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 "runtime.h"
   9 #include "sbcl.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 THREAD_SLOT_OFFSET_WORDS(c) \
  22  (offsetof(struct thread,c)/(sizeof (struct thread *)))
  23
  24 union per_thread_data {
  25     struct thread thread;
  26     lispobj dynamic_values[1];  /* actually more like 4000 or so */
  27 };
  28
  29 extern struct thread *all_threads;
  30 extern int dynamic_values_bytes;
  31 extern struct thread *find_thread_by_pid(pid_t pid);
  32
  33 #ifdef LISP_FEATURE_SB_THREAD
  34 #define for_each_thread(th) for(th=all_threads;th;th=th->next)
  35 #else
  36 /* there's some possibility a SSC could notice this never actually
  37  * loops  */
  38 #define for_each_thread(th) for(th=all_threads;th;th=0)
  39 #endif
  40
  41 static inline lispobj SymbolValue(u32 tagged_symbol_pointer, void *thread) {
  42     struct symbol *sym= (struct symbol *)
  43         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  44 #ifdef LISP_FEATURE_SB_THREAD
  45     if(thread && sym->tls_index) {
  46         lispobj r=
  47             ((union per_thread_data *)thread)
  48             ->dynamic_values[fixnum_value(sym->tls_index)];
  49         if(r!=UNBOUND_MARKER_WIDETAG) return r;
  50     }
  51 #endif
  52     return sym->value;
  53 }
  54 static inline lispobj SymbolTlValue(u32 tagged_symbol_pointer, void *thread) {
  55     struct symbol *sym= (struct symbol *)
  56         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  57 #ifdef LISP_FEATURE_SB_THREAD
  58     return ((union per_thread_data *)thread)
  59         ->dynamic_values[fixnum_value(sym->tls_index)];
  60 #else
  61     return sym->value;
  62 #endif
  63 }
  64
  65 static inline void SetSymbolValue(u32 tagged_symbol_pointer,lispobj val, void *thread) {
  66     struct symbol *sym= (struct symbol *)
  67         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  68 #ifdef LISP_FEATURE_SB_THREAD
  69     if(thread && sym->tls_index) {
  70         lispobj *pr= &(((union per_thread_data *)thread)
  71                        ->dynamic_values[fixnum_value(sym->tls_index)]);
  72         if(*pr!= UNBOUND_MARKER_WIDETAG) {
  73             *pr=val;
  74             return;
  75         }
  76     }
  77 #endif
  78     sym->value = val;
  79 }
  80 static inline void SetTlSymbolValue(u32 tagged_symbol_pointer,lispobj val, void *thread) {
  81 #ifdef LISP_FEATURE_SB_THREAD
  82     struct symbol *sym= (struct symbol *)
  83         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  84     ((union per_thread_data *)thread)
  85         ->dynamic_values[fixnum_value(sym->tls_index)]
  86         =val;
  87 #else
  88     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
  89 #endif
  90 }
  91
  92 static inline os_context_t *get_interrupt_context_for_thread(struct thread *th)
  93 {
  94     return th->interrupt_contexts
  95         [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
  96 }
  97
  98 /* This is clearly per-arch and possibly even per-OS code, but we can't
  99  * put it somewhere sensible like x86-linux-os.c because it needs too
 100  * much stuff like struct thread and all_threads to be defined, which
 101  * usually aren't by that time.  So, it's here instead.  Sorry */
 102
 103 inline static struct thread *arch_os_get_current_thread() {
 104 #if defined(LISP_FEATURE_SB_THREAD) && defined (LISP_FEATURE_X86)
 105     register struct thread *me=0;
 106     if(all_threads)
 107         __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
 108                  : "i" (offsetof (struct thread,this)));
 109     return me;
 110 #else
 111     return all_threads;
 112 #endif
 113 }
 114
 115
 116 int arch_os_thread_init(struct thread *thread);
 117 extern struct thread *arch_os_get_current_thread();
 118
 119 #endif /* _INCLUDE_THREAD_H_ */