thread.h

   1 #if !defined(_INCLUDE_THREAD_H_)
   2 #define _INCLUDE_THREAD_H_
   3
   4 #include <sys/types.h>
   5 #include <unistd.h>
   6 #include <stddef.h>
   7 #include "sbcl.h"
   8 #include "globals.h"
   9 #include "runtime.h"
  10 #include "os.h"
  11 #ifdef LISP_FEATURE_GENCGC
  12 #include "gencgc-alloc-region.h"
  13 #endif
  14 #ifdef LISP_FEATURE_WIN32
  15 #include "win32-thread-private-events.h"
  16 #endif
  17 #include "genesis/symbol.h"
  18 #include "genesis/static-symbols.h"
  19
  20 #include "genesis/thread.h"
  21 #include "genesis/fdefn.h"
  22 #include "interrupt.h"
  23 #include "validate.h"           /* for BINDING_STACK_SIZE etc */
  24
  25 #define STATE_RUNNING MAKE_FIXNUM(1)
  26 #define STATE_STOPPED MAKE_FIXNUM(2)
  27 #define STATE_DEAD MAKE_FIXNUM(3)
  28 #if defined(LISP_FEATURE_SB_SAFEPOINT)
  29 # define STATE_SUSPENDED_BRIEFLY MAKE_FIXNUM(4)
  30 # define STATE_GC_BLOCKER MAKE_FIXNUM(5)
  31 # define STATE_PHASE1_BLOCKER MAKE_FIXNUM(5)
  32 # define STATE_PHASE2_BLOCKER MAKE_FIXNUM(6)
  33 # define STATE_INTERRUPT_BLOCKER MAKE_FIXNUM(7)
  34 #endif
  35
  36 #ifdef LISP_FEATURE_SB_THREAD
  37 lispobj thread_state(struct thread *thread);
  38 void set_thread_state(struct thread *thread, lispobj state);
  39 void wait_for_thread_state_change(struct thread *thread, lispobj state);
  40
  41 #if defined(LISP_FEATURE_SB_SAFEPOINT)
  42 enum threads_suspend_reason {
  43     SUSPEND_REASON_NONE,
  44     SUSPEND_REASON_GC,
  45     SUSPEND_REASON_INTERRUPT,
  46     SUSPEND_REASON_GCING
  47 };
  48
  49 struct threads_suspend_info {
  50     int suspend;
  51     pthread_mutex_t world_lock;
  52     pthread_mutex_t lock;
  53     enum threads_suspend_reason reason;
  54     int phase;
  55     struct thread * gc_thread;
  56     struct thread * interrupted_thread;
  57     int blockers;
  58     int used_gc_page;
  59 };
  60
  61 struct suspend_phase {
  62     int suspend;
  63     enum threads_suspend_reason reason;
  64     int phase;
  65     struct suspend_phase *next;
  66 };
  67
  68 extern struct threads_suspend_info suspend_info;
  69
  70 struct gcing_safety {
  71     lispobj csp_around_foreign_call;
  72 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
  73     lispobj* pc_around_foreign_call;
  74 #endif
  75 };
  76
  77 int handle_safepoint_violation(os_context_t *context, os_vm_address_t addr);
  78 void** os_get_csp(struct thread* th);
  79 void alloc_gc_page();
  80 void assert_on_stack(struct thread *th, void *esp);
  81 #endif /* defined(LISP_FEATURE_SB_SAFEPOINT) */
  82
  83 extern pthread_key_t lisp_thread;
  84 #endif
  85
  86 extern int kill_safely(os_thread_t os_thread, int signal);
  87
  88 #define THREAD_SLOT_OFFSET_WORDS(c) \
  89  (offsetof(struct thread,c)/(sizeof (struct thread *)))
  90
  91 union per_thread_data {
  92     struct thread thread;
  93     lispobj dynamic_values[1];  /* actually more like 4000 or so */
  94 };
  95
  96 /* A helper structure for data local to a thread, which is not pointer-sized.
  97  *
  98  * Originally, all layouting of these fields was done manually in C code
  99  * with pointer arithmetic.  We let the C compiler figure it out now.
 100  *
 101  * (Why is this not part of `struct thread'?  Because that structure is
 102  * declared using genesis, and we would run into issues with fields that
 103  * are of unknown length.)
