 2004-12-25 devnull getthreadnow(void)
 25 1544f909 2004-12-25 devnull {
 26 1544f909 2004-12-25 devnull 	return proc()->thread;
 27 1544f909 2004-12-25 devnull }
 28 1544f909 2004-12-25 devnull _Thread	*(*threadnow)(void) = getthreadnow;
 29 1544f909 2004-12-25 devnull 
 30 1544f909 2004-12-25 devnull static Proc*
 31 1544f909 2004-12-25 devnull procalloc(void)
 32 1544f909 2004-12-25 devnull {
 33 1544f909 2004-12-25 devnull 	Proc *p;
 34 1544f909 2004-12-25 devnull 
 35 1544f909 2004-12-25 devnull 	p = malloc(sizeof *p);
 36 1544f909 2004-12-25 devnull 	memset(p, 0, sizeof *p);
 37 1544f909 2004-12-25 devnull 	lock(&threadnproclock);
 38 1544f909 2004-12-25 devnull 	threadnproc++;
 39 1544f909 2004-12-25 devnull 	unlock(&threadnproclock);
 40 1544f909 2004-12-25 devnull 	return p;
 41 1544f909 2004-12-25 devnull }
 42 1544f909 2004-12-25 devnull 
 43 1544f909 2004-12-25 devnull static void
 44 1544f909 2004-12-25 devnull threadstart(void *v)
 45 1544f909 2004-12-25 devnull {
 46 1544f909 2004-12-25 devnull 	_Thread *t;
 47 1544f909 2004-12-25 devnull 
 48 1544f909 2004-12-25 devnull 	t = v;
 49 1544f909 2004-12-25 devnull 	t->startfn(t->startarg);
 50 1544f909 2004-12-25 devnull 	_threadexit();
 51 1544f909 2004-12-25 devnull }
 52 1544f909 2004-12-25 devnull 
 53 1544f909 2004-12-25 devnull static _Thread*
 54 1544f909 2004-12-25 devnull threadalloc(void (*fn)(void*), void *arg, uint stack)
 55 1544f909 2004-12-25 devnull {
 56 1544f909 2004-12-25 devnull 	_Thread *t;
 57 1544f909 2004-12-25 devnull 	sigset_t zero;
 58 1544f909 2004-12-25 devnull 
 59 1544f909 2004-12-25 devnull 	/* allocate the task and stack together */
 60 1544f909 2004-12-25 devnull 	t = malloc(sizeof *t+stack);
 61 1544f909 2004-12-25 devnull 	memset(t, 0, sizeof *t);
 62 1544f909 2004-12-25 devnull 	t->stk = (uchar*)(t+1);
 63 1544f909 2004-12-25 devnull 	t->stksize = stack;
 64 1544f909 2004-12-25 devnull 	t->id = incref(&threadidref);
 65 1544f909 2004-12-25 devnull 	t->startfn = fn;
 66 1544f909 2004-12-25 devnull 	t->startarg = arg;
 67 1544f909 2004-12-25 devnull 
 68 1544f909 2004-12-25 devnull 	/* do a reasonable initialization */
 69 1544f909 2004-12-25 devnull 	memset(&t->context.uc, 0, sizeof t->context.uc);
 70 1544f909 2004-12-25 devnull 	sigemptyset(&zero);
 71 1544f909 2004-12-25 devnull 	sigprocmask(SIG_BLOCK, &zero, &t->context.uc.uc_sigmask);
 72 1544f909 2004-12-25 devnull 
 73 1544f909 2004-12-25 devnull 	/* on Linux makecontext neglects floating point */
 74 1544f909 2004-12-25 devnull 	getcontext(&t->context.uc);
 75 1544f909 2004-12-25 devnull 
 76 1544f909 2004-12-25 devnull 	/* call makecontext to do the real work. */
 77 1544f909 2004-12-25 devnull 	/* leave a few words open on both ends */
 78 1544f909 2004-12-25 devnull 	t->context.uc.uc_stack.ss_sp = t->stk+8;
 79 1544f909 2004-12-25 devnull 	t->context.uc.uc_stack.ss_size = t->stksize-16;
 80 1544f909 2004-12-25 devnull 	makecontext(&t->context.uc, (void(*)())threadstart, 1, t);
 81 1544f909 2004-12-25 devnull 
 82 1544f909 2004-12-25 devnull 	return t;
