-/* Threads compatibily routines for libgcc2. */
+/* Threads compatibility routines for libgcc2 and libobjc. */
/* Compile this one with gcc. */
-/* Copyright (C) 1997 Free Software Foundation, Inc.
+/* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
This file is part of GNU CC.
#pragma weak pthread_mutex_trylock
#pragma weak pthread_mutex_unlock
+#ifdef _LIBOBJC
+/* Objective C. */
+#pragma weak pthread_cond_broadcast
+#pragma weak pthread_cond_destroy
+#pragma weak pthread_cond_init
+#pragma weak pthread_cond_signal
+#pragma weak pthread_cond_wait
+#pragma weak pthread_exit
+#pragma weak pthread_mutex_init
+#pragma weak pthread_mutex_destroy
+#pragma weak pthread_self
+#pragma weak sched_yield
+#pragma weak pthread_attr_destroy
+#pragma weak pthread_attr_init
+#pragma weak pthread_attr_setdetachstate
+#pragma weak pthread_getschedparam
+#pragma weak pthread_setschedparam
+#endif
+
static void *__gthread_active_ptr = &pthread_create;
static inline int
-__gthread_active_p ()
+__gthread_active_p (void)
{
return __gthread_active_ptr != 0;
}
#else /* not SUPPORTS_WEAK */
static inline int
-__gthread_active_p ()
+__gthread_active_p (void)
{
return 1;
}
#endif /* SUPPORTS_WEAK */
+#ifdef _LIBOBJC
+
+/* This is the config.h file in libobjc/ */
+#include <config.h>
+
+#ifdef HAVE_SCHED_H
+# include <sched.h>
+#endif
+
+/* Key structure for maintaining thread specific storage */
+static pthread_key_t _objc_thread_storage;
+static pthread_attr_t _objc_thread_attribs;
+
+/* Thread local storage for a single thread */
+static void *thread_local_storage = NULL;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem. */
+static inline int
+__gthread_objc_init_thread_system(void)
+{
+ if (__gthread_active_p ())
+ {
+ /* Initialize the thread storage key */
+ if (pthread_key_create(&_objc_thread_storage, NULL) == 0)
+ {
+ /* The normal default detach state for threads is
+ * PTHREAD_CREATE_JOINABLE which causes threads to not die
+ * when you think they should. */
+ if (pthread_attr_init(&_objc_thread_attribs) == 0
+ && pthread_attr_setdetachstate(&_objc_thread_attribs,
+ PTHREAD_CREATE_DETACHED) == 0)
+ return 0;
+ }
+ }
+ else
+ return -1;
+}
+
+/* Close the threads subsystem. */
+static inline int
+__gthread_objc_close_thread_system(void)
+{
+ if (__gthread_active_p ()
+ && pthread_key_delete(_objc_thread_storage) == 0
+ && pthread_attr_destroy(&_objc_thread_attribs) == 0)
+ return 0;
+
+ return -1;
+}
+
+/* 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 ( !(pthread_create(&new_thread_handle, NULL, (void *)func, arg)) )
+ thread_id = *(objc_thread_t *)&new_thread_handle;
+ else
+ thread_id = NULL;
+
+ return thread_id;
+}
+
+/* Set the current thread's priority. */
+static inline int
+__gthread_objc_thread_set_priority(int priority)
+{
+ if (!__gthread_active_p())
+ return -1;
+ else {
+ pthread_t thread_id = pthread_self();
+ int policy;
+ struct sched_param params;
+ int priority_min, priority_max;
+
+ if (pthread_getschedparam(thread_id, &policy, ¶ms) == 0)
+ {
+ if ((priority_max = sched_get_priority_max(policy)) != 0)
+ return -1;
+
+ if ((priority_min = sched_get_priority_min(policy)) != 0)
+ return -1;
+
+ if (priority > priority_max)
+ priority = priority_max;
+ else if (priority < priority_min)
+ priority = priority_min;
+ params.sched_priority = priority;
+
+ /*
+ * The solaris 7 and several other man pages incorrectly state that
+ * this should be a pointer to policy but pthread.h is universally
+ * at odds with this.
