1 1544f909 2004-12-25 devnull #include "threadimpl.h"
  2 1544f909 2004-12-25 devnull 
  3 1544f909 2004-12-25 devnull int	_threaddebuglevel;
  4 1544f909 2004-12-25 devnull 
  5 1544f909 2004-12-25 devnull static	uint		threadnproc;
  6 1544f909 2004-12-25 devnull static	uint		threadnsysproc;
  7 1544f909 2004-12-25 devnull static	Lock		threadnproclock;
  8 1544f909 2004-12-25 devnull static	Ref		threadidref;
  9 4dbefdd4 2004-12-27 devnull static	Proc		*threadmainproc;
 10 1544f909 2004-12-25 devnull 
 11 4dbefdd4 2004-12-27 devnull static	void		addproc(Proc*);
 12 4dbefdd4 2004-12-27 devnull static	void		delproc(Proc*);
 13 1544f909 2004-12-25 devnull static	void		addthread(_Threadlist*, _Thread*);
 14 1544f909 2004-12-25 devnull static	void		delthread(_Threadlist*, _Thread*);
 15 1544f909 2004-12-25 devnull static	void		addthreadinproc(Proc*, _Thread*);
 16 1544f909 2004-12-25 devnull static	void		delthreadinproc(Proc*, _Thread*);
 17 1544f909 2004-12-25 devnull static	void		contextswitch(Context *from, Context *to);
 18 73722a8b 2004-12-27 devnull static	void		scheduler(Proc*);
 19 1544f909 2004-12-25 devnull 
 20 2c87dda8 2004-12-28 devnull static void
 21 2c87dda8 2004-12-28 devnull _threaddebug(char *fmt, ...)
 22 2c87dda8 2004-12-28 devnull {
 23 2c87dda8 2004-12-28 devnull 	va_list arg;
 24 2c87dda8 2004-12-28 devnull 	char buf[128];
 25 2c87dda8 2004-12-28 devnull 	_Thread *t;
 26 af89fc10 2005-01-06 devnull 	char *p;
 27 af89fc10 2005-01-06 devnull 	static int fd = -1;
 28 2c87dda8 2004-12-28 devnull 
 29 af89fc10 2005-01-06 devnull return;
 30 af89fc10 2005-01-06 devnull 	if(fd < 0){
 31 af89fc10 2005-01-06 devnull 		p = strrchr(argv0, '/');
 32 af89fc10 2005-01-06 devnull 		if(p)
 33 af89fc10 2005-01-06 devnull 			p++;
 34 af89fc10 2005-01-06 devnull 		else
 35 af89fc10 2005-01-06 devnull 			p = argv0;
 36 af89fc10 2005-01-06 devnull 		snprint(buf, sizeof buf, "/tmp/%s.tlog", p);
 37 af89fc10 2005-01-06 devnull 		if((fd = create(buf, OWRITE, 0666)) < 0)
 38 af89fc10 2005-01-06 devnull 			fd = open("/dev/null", OWRITE);
 39 af89fc10 2005-01-06 devnull 	}
 40 2c87dda8 2004-12-28 devnull 
 41 2c87dda8 2004-12-28 devnull 	va_start(arg, fmt);
 42 2c87dda8 2004-12-28 devnull 	vsnprint(buf, sizeof buf, fmt, arg);
 43 2c87dda8 2004-12-28 devnull 	va_end(arg);
 44 2c87dda8 2004-12-28 devnull 	t = proc()->thread;
 45 2c87dda8 2004-12-28 devnull 	if(t)
 46 af89fc10 2005-01-06 devnull 		fprint(fd, "%d.%d: %s\n", getpid(), t->id, buf);
 47 2c87dda8 2004-12-28 devnull 	else
 48 af89fc10 2005-01-06 devnull 		fprint(fd, "%d._: %s\n", getpid(), buf);
 49 2c87dda8 2004-12-28 devnull }
 50 2c87dda8 2004-12-28 devnull 
 51 1544f909 2004-12-25 devnull static _Thread*
 52 1544f909 2004-12-25 devnull getthreadnow(void)
 53 1544f909 2004-12-25 devnull {
 54 1544f909 2004-12-25 devnull 	return proc()->thread;
 55 1544f909 2004-12-25 devnull }
 56 1544f909 2004-12-25 devnull _Thread	*(*threadnow)(void) = getthreadnow;
 57 1544f909 2004-12-25 devnull 
 58 1544f909 2004-12-25 devnull static Proc*
 59 1544f909 2004-12-25 devnull procalloc(void)
 60 1544f909 2004-12-25 devnull {
 61 1544f909 2004-12-25 devnull 	Proc *p;
 62 1544f909 2004-12-25 devnull 
 63 1544f909 2004-12-25 devnull 	p = malloc(sizeof *p);
 64 73722a8b 2004-12-27 devnull 	if(p == nil)
 65 73722a8b 2004-12-27 devnull 		sysfatal("procalloc malloc: %r");
 66 1544f909 2004-12-25 devnull 	memset(p, 0, sizeof *p);
 67 4dbefdd4 2004-12-27 devnull 	addproc(p);
 68 1544f909 2004-12-25 devnull 	lock(&threadnproclock);
 69 1544f909 2004-12-25 devnull 	threadnproc++;
 70 1544f909 2004-12-25 devnull 	unlock(&threadnproclock);
 71 1544f909 2004-12-25 devnull 	return p;