 83 1544f909 2004-12-25 devnull }
 84 1544f909 2004-12-25 devnull 
 85 1544f909 2004-12-25 devnull _Thread*
 86 1544f909 2004-12-25 devnull _threadcreate(Proc *p, void (*fn)(void*), void *arg, uint stack)
 87 1544f909 2004-12-25 devnull {
 88 1544f909 2004-12-25 devnull 	_Thread *t;
 89 1544f909 2004-12-25 devnull 
 90 1544f909 2004-12-25 devnull 	t = threadalloc(fn, arg, stack);
 91 1544f909 2004-12-25 devnull 	t->proc = p;
 92 1544f909 2004-12-25 devnull 	addthreadinproc(p, t);
 93 1544f909 2004-12-25 devnull 	p->nthread++;
 94 1544f909 2004-12-25 devnull 	_threadready(t);
 95 1544f909 2004-12-25 devnull 	return t;
 96 1544f909 2004-12-25 devnull }
 97 1544f909 2004-12-25 devnull 
 98 1544f909 2004-12-25 devnull int
 99 1544f909 2004-12-25 devnull threadcreate(void (*fn)(void*), void *arg, uint stack)
100 1544f909 2004-12-25 devnull {
101 1544f909 2004-12-25 devnull 	_Thread *t;
102 1544f909 2004-12-25 devnull 
103 1544f909 2004-12-25 devnull 	t = _threadcreate(proc(), fn, arg, stack);
104 1544f909 2004-12-25 devnull 	return t->id;
105 1544f909 2004-12-25 devnull }
106 1544f909 2004-12-25 devnull 
107 1544f909 2004-12-25 devnull int
108 1544f909 2004-12-25 devnull proccreate(void (*fn)(void*), void *arg, uint stack)
109 1544f909 2004-12-25 devnull {
110 1544f909 2004-12-25 devnull 	_Thread *t;
111 1544f909 2004-12-25 devnull 	Proc *p;
112 1544f909 2004-12-25 devnull 
113 1544f909 2004-12-25 devnull 	p = procalloc();
114 1544f909 2004-12-25 devnull //print("pa %p\n", p);
115 1544f909 2004-12-25 devnull 	t = _threadcreate(p, fn, arg, stack);
116 1544f909 2004-12-25 devnull //print("ps %p\n", p);
117 1544f909 2004-12-25 devnull 	_procstart(p, scheduler);
118 1544f909 2004-12-25 devnull 	return t->id;
119 1544f909 2004-12-25 devnull }
120 1544f909 2004-12-25 devnull 
121 1544f909 2004-12-25 devnull void
122 1544f909 2004-12-25 devnull _threadswitch(void)
123 1544f909 2004-12-25 devnull {
124 1544f909 2004-12-25 devnull 	Proc *p;
125 1544f909 2004-12-25 devnull 
126 1544f909 2004-12-25 devnull 	p = proc();
127 1544f909 2004-12-25 devnull 	contextswitch(&p->thread->context, &p->schedcontext);
128 1544f909 2004-12-25 devnull }
129 1544f909 2004-12-25 devnull 
130 1544f909 2004-12-25 devnull void
131 1544f909 2004-12-25 devnull _threadready(_Thread *t)
132 1544f909 2004-12-25 devnull {
133 1544f909 2004-12-25 devnull 	Proc *p;
134 1544f909 2004-12-25 devnull 
135 1544f909 2004-12-25 devnull 	p = t->proc;
136 1544f909 2004-12-25 devnull 	lock(&p->lock);
137 1544f909 2004-12-25 devnull 	addthread(&p->runqueue, t);
138 1544f909 2004-12-25 devnull 	_procwakeup(&p->runrend);
139 1544f909 2004-12-25 devnull 	unlock(&p->lock);
140 1544f909 2004-12-25 devnull }
141 1544f909 2004-12-25 devnull 
142 1544f909 2004-12-25 devnull void
143 1544f909 2004-12-25 devnull threadyield(void)
144 1544f909 2004-12-25 devnull {
145 1544f909 2004-12-25 devnull 	_threadready(proc()->thread);
146 1544f909 2004-12-25 devnull 	_threadswitch();
147 1544f909 2004-12-25 devnull }
148 1544f909 2004-12-25 devnull 
149 1544f909 2004-12-25 devnull void
150 1544f909 2004-12-25 devnull _threadexit(void)