 104  */
 105 struct nonpointer_thread_data
 106 {
 107 #if defined(LISP_FEATURE_SB_THREAD) && !defined(LISP_FEATURE_SB_SAFEPOINT)
 108     os_sem_t state_sem;
 109     os_sem_t state_not_running_sem;
 110     os_sem_t state_not_stopped_sem;
 111 #else
 112     /* An unused field follows, to ensure that the struct is non-empty
 113      * for non-GCC compilers. */
 114     int unused;
 115 #endif
 116 };
 117
 118 extern struct thread *all_threads;
 119 extern int dynamic_values_bytes;
 120
 121 #if defined(LISP_FEATURE_DARWIN)
 122 #define CONTROL_STACK_ALIGNMENT_BYTES 8192 /* darwin wants page-aligned stacks */
 123 #define THREAD_ALIGNMENT_BYTES CONTROL_STACK_ALIGNMENT_BYTES
 124 #else
 125 #define THREAD_ALIGNMENT_BYTES BACKEND_PAGE_BYTES
 126 #define CONTROL_STACK_ALIGNMENT_BYTES 16
 127 #endif
 128
 129
 130 #ifdef LISP_FEATURE_SB_THREAD
 131 #define for_each_thread(th) for(th=all_threads;th;th=th->next)
 132 #else
 133 /* there's some possibility a SSC could notice this never actually
 134  * loops  */
 135 #define for_each_thread(th) for(th=all_threads;th;th=0)
 136 #endif
 137
 138 static inline lispobj *
 139 SymbolValueAddress(u64 tagged_symbol_pointer, void *thread)
 140 {
 141     struct symbol *sym= (struct symbol *)
 142         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
 143 #ifdef LISP_FEATURE_SB_THREAD
 144     if(thread && sym->tls_index) {
 145         lispobj *r = &(((union per_thread_data *)thread)
 146                        ->dynamic_values[(sym->tls_index) >> WORD_SHIFT]);
 147         if((*r)!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
 148     }
 149 #endif
 150     return &sym->value;
 151 }
 152
 153 static inline lispobj
 154 SymbolValue(u64 tagged_symbol_pointer, void *thread)
 155 {
 156     struct symbol *sym= (struct symbol *)
 157         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
 158 #ifdef LISP_FEATURE_SB_THREAD
 159     if(thread && sym->tls_index) {
 160         lispobj r=
 161             ((union per_thread_data *)thread)
 162             ->dynamic_values[(sym->tls_index) >> WORD_SHIFT];
 163         if(r!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
 164     }
 165 #endif
 166     return sym->value;
 167 }
 168
 169 static inline lispobj
 170 SymbolTlValue(u64 tagged_symbol_pointer, void *thread)
 171 {
 172     struct symbol *sym= (struct symbol *)
 173         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
 174 #ifdef LISP_FEATURE_SB_THREAD
 175     return ((union per_thread_data *)thread)
 176         ->dynamic_values[(sym->tls_index) >> WORD_SHIFT];
 177 #else
 178     return sym->value;
 179 #endif
 180 }
 181
 182 static inline void
 183 SetSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread)
 184 {
 185     struct symbol *sym= (struct symbol *)
 186         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
 187 #ifdef LISP_FEATURE_SB_THREAD
 188     if(thread && sym->tls_index) {
 189         lispobj *pr= &(((union per_thread_data *)thread)
 190                        ->dynamic_values[(sym->tls_index) >> WORD_SHIFT]);
 191         if(*pr!=NO_TLS_VALUE_MARKER_WIDETAG) {
 192             *pr=val;
 193             return;
 194         }
 195     }
 196 #endif
 197     sym->value = val;
 198 }
 199
 200 static inline void
 201 SetTlSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread)
 202 {
 203 #ifdef LISP_FEATURE_SB_THREAD
 204     struct symbol *sym= (struct symbol *)
 205         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
 206     ((union per_thread_data *)thread)
 207         ->dynamic_values[(sym->tls_index) >> WORD_SHIFT]
 208         =val;
 209 #else
 210     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
 211 #endif
 212 }
 213
 214 /* This only works for static symbols. */
 215 static inline lispobj
 216 StaticSymbolFunction(lispobj sym)
 217 {
 218     return ((struct fdefn *)native_pointer(SymbolValue(sym, 0)))->fun;
 219 }
 220
 221 /* These are for use during GC, on the current thread, or on prenatal
 222  * threads only. */
 223 #if defined(LISP_FEATURE_SB_THREAD)
