+/* Backend thread functions */
+
+/* Create a new thread of execution. */
+static inline objc_thread_t
+__gthread_objc_thread_detach (void (*func)(void *), void *arg)
+{
+ objc_thread_t thread_id;
+ pthread_t new_thread_handle;
+
+ if (!__gthread_active_p ())
+ return NULL;
+
+ if (!(__gthrw_(pthread_create) (&new_thread_handle, pthread_attr_default,
+ (void *) func, arg)))
+ {
+ /* ??? May not work! (64bit) */
+ thread_id = *(objc_thread_t *) &new_thread_handle;
+ pthread_detach (&new_thread_handle); /* Fully detach thread. */
+ }
+ else
+ thread_id = NULL;
+
+ return thread_id;
+}
+
+/* Set the current thread's priority. */
+static inline int
+__gthread_objc_thread_set_priority (int priority)
+{
+ int sys_priority = 0;
+
+ if (!__gthread_active_p ())
+ return -1;
+
+ switch (priority)
+ {
+ case OBJC_THREAD_INTERACTIVE_PRIORITY:
+ sys_priority = (PRI_FG_MIN_NP + PRI_FG_MAX_NP) / 2;
+ break;
+ default:
+ case OBJC_THREAD_BACKGROUND_PRIORITY:
+ sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
+ break;
+ case OBJC_THREAD_LOW_PRIORITY:
+ sys_priority = (PRI_BG_MIN_NP + PRI_BG_MAX_NP) / 2;
+ break;
+ }
+
+ /* Change the priority. */
+ if (pthread_setprio (__gthrw_(pthread_self) (), sys_priority) >= 0)
+ return 0;
+ else
+ /* Failed */
+ return -1;
+}
+
+/* Return the current thread's priority. */
+static inline int
+__gthread_objc_thread_get_priority (void)
+{
+ int sys_priority;
+
+ if (__gthread_active_p ())
+ {
+ if ((sys_priority = pthread_getprio (__gthrw_(pthread_self) ())) >= 0)
+ {
+ if (sys_priority >= PRI_FG_MIN_NP
+ && sys_priority <= PRI_FG_MAX_NP)
+ return OBJC_THREAD_INTERACTIVE_PRIORITY;
+ if (sys_priority >= PRI_BG_MIN_NP
+ && sys_priority <= PRI_BG_MAX_NP)
+ return OBJC_THREAD_BACKGROUND_PRIORITY;
+ return OBJC_THREAD_LOW_PRIORITY;
+ }
+
+ /* Failed */
+ return -1;
+ }
+ else
+ return OBJC_THREAD_INTERACTIVE_PRIORITY;
+}
+
+/* Yield our process time to another thread. */
+static inline void
+__gthread_objc_thread_yield (void)
+{
+ if (__gthread_active_p ())
+ __gthrw_(pthread_yield) ();
+}
+
+/* Terminate the current thread. */
+static inline int
+__gthread_objc_thread_exit (void)
+{
+ if (__gthread_active_p ())
+ /* exit the thread */
+ __gthrw_(pthread_exit) (&__objc_thread_exit_status);
+
+ /* Failed if we reached here */
+ return -1;
+}
+
+/* Returns an integer value which uniquely describes a thread. */
+static inline objc_thread_t
+__gthread_objc_thread_id (void)
+{
+ if (__gthread_active_p ())
+ {
+ pthread_t self = __gthrw_(pthread_self) ();
+
+ return (objc_thread_t) __gthrw_pthread_getunique_np (&self);
+ }
+ else
+ return (objc_thread_t) 1;
+}
+
+/* Sets the thread's local storage pointer. */