 72 1544f909 2004-12-25 devnull }
 73 1544f909 2004-12-25 devnull 
 74 1544f909 2004-12-25 devnull static void
 75 1544f909 2004-12-25 devnull threadstart(void *v)
 76 1544f909 2004-12-25 devnull {
 77 1544f909 2004-12-25 devnull 	_Thread *t;
 78 1544f909 2004-12-25 devnull 
 79 1544f909 2004-12-25 devnull 	t = v;
 80 1544f909 2004-12-25 devnull 	t->startfn(t->startarg);
 81 2c87dda8 2004-12-28 devnull 	memset(&v, 0xff, 32);	/* try to cut off stack traces */
 82 4dbefdd4 2004-12-27 devnull 	threadexits(nil);
 83 1544f909 2004-12-25 devnull }
 84 1544f909 2004-12-25 devnull 
 85 1544f909 2004-12-25 devnull static _Thread*
 86 1544f909 2004-12-25 devnull threadalloc(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 	sigset_t zero;
 90 1544f909 2004-12-25 devnull 
 91 1544f909 2004-12-25 devnull 	/* allocate the task and stack together */
 92 1544f909 2004-12-25 devnull 	t = malloc(sizeof *t+stack);
 93 73722a8b 2004-12-27 devnull 	if(t == nil)
 94 73722a8b 2004-12-27 devnull 		sysfatal("threadalloc malloc: %r");
 95 1544f909 2004-12-25 devnull 	memset(t, 0, sizeof *t);
 96 1544f909 2004-12-25 devnull 	t->stk = (uchar*)(t+1);
 97 1544f909 2004-12-25 devnull 	t->stksize = stack;
 98 1544f909 2004-12-25 devnull 	t->id = incref(&threadidref);
 99 1544f909 2004-12-25 devnull 	t->startfn = fn;
100 1544f909 2004-12-25 devnull 	t->startarg = arg;
101 1544f909 2004-12-25 devnull 
102 1544f909 2004-12-25 devnull 	/* do a reasonable initialization */
103 1544f909 2004-12-25 devnull 	memset(&t->context.uc, 0, sizeof t->context.uc);
104 1544f909 2004-12-25 devnull 	sigemptyset(&zero);
105 1544f909 2004-12-25 devnull 	sigprocmask(SIG_BLOCK, &zero, &t->context.uc.uc_sigmask);
106 1544f909 2004-12-25 devnull 
107 d54ead7f 2004-12-28 devnull 	/* must initialize with current context */
108 1544f909 2004-12-25 devnull 	getcontext(&t->context.uc);
109 1544f909 2004-12-25 devnull 
110 1544f909 2004-12-25 devnull 	/* call makecontext to do the real work. */
111 1544f909 2004-12-25 devnull 	/* leave a few words open on both ends */
112 1544f909 2004-12-25 devnull 	t->context.uc.uc_stack.ss_sp = t->stk+8;
113 2c87dda8 2004-12-28 devnull 	t->context.uc.uc_stack.ss_size = t->stksize-64;
114 1544f909 2004-12-25 devnull 	makecontext(&t->context.uc, (void(*)())threadstart, 1, t);
115 1544f909 2004-12-25 devnull 
116 1544f909 2004-12-25 devnull 	return t;
117 1544f909 2004-12-25 devnull }
118 1544f909 2004-12-25 devnull 
119 1544f909 2004-12-25 devnull _Thread*
120 1544f909 2004-12-25 devnull _threadcreate(Proc *p, void (*fn)(void*), void *arg, uint stack)
121 1544f909 2004-12-25 devnull {
122 1544f909 2004-12-25 devnull 	_Thread *t;
123 1544f909 2004-12-25 devnull 
124 1544f909 2004-12-25 devnull 	t = threadalloc(fn, arg, stack);
125 1544f909 2004-12-25 devnull 	t->proc = p;
126 1544f909 2004-12-25 devnull 	addthreadinproc(p, t);
127 1544f909 2004-12-25 devnull 	p->nthread++;
128 1544f909 2004-12-25 devnull 	_threadready(t);
129 1544f909 2004-12-25 devnull 	return t;
130 1544f909 2004-12-25 devnull }
131 1544f909 2004-12-25 devnull 
132 1544f909 2004-12-25 devnull int
133 1544f909 2004-12-25 devnull threadcreate(void (*fn)(void*), void *arg, uint stack)
134 1544f909 2004-12-25 devnull {
135 1544f909 2004-12-25 devnull 	_Thread *t;
136 1544f909 2004-12-25 devnull 
137 1544f909 2004-12-25 devnull 	t = _threadcreate(proc(), fn, arg, stack);
138 1544f909 2004-12-25 devnull 	return t->id;
139 1544f909 2004-12-25 devnull }
140 1544f909 2004-12-25 devnull 
141 1544f909 2004-12-25 devnull int
142 1544f909 2004-12-25 devnull proccreate(void (*fn)(void*), void *arg, uint stack)
143 1544f909 2004-12-25 devnull {
144 1544f909 2004-12-25 devnull 	_Thread *t;
