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