1 31cf0ab1 2004-12-28 devnull #include "threadimpl.h"
  2 31cf0ab1 2004-12-28 devnull 
  3 31cf0ab1 2004-12-28 devnull extern int __isthreaded;
  4 31cf0ab1 2004-12-28 devnull 
  5 31cf0ab1 2004-12-28 devnull /*
  6 31cf0ab1 2004-12-28 devnull  * spin locks
  7 31cf0ab1 2004-12-28 devnull  */
  8 31cf0ab1 2004-12-28 devnull extern int _tas(int*);
  9 31cf0ab1 2004-12-28 devnull 
 10 31cf0ab1 2004-12-28 devnull void
 11 31cf0ab1 2004-12-28 devnull _threadunlock(Lock *l, ulong pc)
 12 31cf0ab1 2004-12-28 devnull {
 13 31cf0ab1 2004-12-28 devnull 	USED(pc);
 14 31cf0ab1 2004-12-28 devnull 
 15 31cf0ab1 2004-12-28 devnull 	l->held = 0;
 16 31cf0ab1 2004-12-28 devnull }
 17 31cf0ab1 2004-12-28 devnull 
 18 31cf0ab1 2004-12-28 devnull int
 19 31cf0ab1 2004-12-28 devnull _threadlock(Lock *l, int block, ulong pc)
 20 31cf0ab1 2004-12-28 devnull {
 21 31cf0ab1 2004-12-28 devnull 	int i;
 22 31cf0ab1 2004-12-28 devnull 
 23 31cf0ab1 2004-12-28 devnull 	USED(pc);
 24 31cf0ab1 2004-12-28 devnull 
 25 31cf0ab1 2004-12-28 devnull 	/* once fast */
 26 31cf0ab1 2004-12-28 devnull 	if(!_tas(&l->held))
 27 31cf0ab1 2004-12-28 devnull 		return 1;
 28 31cf0ab1 2004-12-28 devnull 	if(!block)
 29 31cf0ab1 2004-12-28 devnull 		return 0;
 30 31cf0ab1 2004-12-28 devnull 
 31 31cf0ab1 2004-12-28 devnull 	/* a thousand times pretty fast */
 32 31cf0ab1 2004-12-28 devnull 	for(i=0; i<1000; i++){
 33 31cf0ab1 2004-12-28 devnull 		if(!_tas(&l->held))
 34 31cf0ab1 2004-12-28 devnull 			return 1;
 35 31cf0ab1 2004-12-28 devnull 		sched_yield();
 36 31cf0ab1 2004-12-28 devnull 	}
 37 31cf0ab1 2004-12-28 devnull 	/* now nice and slow */
 38 31cf0ab1 2004-12-28 devnull 	for(i=0; i<1000; i++){
 39 31cf0ab1 2004-12-28 devnull 		if(!_tas(&l->held))
 40 31cf0ab1 2004-12-28 devnull 			return 1;
 41 31cf0ab1 2004-12-28 devnull 		usleep(100*1000);
 42 31cf0ab1 2004-12-28 devnull 	}
 43 31cf0ab1 2004-12-28 devnull 	/* take your time */
 44 31cf0ab1 2004-12-28 devnull 	while(_tas(&l->held))
 45 31cf0ab1 2004-12-28 devnull 		usleep(1000*1000);
 46 31cf0ab1 2004-12-28 devnull 	return 1;
 47 31cf0ab1 2004-12-28 devnull }
 48 31cf0ab1 2004-12-28 devnull 
 49 31cf0ab1 2004-12-28 devnull /*
 50 31cf0ab1 2004-12-28 devnull  * For FreeBSD libc.