145 1544f909 2004-12-25 devnull 	Proc *p;
146 1544f909 2004-12-25 devnull 
147 1544f909 2004-12-25 devnull 	p = procalloc();
148 1544f909 2004-12-25 devnull 	t = _threadcreate(p, fn, arg, stack);
149 1544f909 2004-12-25 devnull 	_procstart(p, scheduler);
150 1544f909 2004-12-25 devnull 	return t->id;
151 1544f909 2004-12-25 devnull }
152 1544f909 2004-12-25 devnull 
153 1544f909 2004-12-25 devnull void
154 1544f909 2004-12-25 devnull _threadswitch(void)
155 1544f909 2004-12-25 devnull {
156 1544f909 2004-12-25 devnull 	Proc *p;
157 1544f909 2004-12-25 devnull 
158 1544f909 2004-12-25 devnull 	p = proc();
159 1544f909 2004-12-25 devnull 	contextswitch(&p->thread->context, &p->schedcontext);
160 1544f909 2004-12-25 devnull }
161 1544f909 2004-12-25 devnull 
162 1544f909 2004-12-25 devnull void
163 1544f909 2004-12-25 devnull _threadready(_Thread *t)
164 1544f909 2004-12-25 devnull {
165 1544f909 2004-12-25 devnull 	Proc *p;
166 1544f909 2004-12-25 devnull 
167 1544f909 2004-12-25 devnull 	p = t->proc;
168 1544f909 2004-12-25 devnull 	lock(&p->lock);
169 a0a331aa 2005-01-06 devnull 	p->runrend.l = &p->lock;
170 1544f909 2004-12-25 devnull 	addthread(&p->runqueue, t);
171 8cbd854a 2004-12-27 devnull //print("%d wake for job %d->%d\n", time(0), getpid(), p->osprocid);
172 8cbd854a 2004-12-27 devnull 	if(p != proc())
173 a0a331aa 2005-01-06 devnull 		_procwakeupandunlock(&p->runrend);
174 a0a331aa 2005-01-06 devnull 	else
175 a0a331aa 2005-01-06 devnull 		unlock(&p->lock);
176 1544f909 2004-12-25 devnull }
177 1544f909 2004-12-25 devnull 
178 8cbd854a 2004-12-27 devnull int
179 1544f909 2004-12-25 devnull threadyield(void)
180 1544f909 2004-12-25 devnull {
181 8cbd854a 2004-12-27 devnull 	int n;
182 8cbd854a 2004-12-27 devnull 	Proc *p;
183 8cbd854a 2004-12-27 devnull 
184 8cbd854a 2004-12-27 devnull 	p = proc();
185 8cbd854a 2004-12-27 devnull 	n = p->nswitch;
186 8cbd854a 2004-12-27 devnull 	_threadready(p->thread);
187 1544f909 2004-12-25 devnull 	_threadswitch();
188 8cbd854a 2004-12-27 devnull 	return p->nswitch - n;
189 1544f909 2004-12-25 devnull }
190 1544f909 2004-12-25 devnull 
191 1544f909 2004-12-25 devnull void
192 1544f909 2004-12-25 devnull threadexits(char *msg)
193 1544f909 2004-12-25 devnull {
194 1544f909 2004-12-25 devnull 	Proc *p;
195 1544f909 2004-12-25 devnull 
196 1544f909 2004-12-25 devnull 	p = proc();
197 4dbefdd4 2004-12-27 devnull 	if(msg == nil)
198 4dbefdd4 2004-12-27 devnull 		msg = "";
199 1544f909 2004-12-25 devnull 	utfecpy(p->msg, p->msg+sizeof p->msg, msg);
200 4dbefdd4 2004-12-27 devnull 	proc()->thread->exiting = 1;
201 4dbefdd4 2004-12-27 devnull 	_threadswitch();
202 1544f909 2004-12-25 devnull }
203 1544f909 2004-12-25 devnull 
204 1544f909 2004-12-25 devnull static void
205 1544f909 2004-12-25 devnull contextswitch(Context *from, Context *to)
206 1544f909 2004-12-25 devnull {
207 1544f909 2004-12-25 devnull 	if(swapcontext(&from->uc, &to->uc) < 0){
208 1544f909 2004-12-25 devnull 		fprint(2, "swapcontext failed: %r\n");
209 1544f909 2004-12-25 devnull 		assert(0);
210 1544f909 2004-12-25 devnull 	}
211 1544f909 2004-12-25 devnull }
212 1544f909 2004-12-25 devnull 
213 1544f909 2004-12-25 devnull static void
214 73722a8b 2004-12-27 devnull scheduler(Proc *p)
215 1544f909 2004-12-25 devnull {
216 1544f909 2004-12-25 devnull 	_Thread *t;
217 1544f909 2004-12-25 devnull 
218 1544f909 2004-12-25 devnull 	setproc(p);
219 2c87dda8 2004-12-28 devnull 	_threaddebug("scheduler enter");
220 e1dc7e45 2004-12-27 devnull 	// print("s %p %d\n", p, gettid());
221 1544f909 2004-12-25 devnull 	lock(&p->lock);
222 1544f909 2004-12-25 devnull 	for(;;){
223 1544f909 2004-12-25 devnull 		while((t = p->runqueue.head) == nil){
