src/runtime/thread.h

   1
   2 #if !defined(_INCLUDE_THREAD_H_)
   3 #define _INCLUDE_THREAD_H_
   4
   5 #include <sys/types.h>
   6 #include <unistd.h>
   7 #include <stddef.h>
   8 #include "sbcl.h"
   9 #include "runtime.h"
  10 #include "os.h"
  11 #include "interrupt.h"
  12 #ifdef LISP_FEATURE_GENCGC
  13 #include "gencgc-alloc-region.h"
  14 #else
  15 struct alloc_region { };
  16 #endif
  17 #include "genesis/symbol.h"
  18 #include "genesis/static-symbols.h"
  19 #include "genesis/thread.h"
  20
  21 #define STATE_RUNNING (make_fixnum(0))
  22 #define STATE_STOPPING (make_fixnum(1))
  23 #define STATE_STOPPED (make_fixnum(2))
  24 #define STATE_DEAD (make_fixnum(3))
  25
  26 #define THREAD_SLOT_OFFSET_WORDS(c) \
  27  (offsetof(struct thread,c)/(sizeof (struct thread *)))
  28
  29 union per_thread_data {
  30     struct thread thread;
  31     lispobj dynamic_values[1];  /* actually more like 4000 or so */
  32 };
  33
  34 extern struct thread *all_threads;
  35 extern int dynamic_values_bytes;
  36 extern struct thread *find_thread_by_pid(pid_t pid);
  37
  38 #ifdef LISP_FEATURE_SB_THREAD
  39 #define for_each_thread(th) for(th=all_threads;th;th=th->next)
  40 #else
  41 /* there's some possibility a SSC could notice this never actually
  42  * loops  */
  43 #define for_each_thread(th) for(th=all_threads;th;th=0)
  44 #endif
  45
  46 static inline lispobj SymbolValue(u64 tagged_symbol_pointer, void *thread) {
  47     struct symbol *sym= (struct symbol *)
  48         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  49 #ifdef LISP_FEATURE_SB_THREAD
  50     if(thread && sym->tls_index) {
  51         lispobj r=
  52             ((union per_thread_data *)thread)
  53             ->dynamic_values[fixnum_value(sym->tls_index)];
  54         if(r!=UNBOUND_MARKER_WIDETAG) return r;
  55     }
  56 #endif
  57     return sym->value;
  58 }
  59 static inline lispobj SymbolTlValue(u64 tagged_symbol_pointer, void *thread) {
  60     struct symbol *sym= (struct symbol *)
  61         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  62 #ifdef LISP_FEATURE_SB_THREAD
  63     return ((union per_thread_data *)thread)
  64         ->dynamic_values[fixnum_value(sym->tls_index)];
  65 #else
  66     return sym->value;
  67 #endif
  68 }
  69
  70 static inline void SetSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  71     struct symbol *sym= (struct symbol *)
  72         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  73 #ifdef LISP_FEATURE_SB_THREAD
  74     if(thread && sym->tls_index) {
  75         lispobj *pr= &(((union per_thread_data *)thread)
  76                        ->dynamic_values[fixnum_value(sym->tls_index)]);
  77         if(*pr!= UNBOUND_MARKER_WIDETAG) {
  78             *pr=val;
  79             return;
  80         }
  81     }
  82 #endif
  83     sym->value = val;
  84 }
  85 static inline void SetTlSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  86 #ifdef LISP_FEATURE_SB_THREAD
  87     struct symbol *sym= (struct symbol *)
  88         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  89     ((union per_thread_data *)thread)
  90         ->dynamic_values[fixnum_value(sym->tls_index)]
  91         =val;
  92 #else
  93     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
  94 #endif
  95 }
  96
  97 static inline os_context_t *get_interrupt_context_for_thread(struct thread *th)
  98 {
  99     return th->interrupt_contexts
 100         [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
 101 }
 102
 103 /* This is clearly per-arch and possibly even per-OS code, but we can't
 104  * put it somewhere sensible like x86-linux-os.c because it needs too
 105  * much stuff like struct thread and all_threads to be defined, which
 106  * usually aren't by that time.  So, it's here instead.  Sorry */
 107
 108 static inline struct thread *arch_os_get_current_thread() {
 109 #if defined(LISP_FEATURE_SB_THREAD) && defined (LISP_FEATURE_X86)
 110     register struct thread *me=0;
 111     if(all_threads)
 112         __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
 113                  : "i" (offsetof (struct thread,this)));
 114     return me;
 115 #else
 116     return all_threads;
 117 #endif
 118 }
 119
 120
 121 int arch_os_thread_init(struct thread *thread);
 122 extern void create_initial_thread(lispobj);
 123
 124 #endif /* _INCLUDE_THREAD_H_ */