 51 31cf0ab1 2004-12-28 devnull  */
 52 31cf0ab1 2004-12-28 devnull 
 53 31cf0ab1 2004-12-28 devnull typedef struct {
 54 31cf0ab1 2004-12-28 devnull 	volatile long	access_lock;
 55 31cf0ab1 2004-12-28 devnull 	volatile long	lock_owner;
 56 31cf0ab1 2004-12-28 devnull 	volatile char	*fname;
 57 31cf0ab1 2004-12-28 devnull 	volatile int	lineno;
 58 31cf0ab1 2004-12-28 devnull } spinlock_t;
 59 31cf0ab1 2004-12-28 devnull 
 60 31cf0ab1 2004-12-28 devnull void
 61 31cf0ab1 2004-12-28 devnull _spinlock(spinlock_t *lk)
 62 31cf0ab1 2004-12-28 devnull {
 63 31cf0ab1 2004-12-28 devnull 	lock((Lock*)&lk->access_lock);
 64 31cf0ab1 2004-12-28 devnull }
 65 31cf0ab1 2004-12-28 devnull 
 66 31cf0ab1 2004-12-28 devnull /*
 67 31cf0ab1 2004-12-28 devnull  * sleep and wakeup
 68 31cf0ab1 2004-12-28 devnull  */
 69 31cf0ab1 2004-12-28 devnull static void
 70 31cf0ab1 2004-12-28 devnull ign(int x)
 71 31cf0ab1 2004-12-28 devnull {
 72 31cf0ab1 2004-12-28 devnull 	USED(x);
 73 31cf0ab1 2004-12-28 devnull }
 74 31cf0ab1 2004-12-28 devnull 
 75 31cf0ab1 2004-12-28 devnull static void /*__attribute__((constructor))*/
 76 31cf0ab1 2004-12-28 devnull ignusr1(int restart)
 77 31cf0ab1 2004-12-28 devnull {
 78 31cf0ab1 2004-12-28 devnull 	struct sigaction sa;
 79 31cf0ab1 2004-12-28 devnull 
 80 31cf0ab1 2004-12-28 devnull 	memset(&sa, 0, sizeof sa);
 81 31cf0ab1 2004-12-28 devnull 	sa.sa_handler = ign;
 82 31cf0ab1 2004-12-28 devnull 	sigemptyset(&sa.sa_mask);
 83 31cf0ab1 2004-12-28 devnull 	sigaddset(&sa.sa_mask, SIGUSR1);
 84 31cf0ab1 2004-12-28 devnull 	if(restart)
 85 31cf0ab1 2004-12-28 devnull 		sa.sa_flags = SA_RESTART;
 86 31cf0ab1 2004-12-28 devnull 	sigaction(SIGUSR1, &sa, nil);
 87 31cf0ab1 2004-12-28 devnull }
 88 31cf0ab1 2004-12-28 devnull 
 89 31cf0ab1 2004-12-28 devnull void
 90 31cf0ab1 2004-12-28 devnull _procsleep(_Procrendez *r)
 91 31cf0ab1 2004-12-28 devnull {
 92 31cf0ab1 2004-12-28 devnull 	sigset_t mask;
 93 31cf0ab1 2004-12-28 devnull 
 94 31cf0ab1 2004-12-28 devnull 	/*
 95 31cf0ab1 2004-12-28 devnull 	 * Go to sleep.
 96 31cf0ab1 2004-12-28 devnull 	 *
 97 31cf0ab1 2004-12-28 devnull 	 * Block USR1, set the handler to interrupt system calls,
 98 31cf0ab1 2004-12-28 devnull 	 * unlock the vouslock so our waker can wake us,
 99 31cf0ab1 2004-12-28 devnull 	 * and then suspend.
100 31cf0ab1 2004-12-28 devnull 	 */
101 31cf0ab1 2004-12-28 devnull again:
102 31cf0ab1 2004-12-28 devnull 	r->asleep = 1;
103 31cf0ab1 2004-12-28 devnull 	r->pid = getpid();
104 31cf0ab1 2004-12-28 devnull 
105 31cf0ab1 2004-12-28 devnull 	sigprocmask(SIG_SETMASK, nil, &mask);
106 31cf0ab1 2004-12-28 devnull 	sigaddset(&mask, SIGUSR1);
107 31cf0ab1 2004-12-28 devnull 	sigprocmask(SIG_SETMASK, &mask, nil);
108 31cf0ab1 2004-12-28 devnull 	ignusr1(0);
109 31cf0ab1 2004-12-28 devnull 	unlock(r->l);
110 31cf0ab1 2004-12-28 devnull 	sigdelset(&mask, SIGUSR1);
111 31cf0ab1 2004-12-28 devnull 	sigsuspend(&mask);
112 31cf0ab1 2004-12-28 devnull 
113 31cf0ab1 2004-12-28 devnull 	/*
114 31cf0ab1 2004-12-28 devnull 	 * We're awake.  Make USR1 not interrupt system calls.