224 1544f909 2004-12-25 devnull 			if(p->nthread == 0)
225 1544f909 2004-12-25 devnull 				goto Out;
226 1544f909 2004-12-25 devnull 			p->runrend.l = &p->lock;
227 2c87dda8 2004-12-28 devnull 			_threaddebug("scheduler sleep");
228 1544f909 2004-12-25 devnull 			_procsleep(&p->runrend);
229 2c87dda8 2004-12-28 devnull 			_threaddebug("scheduler wake");
230 1544f909 2004-12-25 devnull 		}
231 1544f909 2004-12-25 devnull 		delthread(&p->runqueue, t);
232 1544f909 2004-12-25 devnull 		unlock(&p->lock);
233 1544f909 2004-12-25 devnull 		p->thread = t;
234 8cbd854a 2004-12-27 devnull 		p->nswitch++;
235 2c87dda8 2004-12-28 devnull 		_threaddebug("run %d (%s)", t->id, t->name);
236 1544f909 2004-12-25 devnull 		contextswitch(&p->schedcontext, &t->context);
237 1544f909 2004-12-25 devnull 		p->thread = nil;
238 1544f909 2004-12-25 devnull 		lock(&p->lock);
239 1544f909 2004-12-25 devnull 		if(t->exiting){
240 1544f909 2004-12-25 devnull 			delthreadinproc(p, t);
241 1544f909 2004-12-25 devnull 			p->nthread--;
242 1544f909 2004-12-25 devnull 			free(t);
243 1544f909 2004-12-25 devnull 		}
244 1544f909 2004-12-25 devnull 	}
245 1544f909 2004-12-25 devnull 
246 1544f909 2004-12-25 devnull Out:
247 2c87dda8 2004-12-28 devnull 	_threaddebug("scheduler exit");
248 4dbefdd4 2004-12-27 devnull 	delproc(p);
249 1544f909 2004-12-25 devnull 	lock(&threadnproclock);
250 1544f909 2004-12-25 devnull 	if(p->sysproc)
251 1544f909 2004-12-25 devnull 		--threadnsysproc;
252 1544f909 2004-12-25 devnull 	if(--threadnproc == threadnsysproc)
253 4dbefdd4 2004-12-27 devnull 		threadexitsall(p->msg);
254 1544f909 2004-12-25 devnull 	unlock(&threadnproclock);
255 1544f909 2004-12-25 devnull 	unlock(&p->lock);
256 1544f909 2004-12-25 devnull 	free(p);
257 1544f909 2004-12-25 devnull 	setproc(0);
258 1544f909 2004-12-25 devnull }
259 1544f909 2004-12-25 devnull 
260 1544f909 2004-12-25 devnull void
261 1544f909 2004-12-25 devnull _threadsetsysproc(void)
262 1544f909 2004-12-25 devnull {
263 1544f909 2004-12-25 devnull 	lock(&threadnproclock);
264 1544f909 2004-12-25 devnull 	if(++threadnsysproc == threadnproc)
265 1544f909 2004-12-25 devnull 		exit(0);
266 1544f909 2004-12-25 devnull 	unlock(&threadnproclock);
267 1544f909 2004-12-25 devnull 	proc()->sysproc = 1;
268 1544f909 2004-12-25 devnull }
269 1544f909 2004-12-25 devnull 
270 4dbefdd4 2004-12-27 devnull void**
271 4dbefdd4 2004-12-27 devnull procdata(void)
272 4dbefdd4 2004-12-27 devnull {
273 4dbefdd4 2004-12-27 devnull 	return &proc()->udata;
274 4dbefdd4 2004-12-27 devnull }
275 4dbefdd4 2004-12-27 devnull 
276 4dbefdd4 2004-12-27 devnull extern Jmp *(*_notejmpbuf)(void);
277 4dbefdd4 2004-12-27 devnull static Jmp*
278 4dbefdd4 2004-12-27 devnull threadnotejmp(void)
279 4dbefdd4 2004-12-27 devnull {
280 4dbefdd4 2004-12-27 devnull 	return &proc()->sigjmp;
281 4dbefdd4 2004-12-27 devnull }
282 4dbefdd4 2004-12-27 devnull 
283 1544f909 2004-12-25 devnull /*
284 1544f909 2004-12-25 devnull  * debugging
285 1544f909 2004-12-25 devnull  */
286 1544f909 2004-12-25 devnull void
287 1544f909 2004-12-25 devnull threadsetname(char *fmt, ...)
288 1544f909 2004-12-25 devnull {
289 1544f909 2004-12-25 devnull 	va_list arg;
290 1544f909 2004-12-25 devnull 	_Thread *t;
291 1544f909 2004-12-25 devnull 
292 1544f909 2004-12-25 devnull 	t = proc()->thread;
293 1544f909 2004-12-25 devnull 	va_start(arg, fmt);
294 1544f909 2004-12-25 devnull 	vsnprint(t->name, sizeof t->name, fmt, arg);
295 1544f909 2004-12-25 devnull 	va_end(arg);
296 1544f909 2004-12-25 devnull }
297 1544f909 2004-12-25 devnull 
298 1544f909 2004-12-25 devnull void
299 1544f909 2004-12-25 devnull threadsetstate(char *fmt, ...)
