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_STARTING (make_fixnum(0))
  22 #define STATE_RUNNING (make_fixnum(1))
  23 #define STATE_SUSPENDED (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 * volatile all_threads;
  35 extern int dynamic_values_bytes;
  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
  46 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!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
  55     }
  56 #endif
  57     return sym->value;
  58 }
  59
  60 static inline lispobj
  61 SymbolTlValue(u64 tagged_symbol_pointer, void *thread) {
  62     struct symbol *sym= (struct symbol *)
  63         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  64 #ifdef LISP_FEATURE_SB_THREAD
  65     return ((union per_thread_data *)thread)
  66         ->dynamic_values[fixnum_value(sym->tls_index)];
  67 #else
  68     return sym->value;
  69 #endif
  70 }
  71
  72 static inline void
  73 SetSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  74     struct symbol *sym= (struct symbol *)
  75         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  76 #ifdef LISP_FEATURE_SB_THREAD
  77     if(thread && sym->tls_index) {
  78         lispobj *pr= &(((union per_thread_data *)thread)
  79                        ->dynamic_values[fixnum_value(sym->tls_index)]);
  80         if(*pr!=NO_TLS_VALUE_MARKER_WIDETAG) {
  81             *pr=val;
  82             return;
  83         }
  84     }
  85 #endif
  86     sym->value = val;
  87 }
  88 static inline void
  89 SetTlSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  90 #ifdef LISP_FEATURE_SB_THREAD
  91     struct symbol *sym= (struct symbol *)
  92         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  93     ((union per_thread_data *)thread)
  94         ->dynamic_values[fixnum_value(sym->tls_index)]
  95         =val;
  96 #else
  97     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
  98 #endif
  99 }
 100
 101 static inline
 102 os_context_t *get_interrupt_context_for_thread(struct thread *th)
 103 {
 104     return th->interrupt_contexts
 105         [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
 106 }
 107
 108 /* This is clearly per-arch and possibly even per-OS code, but we can't
 109  * put it somewhere sensible like x86-linux-os.c because it needs too
 110  * much stuff like struct thread and all_threads to be defined, which
 111  * usually aren't by that time.  So, it's here instead.  Sorry */
 112
 113 static inline struct thread *arch_os_get_current_thread() {
 114 #if defined(LISP_FEATURE_SB_THREAD)
 115 #if defined(LISP_FEATURE_X86)
 116     register struct thread *me=0;
 117     if(all_threads)
 118         __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
 119                  : "i" (offsetof (struct thread,this)));
 120     return me;
 121 #else
 122     return pthread_getspecific(specials);
 123 #endif /* x86 */
 124 #else
 125      return all_threads;
 126 #endif
 127 }
 128
 129 #if defined(LISP_FEATURE_SB_THREAD)
 130 #define thread_self pthread_self
 131 #define thread_kill pthread_kill
 132 #define thread_sigmask pthread_sigmask
 133 #define thread_mutex_lock(l) pthread_mutex_lock(l)
 134 #define thread_mutex_unlock(l) pthread_mutex_unlock(l)
 135 #else
 136 #define thread_self getpid
 137 #define thread_kill kill
 138 #define thread_sigmask sigprocmask
 139 #define thread_mutex_lock(l)
 140 #define thread_mutex_unlock(l)
 141 #endif
 142
 143 extern void create_initial_thread(lispobj);
 144
 145 #endif /* _INCLUDE_THREAD_H_ */