115 31cf0ab1 2004-12-28 devnull 	 */
116 31cf0ab1 2004-12-28 devnull 	lock(r->l);
117 31cf0ab1 2004-12-28 devnull 	ignusr1(1);
118 31cf0ab1 2004-12-28 devnull 	if(r->asleep && r->pid == getpid()){
119 31cf0ab1 2004-12-28 devnull 		/* Didn't really wake up - signal from something else */
120 31cf0ab1 2004-12-28 devnull 		goto again;
121 31cf0ab1 2004-12-28 devnull 	}
122 31cf0ab1 2004-12-28 devnull }
123 31cf0ab1 2004-12-28 devnull 
124 31cf0ab1 2004-12-28 devnull void
125 31cf0ab1 2004-12-28 devnull _procwakeup(_Procrendez *r)
126 31cf0ab1 2004-12-28 devnull {
127 31cf0ab1 2004-12-28 devnull 	if(r->asleep){
128 31cf0ab1 2004-12-28 devnull 		r->asleep = 0;
129 31cf0ab1 2004-12-28 devnull 		assert(r->pid >= 1);
130 31cf0ab1 2004-12-28 devnull 		kill(r->pid, SIGUSR1);
131 31cf0ab1 2004-12-28 devnull 	}
132 31cf0ab1 2004-12-28 devnull }
133 31cf0ab1 2004-12-28 devnull 
134 31cf0ab1 2004-12-28 devnull /*
135 31cf0ab1 2004-12-28 devnull  * process creation and exit
136 31cf0ab1 2004-12-28 devnull  */
137 31cf0ab1 2004-12-28 devnull typedef struct Stackfree Stackfree;
138 31cf0ab1 2004-12-28 devnull struct Stackfree
139 31cf0ab1 2004-12-28 devnull {
140 31cf0ab1 2004-12-28 devnull 	Stackfree	*next;
141 31cf0ab1 2004-12-28 devnull 	int	pid;
142 31cf0ab1 2004-12-28 devnull };
143 31cf0ab1 2004-12-28 devnull static Lock stacklock;
144 31cf0ab1 2004-12-28 devnull static Stackfree *stackfree;
145 31cf0ab1 2004-12-28 devnull 
146 31cf0ab1 2004-12-28 devnull static void
147 31cf0ab1 2004-12-28 devnull delayfreestack(uchar *stk)
148 31cf0ab1 2004-12-28 devnull {
149 31cf0ab1 2004-12-28 devnull 	Stackfree *sf;
150 31cf0ab1 2004-12-28 devnull 
151 31cf0ab1 2004-12-28 devnull 	sf = (Stackfree*)stk;
152 31cf0ab1 2004-12-28 devnull 	sf->pid = getpid();
153 31cf0ab1 2004-12-28 devnull 	lock(&stacklock);
154 31cf0ab1 2004-12-28 devnull 	sf->next = stackfree;
155 31cf0ab1 2004-12-28 devnull 	stackfree = sf;
156 31cf0ab1 2004-12-28 devnull 	unlock(&stacklock);
157 31cf0ab1 2004-12-28 devnull }
158 31cf0ab1 2004-12-28 devnull 
159 31cf0ab1 2004-12-28 devnull static void
160 31cf0ab1 2004-12-28 devnull dofreestacks(void)
161 31cf0ab1 2004-12-28 devnull {
162 31cf0ab1 2004-12-28 devnull 	Stackfree *sf, *last, *next;
163 31cf0ab1 2004-12-28 devnull 
164 31cf0ab1 2004-12-28 devnull 	if(stackfree==nil || !canlock(&stacklock))
165 31cf0ab1 2004-12-28 devnull 		return;
166 31cf0ab1 2004-12-28 devnull 
167 31cf0ab1 2004-12-28 devnull 	for(last=nil,sf=stackfree; sf; last=sf,sf=next){