300 1544f909 2004-12-25 devnull {
301 1544f909 2004-12-25 devnull 	va_list arg;
302 1544f909 2004-12-25 devnull 	_Thread *t;
303 1544f909 2004-12-25 devnull 
304 1544f909 2004-12-25 devnull 	t = proc()->thread;
305 1544f909 2004-12-25 devnull 	va_start(arg, fmt);
306 1544f909 2004-12-25 devnull 	vsnprint(t->state, sizeof t->name, fmt, arg);
307 1544f909 2004-12-25 devnull 	va_end(arg);
308 1544f909 2004-12-25 devnull }
309 1544f909 2004-12-25 devnull 
310 1544f909 2004-12-25 devnull /*
311 1544f909 2004-12-25 devnull  * locking
312 1544f909 2004-12-25 devnull  */
313 1544f909 2004-12-25 devnull static int
314 1544f909 2004-12-25 devnull threadqlock(QLock *l, int block, ulong pc)
315 1544f909 2004-12-25 devnull {
316 1544f909 2004-12-25 devnull 	lock(&l->l);
317 1544f909 2004-12-25 devnull 	if(l->owner == nil){
318 1544f909 2004-12-25 devnull 		l->owner = (*threadnow)();
319 1544f909 2004-12-25 devnull //print("qlock %p @%#x by %p\n", l, pc, l->owner);
320 1544f909 2004-12-25 devnull 		unlock(&l->l);
321 1544f909 2004-12-25 devnull 		return 1;
322 1544f909 2004-12-25 devnull 	}
323 1544f909 2004-12-25 devnull 	if(!block){
324 1544f909 2004-12-25 devnull 		unlock(&l->l);
325 1544f909 2004-12-25 devnull 		return 0;
326 1544f909 2004-12-25 devnull 	}
327 1544f909 2004-12-25 devnull //print("qsleep %p @%#x by %p\n", l, pc, (*threadnow)());
328 1544f909 2004-12-25 devnull 	addthread(&l->waiting, (*threadnow)());
329 1544f909 2004-12-25 devnull 	unlock(&l->l);
330 1544f909 2004-12-25 devnull 
331 1544f909 2004-12-25 devnull 	_threadswitch();
332 1544f909 2004-12-25 devnull 
333 1544f909 2004-12-25 devnull 	if(l->owner != (*threadnow)()){
334 15cd8255 2005-01-04 devnull 		fprint(2, "%s: qlock pc=0x%lux owner=%p self=%p oops\n",
335 15cd8255 2005-01-04 devnull 			argv0, pc, l->owner, (*threadnow)());
336 1544f909 2004-12-25 devnull 		abort();
337 1544f909 2004-12-25 devnull 	}
338 1544f909 2004-12-25 devnull //print("qlock wakeup %p @%#x by %p\n", l, pc, (*threadnow)());
339 1544f909 2004-12-25 devnull 	return 1;
340 1544f909 2004-12-25 devnull }
341 1544f909 2004-12-25 devnull 
342 1544f909 2004-12-25 devnull static void
343 1544f909 2004-12-25 devnull threadqunlock(QLock *l, ulong pc)
344 1544f909 2004-12-25 devnull {
345 1544f909 2004-12-25 devnull 	lock(&l->l);
346 1544f909 2004-12-25 devnull //print("qlock unlock %p @%#x by %p (owner %p)\n", l, pc, (*threadnow)(), l->owner);
347 15cd8255 2005-01-04 devnull 	if(l->owner != (*threadnow)()){
348 15cd8255 2005-01-04 devnull 		fprint(2, "%s: qunlock pc=0x%lux owner=%p self=%p oops\n",
349 15cd8255 2005-01-04 devnull 			argv0, pc, l->owner, (*threadnow)());
350 1544f909 2004-12-25 devnull 	}
351 1544f909 2004-12-25 devnull 	if((l->owner = l->waiting.head) != nil){
352 1544f909 2004-12-25 devnull 		delthread(&l->waiting, l->owner);
353 1544f909 2004-12-25 devnull 		_threadready(l->owner);
354 1544f909 2004-12-25 devnull 	}
355 1544f909 2004-12-25 devnull 	unlock(&l->l);
356 1544f909 2004-12-25 devnull }
357 1544f909 2004-12-25 devnull 
358 1544f909 2004-12-25 devnull static int
359 1544f909 2004-12-25 devnull threadrlock(RWLock *l, int block, ulong pc)
360 1544f909 2004-12-25 devnull {
361 1544f909 2004-12-25 devnull 	USED(pc);
362 1544f909 2004-12-25 devnull 
363 1544f909 2004-12-25 devnull 	lock(&l->l);
364 1544f909 2004-12-25 devnull 	if(l->writer == nil && l->wwaiting.head == nil){
365 1544f909 2004-12-25 devnull 		l->readers++;
366 1544f909 2004-12-25 devnull 		unlock(&l->l);
367 1544f909 2004-12-25 devnull 		return 1;
368 1544f909 2004-12-25 devnull 	}
369 1544f909 2004-12-25 devnull 	if(!block){
370 1544f909 2004-12-25 devnull 		unlock(&l->l);
371 1544f909 2004-12-25 devnull 		return 0;
372 1544f909 2004-12-25 devnull 	}
373 1544f909 2004-12-25 devnull 	addthread(&l->rwaiting, (*threadnow)());
374 1544f909 2004-12-25 devnull 	unlock(&l->l);
375 1544f909 2004-12-25 devnull 	_threadswitch();
376 1544f909 2004-12-25 devnull 	return 1;	
377 1544f909 2004-12-25 devnull }
378 1544f909 2004-12-25 devnull 