+ */
+ if (pthread_setschedparam(thread_id, policy, ¶ms) == 0)
+ return 0;
+ }
+ return -1;
+ }
+}
+
+/* Return the current thread's priority. */
+static inline int
+__gthread_objc_thread_get_priority(void)
+{
+ if (__gthread_active_p ())
+ {
+ int policy;
+ struct sched_param params;
+
+ if (pthread_getschedparam(pthread_self(), &policy, ¶ms) == 0)
+ return params.sched_priority;
+ else
+ 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 ())
+ sched_yield();
+}
+
+/* Terminate the current thread. */
+static inline int
+__gthread_objc_thread_exit(void)
+{
+ if (__gthread_active_p ())
+ /* exit the thread */
+ 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 = pthread_self();
+
+ return *(objc_thread_t *)&self;
+ }
+ else
+ return (objc_thread_t)1;
+}
+
+/* Sets the thread's local storage pointer. */
+static inline int
+__gthread_objc_thread_set_data(void *value)
+{
+ if (__gthread_active_p ())
+ return pthread_setspecific(_objc_thread_storage, value);
+ else
+ {
+ thread_local_storage = value;
+ return 0;
+ }
+}
+
+/* Returns the thread's local storage pointer. */
+static inline void *
+__gthread_objc_thread_get_data(void)
+{
+ if (__gthread_active_p ())
+ return pthread_getspecific(_objc_thread_storage);
+ else
+ return thread_local_storage;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex. */
+static inline int
+__gthread_objc_mutex_allocate(objc_mutex_t mutex)
+{
+ if (__gthread_active_p ())
+ {
+ mutex->backend = objc_malloc(sizeof(pthread_mutex_t));
+
+ if (pthread_mutex_init((pthread_mutex_t *)mutex->backend, NULL))
+ {
+ objc_free(mutex->backend);
+ mutex->backend = NULL;
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/* Deallocate a mutex. */
+static inline int
+__gthread_objc_mutex_deallocate(objc_mutex_t mutex)
+{
+ if (__gthread_active_p ())
+ {
+ int count;
+
+ /*
+ * Posix Threads specifically require that the thread be unlocked
+ * for pthread_mutex_destroy to work.
+ */
+
+ do
+ {
+ count = pthread_mutex_unlock((pthread_mutex_t *)mutex->backend);
+ if (count < 0)
+ return -1;
+ }
+ while (count);
+
+ if (pthread_mutex_destroy((pthread_mutex_t *)mutex->backend))
+ return -1;
+
+ objc_free(mutex->backend);
+ mutex->backend = NULL;
+ }
+ return 0;
+}
+
+/* Grab a lock on a mutex. */
+static inline int
+__gthread_objc_mutex_lock(objc_mutex_t mutex)
+{
+ if (__gthread_active_p ())
+ return pthread_mutex_lock((pthread_mutex_t *)mutex->backend);
+ else
+ return 0;
+}
+
+/* Try to grab a lock on a mutex. */
+static inline int
+__gthread_objc_mutex_trylock(objc_mutex_t mutex)
+{
+ if (__gthread_active_p ())
+ return pthread_mutex_trylock((pthread_mutex_t *)mutex->backend);
+ else
+ return 0;
+}
+
+/* Unlock the mutex */
+static inline int
+__gthread_objc_mutex_unlock(objc_mutex_t mutex)
+{
+ if (__gthread_active_p ())
+ return pthread_mutex_unlock((pthread_mutex_t *)mutex->backend);
+ else
+ return 0;
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition. */
static inline int
-__gthread_once (__gthread_once_t *once, void (*func) ())
+__gthread_objc_condition_allocate(objc_condition_t condition)
+{
+ if (__gthread_active_p ())
+ {
+ condition->backend = objc_malloc(sizeof(pthread_cond_t));
+
+ if (pthread_cond_init((pthread_cond_t *)condition->backend, NULL))
+ {
+ objc_free(condition->backend);
+ condition->backend = NULL;
+ return -1;
+ }
+ }
+
+ return 0;
+}
+
+/* Deallocate a condition. */
+static inline int
+__gthread_objc_condition_deallocate(objc_condition_t condition)
+{
+ if (__gthread_active_p ())
+ {
+ if (pthread_cond_destroy((pthread_cond_t *)condition->backend))
+ return -1;
+
+ objc_free(condition->backend);
+ condition->backend = NULL;
+ }
+ return 0;
+}
+
+/* Wait on the condition */
+static inline int
+__gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
+{
+ if (__gthread_active_p ())
+ return pthread_cond_wait((pthread_cond_t *)condition->backend,
+ (pthread_mutex_t *)mutex->backend);
+ else
+ return 0;
+}
+
+/* Wake up all threads waiting on this condition. */
+static inline int
+__gthread_objc_condition_broadcast(objc_condition_t condition)
+{
+ if (__gthread_active_p ())
+ return pthread_cond_broadcast((pthread_cond_t *)condition->backend);
+ else
+ return 0;
+}
+
+/* Wake up one thread waiting on this condition. */
+static inline int
+__gthread_objc_condition_signal(objc_condition_t condition)
+{
+ if (__gthread_active_p ())
+ return pthread_cond_signal((pthread_cond_t *)condition->backend);
+ else
+ return 0;
+}
+
+#else /* _LIBOBJC */
+
+static inline int
+__gthread_once (__gthread_once_t *once, void (*func) (void))
{
if (__gthread_active_p ())
return pthread_once (once, func);
return 0;
}
+#endif /* _LIBOBJC */
+
#endif /* not __gthr_posix_h */
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