168 31cf0ab1 2004-12-28 devnull 		next = sf->next;
169 31cf0ab1 2004-12-28 devnull 		if(sf->pid >= 1 && kill(sf->pid, 0) < 0 && errno == ESRCH){
170 31cf0ab1 2004-12-28 devnull 			free(sf);
171 31cf0ab1 2004-12-28 devnull 			if(last)
172 31cf0ab1 2004-12-28 devnull 				last->next = next;
173 31cf0ab1 2004-12-28 devnull 			else
174 31cf0ab1 2004-12-28 devnull 				stackfree = next;
175 31cf0ab1 2004-12-28 devnull 			sf = last;
176 31cf0ab1 2004-12-28 devnull 		}
177 31cf0ab1 2004-12-28 devnull 	}
178 31cf0ab1 2004-12-28 devnull 	unlock(&stacklock);
179 31cf0ab1 2004-12-28 devnull }
180 31cf0ab1 2004-12-28 devnull 
181 31cf0ab1 2004-12-28 devnull static int
182 31cf0ab1 2004-12-28 devnull startprocfn(void *v)
183 31cf0ab1 2004-12-28 devnull {
184 31cf0ab1 2004-12-28 devnull 	void **a;
185 31cf0ab1 2004-12-28 devnull 	uchar *stk;
186 31cf0ab1 2004-12-28 devnull 	void (*fn)(void*);
187 31cf0ab1 2004-12-28 devnull 	Proc *p;
188 31cf0ab1 2004-12-28 devnull 
189 31cf0ab1 2004-12-28 devnull 	a = (void**)v;
190 31cf0ab1 2004-12-28 devnull 	fn = a[0];
191 31cf0ab1 2004-12-28 devnull 	p = a[1];
192 31cf0ab1 2004-12-28 devnull 	stk = a[2];
193 31cf0ab1 2004-12-28 devnull 	free(a);
194 31cf0ab1 2004-12-28 devnull 	p->osprocid = getpid();
195 31cf0ab1 2004-12-28 devnull 
196 31cf0ab1 2004-12-28 devnull 	(*fn)(p);
197 31cf0ab1 2004-12-28 devnull 
198 31cf0ab1 2004-12-28 devnull 	delayfreestack(stk);
199 31cf0ab1 2004-12-28 devnull 	_exit(0);
200 31cf0ab1 2004-12-28 devnull 	return 0;
201 31cf0ab1 2004-12-28 devnull }
202 31cf0ab1 2004-12-28 devnull 
203 31cf0ab1 2004-12-28 devnull void
204 31cf0ab1 2004-12-28 devnull _procstart(Proc *p, void (*fn)(Proc*))
205 31cf0ab1 2004-12-28 devnull {
206 31cf0ab1 2004-12-28 devnull 	void **a;
207 31cf0ab1 2004-12-28 devnull 	uchar *stk;
208 31cf0ab1 2004-12-28 devnull 	int pid;
209 31cf0ab1 2004-12-28 devnull 
210 31cf0ab1 2004-12-28 devnull 	dofreestacks();
211 31cf0ab1 2004-12-28 devnull 	a = malloc(3*sizeof a[0]);
212 31cf0ab1 2004-12-28 devnull 	if(a == nil)
213 31cf0ab1 2004-12-28 devnull 		sysfatal("_procstart malloc: %r");
214 31cf0ab1 2004-12-28 devnull 	stk = malloc(65536);
215 31cf0ab1 2004-12-28 devnull 	if(stk == nil)
216 31cf0ab1 2004-12-28 devnull 		sysfatal("_procstart malloc stack: %r");
217 31cf0ab1 2004-12-28 devnull 
218 31cf0ab1 2004-12-28 devnull 	a[0] = fn;
219 31cf0ab1 2004-12-28 devnull 	a[1] = p;
220 31cf0ab1 2004-12-28 devnull 	a[2] = stk;