379 1544f909 2004-12-25 devnull static int
380 1544f909 2004-12-25 devnull threadwlock(RWLock *l, int block, ulong pc)
381 1544f909 2004-12-25 devnull {
382 1544f909 2004-12-25 devnull 	USED(pc);
383 1544f909 2004-12-25 devnull 
384 1544f909 2004-12-25 devnull 	lock(&l->l);
385 1544f909 2004-12-25 devnull 	if(l->writer == nil && l->readers == 0){
386 1544f909 2004-12-25 devnull 		l->writer = (*threadnow)();
387 1544f909 2004-12-25 devnull 		unlock(&l->l);
388 1544f909 2004-12-25 devnull 		return 1;
389 1544f909 2004-12-25 devnull 	}
390 1544f909 2004-12-25 devnull 	if(!block){
391 1544f909 2004-12-25 devnull 		unlock(&l->l);
392 1544f909 2004-12-25 devnull 		return 0;
393 1544f909 2004-12-25 devnull 	}
394 1544f909 2004-12-25 devnull 	addthread(&l->wwaiting, (*threadnow)());
395 1544f909 2004-12-25 devnull 	unlock(&l->l);
396 1544f909 2004-12-25 devnull 	_threadswitch();
397 1544f909 2004-12-25 devnull 	return 1;
398 1544f909 2004-12-25 devnull }
399 1544f909 2004-12-25 devnull 
400 1544f909 2004-12-25 devnull static void
401 1544f909 2004-12-25 devnull threadrunlock(RWLock *l, ulong pc)
402 1544f909 2004-12-25 devnull {
403 1544f909 2004-12-25 devnull 	_Thread *t;
404 1544f909 2004-12-25 devnull 
405 1544f909 2004-12-25 devnull 	USED(pc);
406 1544f909 2004-12-25 devnull 	lock(&l->l);
407 1544f909 2004-12-25 devnull 	--l->readers;
408 1544f909 2004-12-25 devnull 	if(l->readers == 0 && (t = l->wwaiting.head) != nil){
409 1544f909 2004-12-25 devnull 		delthread(&l->wwaiting, t);
410 1544f909 2004-12-25 devnull 		l->writer = t;
411 1544f909 2004-12-25 devnull 		_threadready(t);
412 1544f909 2004-12-25 devnull 	}
413 1544f909 2004-12-25 devnull 	unlock(&l->l);
414 1544f909 2004-12-25 devnull }
415 1544f909 2004-12-25 devnull 
416 1544f909 2004-12-25 devnull static void
417 1544f909 2004-12-25 devnull threadwunlock(RWLock *l, ulong pc)
418 1544f909 2004-12-25 devnull {
419 1544f909 2004-12-25 devnull 	_Thread *t;
420 1544f909 2004-12-25 devnull 
421 1544f909 2004-12-25 devnull 	USED(pc);
422 1544f909 2004-12-25 devnull 	lock(&l->l);
423 1544f909 2004-12-25 devnull 	l->writer = nil;
424 1544f909 2004-12-25 devnull 	assert(l->readers == 0);
425 1544f909 2004-12-25 devnull 	while((t = l->rwaiting.head) != nil){
426 1544f909 2004-12-25 devnull 		delthread(&l->rwaiting, t);
427 1544f909 2004-12-25 devnull 		l->readers++;
428 1544f909 2004-12-25 devnull 		_threadready(t);
429 1544f909 2004-12-25 devnull 	}
430 1544f909 2004-12-25 devnull 	if(l->readers == 0 && (t = l->wwaiting.head) != nil){
431 1544f909 2004-12-25 devnull 		delthread(&l->wwaiting, t);
432 1544f909 2004-12-25 devnull 		l->writer = t;
433 1544f909 2004-12-25 devnull 		_threadready(t);
434 1544f909 2004-12-25 devnull 	}
435 1544f909 2004-12-25 devnull 	unlock(&l->l);
436 1544f909 2004-12-25 devnull }
437 1544f909 2004-12-25 devnull 
438 1544f909 2004-12-25 devnull /*
439 1544f909 2004-12-25 devnull  * sleep and wakeup
440 1544f909 2004-12-25 devnull  */
441 1544f909 2004-12-25 devnull static void
442 1544f909 2004-12-25 devnull threadrsleep(Rendez *r, ulong pc)
443 1544f909 2004-12-25 devnull {
444 1544f909 2004-12-25 devnull 	addthread(&r->waiting, proc()->thread);
445 1544f909 2004-12-25 devnull 	qunlock(r->l);
446 1544f909 2004-12-25 devnull 	_threadswitch();
447 1544f909 2004-12-25 devnull 	qlock(r->l);
448 1544f909 2004-12-25 devnull }
449 1544f909 2004-12-25 devnull 
450 1544f909 2004-12-25 devnull static int
451 1544f909 2004-12-25 devnull threadrwakeup(Rendez *r, int all, ulong pc)
452 1544f909 2004-12-25 devnull {
453 1544f909 2004-12-25 devnull 	int i;
454 1544f909 2004-12-25 devnull 	_Thread *t;
455 1544f909 2004-12-25 devnull 
456 1544f909 2004-12-25 devnull 	for(i=0;; i++){
457 1544f909 2004-12-25 devnull 		if(i==1 && !all)
458 1544f909 2004-12-25 devnull 			break;
459 1544f909 2004-12-25 devnull 		if((t = r->waiting.head) == nil)
460 1544f909 2004-12-25 devnull 			break;
461 1544f909 2004-12-25 devnull 		delthread(&r->waiting, t);
