src/runtime/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 #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(1))
  22 #define STATE_SUSPENDED (make_fixnum(2))
  23 #define STATE_DEAD (make_fixnum(3))
  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 * volatile all_threads;
  34 extern int dynamic_values_bytes;
  35
  36 #ifdef LISP_FEATURE_SB_THREAD
  37 #define for_each_thread(th) for(th=all_threads;th;th=th->next)
  38 #else
  39 /* there's some possibility a SSC could notice this never actually
  40  * loops  */
  41 #define for_each_thread(th) for(th=all_threads;th;th=0)
  42 #endif
  43
  44 static inline lispobj SymbolValue(u64 tagged_symbol_pointer, void *thread) {
  45     struct symbol *sym= (struct symbol *)
  46         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  47 #ifdef LISP_FEATURE_SB_THREAD
  48     if(thread && sym->tls_index) {
  49         lispobj r=
  50             ((union per_thread_data *)thread)
  51             ->dynamic_values[fixnum_value(sym->tls_index)];
  52         if(r!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
  53     }
  54 #endif
  55     return sym->value;
  56 }
  57 static inline lispobj SymbolTlValue(u64 tagged_symbol_pointer, void *thread) {
  58     struct symbol *sym= (struct symbol *)
  59         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  60 #ifdef LISP_FEATURE_SB_THREAD
  61     return ((union per_thread_data *)thread)
  62         ->dynamic_values[fixnum_value(sym->tls_index)];
  63 #else
  64     return sym->value;
  65 #endif
  66 }
  67
  68 static inline void SetSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  69     struct symbol *sym= (struct symbol *)
  70         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  71 #ifdef LISP_FEATURE_SB_THREAD
  72     if(thread && sym->tls_index) {
  73         lispobj *pr= &(((union per_thread_data *)thread)
  74                        ->dynamic_values[fixnum_value(sym->tls_index)]);
  75         if(*pr!=NO_TLS_VALUE_MARKER_WIDETAG) {
  76             *pr=val;
  77             return;
  78         }
  79     }
  80 #endif
  81     sym->value = val;
  82 }
  83 static inline void SetTlSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  84 #ifdef LISP_FEATURE_SB_THREAD
  85     struct symbol *sym= (struct symbol *)
  86         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  87     ((union per_thread_data *)thread)
  88         ->dynamic_values[fixnum_value(sym->tls_index)]
  89         =val;
  90 #else
  91     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
  92 #endif
  93 }
  94
  95 static inline os_context_t *get_interrupt_context_for_thread(struct thread *th)
  96 {
  97     return th->interrupt_contexts
  98         [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
  99 }
 100
 101 /* This is clearly per-arch and possibly even per-OS code, but we can't
 102  * put it somewhere sensible like x86-linux-os.c because it needs too
 103  * much stuff like struct thread and all_threads to be defined, which
 104  * usually aren't by that time.  So, it's here instead.  Sorry */
 105
 106 static inline struct thread *arch_os_get_current_thread() {
 107 #if defined(LISP_FEATURE_SB_THREAD)
 108 #if 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 pthread_getspecific(specials);
 116 #endif /* x86 */
 117 #else
 118      return all_threads;
 119 #endif
 120 }
 121
 122 #if defined(LISP_FEATURE_SB_THREAD)
 123 #define thread_self pthread_self
 124 #define thread_kill pthread_kill
 125 #define thread_sigmask pthread_sigmask
 126 #else
 127 #define thread_self getpid
 128 #define thread_kill kill
 129 #define thread_sigmask sigprocmask
 130 #endif
 131
 132 extern void create_initial_thread(lispobj);
 133
 134 #endif /* _INCLUDE_THREAD_H_ */