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;
27 extern struct interrupt_data * global_interrupt_data;
29 void get_spinlock(lispobj *word,int value);
31 /* this is the first thing that clone() runs in the child (which is
32 * why the silly calling convention). Basically it calls the user's
33 * requested lisp function after doing arch_os_thread_init and
34 * whatever other bookkeeping needs to be done
37 /* set go to 0 to stop the thread before it starts. Convenient if you
38 * want to attach a debugger to it before it does anything */
42 new_thread_trampoline(struct thread *th)
46 function = th->unbound_marker;
48 fprintf(stderr, "/pausing 0x%lx(%d,%d) before new_thread_trampoline(0x%lx)\n",
49 (unsigned long)th,th->pid,getpid(),(unsigned long)function);
51 fprintf(stderr, "/continue\n");
53 th->unbound_marker = UNBOUND_MARKER_WIDETAG;
54 #ifdef LISP_FEATURE_SB_THREAD
55 /* wait here until our thread is linked into all_threads: see below */
56 while(th->pid<1) sched_yield();
59 lose("th->pid not set up right");
62 if(arch_os_thread_init(th)==0)
63 return 1; /* failure. no, really */
64 #if !defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_X86)
65 return call_into_lisp_first_time(function,args,0);
67 return funcall0(function);
71 /* this is called from any other thread to create the new one, and
72 * initialize all parts of it that can be initialized from another
76 pid_t create_thread(lispobj initial_function) {
77 union per_thread_data *per_thread;
78 struct thread *th=0; /* subdue gcc */
82 /* may as well allocate all the spaces at once: it saves us from
83 * having to decide what to do if only some of the allocations
86 THREAD_CONTROL_STACK_SIZE+
92 if(!spaces) goto cleanup;
93 per_thread=(union per_thread_data *)
95 THREAD_CONTROL_STACK_SIZE+
99 th=&per_thread->thread;
101 memcpy(per_thread,arch_os_get_current_thread(),
102 dynamic_values_bytes);
104 #ifdef LISP_FEATURE_SB_THREAD
106 for(i=0;i<(dynamic_values_bytes/sizeof(lispobj));i++)
107 per_thread->dynamic_values[i]=UNBOUND_MARKER_WIDETAG;
108 if(SymbolValue(FREE_TLS_INDEX,0)==UNBOUND_MARKER_WIDETAG)
111 make_fixnum(MAX_INTERRUPTS+
112 sizeof(struct thread)/sizeof(lispobj)),
114 #define STATIC_TLS_INIT(sym,field) \
115 ((struct symbol *)(sym-OTHER_POINTER_LOWTAG))->tls_index= \
116 make_fixnum(THREAD_SLOT_OFFSET_WORDS(field))
118 STATIC_TLS_INIT(BINDING_STACK_START,binding_stack_start);
119 STATIC_TLS_INIT(BINDING_STACK_POINTER,binding_stack_pointer);
120 STATIC_TLS_INIT(CONTROL_STACK_START,control_stack_start);
121 STATIC_TLS_INIT(CONTROL_STACK_END,control_stack_end);
122 STATIC_TLS_INIT(ALIEN_STACK,alien_stack_pointer);
123 STATIC_TLS_INIT(PSEUDO_ATOMIC_ATOMIC,pseudo_atomic_atomic);
124 STATIC_TLS_INIT(PSEUDO_ATOMIC_INTERRUPTED,pseudo_atomic_interrupted);
125 #undef STATIC_TLS_INIT
129 th->control_stack_start = spaces;
130 th->binding_stack_start=
131 (lispobj*)((void*)th->control_stack_start+THREAD_CONTROL_STACK_SIZE);
132 th->control_stack_end = th->binding_stack_start;
133 th->alien_stack_start=
134 (lispobj*)((void*)th->binding_stack_start+BINDING_STACK_SIZE);
135 th->binding_stack_pointer=th->binding_stack_start;
138 #ifdef LISP_FEATURE_STACK_GROWS_DOWNWARD_NOT_UPWARD
139 th->alien_stack_pointer=((void *)th->alien_stack_start
140 + ALIEN_STACK_SIZE-4); /* naked 4. FIXME */
142 th->alien_stack_pointer=((void *)th->alien_stack_start);
144 th->pseudo_atomic_interrupted=0;
145 /* runtime.c used to set PSEUDO_ATOMIC_ATOMIC =1 globally. I'm not
146 * sure why, but it appears to help */
147 th->pseudo_atomic_atomic=make_fixnum(1);
148 #ifdef LISP_FEATURE_GENCGC
149 gc_set_region_empty(&th->alloc_region);
152 #ifndef LISP_FEATURE_SB_THREAD
