+/* This only works for static symbols. */
+static inline lispobj
+StaticSymbolFunction(lispobj sym)
+{
+ return ((struct fdefn *)native_pointer(SymbolValue(sym, 0)))->fun;
+}
+
+static inline
+os_context_t *get_interrupt_context_for_thread(struct thread *th)
+{
+ return th->interrupt_contexts
+ [fixnum_value(SymbolValue(FREE_INTERRUPT_CONTEXT_INDEX,th)-1)];
+}
+
+#if defined(LISP_FEATURE_SB_THREAD) && defined(LISP_FEATURE_GCC_TLS)
+extern __thread struct thread *current_thread;
+#endif
+
+/* This is clearly per-arch and possibly even per-OS code, but we can't
+ * put it somewhere sensible like x86-linux-os.c because it needs too
+ * much stuff like struct thread and all_threads to be defined, which
+ * usually aren't by that time. So, it's here instead. Sorry */
+
+static inline struct thread *arch_os_get_current_thread(void)
+{
+#if defined(LISP_FEATURE_SB_THREAD)
+#if defined(LISP_FEATURE_X86)
+ register struct thread *me=0;
+ if(all_threads) {
+#if defined(LISP_FEATURE_DARWIN) && defined(LISP_FEATURE_RESTORE_FS_SEGMENT_REGISTER_FROM_TLS)
+ sel_t sel;
+ struct thread *th = pthread_getspecific(specials);
+ sel.index = th->tls_cookie;
+ sel.rpl = USER_PRIV;
+ sel.ti = SEL_LDT;
+ __asm__ __volatile__ ("movw %w0, %%fs" : : "r"(sel));
+#elif defined(LISP_FEATURE_FREEBSD)
+#ifdef LISP_FEATURE_GCC_TLS
+ struct thread *th = current_thread;
+#else
+ struct thread *th = pthread_getspecific(specials);
+#endif
+#ifdef LISP_FEATURE_RESTORE_TLS_SEGMENT_REGISTER_FROM_TLS
+ unsigned int sel = LSEL(th->tls_cookie, SEL_UPL);
+ unsigned int fs = rfs();
+
+ /* Load FS only if it's necessary. Modifying a selector
+ * causes privilege checking and it takes long time. */
+ if (fs != sel)
+ load_fs(sel);
+#endif
+ return th;
+#endif
+ __asm__ __volatile__ ("movl %%fs:%c1,%0" : "=r" (me)
+ : "i" (offsetof (struct thread,this)));
+ }
+ return me;
+#else
+#ifdef LISP_FEATURE_GCC_TLS
+ return current_thread;
+#else
+ return pthread_getspecific(specials);
+#endif
+#endif /* x86 */
+#else
+ return all_threads;
+#endif
+}
+
+#if defined(LISP_FEATURE_MACH_EXCEPTION_HANDLER)
+#define THREAD_STRUCT_TO_EXCEPTION_PORT(th) ((mach_port_t) th)
+#define EXCEPTION_PORT_TO_THREAD_STRUCT(th) ((struct thread *) th)
+#endif
+
+#if defined(LISP_FEATURE_SB_THREAD)
+#define thread_self pthread_self
+#define thread_kill pthread_kill
+#define thread_sigmask pthread_sigmask
+#define thread_mutex_lock(l) pthread_mutex_lock(l)
+#define thread_mutex_unlock(l) pthread_mutex_unlock(l)
+#else
+#define thread_self getpid
+#define thread_kill kill
+#define thread_sigmask sigprocmask
+#define thread_mutex_lock(l) 0
+#define thread_mutex_unlock(l) 0
+#endif
+
+extern void create_initial_thread(lispobj);
+extern int kill_thread_safely(os_thread_t os_thread, int signo);