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 #include "genesis/fdefn.h"
  21
  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 {
  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!=NO_TLS_VALUE_MARKER_WIDETAG) return r;
  56     }
  57 #endif
  58     return sym->value;
  59 }
  60
  61 static inline lispobj
  62 SymbolTlValue(u64 tagged_symbol_pointer, void *thread)
  63 {
  64     struct symbol *sym= (struct symbol *)
  65         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  66 #ifdef LISP_FEATURE_SB_THREAD
  67     return ((union per_thread_data *)thread)
  68         ->dynamic_values[fixnum_value(sym->tls_index)];
  69 #else
  70     return sym->value;
  71 #endif
  72 }
  73
  74 static inline void
  75 SetSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread)
  76 {
  77     struct symbol *sym= (struct symbol *)
  78         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  79 #ifdef LISP_FEATURE_SB_THREAD
  80     if(thread && sym->tls_index) {
  81         lispobj *pr= &(((union per_thread_data *)thread)
  82                        ->dynamic_values[fixnum_value(sym->tls_index)]);
  83         if(*pr!=NO_TLS_VALUE_MARKER_WIDETAG) {
  84             *pr=val;
  85             return;
  86         }
  87     }
  88 #endif
  89     sym->value = val;
  90 }
  91
  92 static inline void
  93 SetTlSymbolValue(u64 tagged_symbol_pointer,lispobj val, void *thread)
  94 {
  95 #ifdef LISP_FEATURE_SB_THREAD
  96     struct symbol *sym= (struct symbol *)
  97         (pointer_sized_uint_t)(tagged_symbol_pointer-OTHER_POINTER_LOWTAG);
  98     ((union per_thread_data *)thread)
  99         ->dynamic_values[fixnum_value(sym->tls_index)]
 100         =val;
 101 #else
 102     SetSymbolValue(tagged_symbol_pointer,val,thread) ;
 103 #endif
 104 }
 105
 106 /* This only works for static symbols. */
 107 static inline lispobj
 108 StaticSymbolFunction(lispobj sym)
 109 {
 110     return ((struct fdefn *)native_pointer(SymbolValue(sym, 0)))->fun;
 111 }
 112
 113 static inline
 114 os_context_t *get_interrupt_context_for_thread(struct thread *th)
 115 {
 116     return th->interrupt_contexts
 117         [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
 118 }
 119
 120 #if defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_GCC_TLS)
 121 extern __thread struct thread *current_thread;
 122 #endif
 123
 124 /* This is clearly per-arch and possibly even per-OS code, but we can't
 125  * put it somewhere sensible like x86-linux-os.c because it needs too
 126  * much stuff like struct thread and all_threads to be defined, which
 127  * usually aren't by that time.  So, it's here instead.  Sorry */
 128
 129 static inline struct thread *arch_os_get_current_thread(void)
 130 {
 131 #if defined(LISP_FEATURE_SB_THREAD)
 132 #if defined(LISP_FEATURE_X86)
 133     register struct thread *me=0;
 134     if(all_threads) {
 135 #if defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_RESTORE_FS_SEGMENT_REGISTER_FROM_TLS)
 136         sel_t sel;
 137         struct thread *th = pthread_getspecific(specials);
 138         sel.index = th->tls_cookie;
 139         sel.rpl = USER_PRIV;
 140         sel.ti = SEL_LDT;
 141         __asm__ __volatile__ ("movw %w0, %%fs" : : "r"(sel));
 142 #elif defined(LISP_FEATURE_FREEBSD)
 143 #ifdef LISP_FEATURE_GCC_TLS
 144         struct thread *th = current_thread;
 145 #else
 146         struct thread *th = pthread_getspecific(specials);
 147 #endif
 148 #ifdef LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_TLS
 149         unsigned int sel = LSEL(th->tls_cookie, SEL_UPL);
 150         unsigned int fs = rfs();
 151
 152         /* Load FS only if it's necessary.  Modifying a selector
 153          * causes privilege checking and it takes long time. */
 154         if (fs != sel)
 155             load_fs(sel);
 156 #endif
 157         return th;
 158 #endif
 159         __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
 160                  : "i" (offsetof (struct thread,this)));
 161     }
 162     return me;
 163 #else
 164 #ifdef LISP_FEATURE_GCC_TLS
 165     return current_thread;
 166 #else
 167     return pthread_getspecific(specials);
 168 #endif
 169 #endif /* x86 */
 170 #else
 171      return all_threads;
 172 #endif
 173 }
 174
 175 #if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
 176 #define THREAD_STRUCT_TO_EXCEPTION_PORT(th) ((mach_port_t) th)
 177 #define EXCEPTION_PORT_TO_THREAD_STRUCT(th) ((struct thread *) th)
 178 #endif
 179
 180 #if defined(LISP_FEATURE_SB_THREAD)
 181 #define thread_self pthread_self
 182 #define thread_kill pthread_kill
 183 #define thread_sigmask pthread_sigmask
 184 #define thread_mutex_lock(l) pthread_mutex_lock(l)
 185 #define thread_mutex_unlock(l) pthread_mutex_unlock(l)
 186 #else
 187 #define thread_self getpid
 188 #define thread_kill kill
 189 #define thread_sigmask sigprocmask
 190 #define thread_mutex_lock(l) 0
 191 #define thread_mutex_unlock(l) 0
 192 #endif
 193
 194 extern void create_initial_thread(lispobj);
 195 extern int kill_thread_safely(os_thread_t os_thread, int signo);
 196
 197 #endif /* _INCLUDE_THREAD_H_ */