151 1544f909 2004-12-25 devnull {
152 1544f909 2004-12-25 devnull 	proc()->thread->exiting = 1;
153 1544f909 2004-12-25 devnull 	_threadswitch();
154 1544f909 2004-12-25 devnull }
155 1544f909 2004-12-25 devnull 
156 1544f909 2004-12-25 devnull void
157 1544f909 2004-12-25 devnull threadexits(char *msg)
158 1544f909 2004-12-25 devnull {
159 1544f909 2004-12-25 devnull /*
160 1544f909 2004-12-25 devnull 	Proc *p;
161 1544f909 2004-12-25 devnull 
162 1544f909 2004-12-25 devnull 	p = proc();
163 1544f909 2004-12-25 devnull 	utfecpy(p->msg, p->msg+sizeof p->msg, msg);
164 1544f909 2004-12-25 devnull */
165 1544f909 2004-12-25 devnull 	_threadexit();
166 1544f909 2004-12-25 devnull }
167 1544f909 2004-12-25 devnull 
168 1544f909 2004-12-25 devnull void
169 1544f909 2004-12-25 devnull threadexitsall(char *msg)
170 1544f909 2004-12-25 devnull {
171 1544f909 2004-12-25 devnull 	if(msg && msg[0])
172 1544f909 2004-12-25 devnull 		exit(1);
173 1544f909 2004-12-25 devnull 	exit(0);
174 1544f909 2004-12-25 devnull }
175 1544f909 2004-12-25 devnull 
176 1544f909 2004-12-25 devnull static void
177 1544f909 2004-12-25 devnull contextswitch(Context *from, Context *to)
178 1544f909 2004-12-25 devnull {
179 1544f909 2004-12-25 devnull 	if(swapcontext(&from->uc, &to->uc) < 0){
180 1544f909 2004-12-25 devnull 		fprint(2, "swapcontext failed: %r\n");
181 1544f909 2004-12-25 devnull 		assert(0);
182 1544f909 2004-12-25 devnull 	}
183 1544f909 2004-12-25 devnull }
184 1544f909 2004-12-25 devnull 
185 1544f909 2004-12-25 devnull static void
186 1544f909 2004-12-25 devnull scheduler(void *v)
187 1544f909 2004-12-25 devnull {
188 1544f909 2004-12-25 devnull 	_Thread *t;
189 1544f909 2004-12-25 devnull 	Proc *p;
190 1544f909 2004-12-25 devnull 
191 1544f909 2004-12-25 devnull 	p = v;
192 1544f909 2004-12-25 devnull 	setproc(p);
193 1544f909 2004-12-25 devnull 	print("s %p %d\n", p, gettid());
194 1544f909 2004-12-25 devnull 	p->tid = pthread_self();
195 1544f909 2004-12-25 devnull 	pthread_detach(p->tid);
196 1544f909 2004-12-25 devnull 	lock(&p->lock);
197 1544f909 2004-12-25 devnull 	for(;;){
198 1544f909 2004-12-25 devnull 		while((t = p->runqueue.head) == nil){
199 1544f909 2004-12-25 devnull 			if(p->nthread == 0)
200 1544f909 2004-12-25 devnull 				goto Out;
201 1544f909 2004-12-25 devnull 			p->runrend.l = &p->lock;
202 1544f909 2004-12-25 devnull 			_procsleep(&p->runrend);
203 1544f909 2004-12-25 devnull 		}
204 1544f909 2004-12-25 devnull 		delthread(&p->runqueue, t);
205 1544f909 2004-12-25 devnull 		unlock(&p->lock);
206 1544f909 2004-12-25 devnull 		p->thread = t;
207 1544f909 2004-12-25 devnull 		// print("run %s %d\n", t->name, t->id);
208 1544f909 2004-12-25 devnull 		contextswitch(&p->schedcontext, &t->context);
209 1544f909 2004-12-25 devnull 		p->thread = nil;
210 1544f909 2004-12-25 devnull 		lock(&p->lock);
211 1544f909 2004-12-25 devnull 		if(t->exiting){
212 1544f909 2004-12-25 devnull 			delthreadinproc(p, t);
213 1544f909 2004-12-25 devnull 			p->nthread--;
214 1544f909 2004-12-25 devnull 			free(t);
