gcc/gthr-solaris.h

/* Threads compatibility routines for libgcc2 and libobjc.  */
/* Compile this one with gcc.  */
/* Copyright (C) 1997, 1999, 2000, 2004, 2005, 2006, 2008, 2009
   Free Software Foundation, Inc.

This file is part of GCC.

GCC 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 3, or (at your option) any later
version.

GCC 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  */

#ifndef GCC_GTHR_SOLARIS_H
#define GCC_GTHR_SOLARIS_H

/* Solaris threads as found in Solaris 2.[456].
   Actually these are Unix International (UI) threads, but I don't
   know if anyone else implements these.  */

#define __GTHREADS 1

#include <thread.h>
#include <errno.h>

#ifdef __cplusplus
#define UNUSED(x)
#else
#define UNUSED(x) x __attribute__((unused))
#endif

typedef thread_key_t __gthread_key_t;
typedef struct {
  mutex_t mutex;
  int once;
} __gthread_once_t;
typedef mutex_t __gthread_mutex_t;

typedef struct {
  long depth;
  thread_t owner;
  mutex_t actual;
} __gthread_recursive_mutex_t;

#define __GTHREAD_ONCE_INIT { DEFAULTMUTEX, 0 }
#define __GTHREAD_MUTEX_INIT DEFAULTMUTEX
#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function

#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
# define __gthrw(name) \
  static __typeof(name) __gthrw_ ## name __attribute__ ((__weakref__(#name)));
# define __gthrw_(name) __gthrw_ ## name
#else
# define __gthrw(name)
# define __gthrw_(name) name
#endif

__gthrw(thr_keycreate)
__gthrw(thr_getspecific)
__gthrw(thr_setspecific)
__gthrw(thr_create)
__gthrw(thr_self)

__gthrw(mutex_init)
__gthrw(mutex_destroy)
__gthrw(mutex_lock)
__gthrw(mutex_trylock)
__gthrw(mutex_unlock)

#ifdef _LIBOBJC
__gthrw(thr_exit)
__gthrw(thr_getprio)
__gthrw(thr_setprio)
__gthrw(thr_yield)

__gthrw(cond_init)
__gthrw(cond_destroy)
__gthrw(cond_wait)
__gthrw(cond_broadcast)
__gthrw(cond_signal)

#endif

#if SUPPORTS_WEAK && GTHREAD_USE_WEAK

/* This will not actually work in Solaris 2.5, since libc contains
   dummy symbols of all thr_* routines.  */

static inline int
__gthread_active_p (void)
{
  static void *const __gthread_active_ptr
    = __extension__ (void *) &__gthrw_(thr_create);
  return __gthread_active_ptr != 0;
}

#else /* not SUPPORTS_WEAK */

static inline int
__gthread_active_p (void)
{
  return 1;
}

#endif /* SUPPORTS_WEAK */

#ifdef _LIBOBJC

/* Key structure for maintaining thread specific storage */
static thread_key_t _objc_thread_storage;

/* 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)
{
  /* Initialize the thread storage key.  */
  if (__gthread_active_p ()
      && __gthrw_(thr_keycreate) (&_objc_thread_storage, NULL) == 0)
    return 0;

  return -1;
}

/* Close the threads subsystem.  */
static inline int
__gthread_objc_close_thread_system (void)
{
  if (__gthread_active_p ())
    return 0;
  else
    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;
  thread_t new_thread_id = 0;

  if (!__gthread_active_p ())
    return NULL;

  if (__gthrw_(thr_create) (NULL, 0, (void *) func, arg,
		  THR_DETACHED | THR_NEW_LWP,
		  &new_thread_id) == 0)
    thread_id = *(objc_thread_t *) &new_thread_id;
  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 = 300;
      break;
    default:
    case OBJC_THREAD_BACKGROUND_PRIORITY:
      sys_priority = 200;
      break;
    case OBJC_THREAD_LOW_PRIORITY:
      sys_priority = 1000;
      break;
    }

  /* Change priority */
  if (__gthrw_(thr_setprio) (__gthrw_(thr_self) (), sys_priority) == 0)
    return 0;
  else
    return -1;
}

/* Return the current thread's priority.  */
static inline int
__gthread_objc_thread_get_priority (void)
{
  int sys_priority;

  if (!__gthread_active_p ())
    return OBJC_THREAD_INTERACTIVE_PRIORITY;

  if (__gthrw_(thr_getprio) (__gthrw_(thr_self) (), &sys_priority) == 0)
    {
      if (sys_priority >= 250)
	return OBJC_THREAD_INTERACTIVE_PRIORITY;
      else if (sys_priority >= 150)
	return OBJC_THREAD_BACKGROUND_PRIORITY;
      return OBJC_THREAD_LOW_PRIORITY;
    }

  /* Couldn't get priority.  */
  return -1;
}

/* Yield our process time to another thread.  */
static inline void
__gthread_objc_thread_yield (void)
{
  if (__gthread_active_p ())
    __gthrw_(thr_yield) ();
}

/* Terminate the current thread.  */
static inline int
__gthread_objc_thread_exit (void)
{
  if (__gthread_active_p ())
    /* exit the thread */
    __gthrw_(thr_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 ())
    return (objc_thread_t) __gthrw_(thr_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 ())
    {
      if (__gthrw_(thr_setspecific) (_objc_thread_storage, value) == 0)
	return 0;
      else
	return -1;
    }
  else
    {
      thread_local_storage = value;
      return 0;
    }
}

