6 #ifndef CLONE_PARENT /* lameass glibc 2.2 doesn't define this */
7 #define CLONE_PARENT 0x00008000 /* even though the manpage documents it */
11 #include "validate.h" /* for CONTROL_STACK_SIZE etc */
14 #include "target-arch-os.h"
17 #ifdef LISP_FEATURE_GENCGC
21 #include "genesis/cons.h"
22 #define ALIEN_STACK_SIZE (1*1024*1024) /* 1Mb size chosen at random */
24 int dynamic_values_bytes=4096*sizeof(lispobj); /* same for all threads */
25 struct thread *all_threads;
26 lispobj all_threads_lock;
28 extern struct interrupt_data * global_interrupt_data;
30 void get_spinlock(lispobj *word,int value);
32 /* this is the first thing that clone() runs in the child (which is
33 * why the silly calling convention). Basically it calls the user's
34 * requested lisp function after doing arch_os_thread_init and
35 * whatever other bookkeeping needs to be done
38 /* set go to 0 to stop the thread before it starts. Convenient if you
39 * want to attach a debugger to it before it does anything */
43 new_thread_trampoline(struct thread *th)
47 function = th->unbound_marker;
49 fprintf(stderr, "/pausing 0x%lx(%d,%d) before new_thread_trampoline(0x%lx)\n",
50 (unsigned long)th,th->pid,getpid(),(unsigned long)function);
52 fprintf(stderr, "/continue\n");
54 th->unbound_marker = UNBOUND_MARKER_WIDETAG;
55 #ifdef LISP_FEATURE_SB_THREAD
56 /* wait here until our thread is linked into all_threads: see below */
57 while(th->pid<1) sched_yield();
60 lose("th->pid not set up right");
63 if(arch_os_thread_init(th)==0)
64 return 1; /* failure. no, really */
65 #if !defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_X86)
66 return call_into_lisp_first_time(function,args,0);
68 return funcall0(function);
72 /* this is called from any other thread to create the new one, and
73 * initialize all parts of it that can be initialized from another
77 pid_t create_thread(lispobj initial_function) {
78 union per_thread_data *per_thread;
79 struct thread *th=0; /* subdue gcc */
83 /* may as well allocate all the spaces at once: it saves us from
84 * having to decide what to do if only some of the allocations
87 THREAD_CONTROL_STACK_SIZE+
93 if(!spaces) goto cleanup;
94 per_thread=(union per_thread_data *)
96 THREAD_CONTROL_STACK_SIZE+
100 th=&per_thread->thread;
102 memcpy(per_thread,arch_os_get_current_thread(),
103 dynamic_values_bytes);
105 #ifdef LISP_FEATURE_SB_THREAD
107 for(i=0;i<(dynamic_values_bytes/sizeof(lispobj));i++)
108 per_thread->dynamic_values[i]=UNBOUND_MARKER_WIDETAG;
109 if(SymbolValue(FREE_TLS_INDEX,0)==UNBOUND_MARKER_WIDETAG)
112 make_fixnum(MAX_INTERRUPTS+
113 sizeof(struct thread)/sizeof(lispobj)),
115 #define STATIC_TLS_INIT(sym,field) \
116 ((struct symbol *)(sym-OTHER_POINTER_LOWTAG))->tls_index= \
117 make_fixnum(THREAD_SLOT_OFFSET_WORDS(field))
119 STATIC_TLS_INIT(BINDING_STACK_START,binding_stack_start);
120 STATIC_TLS_INIT(BINDING_STACK_POINTER,binding_stack_pointer);
121 STATIC_TLS_INIT(CONTROL_STACK_START,control_stack_start);
122 STATIC_TLS_INIT(CONTROL_STACK_END,control_stack_end);
123 STATIC_TLS_INIT(ALIEN_STACK,alien_stack_pointer);
124 #ifdef LISP_FEATURE_X86
125 STATIC_TLS_INIT(PSEUDO_ATOMIC_ATOMIC,pseudo_atomic_atomic);
126 STATIC_TLS_INIT(PSEUDO_ATOMIC_INTERRUPTED,pseudo_atomic_interrupted);
128 #undef STATIC_TLS_INIT
132 th->control_stack_start = spaces;
133 th->binding_stack_start=
134 (lispobj*)((void*)th->control_stack_start+THREAD_CONTROL_STACK_SIZE);
135 th->control_stack_end = th->binding_stack_start;
136 th->alien_stack_start=
