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
  45 SymbolValue(u64 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!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
  54     }
  55 #endif
  56     return sym->value;
  57 }
  58
  59 static inline lispobj
  60 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
  72 SetSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  73     struct symbol *sym= (struct symbol *)
  74         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  75 #ifdef LISP_FEATURE_SB_THREAD
  76     if(thread && sym->tls_index) {
  77         lispobj *pr= &(((union per_thread_data *)thread)
  78                        ->dynamic_values[fixnum_value(sym->tls_index)]);
  79         if(*pr!=NO_TLS_VALUE_MARKER_WIDETAG) {
  80             *pr=val;
  81             return;
  82         }
  83     }
  84 #endif
  85     sym->value = val;
  86 }
  87 static inline void
  88 SetTlSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread) {
  89 #ifdef LISP_FEATURE_SB_THREAD
  90     struct symbol *sym= (struct symbol *)
  91         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  92     ((union per_thread_data *)thread)
  93         ->dynamic_values[fixnum_value(sym->tls_index)]
  94         =val;
  95 #else
  96     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
  97 #endif
  98 }
  99
 100 static inline
 101 os_context_t *get_interrupt_context_for_thread(struct thread *th)
 102 {
 103     return th->interrupt_contexts
 104         [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
 105 }
 106
 107 /* This is clearly per-arch and possibly even per-OS code, but we can't
 108  * put it somewhere sensible like x86-linux-os.c because it needs too
 109  * much stuff like struct thread and all_threads to be defined, which
 110  * usually aren't by that time.  So, it's here instead.  Sorry */
 111
 112 static inline struct thread *arch_os_get_current_thread() {
 113 #if defined(LISP_FEATURE_SB_THREAD)
 114 #if defined(LISP_FEATURE_X86)
 115     register struct thread *me=0;
 116     if(all_threads) {
 117 #if defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_RESTORE_FS_SEGMENT_REGISTER_FROM_TLS)
 118         sel_t sel;
 119         struct thread *th = pthread_getspecific(specials);
 120         sel.index = th->tls_cookie;
 121         sel.rpl = USER_PRIV;
 122         sel.ti = SEL_LDT;
 123         __asm__ __volatile__ ("movw %w0, %%fs" : : "r"(sel));
 124 #elif defined(LISP_FEATURE_FREEBSD) && defined(LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_TLS)
 125         struct thread *th = pthread_getspecific(specials);
 126         unsigned int sel = LSEL(th->tls_cookie, SEL_UPL);
 127         unsigned int fs = rfs();
 128
 129         /* Load FS only if it's necessary.  Modifying a selector
 130          * causes privilege checking and it takes long time. */
 131         if (fs != sel)
 132             load_fs(sel);
 133         return th;
 134 #endif
 135         __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
 136                  : "i" (offsetof (struct thread,this)));
 137     }
 138     return me;
 139 #else
 140     return pthread_getspecific(specials);
 141 #endif /* x86 */
 142 #else
 143      return all_threads;
 144 #endif
 145 }
 146
 147 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 148 #define THREAD_STRUCT_TO_EXCEPTION_PORT(th) ((mach_port_t) th)
 149 #define EXCEPTION_PORT_TO_THREAD_STRUCT(th) ((struct thread *) th)
 150 #endif
 151
 152 #if defined(LISP_FEATURE_SB_THREAD)
 153 #define thread_self pthread_self
 154 #define thread_kill pthread_kill
 155 #define thread_sigmask pthread_sigmask
 156 #define thread_mutex_lock(l) pthread_mutex_lock(l)
 157 #define thread_mutex_unlock(l) pthread_mutex_unlock(l)
 158 #else
 159 #define thread_self getpid
 160 #define thread_kill kill
 161 #define thread_sigmask sigprocmask
 162 #define thread_mutex_lock(l) 0
 163 #define thread_mutex_unlock(l) 0
 164 #endif
 165
 166 extern void create_initial_thread(lispobj);
 167 extern int kill_thread_safely(os_thread_t os_thread, int signo);
 168
 169 #endif /* _INCLUDE_THREAD_H_ */