215 1544f909 2004-12-25 devnull 		}
216 1544f909 2004-12-25 devnull 	}
217 1544f909 2004-12-25 devnull 
218 1544f909 2004-12-25 devnull Out:
219 1544f909 2004-12-25 devnull 	lock(&threadnproclock);
220 1544f909 2004-12-25 devnull 	if(p->sysproc)
221 1544f909 2004-12-25 devnull 		--threadnsysproc;
222 1544f909 2004-12-25 devnull 	if(--threadnproc == threadnsysproc)
223 1544f909 2004-12-25 devnull 		exit(0);
224 1544f909 2004-12-25 devnull 	unlock(&threadnproclock);
225 1544f909 2004-12-25 devnull 	unlock(&p->lock);
226 1544f909 2004-12-25 devnull 	free(p);
227 1544f909 2004-12-25 devnull 	setproc(0);
228 1544f909 2004-12-25 devnull 	print("e %p (tid %d)\n", p, gettid());
229 1544f909 2004-12-25 devnull 	pthread_exit(nil);
230 1544f909 2004-12-25 devnull }
231 1544f909 2004-12-25 devnull 
232 1544f909 2004-12-25 devnull void
233 1544f909 2004-12-25 devnull _threadsetsysproc(void)
234 1544f909 2004-12-25 devnull {
235 1544f909 2004-12-25 devnull 	lock(&threadnproclock);
236 1544f909 2004-12-25 devnull 	if(++threadnsysproc == threadnproc)
237 1544f909 2004-12-25 devnull 		exit(0);
238 1544f909 2004-12-25 devnull 	unlock(&threadnproclock);
239 1544f909 2004-12-25 devnull 	proc()->sysproc = 1;
240 1544f909 2004-12-25 devnull }
241 1544f909 2004-12-25 devnull 
242 1544f909 2004-12-25 devnull /*
243 1544f909 2004-12-25 devnull  * debugging
244 1544f909 2004-12-25 devnull  */
245 1544f909 2004-12-25 devnull void
246 1544f909 2004-12-25 devnull threadsetname(char *fmt, ...)
247 1544f909 2004-12-25 devnull {
248 1544f909 2004-12-25 devnull 	va_list arg;
249 1544f909 2004-12-25 devnull 	_Thread *t;
250 1544f909 2004-12-25 devnull 
251 1544f909 2004-12-25 devnull 	t = proc()->thread;
252 1544f909 2004-12-25 devnull 	va_start(arg, fmt);
253 1544f909 2004-12-25 devnull 	vsnprint(t->name, sizeof t->name, fmt, arg);
254 1544f909 2004-12-25 devnull 	va_end(arg);
255 1544f909 2004-12-25 devnull }
256 1544f909 2004-12-25 devnull 
257 1544f909 2004-12-25 devnull void
258 1544f909 2004-12-25 devnull threadsetstate(char *fmt, ...)
259 1544f909 2004-12-25 devnull {
260 1544f909 2004-12-25 devnull 	va_list arg;
261 1544f909 2004-12-25 devnull 	_Thread *t;
262 1544f909 2004-12-25 devnull 
263 1544f909 2004-12-25 devnull 	t = proc()->thread;
264 1544f909 2004-12-25 devnull 	va_start(arg, fmt);
265 1544f909 2004-12-25 devnull 	vsnprint(t->state, sizeof t->name, fmt, arg);
266 1544f909 2004-12-25 devnull 	va_end(arg);
267 1544f909 2004-12-25 devnull }
268 1544f909 2004-12-25 devnull 
269 1544f909 2004-12-25 devnull /*
270 1544f909 2004-12-25 devnull  * locking
271 1544f909 2004-12-25 devnull  */
272 1544f909 2004-12-25 devnull static int
273 1544f909 2004-12-25 devnull threadqlock(QLock *l, int block, ulong pc)
274 1544f909 2004-12-25 devnull {
275 1544f909 2004-12-25 devnull 	lock(&l->l);
276 1544f909 2004-12-25 devnull 	if(l->owner == nil){
277 1544f909 2004-12-25 devnull 		l->owner = (*threadnow)();
278 1544f909 2004-12-25 devnull //print("qlock %p @%#x by %p\n", l, pc, l->owner);
279 1544f909 2004-12-25 devnull 		unlock(&l->l);
280 1544f909 2004-12-25 devnull 		return 1;