137 (lispobj*)((void*)th->binding_stack_start+BINDING_STACK_SIZE);
138 th->binding_stack_pointer=th->binding_stack_start;
141 #ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
142 th->alien_stack_pointer=((void *)th->alien_stack_start
143 + ALIEN_STACK_SIZE-4); /* naked 4. FIXME */
145 th->alien_stack_pointer=((void *)th->alien_stack_start);
147 #ifdef LISP_FEATURE_X86
148 th->pseudo_atomic_interrupted=0;
149 /* runtime.c used to set PSEUDO_ATOMIC_ATOMIC =1 globally. I'm not
150 * sure why, but it appears to help */
151 th->pseudo_atomic_atomic=make_fixnum(1);
153 #ifdef LISP_FEATURE_GENCGC
154 gc_set_region_empty(&th->alloc_region);
157 #ifndef LISP_FEATURE_SB_THREAD
158 /* the tls-points-into-struct-thread trick is only good for threaded
159 * sbcl, because unithread sbcl doesn't have tls. So, we copy the
160 * appropriate values from struct thread here, and make sure that
161 * we use the appropriate SymbolValue macros to access any of the
162 * variable quantities from the C runtime. It's not quite OAOOM,
163 * it just feels like it */
164 SetSymbolValue(BINDING_STACK_START,th->binding_stack_start,th);
165 SetSymbolValue(CONTROL_STACK_START,th->control_stack_start,th);
166 SetSymbolValue(CONTROL_STACK_END,th->control_stack_end,th);
167 #ifdef LISP_FEATURE_X86
168 SetSymbolValue(BINDING_STACK_POINTER,th->binding_stack_pointer,th);
169 SetSymbolValue(ALIEN_STACK,th->alien_stack_pointer,th);
170 SetSymbolValue(PSEUDO_ATOMIC_ATOMIC,th->pseudo_atomic_atomic,th);
171 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED,th->pseudo_atomic_interrupted,th);
173 current_binding_stack_pointer=th->binding_stack_pointer;
174 current_control_stack_pointer=th->control_stack_start;
177 bind_variable(CURRENT_CATCH_BLOCK,make_fixnum(0),th);
178 bind_variable(CURRENT_UNWIND_PROTECT_BLOCK,make_fixnum(0),th);
179 bind_variable(FREE_INTERRUPT_CONTEXT_INDEX,make_fixnum(0),th);
180 bind_variable(INTERRUPT_PENDING, NIL,th);
181 bind_variable(INTERRUPTS_ENABLED,T,th);
183 th->interrupt_data=os_validate(0,(sizeof (struct interrupt_data)));
185 memcpy(th->interrupt_data,
186 arch_os_get_current_thread()->interrupt_data,
187 sizeof (struct interrupt_data));
189 memcpy(th->interrupt_data,global_interrupt_data,
190 sizeof (struct interrupt_data));
192 th->unbound_marker=initial_function;
193 #ifdef LISP_FEATURE_SB_THREAD
194 #if defined(LISP_FEATURE_X86) && defined (LISP_FEATURE_LINUX)
196 clone(new_thread_trampoline,
197 (((void*)th->control_stack_start)+THREAD_CONTROL_STACK_SIZE-4),
198 (((getpid()!=parent_pid)?(CLONE_PARENT):0)
199 |CLONE_FILES|SIGALRM|CLONE_VM),th);
203 #error this stuff presently only works on x86 Linux
208 get_spinlock(&all_threads_lock,kid_pid);
209 th->next=all_threads;
211 /* note that th->pid is 0 at this time. We rely on all_threads_lock
212 * to ensure that we don't have >1 thread with pid=0 on the list at once
214 protect_control_stack_guard_page(th->pid,1);
215 release_spinlock(&all_threads_lock);
216 th->pid=kid_pid; /* child will not start until this is set */
217 #ifndef LISP_FEATURE_SB_THREAD
218 new_thread_trampoline(all_threads); /* call_into_lisp */
219 lose("Clever child? Idiot savant, verging on the.");
224 /* if(th && th->tls_cookie>=0) os_free_tls_pointer(th); */
225 if(spaces) os_invalidate(spaces,
226 THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+
227 ALIEN_STACK_SIZE+dynamic_values_bytes);
231 void destroy_thread (struct thread *th)
233 /* precondition: the unix task has already been killed and exited.
