1998-09-21 Ben Elliston <bje@cygnus.com>

* New directory.  Moved files from ../gcc/objc.

From-SVN: r22514

libobjc/thr-pthreads.c

@@ -0,0 +1,218 @@
+/* GNU Objective C Runtime Thread Implementation for PCThreads under GNU/Linux.
+   Copyright (C) 1996, 1997 Free Software Foundation, Inc.
+   Contributed by Scott Christley <scottc@net-community.com>
+   Condition functions added by: Mircea Oancea <mircea@first.elcom.pub.ro>
+
+This file is part of GNU CC.
+
+GNU CC is free software; you can redistribute it and/or modify it under the
+terms of the GNU General Public License as published by the Free Software
+Foundation; either version 2, or (at your option) any later version.
+
+GNU CC is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
+details.
+
+You should have received a copy of the GNU General Public License
+along with GNU CC; see the file COPYING.  If not, write to
+the Free Software Foundation, 59 Temple Place - Suite 330,
+Boston, MA 02111-1307, USA.  */
+
+/* As a special exception, if you link this library with files compiled with
+   GCC to produce an executable, this does not cause the resulting executable
+   to be covered by the GNU General Public License. This exception does not
+   however invalidate any other reasons why the executable file might be
+   covered by the GNU General Public License.  */
+
+#include <pcthread.h>
+#include <objc/thr.h>
+#include "runtime.h"
+
+/* Key structure for maintaining thread specific storage */
+static pthread_key_t _objc_thread_storage;
+
+/* Backend initialization functions */
+
+/* Initialize the threads subsystem. */
+int
+__objc_init_thread_system(void)
+{
+  /* Initialize the thread storage key */
+  return pthread_key_create(&_objc_thread_storage, NULL);
+}
+
+/* Close the threads subsystem. */
+int
+__objc_close_thread_system(void)
+{
+  /* Destroy the thread storage key */
+  /* Not implemented yet */
+  /* return pthread_key_delete(&_objc_thread_storage); */
+  return 0;
+}
+
+/* Backend thread functions */
+
+/* Create a new thread of execution. */
+objc_thread_t
+__objc_thread_detach(void (*func)(void *arg), void *arg)
+{
+  objc_thread_t thread_id;
+  pthread_t new_thread_handle;
+
+  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. */
+int
+__objc_thread_set_priority(int priority)
+{
+  /* Not implemented yet */
+  return -1;
+}
+
+/* Return the current thread's priority. */
+int
+__objc_thread_get_priority(void)
+{
+  /* Not implemented yet */
+  return OBJC_THREAD_INTERACTIVE_PRIORITY;
+}
+
+/* Yield our process time to another thread. */
+void
+__objc_thread_yield(void)
+{
+  pthread_yield(NULL);
+}
+
+/* Terminate the current thread. */
+int
+__objc_thread_exit(void)
+{
+  /* 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. */
+objc_thread_t
+__objc_thread_id(void)
+{
+  pthread_t self = pthread_self();
+
+  return *(objc_thread_t *)&self;
+}
+
+/* Sets the thread's local storage pointer. */
+int
+__objc_thread_set_data(void *value)
+{
+  return pthread_setspecific(_objc_thread_storage, value);
+}
+
+/* Returns the thread's local storage pointer. */
+void *
+__objc_thread_get_data(void)
+{
+  void *value = NULL;
+
+  if ( !(pthread_getspecific(_objc_thread_storage, &value)) )
+    return value;
+
+  return NULL;
+}
+
+/* Backend mutex functions */
+
+/* Allocate a mutex. */
+int
+__objc_mutex_allocate(objc_mutex_t mutex)
+{
+  if (pthread_mutex_init((pthread_mutex_t *)(&(mutex->backend)), NULL))
+    return -1;
+  else
+    return 0;
+}
+
+/* Deallocate a mutex. */
+int
+__objc_mutex_deallocate(objc_mutex_t mutex)
+{
+  if (pthread_mutex_destroy((pthread_mutex_t *)(&(mutex->backend))))
+    return -1;
+  else
+    return 0;
+}
+
+/* Grab a lock on a mutex. */
+int
+__objc_mutex_lock(objc_mutex_t mutex)
+{
+  return pthread_mutex_lock((pthread_mutex_t *)(&(mutex->backend)));
+}
+
+/* Try to grab a lock on a mutex. */
+int
+__objc_mutex_trylock(objc_mutex_t mutex)
+{
+  return pthread_mutex_trylock((pthread_mutex_t *)(&(mutex->backend)));
+}
+
+/* Unlock the mutex */
+int
+__objc_mutex_unlock(objc_mutex_t mutex)
+{
+  return pthread_mutex_unlock((pthread_mutex_t *)(&(mutex->backend)));
+}
+
+/* Backend condition mutex functions */
+
+/* Allocate a condition. */
+int
+__objc_condition_allocate(objc_condition_t condition)
+{
+  if (pthread_cond_init((pthread_cond_t *)(&(condition->backend)), NULL))
+    return -1;
+  else
+    return 0;
+}
+
+/* Deallocate a condition. */
+int
+__objc_condition_deallocate(objc_condition_t condition)
+{
+  return pthread_cond_destroy((pthread_cond_t *)(&(condition->backend)));
+}
+
+/* Wait on the condition */
+int
+__objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
+{
+  return pthread_cond_wait((pthread_cond_t *)(&(condition->backend)),
+			   (pthread_mutex_t *)(&(mutex->backend)));
+}
+
+/* Wake up all threads waiting on this condition. */
+int
+__objc_condition_broadcast(objc_condition_t condition)
+{
+  return pthread_cond_broadcast((pthread_cond_t *)(&(condition->backend)));
+}
+
+/* Wake up one thread waiting on this condition. */
+int
+__objc_condition_signal(objc_condition_t condition)
+{
+  return pthread_cond_signal((pthread_cond_t *)(&(condition->backend)));
+}
+
+/* End of File */