 224 #define get_binding_stack_pointer(thread)       \
 225     ((thread)->binding_stack_pointer)
 226 #define set_binding_stack_pointer(thread,value) \
 227     ((thread)->binding_stack_pointer = (lispobj *)(value))
 228 #define access_control_stack_pointer(thread) \
 229     ((thread)->control_stack_pointer)
 230 #  if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64)
 231 #define access_control_frame_pointer(thread) \
 232     ((thread)->control_frame_pointer)
 233 #  endif
 234 #else
 235 #  if defined(BINDING_STACK_POINTER)
 236 #define get_binding_stack_pointer(thread)       \
 237     SymbolValue(BINDING_STACK_POINTER, thread)
 238 #define set_binding_stack_pointer(thread,value) \
 239     SetSymbolValue(BINDING_STACK_POINTER, (lispobj)(value), thread)
 240 #  else
 241 #define get_binding_stack_pointer(thread)       \
 242     (current_binding_stack_pointer)
 243 #define set_binding_stack_pointer(thread,value) \
 244     (current_binding_stack_pointer = (lispobj *)(value))
 245 #  endif
 246 #define access_control_stack_pointer(thread)    \
 247     (current_control_stack_pointer)
 248 #  if !defined(LISP_FEATURE_X86) && !defined(LISP_FEATURE_X86_64)
 249 #define access_control_frame_pointer(thread) \
 250     (current_control_frame_pointer)
 251 #  endif
 252 #endif
 253
 254 #if defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_GCC_TLS)
 255 extern __thread struct thread *current_thread;
 256 #endif
 257
 258 #ifndef LISP_FEATURE_SB_SAFEPOINT
 259 # define THREAD_CSP_PAGE_SIZE 0
 260 #elif defined(LISP_FEATURE_PPC)
 261   /* BACKEND_PAGE_BYTES is nice and large on this platform, but therefore
 262    * does not fit into an immediate, making it awkward to access the page
 263    * relative to the thread-tn... */
 264 # define THREAD_CSP_PAGE_SIZE 4096
 265 #else
 266 # define THREAD_CSP_PAGE_SIZE BACKEND_PAGE_BYTES
 267 #endif
 268
 269 #ifdef LISP_FEATURE_WIN32
 270 /*
 271  * Win32 doesn't have SIGSTKSZ, and we're not switching stacks anyway,
 272  * so define it arbitrarily
 273  */
 274 #define SIGSTKSZ 1024
 275 #endif
 276
 277 #define THREAD_STRUCT_SIZE (thread_control_stack_size + BINDING_STACK_SIZE + \
 278                             ALIEN_STACK_SIZE +                          \
 279                             sizeof(struct nonpointer_thread_data) +     \
 280                             dynamic_values_bytes +                      \
 281                             32 * SIGSTKSZ +                             \
 282                             THREAD_ALIGNMENT_BYTES +                    \
 283                             THREAD_CSP_PAGE_SIZE)
 284
 285 #if defined(LISP_FEATURE_WIN32)
 286 static inline struct thread* arch_os_get_current_thread()
 287     __attribute__((__const__));
 288 #endif
 289
 290 /* This is clearly per-arch and possibly even per-OS code, but we can't
 291  * put it somewhere sensible like x86-linux-os.c because it needs too
 292  * much stuff like struct thread and all_threads to be defined, which
 293  * usually aren't by that time.  So, it's here instead.  Sorry */
 294
 295 static inline struct thread *arch_os_get_current_thread(void)
 296 {
 297 #if !defined(LISP_FEATURE_SB_THREAD)
 298      return all_threads;
 299
 300 #elif defined(LISP_FEATURE_X86) && defined(LISP_FEATURE_WIN32)
 301     register struct thread *me=0;
 302     __asm__ ("movl %%fs:0xE10+(4*63), %0" : "=r"(me) :);
 303     return me;
 304
 305 #else
 306
 307 # if defined(LISP_FEATURE_X86)
 308     if (!all_threads) return 0;
 309 #endif
 310
 311     /* Otherwise, use pthreads to find the right value.  We do not load
 312      * directly from %fs:this even on x86 platforms (like Linux and
 313      * Solaris) with dependable %fs, because we want to return NULL if
 314      * called by a non-Lisp thread, and %fs would not be initialized
 315      * suitably in that case. */
 316     struct thread *th;
 317 # ifdef LISP_FEATURE_GCC_TLS
 318     th = current_thread;
 319 # else
 320     th = pthread_getspecific(specials);
 321 # endif
 322
 323 # if defined(LISP_FEATURE_RESTORE_FS_SEGMENT_REGISTER_FROM_TLS)