281 1544f909 2004-12-25 devnull 	}
282 1544f909 2004-12-25 devnull 	if(!block){
283 1544f909 2004-12-25 devnull 		unlock(&l->l);
284 1544f909 2004-12-25 devnull 		return 0;
285 1544f909 2004-12-25 devnull 	}
286 1544f909 2004-12-25 devnull //print("qsleep %p @%#x by %p\n", l, pc, (*threadnow)());
287 1544f909 2004-12-25 devnull 	addthread(&l->waiting, (*threadnow)());
288 1544f909 2004-12-25 devnull 	unlock(&l->l);
289 1544f909 2004-12-25 devnull 
290 1544f909 2004-12-25 devnull 	_threadswitch();
291 1544f909 2004-12-25 devnull 
292 1544f909 2004-12-25 devnull 	if(l->owner != (*threadnow)()){
293 1544f909 2004-12-25 devnull 		fprint(2, "qlock pc=0x%lux owner=%p self=%p oops\n", pc, l->owner, (*threadnow)());
294 1544f909 2004-12-25 devnull 		abort();
295 1544f909 2004-12-25 devnull 	}
296 1544f909 2004-12-25 devnull //print("qlock wakeup %p @%#x by %p\n", l, pc, (*threadnow)());
297 1544f909 2004-12-25 devnull 	return 1;
298 1544f909 2004-12-25 devnull }
299 1544f909 2004-12-25 devnull 
300 1544f909 2004-12-25 devnull static void
301 1544f909 2004-12-25 devnull threadqunlock(QLock *l, ulong pc)
302 1544f909 2004-12-25 devnull {
303 1544f909 2004-12-25 devnull 	lock(&l->l);
304 1544f909 2004-12-25 devnull //print("qlock unlock %p @%#x by %p (owner %p)\n", l, pc, (*threadnow)(), l->owner);
305 1544f909 2004-12-25 devnull 	if(l->owner == nil){
306 1544f909 2004-12-25 devnull 		fprint(2, "qunlock pc=0x%lux owner=%p self=%p oops\n",
307 1544f909 2004-12-25 devnull 			pc, l->owner, (*threadnow)());
308 1544f909 2004-12-25 devnull 		abort();
309 1544f909 2004-12-25 devnull 	}
310 1544f909 2004-12-25 devnull 	if((l->owner = l->waiting.head) != nil){
311 1544f909 2004-12-25 devnull 		delthread(&l->waiting, l->owner);
312 1544f909 2004-12-25 devnull 		_threadready(l->owner);
313 1544f909 2004-12-25 devnull 	}
314 1544f909 2004-12-25 devnull 	unlock(&l->l);
315 1544f909 2004-12-25 devnull }
316 1544f909 2004-12-25 devnull 
317 1544f909 2004-12-25 devnull static int
318 1544f909 2004-12-25 devnull threadrlock(RWLock *l, int block, ulong pc)
319 1544f909 2004-12-25 devnull {
320 1544f909 2004-12-25 devnull 	USED(pc);
321 1544f909 2004-12-25 devnull 
322 1544f909 2004-12-25 devnull 	lock(&l->l);
323 1544f909 2004-12-25 devnull 	if(l->writer == nil && l->wwaiting.head == nil){
324 1544f909 2004-12-25 devnull 		l->readers++;
325 1544f909 2004-12-25 devnull 		unlock(&l->l);
326 1544f909 2004-12-25 devnull 		return 1;
327 1544f909 2004-12-25 devnull 	}
328 1544f909 2004-12-25 devnull 	if(!block){
329 1544f909 2004-12-25 devnull 		unlock(&l->l);
330 1544f909 2004-12-25 devnull 		return 0;
331 1544f909 2004-12-25 devnull 	}
332 1544f909 2004-12-25 devnull 	addthread(&l->rwaiting, (*threadnow)());
333 1544f909 2004-12-25 devnull 	unlock(&l->l);
334 1544f909 2004-12-25 devnull 	_threadswitch();
335 1544f909 2004-12-25 devnull 	return 1;	
336 1544f909 2004-12-25 devnull }
337 1544f909 2004-12-25 devnull 
338 1544f909 2004-12-25 devnull static int
339 1544f909 2004-12-25 devnull threadwlock(RWLock *l, int block, ulong pc)