221 31cf0ab1 2004-12-28 devnull 
222 31cf0ab1 2004-12-28 devnull 	pid = rfork_thread(RFPROC|RFMEM|RFNOWAIT, stk+65536-64, startprocfn, a);
223 31cf0ab1 2004-12-28 devnull 	if(pid < 0){
224 31cf0ab1 2004-12-28 devnull 		fprint(2, "_procstart rfork_thread: %r\n");
225 31cf0ab1 2004-12-28 devnull 		abort();
226 31cf0ab1 2004-12-28 devnull 	}
227 31cf0ab1 2004-12-28 devnull }
228 31cf0ab1 2004-12-28 devnull 
229 31cf0ab1 2004-12-28 devnull static char *threadexitsmsg;
230 31cf0ab1 2004-12-28 devnull void
231 31cf0ab1 2004-12-28 devnull sigusr2handler(int s)
232 31cf0ab1 2004-12-28 devnull {
233 31cf0ab1 2004-12-28 devnull /*	fprint(2, "%d usr2 %d\n", time(0), getpid()); */
234 31cf0ab1 2004-12-28 devnull 	if(threadexitsmsg)
235 31cf0ab1 2004-12-28 devnull 		_exits(threadexitsmsg);
236 31cf0ab1 2004-12-28 devnull }
237 31cf0ab1 2004-12-28 devnull 
238 31cf0ab1 2004-12-28 devnull void
239 31cf0ab1 2004-12-28 devnull threadexitsall(char *msg)
240 31cf0ab1 2004-12-28 devnull {
241 31cf0ab1 2004-12-28 devnull 	static int pid[1024];
242 31cf0ab1 2004-12-28 devnull 	int i, npid, mypid;
243 31cf0ab1 2004-12-28 devnull 	Proc *p;
244 31cf0ab1 2004-12-28 devnull 
245 31cf0ab1 2004-12-28 devnull 	if(msg == nil)
246 31cf0ab1 2004-12-28 devnull 		msg = "";
247 31cf0ab1 2004-12-28 devnull 	mypid = getpid();
248 31cf0ab1 2004-12-28 devnull 	lock(&_threadprocslock);
249 31cf0ab1 2004-12-28 devnull 	threadexitsmsg = msg;
250 31cf0ab1 2004-12-28 devnull 	npid = 0;
251 31cf0ab1 2004-12-28 devnull 	for(p=_threadprocs; p; p=p->next)
252 31cf0ab1 2004-12-28 devnull 		if(p->osprocid != mypid && p->osprocid >= 1)
253 31cf0ab1 2004-12-28 devnull 			pid[npid++] = p->osprocid;
254 31cf0ab1 2004-12-28 devnull 	for(i=0; i<npid; i++)
255 31cf0ab1 2004-12-28 devnull 		kill(pid[i], SIGUSR2);
256 31cf0ab1 2004-12-28 devnull 	unlock(&_threadprocslock);
257 31cf0ab1 2004-12-28 devnull 	exits(msg);
258 31cf0ab1 2004-12-28 devnull }
259 31cf0ab1 2004-12-28 devnull 
260 31cf0ab1 2004-12-28 devnull /*
261 31cf0ab1 2004-12-28 devnull  * per-process data, indexed by pid
262 31cf0ab1 2004-12-28 devnull  *
263 31cf0ab1 2004-12-28 devnull  * could use modify_ldt and a segment register
264 31cf0ab1 2004-12-28 devnull  * to avoid the many calls to getpid(), but i don't
265 31cf0ab1 2004-12-28 devnull  * care -- this is compatibility code.  linux 2.6 with
266 31cf0ab1 2004-12-28 devnull  * nptl is a good enough pthreads to avoid this whole file.
