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
  25 #define THREAD_SLOT_OFFSET_WORDS(c) \
  26  (offsetof(struct thread,c)/(sizeof (struct thread *)))
  27
  28 union per_thread_data {
  29     struct thread thread;
  30     lispobj dynamic_values[1];  /* actually more like 4000 or so */
  31 };
  32
  33 extern struct thread *all_threads;
  34 extern int dynamic_values_bytes;
  35 extern struct thread *find_thread_by_pid(pid_t pid);
  36
  37 #ifdef LISP_FEATURE_SB_THREAD
  38 #define for_each_thread(th) for(th=all_threads;th;th=th->next)
  39 #else
  40 /* there's some possibility a SSC could notice this never actually
  41  * loops  */
  42 #define for_each_thread(th) for(th=all_threads;th;th=0)
  43 #endif
  44
  45 static inline lispobj SymbolValue(u32 tagged_symbol_pointer, void *thread) {
  46     struct symbol *sym= (struct symbol *)
  47         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  48 #ifdef LISP_FEATURE_SB_THREAD
  49     if(thread && sym->tls_index) {
  50         lispobj r=
  51             ((union per_thread_data *)thread)
  52             ->dynamic_values[fixnum_value(sym->tls_index)];
  53         if(r!=UNBOUND_MARKER_WIDETAG) return r;
  54     }
  55 #endif
  56     return sym->value;
  57 }
  58 static inline lispobj SymbolTlValue(u32 tagged_symbol_pointer, void *thread) {
  59     struct symbol *sym= (struct symbol *)
  60         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  61 #ifdef LISP_FEATURE_SB_THREAD
  62     return ((union per_thread_data *)thread)
  63         ->dynamic_values[fixnum_value(sym->tls_index)];
  64 #else
  65     return sym->value;
  66 #endif
  67 }
  68
  69 static inline void SetSymbolValue(u32 tagged_symbol_pointer,lispobj val, void *thread) {
  70     struct symbol *sym= (struct symbol *)
  71         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  72 #ifdef LISP_FEATURE_SB_THREAD
  73     if(thread && sym->tls_index) {
  74         lispobj *pr= &(((union per_thread_data *)thread)
  75                        ->dynamic_values[fixnum_value(sym->tls_index)]);
  76         if(*pr!= UNBOUND_MARKER_WIDETAG) {
  77             *pr=val;
  78             return;
  79         }
  80     }
  81 #endif
  82     sym->value = val;
  83 }
  84 static inline void SetTlSymbolValue(u32 tagged_symbol_pointer,lispobj val, void *thread) {
  85 #ifdef LISP_FEATURE_SB_THREAD
  86     struct symbol *sym= (struct symbol *)
  87         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  88     ((union per_thread_data *)thread)
  89         ->dynamic_values[fixnum_value(sym->tls_index)]
  90         =val;
  91 #else
  92     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
  93 #endif
  94 }
  95
  96 static inline os_context_t *get_interrupt_context_for_thread(struct thread *th)
  97 {
  98     return th->interrupt_contexts
  99         [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
 100 }
 101
 102 /* This is clearly per-arch and possibly even per-OS code, but we can't
 103  * put it somewhere sensible like x86-linux-os.c because it needs too
 104  * much stuff like struct thread and all_threads to be defined, which
 105  * usually aren't by that time.  So, it's here instead.  Sorry */
 106
 107 static inline struct thread *arch_os_get_current_thread() {
 108 #if defined(LISP_FEATURE_SB_THREAD) && defined (LISP_FEATURE_X86)
 109     register struct thread *me=0;
 110     if(all_threads)
 111         __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
 112                  : "i" (offsetof (struct thread,this)));
 113     return me;
 114 #else
 115     return all_threads;
 116 #endif
 117 }
 118
 119
 120 int arch_os_thread_init(struct thread *thread);
 121 extern struct thread *arch_os_get_current_thread();
 122
 123 #endif /* _INCLUDE_THREAD_H_ */