340 1544f909 2004-12-25 devnull {
341 1544f909 2004-12-25 devnull 	USED(pc);
342 1544f909 2004-12-25 devnull 
343 1544f909 2004-12-25 devnull 	lock(&l->l);
344 1544f909 2004-12-25 devnull 	if(l->writer == nil && l->readers == 0){
345 1544f909 2004-12-25 devnull 		l->writer = (*threadnow)();
346 1544f909 2004-12-25 devnull 		unlock(&l->l);
347 1544f909 2004-12-25 devnull 		return 1;
348 1544f909 2004-12-25 devnull 	}
349 1544f909 2004-12-25 devnull 	if(!block){
350 1544f909 2004-12-25 devnull 		unlock(&l->l);
351 1544f909 2004-12-25 devnull 		return 0;
352 1544f909 2004-12-25 devnull 	}
353 1544f909 2004-12-25 devnull 	addthread(&l->wwaiting, (*threadnow)());
354 1544f909 2004-12-25 devnull 	unlock(&l->l);
355 1544f909 2004-12-25 devnull 	_threadswitch();
356 1544f909 2004-12-25 devnull 	return 1;
357 1544f909 2004-12-25 devnull }
358 1544f909 2004-12-25 devnull 
359 1544f909 2004-12-25 devnull static void
360 1544f909 2004-12-25 devnull threadrunlock(RWLock *l, ulong pc)
361 1544f909 2004-12-25 devnull {
362 1544f909 2004-12-25 devnull 	_Thread *t;
363 1544f909 2004-12-25 devnull 
364 1544f909 2004-12-25 devnull 	USED(pc);
365 1544f909 2004-12-25 devnull 	lock(&l->l);
366 1544f909 2004-12-25 devnull 	--l->readers;
367 1544f909 2004-12-25 devnull 	if(l->readers == 0 && (t = l->wwaiting.head) != nil){
368 1544f909 2004-12-25 devnull 		delthread(&l->wwaiting, t);
369 1544f909 2004-12-25 devnull 		l->writer = t;
370 1544f909 2004-12-25 devnull 		_threadready(t);
371 1544f909 2004-12-25 devnull 	}
372 1544f909 2004-12-25 devnull 	unlock(&l->l);
373 1544f909 2004-12-25 devnull }
374 1544f909 2004-12-25 devnull 
375 1544f909 2004-12-25 devnull static void
376 1544f909 2004-12-25 devnull threadwunlock(RWLock *l, ulong pc)
377 1544f909 2004-12-25 devnull {
378 1544f909 2004-12-25 devnull 	_Thread *t;
379 1544f909 2004-12-25 devnull 
380 1544f909 2004-12-25 devnull 	USED(pc);
381 1544f909 2004-12-25 devnull 	lock(&l->l);
382 1544f909 2004-12-25 devnull 	l->writer = nil;
383 1544f909 2004-12-25 devnull 	assert(l->readers == 0);
384 1544f909 2004-12-25 devnull 	while((t = l->rwaiting.head) != nil){
385 1544f909 2004-12-25 devnull 		delthread(&l->rwaiting, t);
386 1544f909 2004-12-25 devnull 		l->readers++;
387 1544f909 2004-12-25 devnull 		_threadready(t);
388 1544f909 2004-12-25 devnull 	}
389 1544f909 2004-12-25 devnull 	if(l->readers == 0 && (t = l->wwaiting.head) != nil){
390 1544f909 2004-12-25 devnull 		delthread(&l->wwaiting, t);
391 1544f909 2004-12-25 devnull 		l->writer = t;
392 1544f909 2004-12-25 devnull 		_threadready(t);
393 1544f909 2004-12-25 devnull 	}
394 1544f909 2004-12-25 devnull 	unlock(&l->l);
395 1544f909 2004-12-25 devnull }
396 1544f909 2004-12-25 devnull 
397 1544f909 2004-12-25 devnull /*
398 1544f909 2004-12-25 devnull  * sleep and wakeup
399 1544f909 2004-12-25 devnull  */
400 1544f909 2004-12-25 devnull static void
401 1544f909 2004-12-25 devnull threadrsleep(Rendez *r, ulong pc)
402 1544f909 2004-12-25 devnull {
403 1544f909 2004-12-25 devnull 	addthread(&r->waiting, proc()->thread);
404 1544f909 2004-12-25 devnull 	qunlock(r->l);