267 31cf0ab1 2004-12-28 devnull  */
268 31cf0ab1 2004-12-28 devnull typedef struct Perproc Perproc;
269 31cf0ab1 2004-12-28 devnull struct Perproc
270 31cf0ab1 2004-12-28 devnull {
271 31cf0ab1 2004-12-28 devnull 	int		pid;
272 31cf0ab1 2004-12-28 devnull 	Proc	*proc;
273 31cf0ab1 2004-12-28 devnull };
274 31cf0ab1 2004-12-28 devnull 
275 31cf0ab1 2004-12-28 devnull static Lock perlock;
276 31cf0ab1 2004-12-28 devnull static Perproc perproc[1024];
277 31cf0ab1 2004-12-28 devnull #define P ((Proc*)-1)
278 31cf0ab1 2004-12-28 devnull 
279 31cf0ab1 2004-12-28 devnull static Perproc*
280 31cf0ab1 2004-12-28 devnull myperproc(void)
281 31cf0ab1 2004-12-28 devnull {
282 31cf0ab1 2004-12-28 devnull 	int i, pid, h;
283 31cf0ab1 2004-12-28 devnull 	Perproc *p;
284 31cf0ab1 2004-12-28 devnull 
285 31cf0ab1 2004-12-28 devnull 	pid = getpid();
286 31cf0ab1 2004-12-28 devnull 	h = pid%nelem(perproc);
287 31cf0ab1 2004-12-28 devnull 	for(i=0; i<nelem(perproc); i++){
288 31cf0ab1 2004-12-28 devnull 		p = &perproc[(i+h)%nelem(perproc)];
289 31cf0ab1 2004-12-28 devnull 		if(p->pid == pid)
290 31cf0ab1 2004-12-28 devnull 			return p;
291 31cf0ab1 2004-12-28 devnull 		if(p->pid == 0){
292 31cf0ab1 2004-12-28 devnull 			print("found 0 at %d (h=%d)\n", (i+h)%nelem(perproc), h);
293 31cf0ab1 2004-12-28 devnull 			break;
294 31cf0ab1 2004-12-28 devnull 		}
295 31cf0ab1 2004-12-28 devnull 	}
296 31cf0ab1 2004-12-28 devnull 	fprint(2, "myperproc %d: cannot find self\n", pid);
297 31cf0ab1 2004-12-28 devnull 	abort();
298 31cf0ab1 2004-12-28 devnull 	return nil;
299 31cf0ab1 2004-12-28 devnull }
300 31cf0ab1 2004-12-28 devnull 
301 31cf0ab1 2004-12-28 devnull static Perproc*
302 31cf0ab1 2004-12-28 devnull newperproc(void)
303 31cf0ab1 2004-12-28 devnull {
304 31cf0ab1 2004-12-28 devnull 	int i, pid, h;
305 31cf0ab1 2004-12-28 devnull 	Perproc *p;
306 31cf0ab1 2004-12-28 devnull 
307 31cf0ab1 2004-12-28 devnull 	lock(&perlock);
308 31cf0ab1 2004-12-28 devnull 	pid = getpid();
309 31cf0ab1 2004-12-28 devnull 	h = pid%nelem(perproc);
310 31cf0ab1 2004-12-28 devnull 	for(i=0; i<nelem(perproc); i++){
311 31cf0ab1 2004-12-28 devnull 		p = &perproc[(i+h)%nelem(perproc)];
312 31cf0ab1 2004-12-28 devnull 		if(p->pid == pid || p->pid == -1 || p->pid == 0){
313 31cf0ab1 2004-12-28 devnull 			p->pid = pid;
314 31cf0ab1 2004-12-28 devnull 			unlock(&perlock);
315 31cf0ab1 2004-12-28 devnull 			return p;
316 31cf0ab1 2004-12-28 devnull 		}
317 31cf0ab1 2004-12-28 devnull 	}
318 31cf0ab1 2004-12-28 devnull 	fprint(2, "newperproc %d: out of procs\n", pid);
319 31cf0ab1 2004-12-28 devnull 	abort();
320 31cf0ab1 2004-12-28 devnull 	return nil;
321 31cf0ab1 2004-12-28 devnull }
322 31cf0ab1 2004-12-28 devnull 
323 31cf0ab1 2004-12-28 devnull Proc*
324 31cf0ab1 2004-12-28 devnull _threadproc(void)
325 31cf0ab1 2004-12-28 devnull {
326 31cf0ab1 2004-12-28 devnull 	return myperproc()->proc;
327 31cf0ab1 2004-12-28 devnull }
328 31cf0ab1 2004-12-28 devnull 
329 31cf0ab1 2004-12-28 devnull void