 324     /* If enabled by make-config (currently Darwin and FreeBSD only),
 325      * re-setup %fs.  This is an out-of-line call, and potentially
 326      * expensive.*/
 327     if (th)
 328         arch_os_load_ldt(th);
 329 # endif
 330
 331     return th;
 332 #endif
 333 }
 334
 335 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 336 extern kern_return_t mach_lisp_thread_init(struct thread *thread);
 337 extern kern_return_t mach_lisp_thread_destroy(struct thread *thread);
 338 #endif
 339
 340 typedef struct init_thread_data {
 341     sigset_t oldset;
 342 #ifdef LISP_FEATURE_SB_SAFEPOINT
 343     struct gcing_safety safety;
 344 #endif
 345 } init_thread_data;
 346
 347 #ifdef LISP_FEATURE_SB_SAFEPOINT
 348 void thread_in_safety_transition(os_context_t *ctx);
 349 void thread_in_lisp_raised(os_context_t *ctx);
 350 void thread_interrupted(os_context_t *ctx);
 351 void thread_pitstop(os_context_t *ctxptr);
 352 extern void thread_register_gc_trigger();
 353
 354 # ifdef LISP_FEATURE_SB_THRUPTION
 355 int wake_thread(os_thread_t os_thread);
 356 #  ifdef LISP_FEATURE_WIN32
 357 void wake_thread_win32(struct thread *thread);
 358 #  else
 359 int wake_thread_posix(os_thread_t os_thread);
 360 #  endif
 361 # endif
 362
 363 static inline
 364 void push_gcing_safety(struct gcing_safety *into)
 365 {
 366     struct thread* th = arch_os_get_current_thread();
 367     asm volatile ("");
 368     if ((into->csp_around_foreign_call =
 369          *th->csp_around_foreign_call)) {
 370         *th->csp_around_foreign_call = 0;
 371         asm volatile ("");
 372 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 373         into->pc_around_foreign_call = th->pc_around_foreign_call;
 374         th->pc_around_foreign_call = 0;
 375         asm volatile ("");
 376 #endif
 377     } else {
 378 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 379         into->pc_around_foreign_call = 0;
 380 #endif
 381     }
 382 }
 383
 384 static inline
 385 void pop_gcing_safety(struct gcing_safety *from)
 386 {
 387     struct thread* th = arch_os_get_current_thread();
 388     if (from->csp_around_foreign_call) {
 389         asm volatile ("");
 390         *th->csp_around_foreign_call = from->csp_around_foreign_call;
 391         asm volatile ("");
 392 #ifdef LISP_FEATURE_C_STACK_IS_CONTROL_STACK
 393         th->pc_around_foreign_call = from->pc_around_foreign_call;
 394         asm volatile ("");
 395 #endif
 396     }
 397 }
 398
 399 /* Even with just -O1, gcc optimizes the jumps in this "loop" away
 400  * entirely, giving the ability to define WITH-FOO-style macros. */
 401 #define RUN_BODY_ONCE(prefix, finally_do)               \
 402     int prefix##done = 0;                               \
 403     for (; !prefix##done; finally_do, prefix##done = 1)
 404
 405 #define WITH_GC_AT_SAFEPOINTS_ONLY_hygenic(var)        \
 406     struct gcing_safety var;                    \
 407     push_gcing_safety(&var);                    \
 408     RUN_BODY_ONCE(var, pop_gcing_safety(&var))
 409
 410 #define WITH_GC_AT_SAFEPOINTS_ONLY()                           \
 411     WITH_GC_AT_SAFEPOINTS_ONLY_hygenic(sbcl__gc_safety)
 412
 413 #define WITH_STATE_SEM_hygenic(var, thread)                             \
 414     os_sem_wait((thread)->state_sem, "thread_state");                   \
 415     RUN_BODY_ONCE(var, os_sem_post((thread)->state_sem, "thread_state"))
 416
 417 #define WITH_STATE_SEM(thread)                                     \
 418     WITH_STATE_SEM_hygenic(sbcl__state_sem, thread)
 419
 420 int check_pending_thruptions(os_context_t *ctx);
 421
 422 void attach_os_thread(init_thread_data *);
 423 void detach_os_thread(init_thread_data *);
 424
 425 # if defined(LISP_FEATURE_SB_SAFEPOINT_STRICTLY) && !defined(LISP_FEATURE_WIN32)
 426
 427 void signal_handler_callback(lispobj, int, void *, void *);
 428 # endif
 429
 430 #endif
 431
 432 extern void create_initial_thread(lispobj);
 433
 434 #ifdef LISP_FEATURE_SB_THREAD
 435 extern pthread_mutex_t all_threads_lock;
 436 #endif
 437
 438 #endif /* _INCLUDE_THREAD_H_ */