405 1544f909 2004-12-25 devnull 	_threadswitch();
406 1544f909 2004-12-25 devnull 	qlock(r->l);
407 1544f909 2004-12-25 devnull }
408 1544f909 2004-12-25 devnull 
409 1544f909 2004-12-25 devnull static int
410 1544f909 2004-12-25 devnull threadrwakeup(Rendez *r, int all, ulong pc)
411 1544f909 2004-12-25 devnull {
412 1544f909 2004-12-25 devnull 	int i;
413 1544f909 2004-12-25 devnull 	_Thread *t;
414 1544f909 2004-12-25 devnull 
415 1544f909 2004-12-25 devnull 	for(i=0;; i++){
416 1544f909 2004-12-25 devnull 		if(i==1 && !all)
417 1544f909 2004-12-25 devnull 			break;
418 1544f909 2004-12-25 devnull 		if((t = r->waiting.head) == nil)
419 1544f909 2004-12-25 devnull 			break;
420 1544f909 2004-12-25 devnull 		delthread(&r->waiting, t);
421 1544f909 2004-12-25 devnull 		_threadready(t);	
422 1544f909 2004-12-25 devnull 	}
423 1544f909 2004-12-25 devnull 	return i;
424 1544f909 2004-12-25 devnull }
425 1544f909 2004-12-25 devnull 
426 1544f909 2004-12-25 devnull /*
427 1544f909 2004-12-25 devnull  * hooray for linked lists
428 1544f909 2004-12-25 devnull  */
429 1544f909 2004-12-25 devnull static void
430 1544f909 2004-12-25 devnull addthread(_Threadlist *l, _Thread *t)
431 1544f909 2004-12-25 devnull {
432 1544f909 2004-12-25 devnull 	if(l->tail){
433 1544f909 2004-12-25 devnull 		l->tail->next = t;
434 1544f909 2004-12-25 devnull 		t->prev = l->tail;
435 1544f909 2004-12-25 devnull 	}else{
436 1544f909 2004-12-25 devnull 		l->head = t;
437 1544f909 2004-12-25 devnull 		t->prev = nil;
438 1544f909 2004-12-25 devnull 	}
439 1544f909 2004-12-25 devnull 	l->tail = t;
440 1544f909 2004-12-25 devnull 	t->next = nil;
441 1544f909 2004-12-25 devnull }
442 1544f909 2004-12-25 devnull 
443 1544f909 2004-12-25 devnull static void
444 1544f909 2004-12-25 devnull delthread(_Threadlist *l, _Thread *t)
445 1544f909 2004-12-25 devnull {
446 1544f909 2004-12-25 devnull 	if(t->prev)
447 1544f909 2004-12-25 devnull 		t->prev->next = t->next;
448 1544f909 2004-12-25 devnull 	else
449 1544f909 2004-12-25 devnull 		l->head = t->next;
450 1544f909 2004-12-25 devnull 	if(t->next)
451 1544f909 2004-12-25 devnull 		t->next->prev = t->prev;
452 1544f909 2004-12-25 devnull 	else
453 1544f909 2004-12-25 devnull 		l->tail = t->prev;
454 1544f909 2004-12-25 devnull }
455 1544f909 2004-12-25 devnull 
456 1544f909 2004-12-25 devnull static void
457 1544f909 2004-12-25 devnull addthreadinproc(Proc *p, _Thread *t)
458 1544f909 2004-12-25 devnull {
459 1544f909 2004-12-25 devnull 	_Threadlist *l;
460 1544f909 2004-12-25 devnull 
461 1544f909 2004-12-25 devnull 	l = &p->allthreads;
462 1544f909 2004-12-25 devnull 	if(l->tail){
463 1544f909 2004-12-25 devnull 		l->tail->allnext = t;
464 1544f909 2004-12-25 devnull 		t->allprev = l->tail;
465 1544f909 2004-12-25 devnull 	}else{
466 1544f909 2004-12-25 devnull 		l->head = t;
467 1544f909 2004-12-25 devnull 		t->allprev = nil;
468 1544f909 2004-12-25 devnull 	}
469 1544f909 2004-12-25 devnull 	l->tail = t;
470 1544f909 2004-12-25 devnull 	t->allnext = nil;
471 1544f909 2004-12-25 devnull }