330 31cf0ab1 2004-12-28 devnull _threadsetproc(Proc *p)
331 31cf0ab1 2004-12-28 devnull {
332 31cf0ab1 2004-12-28 devnull 	Perproc *pp;
333 31cf0ab1 2004-12-28 devnull 
334 31cf0ab1 2004-12-28 devnull 	if(p)
335 31cf0ab1 2004-12-28 devnull 		p->osprocid = getpid();
336 31cf0ab1 2004-12-28 devnull 	pp = newperproc();
337 31cf0ab1 2004-12-28 devnull 	pp->proc = p;
338 31cf0ab1 2004-12-28 devnull 	if(p == nil)
339 31cf0ab1 2004-12-28 devnull 		pp->pid = -1;
340 31cf0ab1 2004-12-28 devnull }
341 31cf0ab1 2004-12-28 devnull 
342 31cf0ab1 2004-12-28 devnull void
343 31cf0ab1 2004-12-28 devnull _pthreadinit(void)
344 31cf0ab1 2004-12-28 devnull {
345 d54ead7f 2004-12-28 devnull 	__isthreaded = 1;
346 31cf0ab1 2004-12-28 devnull 	signal(SIGUSR2, sigusr2handler);
347 31cf0ab1 2004-12-28 devnull }
348 d54ead7f 2004-12-28 devnull 
349 1d2533d0 2004-12-28 devnull void
350 1d2533d0 2004-12-28 devnull _threadpexit(void)
351 1d2533d0 2004-12-28 devnull {
352 1d2533d0 2004-12-28 devnull 	_exit(0);
353 1d2533d0 2004-12-28 devnull }
354 1d2533d0 2004-12-28 devnull 
355 1d2533d0 2004-12-28 devnull 
356 d54ead7f 2004-12-28 devnull /*
357 d54ead7f 2004-12-28 devnull  * FreeBSD 4 and earlier needs the context functions.
358 d54ead7f 2004-12-28 devnull  */
359 d54ead7f 2004-12-28 devnull void
360 d54ead7f 2004-12-28 devnull makecontext(ucontext_t *ucp, void (*func)(void), int argc, ...)
361 d54ead7f 2004-12-28 devnull {
362 d54ead7f 2004-12-28 devnull 	int *sp;
363 31cf0ab1 2004-12-28 devnull 
364 d54ead7f 2004-12-28 devnull 	sp = (int*)ucp->uc_stack.ss_sp+ucp->uc_stack.ss_size/4;
365 d54ead7f 2004-12-28 devnull 	sp -= argc;
366 d54ead7f 2004-12-28 devnull 	memmove(sp, &argc+1, argc*sizeof(int));
367 d54ead7f 2004-12-28 devnull 	*--sp = 0;		/* return address */
368 d54ead7f 2004-12-28 devnull 	ucp->uc_mcontext.mc_eip = (long)func;
369 d54ead7f 2004-12-28 devnull 	ucp->uc_mcontext.mc_esp = (int)sp;
370 d54ead7f 2004-12-28 devnull }
371 d54ead7f 2004-12-28 devnull 
372 d54ead7f 2004-12-28 devnull extern int getmcontext(mcontext_t*);
373 d54ead7f 2004-12-28 devnull extern int setmcontext(mcontext_t*);
374 d54ead7f 2004-12-28 devnull 
375 d54ead7f 2004-12-28 devnull int
376 d54ead7f 2004-12-28 devnull getcontext(ucontext_t *uc)
377 d54ead7f 2004-12-28 devnull {
378 d54ead7f 2004-12-28 devnull 	return getmcontext(&uc->uc_mcontext);
379 d54ead7f 2004-12-28 devnull }
380 d54ead7f 2004-12-28 devnull 
381 d54ead7f 2004-12-28 devnull void
382 d54ead7f 2004-12-28 devnull setcontext(ucontext_t *uc)
383 d54ead7f 2004-12-28 devnull {
384 d54ead7f 2004-12-28 devnull 	setmcontext(&uc->uc_mcontext);
385 d54ead7f 2004-12-28 devnull }
386 d54ead7f 2004-12-28 devnull 
387 d54ead7f 2004-12-28 devnull int
388 d54ead7f 2004-12-28 devnull swapcontext(ucontext_t *oucp, ucontext_t *ucp)
389 d54ead7f 2004-12-28 devnull {
390 d54ead7f 2004-12-28 devnull 	if(getcontext(oucp) == 0)
391 d54ead7f 2004-12-28 devnull 		setcontext(ucp);
392 d54ead7f 2004-12-28 devnull 	return 0;
393 d54ead7f 2004-12-28 devnull }
394 d54ead7f 2004-12-28 devnull