462 1544f909 2004-12-25 devnull 		_threadready(t);	
463 1544f909 2004-12-25 devnull 	}
464 1544f909 2004-12-25 devnull 	return i;
465 1544f909 2004-12-25 devnull }
466 1544f909 2004-12-25 devnull 
467 1544f909 2004-12-25 devnull /*
468 4dbefdd4 2004-12-27 devnull  * startup
469 4dbefdd4 2004-12-27 devnull  */
470 4dbefdd4 2004-12-27 devnull 
471 4dbefdd4 2004-12-27 devnull static int threadargc;
472 4dbefdd4 2004-12-27 devnull static char **threadargv;
473 4dbefdd4 2004-12-27 devnull int mainstacksize;
474 4dbefdd4 2004-12-27 devnull 
475 4dbefdd4 2004-12-27 devnull static void
476 4dbefdd4 2004-12-27 devnull threadmainstart(void *v)
477 4dbefdd4 2004-12-27 devnull {
478 4dbefdd4 2004-12-27 devnull 	USED(v);
479 4dbefdd4 2004-12-27 devnull 	threadmainproc = proc();
480 4dbefdd4 2004-12-27 devnull 	threadmain(threadargc, threadargv);
481 2c87dda8 2004-12-28 devnull }
482 2c87dda8 2004-12-28 devnull 
483 2c87dda8 2004-12-28 devnull void
484 2c87dda8 2004-12-28 devnull threadlinklibrary(void)
485 2c87dda8 2004-12-28 devnull {
486 4dbefdd4 2004-12-27 devnull }
487 4dbefdd4 2004-12-27 devnull 
488 4dbefdd4 2004-12-27 devnull int
489 4dbefdd4 2004-12-27 devnull main(int argc, char **argv)
490 4dbefdd4 2004-12-27 devnull {
491 4dbefdd4 2004-12-27 devnull 	Proc *p;
492 1d2533d0 2004-12-28 devnull 
493 1d2533d0 2004-12-28 devnull 	argv0 = argv[0];
494 4dbefdd4 2004-12-27 devnull 
495 2c87dda8 2004-12-28 devnull 	_threadsetupdaemonize();
496 2c87dda8 2004-12-28 devnull 
497 4dbefdd4 2004-12-27 devnull 	threadargc = argc;
498 4dbefdd4 2004-12-27 devnull 	threadargv = argv;
499 4dbefdd4 2004-12-27 devnull 
500 4dbefdd4 2004-12-27 devnull 	/*
501 4dbefdd4 2004-12-27 devnull 	 * Install locking routines into C library.
502 4dbefdd4 2004-12-27 devnull 	 */
503 4dbefdd4 2004-12-27 devnull 	_lock = _threadlock;
504 4dbefdd4 2004-12-27 devnull 	_unlock = _threadunlock;
505 4dbefdd4 2004-12-27 devnull 	_qlock = threadqlock;
506 4dbefdd4 2004-12-27 devnull 	_qunlock = threadqunlock;
507 4dbefdd4 2004-12-27 devnull 	_rlock = threadrlock;
508 4dbefdd4 2004-12-27 devnull 	_runlock = threadrunlock;
509 4dbefdd4 2004-12-27 devnull 	_wlock = threadwlock;
510 4dbefdd4 2004-12-27 devnull 	_wunlock = threadwunlock;
511 4dbefdd4 2004-12-27 devnull 	_rsleep = threadrsleep;
512 4dbefdd4 2004-12-27 devnull 	_rwakeup = threadrwakeup;
513 4dbefdd4 2004-12-27 devnull 	_notejmpbuf = threadnotejmp;
514 4dbefdd4 2004-12-27 devnull 
515 4dbefdd4 2004-12-27 devnull 	_pthreadinit();
516 4dbefdd4 2004-12-27 devnull 	p = procalloc();
517 4dbefdd4 2004-12-27 devnull 	_threadsetproc(p);
518 4dbefdd4 2004-12-27 devnull 	if(mainstacksize == 0)
519 4dbefdd4 2004-12-27 devnull 		mainstacksize = 65536;
520 4dbefdd4 2004-12-27 devnull 	_threadcreate(p, threadmainstart, nil, mainstacksize);
521 4dbefdd4 2004-12-27 devnull 	scheduler(p);
522 15cd8255 2005-01-04 devnull 	_threaddaemonize();
523 1d2533d0 2004-12-28 devnull 	_threadpexit();
524 15cd8255 2005-01-04 devnull 	return 0;
525 4dbefdd4 2004-12-27 devnull }
526 4dbefdd4 2004-12-27 devnull 
527 4dbefdd4 2004-12-27 devnull /*
528 1544f909 2004-12-25 devnull  * hooray for linked lists
529 1544f909 2004-12-25 devnull  */
530 1544f909 2004-12-25 devnull static void
531 1544f909 2004-12-25 devnull addthread(_Threadlist *l, _Thread *t)
532 1544f909 2004-12-25 devnull {
533 1544f909 2004-12-25 devnull 	if(l->tail){
534 1544f909 2004-12-25 devnull 		l->tail->next = t;
535 1544f909 2004-12-25 devnull 		t->prev = l->tail;
536 1544f909 2004-12-25 devnull 	}else{
537 1544f909 2004-12-25 devnull 		l->head = t;
538 1544f909 2004-12-25 devnull 		t->prev = nil;
539 1544f909 2004-12-25 devnull 	}
540 1544f909 2004-12-25 devnull 	l->tail = t;
541 1544f909 2004-12-25 devnull 	t->next = nil;
542 1544f909 2004-12-25 devnull }
543 1544f909 2004-12-25 devnull 
544 1544f909 2004-12-25 devnull static void
545 1544f909 2004-12-25 devnull delthread(_Threadlist *l, _Thread *t)
546 1544f909 2004-12-25 devnull {
547 1544f909 2004-12-25 devnull 	if(t->prev)