234 * This is called by the parent */
235 #ifdef LISP_FEATURE_GENCGC
236 gc_alloc_update_page_tables(0, &th->alloc_region);
238 get_spinlock(&all_threads_lock,th->pid);
239 if(countdown_to_gc>0) countdown_to_gc--;
241 all_threads=th->next;
243 struct thread *th1=all_threads;
244 while(th1->next!=th) th1=th1->next;
245 th1->next=th->next; /* unlink */
247 release_spinlock(&all_threads_lock);
248 if(th && th->tls_cookie>=0) arch_os_thread_cleanup(th);
249 os_invalidate((os_vm_address_t) th->control_stack_start,
251 * (th->control_stack_end-th->control_stack_start)) +
252 BINDING_STACK_SIZE+ALIEN_STACK_SIZE+dynamic_values_bytes+
257 struct thread *find_thread_by_pid(pid_t pid)
261 if(th->pid==pid) return th;
265 void block_sigcont(void)
267 /* don't allow ourselves to receive SIGCONT while we're in the
268 * "ambiguous" state of being on the queue but not actually stopped.
271 sigemptyset(&newset);
272 sigaddset(&newset,SIGCONT);
273 sigprocmask(SIG_BLOCK, &newset, 0);
276 /* This is not needed unless #+SB-THREAD, and since sigwaitinfo()
277 * doesn't seem to be easily available everywhere (OpenBSD...) it's
278 * more trouble than it's worth to compile it when not needed. */
279 #if defined LISP_FEATURE_SB_THREAD
280 void unblock_sigcont_and_sleep(void)
284 sigaddset(&set,SIGCONT);
286 sigprocmask(SIG_UNBLOCK,&set,0);
289 int interrupt_thread(pid_t pid, lispobj function)
292 sigval.sival_int=function;
294 return sigqueue(pid, SIG_INTERRUPT_THREAD, sigval);
297 void gc_stop_the_world()
299 /* stop all other threads by sending them SIG_STOP_FOR_GC */
300 struct thread *p,*th=arch_os_get_current_thread();
301 struct thread *tail=0;
304 get_spinlock(&all_threads_lock,th->pid);
305 if(tail!=all_threads) {
306 /* new threads always get consed onto the front of all_threads,
307 * and may be created by any thread that we haven't signalled
308 * yet or hasn't received our signal and stopped yet. So, check
309 * for them on each time around */
310 for(p=all_threads;p!=tail;p=p->next) {
313 kill(p->pid,SIG_STOP_FOR_GC);
317 finished=(countdown_to_gc==0);
319 release_spinlock(&all_threads_lock);
324 void gc_start_the_world()
326 struct thread *p,*th=arch_os_get_current_thread();
327 get_spinlock(&all_threads_lock,th->pid);
328 for(p=all_threads;p;p=p->next) {
330 kill(p->pid,SIGCONT);
332 release_spinlock(&all_threads_lock);