472 1544f909 2004-12-25 devnull 
473 1544f909 2004-12-25 devnull static void
474 1544f909 2004-12-25 devnull delthreadinproc(Proc *p, _Thread *t)
475 1544f909 2004-12-25 devnull {
476 1544f909 2004-12-25 devnull 	_Threadlist *l;
477 1544f909 2004-12-25 devnull 
478 1544f909 2004-12-25 devnull 	l = &p->allthreads;
479 1544f909 2004-12-25 devnull 	if(t->allprev)
480 1544f909 2004-12-25 devnull 		t->allprev->allnext = t->allnext;
481 1544f909 2004-12-25 devnull 	else
482 1544f909 2004-12-25 devnull 		l->head = t->allnext;
483 1544f909 2004-12-25 devnull 	if(t->allnext)
484 1544f909 2004-12-25 devnull 		t->allnext->allprev = t->allprev;
485 1544f909 2004-12-25 devnull 	else
486 1544f909 2004-12-25 devnull 		l->tail = t->allprev;
487 1544f909 2004-12-25 devnull }
488 1544f909 2004-12-25 devnull 
489 1544f909 2004-12-25 devnull void**
490 1544f909 2004-12-25 devnull procdata(void)
491 1544f909 2004-12-25 devnull {
492 1544f909 2004-12-25 devnull 	return &proc()->udata;
493 1544f909 2004-12-25 devnull }
494 1544f909 2004-12-25 devnull 
495 1544f909 2004-12-25 devnull static int threadargc;
496 1544f909 2004-12-25 devnull static char **threadargv;
497 1544f909 2004-12-25 devnull int mainstacksize;
498 1544f909 2004-12-25 devnull 
499 1544f909 2004-12-25 devnull static void
500 1544f909 2004-12-25 devnull threadmainstart(void *v)
501 1544f909 2004-12-25 devnull {
502 1544f909 2004-12-25 devnull 	USED(v);
503 1544f909 2004-12-25 devnull 	threadmain(threadargc, threadargv);
504 1544f909 2004-12-25 devnull }
505 1544f909 2004-12-25 devnull 
506 1544f909 2004-12-25 devnull int
507 1544f909 2004-12-25 devnull main(int argc, char **argv)
508 1544f909 2004-12-25 devnull {
509 1544f909 2004-12-25 devnull 	Proc *p;
510 1544f909 2004-12-25 devnull 
511 1544f909 2004-12-25 devnull 	threadargc = argc;
512 1544f909 2004-12-25 devnull 	threadargv = argv;
513 1544f909 2004-12-25 devnull 
514 1544f909 2004-12-25 devnull 	/*
515 1544f909 2004-12-25 devnull 	 * Install locking routines into C library.
516 1544f909 2004-12-25 devnull 	 */
517 1544f909 2004-12-25 devnull 	_lock = _threadlock;
518 1544f909 2004-12-25 devnull 	_unlock = _threadunlock;
519 1544f909 2004-12-25 devnull 	_qlock = threadqlock;
520 1544f909 2004-12-25 devnull 	_qunlock = threadqunlock;
521 1544f909 2004-12-25 devnull 	_rlock = threadrlock;
522 1544f909 2004-12-25 devnull 	_runlock = threadrunlock;
523 1544f909 2004-12-25 devnull 	_wlock = threadwlock;
524 1544f909 2004-12-25 devnull 	_wunlock = threadwunlock;
525 1544f909 2004-12-25 devnull 	_rsleep = threadrsleep;
526 1544f909 2004-12-25 devnull 	_rwakeup = threadrwakeup;
527 1544f909 2004-12-25 devnull 
528 1544f909 2004-12-25 devnull 	pthreadinit();
529 1544f909 2004-12-25 devnull 	p = procalloc();
530 1544f909 2004-12-25 devnull 	if(mainstacksize == 0)
531 1544f909 2004-12-25 devnull 		mainstacksize = 65536;
532 1544f909 2004-12-25 devnull 	_threadcreate(p, threadmainstart, nil, mainstacksize);
533 1544f909 2004-12-25 devnull 	scheduler(p);
534 1544f909 2004-12-25 devnull 	return 0;	/* not reached */
535 1544f909 2004-12-25 devnull }