153 /* the tls-points-into-struct-thread trick is only good for threaded
154 * sbcl, because unithread sbcl doesn't have tls. So, we copy the
155 * appropriate values from struct thread here, and make sure that
156 * we use the appropriate SymbolValue macros to access any of the
157 * variable quantities from the C runtime. It's not quite OAOOM,
158 * it just feels like it */
159 SetSymbolValue(BINDING_STACK_START,th->binding_stack_start,th);
160 SetSymbolValue(CONTROL_STACK_START,th->control_stack_start,th);
161 SetSymbolValue(CONTROL_STACK_END,th->control_stack_end,th);
162 #ifdef LISP_FEATURE_X86
163 SetSymbolValue(BINDING_STACK_POINTER,th->binding_stack_pointer,th);
164 SetSymbolValue(ALIEN_STACK,th->alien_stack_pointer,th);
165 SetSymbolValue(PSEUDO_ATOMIC_ATOMIC,th->pseudo_atomic_atomic,th);
166 SetSymbolValue(PSEUDO_ATOMIC_INTERRUPTED,th->pseudo_atomic_interrupted,th);
168 current_binding_stack_pointer=th->binding_stack_pointer;
169 current_control_stack_pointer=th->control_stack_start;
172 bind_variable(CURRENT_CATCH_BLOCK,make_fixnum(0),th);
173 bind_variable(CURRENT_UNWIND_PROTECT_BLOCK,make_fixnum(0),th);
174 bind_variable(FREE_INTERRUPT_CONTEXT_INDEX,make_fixnum(0),th);
175 bind_variable(INTERRUPT_PENDING, NIL,th);
176 bind_variable(INTERRUPTS_ENABLED,T,th);
178 th->interrupt_data=malloc(sizeof (struct interrupt_data));
180 memcpy(th->interrupt_data,
181 arch_os_get_current_thread()->interrupt_data,
182 sizeof (struct interrupt_data));
184 memcpy(th->interrupt_data,global_interrupt_data,
185 sizeof (struct interrupt_data));
187 th->unbound_marker=initial_function;
188 #ifdef LISP_FEATURE_SB_THREAD
189 #if defined(LISP_FEATURE_X86) && defined (LISP_FEATURE_LINUX)
191 clone(new_thread_trampoline,
192 (((void*)th->control_stack_start)+THREAD_CONTROL_STACK_SIZE-4),
193 (((getpid()!=parent_pid)?(CLONE_PARENT):0)
194 |CLONE_FILES|SIGALRM|CLONE_VM),th);
198 #error this stuff presently only works on x86 Linux
203 get_spinlock(&all_threads_lock,kid_pid);
204 th->next=all_threads;
206 /* note that th->pid is 0 at this time. We rely on all_threads_lock
207 * to ensure that we don't have >1 thread with pid=0 on the list at once
209 protect_control_stack_guard_page(th->pid,1);
211 th->pid=kid_pid; /* child will not start until this is set */
212 #ifndef LISP_FEATURE_SB_THREAD
213 new_thread_trampoline(all_threads); /* call_into_lisp */
214 lose("Clever child? Idiot savant, verging on the.");
219 /* if(th && th->tls_cookie>=0) os_free_tls_pointer(th); */
220 if(spaces) os_invalidate(spaces,
221 THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+
222 ALIEN_STACK_SIZE+dynamic_values_bytes);
226 void destroy_thread (struct thread *th)
228 /* precondition: the unix task has already been killed and exited.
229 * This is called by the parent */
230 #ifdef LISP_FEATURE_GENCGC
231 gc_alloc_update_page_tables(0, &th->alloc_region);
233 get_spinlock(&all_threads_lock,th->pid);
235 all_threads=th->next;
237 struct thread *th1=all_threads;
238 while(th1->next!=th) th1=th1->next;
239 th1->next=th->next; /* unlink */
242 if(th && th->tls_cookie>=0) arch_os_thread_cleanup(th);
243 os_invalidate((os_vm_address_t) th->control_stack_start,
244 THREAD_CONTROL_STACK_SIZE+BINDING_STACK_SIZE+
245 ALIEN_STACK_SIZE+dynamic_values_bytes+
250 struct thread *find_thread_by_pid(pid_t pid)
254 if(th->pid==pid) return th;
258 void block_sigcont(void)
260 /* don't allow ourselves to receive SIGCONT while we're in the
261 * "ambiguous" state of being on the queue but not actually stopped.
264 sigemptyset(&newset);
265 sigaddset(&newset,SIGCONT);
266 sigprocmask(SIG_BLOCK, &newset, 0);
269 void unblock_sigcont_and_sleep(void)
273 sigaddset(&set,SIGCONT);
275 sigprocmask(SIG_UNBLOCK,&set,0);