548 1544f909 2004-12-25 devnull 		t->prev->next = t->next;
549 1544f909 2004-12-25 devnull 	else
550 1544f909 2004-12-25 devnull 		l->head = t->next;
551 1544f909 2004-12-25 devnull 	if(t->next)
552 1544f909 2004-12-25 devnull 		t->next->prev = t->prev;
553 1544f909 2004-12-25 devnull 	else
554 1544f909 2004-12-25 devnull 		l->tail = t->prev;
555 1544f909 2004-12-25 devnull }
556 1544f909 2004-12-25 devnull 
557 1544f909 2004-12-25 devnull static void
558 1544f909 2004-12-25 devnull addthreadinproc(Proc *p, _Thread *t)
559 1544f909 2004-12-25 devnull {
560 1544f909 2004-12-25 devnull 	_Threadlist *l;
561 1544f909 2004-12-25 devnull 
562 1544f909 2004-12-25 devnull 	l = &p->allthreads;
563 1544f909 2004-12-25 devnull 	if(l->tail){
564 1544f909 2004-12-25 devnull 		l->tail->allnext = t;
565 1544f909 2004-12-25 devnull 		t->allprev = l->tail;
566 1544f909 2004-12-25 devnull 	}else{
567 1544f909 2004-12-25 devnull 		l->head = t;
568 1544f909 2004-12-25 devnull 		t->allprev = nil;
569 1544f909 2004-12-25 devnull 	}
570 1544f909 2004-12-25 devnull 	l->tail = t;
571 1544f909 2004-12-25 devnull 	t->allnext = nil;
572 1544f909 2004-12-25 devnull }
573 1544f909 2004-12-25 devnull 
574 1544f909 2004-12-25 devnull static void
575 1544f909 2004-12-25 devnull delthreadinproc(Proc *p, _Thread *t)
576 1544f909 2004-12-25 devnull {
577 1544f909 2004-12-25 devnull 	_Threadlist *l;
578 1544f909 2004-12-25 devnull 
579 1544f909 2004-12-25 devnull 	l = &p->allthreads;
580 1544f909 2004-12-25 devnull 	if(t->allprev)
581 1544f909 2004-12-25 devnull 		t->allprev->allnext = t->allnext;
582 1544f909 2004-12-25 devnull 	else
583 1544f909 2004-12-25 devnull 		l->head = t->allnext;
584 1544f909 2004-12-25 devnull 	if(t->allnext)
585 1544f909 2004-12-25 devnull 		t->allnext->allprev = t->allprev;
586 1544f909 2004-12-25 devnull 	else
587 1544f909 2004-12-25 devnull 		l->tail = t->allprev;
588 1544f909 2004-12-25 devnull }
589 1544f909 2004-12-25 devnull 
590 4dbefdd4 2004-12-27 devnull Proc *_threadprocs;
591 4dbefdd4 2004-12-27 devnull Lock _threadprocslock;
592 4dbefdd4 2004-12-27 devnull static Proc *_threadprocstail;
593 1544f909 2004-12-25 devnull 
594 1544f909 2004-12-25 devnull static void
595 4dbefdd4 2004-12-27 devnull addproc(Proc *p)
596 1544f909 2004-12-25 devnull {
597 4dbefdd4 2004-12-27 devnull 	lock(&_threadprocslock);
598 4dbefdd4 2004-12-27 devnull 	if(_threadprocstail){
599 4dbefdd4 2004-12-27 devnull 		_threadprocstail->next = p;
600 4dbefdd4 2004-12-27 devnull 		p->prev = _threadprocstail;
601 4dbefdd4 2004-12-27 devnull 	}else{
602 4dbefdd4 2004-12-27 devnull 		_threadprocs = p;
603 4dbefdd4 2004-12-27 devnull 		p->prev = nil;
604 4dbefdd4 2004-12-27 devnull 	}
605 4dbefdd4 2004-12-27 devnull 	_threadprocstail = p;
606 4dbefdd4 2004-12-27 devnull 	p->next = nil;
607 4dbefdd4 2004-12-27 devnull 	unlock(&_threadprocslock);
608 e1dc7e45 2004-12-27 devnull }
609 e1dc7e45 2004-12-27 devnull 
610 4dbefdd4 2004-12-27 devnull static void
611 4dbefdd4 2004-12-27 devnull delproc(Proc *p)
612 e1dc7e45 2004-12-27 devnull {
613 4dbefdd4 2004-12-27 devnull 	lock(&_threadprocslock);
614 4dbefdd4 2004-12-27 devnull 	if(p->prev)
615 4dbefdd4 2004-12-27 devnull 		p->prev->next = p->next;
616 4dbefdd4 2004-12-27 devnull 	else
617 4dbefdd4 2004-12-27 devnull 		_threadprocs = p->next;
618 4dbefdd4 2004-12-27 devnull 	if(p->next)
619 4dbefdd4 2004-12-27 devnull 		p->next->prev = p->prev;
620 4dbefdd4 2004-12-27 devnull 	else
621 4dbefdd4 2004-12-27 devnull 		_threadprocstail = p->prev;
622 4dbefdd4 2004-12-27 devnull 	unlock(&_threadprocslock);
623 1544f909 2004-12-25 devnull }
624 15cd8255 2005-01-04 devnull 
625 15cd8255 2005-01-04 devnull /* 
626 15cd8255 2005-01-04 devnull  * notify - for now just use the usual mechanisms
627 15cd8255 2005-01-04 devnull  */
628 15cd8255 2005-01-04 devnull void
629 15cd8255 2005-01-04 devnull threadnotify(int (*f)(void*, char*), int in)
630 15cd8255 2005-01-04 devnull {
631 15cd8255 2005-01-04 devnull 	atnotify(f, in);
632 15cd8255 2005-01-04 devnull }