/* Returns the thread's local storage pointer.  */
static inline void *
__gthread_objc_thread_get_data (void)
{
  void *value = NULL;

  if (__gthread_active_p ())
    {
      if (__gthrw_(thr_getspecific) (_objc_thread_storage, &value) == 0)
	return value;
      else
	return NULL;
    }
  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 ()
      && __gthrw_(mutex_init) ((mutex_t *) (&(mutex->backend)), USYNC_THREAD, 0))
    return -1;

  return 0;
}

/* Deallocate a mutex.  */
static inline int
__gthread_objc_mutex_deallocate (objc_mutex_t mutex)
{
  if (__gthread_active_p ())
    __gthrw_(mutex_destroy) ((mutex_t *) (&(mutex->backend)));

  return 0;
}

/* Grab a lock on a mutex.  */
static inline int
__gthread_objc_mutex_lock (objc_mutex_t mutex)
{
  if (__gthread_active_p ()
      && __gthrw_(mutex_lock) ((mutex_t *) (&(mutex->backend))) != 0)
    return -1;

  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 ()
      && __gthrw_(mutex_trylock) ((mutex_t *) (&(mutex->backend))) != 0)
    return -1;

  return 0;
}

/* Unlock the mutex */
static inline int
__gthread_objc_mutex_unlock (objc_mutex_t mutex)
{
  if (__gthread_active_p ()
      && __gthrw_(mutex_unlock) ((mutex_t *) (&(mutex->backend))) != 0)
    return -1;

  return 0;
}

/* Backend condition mutex functions */

/* Allocate a condition.  */
static inline int
__gthread_objc_condition_allocate (objc_condition_t condition)
{
  if (__gthread_active_p ())
    return __gthrw_(cond_init) ((cond_t *) (&(condition->backend)), USYNC_THREAD,
		      NULL);
  else
    return 0;
}

/* Deallocate a condition.  */
static inline int
__gthread_objc_condition_deallocate (objc_condition_t condition)
{
  if (__gthread_active_p ())
    return __gthrw_(cond_destroy) ((cond_t *) (&(condition->backend)));
  else
    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 __gthrw_(cond_wait) ((cond_t *) (&(condition->backend)),
		      (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 __gthrw_(cond_broadcast) ((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 __gthrw_(cond_signal) ((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 -1;

  if (__once == 0 || __func == 0)
    return EINVAL;

  if (__once->once == 0)
    {
      int __status = __gthrw_(mutex_lock) (&__once->mutex);
      if (__status != 0)
	return __status;
      if (__once->once == 0)
	{
	  (*__func) ();
	  __once->once++;
	}
      __gthrw_(mutex_unlock) (&__once->mutex);
    }
  return 0;
}

static inline int
__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
{
  /* Solaris 2.5 contains thr_* routines no-op in libc, so test if we actually
     got a reasonable key value, and if not, fail.  */
  *__key = (__gthread_key_t)-1;
  if (__gthrw_(thr_keycreate) (__key, __dtor) != 0
      || *__key == (__gthread_key_t)-1)
    return -1;
  else
    return 0;
}

static inline int
__gthread_key_delete (__gthread_key_t UNUSED (__key))
{
  /* Not possible.  */
  return -1;
}

static inline void *
__gthread_getspecific (__gthread_key_t __key)
{
  void *__ptr;
  if (__gthrw_(thr_getspecific) (__key, &__ptr) == 0)
    return __ptr;
  else
    return 0;
}

static inline int
__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
{
  return __gthrw_(thr_setspecific) (__key, (void *) __ptr);
}

static inline int
__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
{
  if (__gthread_active_p ())
    return __gthrw_(mutex_destroy) (__mutex);
  else
    return 0;
}

static inline int
__gthread_mutex_lock (__gthread_mutex_t *__mutex)
{
  if (__gthread_active_p ())
    return __gthrw_(mutex_lock) (__mutex);
  else
    return 0;
}

static inline int
__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
{
  if (__gthread_active_p ())
    return __gthrw_(mutex_trylock) (__mutex);
  else
    return 0;
}

static inline int
__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
{
  if (__gthread_active_p ())
    return __gthrw_(mutex_unlock) (__mutex);
  else
    return 0;
}

static inline int
__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
{
  __mutex->depth = 0;
  __mutex->owner = (thread_t) 0;
  return __gthrw_(mutex_init) (&__mutex->actual, USYNC_THREAD, 0);
}

static inline int
__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
{
  if (__gthread_active_p ())
    {
      thread_t __me = __gthrw_(thr_self) ();

      if (__mutex->owner != __me)
	{
	  __gthrw_(mutex_lock) (&__mutex->actual);
	  __mutex->owner = __me;
	}

      __mutex->depth++;
    }
  return 0;
}

static inline int
__gthread_recursive_mutex_trylock (__gthread_recursive_mutex_t *__mutex)
{
  if (__gthread_active_p ())
    {
      thread_t __me = __gthrw_(thr_self) ();

      if (__mutex->owner != __me)
	{
	  if (__gthrw_(mutex_trylock) (&__mutex->actual))
	    return 1;
	  __mutex->owner = __me;
	}

      __mutex->depth++;
    }
  return 0;
}

static inline int
__gthread_recursive_mutex_unlock (__gthread_recursive_mutex_t *__mutex)
{
  if (__gthread_active_p ())
    {
      if (--__mutex->depth == 0)
	{
	   __mutex->owner = (thread_t) 0;
	   __gthrw_(mutex_unlock) (&__mutex->actual);
	}
    }
  return 0;
}

#endif /* _LIBOBJC */

#undef UNUSED

#endif /* ! GCC_GTHR_SOLARIS_H */