CbC/CbC_gcc: gcc/gthr-posix95.h comparison

comparison gcc/gthr-posix95.h @ 0:a06113de4d67

first commit

author	kent <kent@cr.ie.u-ryukyu.ac.jp>
date	Fri, 17 Jul 2009 14:47:48 +0900
parents
children	77e2b8dfacca

comparison

equal deleted inserted replaced

--1:000000000000
+:a06113de4d67
+/* Threads compatibility routines for libgcc2 and libobjc.  */
+/* Compile this one with gcc.  */
+/* Copyright (C) 2004, 2005, 2007, 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_POSIX_H
+#define GCC_GTHR_POSIX_H
+/* POSIX threads specific definitions.
+Easy, since the interface is just one-to-one mapping.  */
+#define __GTHREADS 1
+/* Some implementations of <pthread.h> require this to be defined.  */
+#ifndef _REENTRANT
+#define _REENTRANT 1
+#endif
+#include <pthread.h>
+#include <unistd.h>
+typedef pthread_key_t __gthread_key_t;
+typedef pthread_once_t __gthread_once_t;
+typedef pthread_mutex_t __gthread_mutex_t;
+typedef pthread_cond_t __gthread_cond_t;
+/* POSIX like conditional variables are supported.  Please look at comments
+in gthr.h for details. */
+#define __GTHREAD_HAS_COND	1
+typedef struct {
+long depth;
+pthread_t owner;
+pthread_mutex_t actual;
+} __gthread_recursive_mutex_t;
+#define __GTHREAD_MUTEX_INIT PTHREAD_MUTEX_INITIALIZER
+#define __GTHREAD_ONCE_INIT PTHREAD_ONCE_INIT
+#define __GTHREAD_RECURSIVE_MUTEX_INIT_FUNCTION __gthread_recursive_mutex_init_function
+#define __GTHREAD_COND_INIT PTHREAD_COND_INITIALIZER
+#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(pthread_once)
+__gthrw(pthread_key_create)
+__gthrw(pthread_key_delete)
+__gthrw(pthread_getspecific)
+__gthrw(pthread_setspecific)
+__gthrw(pthread_create)
+__gthrw(pthread_cancel)
+__gthrw(pthread_self)
+__gthrw(pthread_mutex_init)
+__gthrw(pthread_mutex_destroy)
+__gthrw(pthread_mutex_lock)
+__gthrw(pthread_mutex_trylock)
+__gthrw(pthread_mutex_unlock)
+__gthrw(pthread_mutexattr_init)
+__gthrw(pthread_mutexattr_destroy)
+__gthrw(pthread_cond_broadcast)
+__gthrw(pthread_cond_wait)
+#if defined(_LIBOBJC) || defined(_LIBOBJC_WEAK)
+/* Objective-C.  */
+__gthrw(pthread_cond_destroy)
+__gthrw(pthread_cond_init)
+__gthrw(pthread_cond_signal)
+__gthrw(pthread_exit)
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+__gthrw(sched_get_priority_max)
+__gthrw(sched_get_priority_min)
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+__gthrw(sched_yield)
+__gthrw(pthread_attr_destroy)
+__gthrw(pthread_attr_init)
+__gthrw(pthread_attr_setdetachstate)
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+__gthrw(pthread_getschedparam)
+__gthrw(pthread_setschedparam)
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _LIBOBJC || _LIBOBJC_WEAK */
+#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
+/* On Solaris 2.6 up to 9, the libc exposes a POSIX threads interface even if
+-pthreads is not specified.  The functions are dummies and most return an
+error value.  However pthread_once returns 0 without invoking the routine
+it is passed so we cannot pretend that the interface is active if -pthreads
+is not specified.  On Solaris 2.5.1, the interface is not exposed at all so
+we need to play the usual game with weak symbols.  On Solaris 10 and up, a
+working interface is always exposed.  On FreeBSD 6 and later, libc also
+exposes a dummy POSIX threads interface, similar to what Solaris 2.6 up
+to 9 does.  FreeBSD >= 700014 even provides a pthread_cancel stub in libc,
+which means the alternate __gthread_active_p below cannot be used there.  */
+#if defined(__FreeBSD__) || (defined(__sun) && defined(__svr4__))
+static volatile int __gthread_active = -1;
+static void
+__gthread_trigger (void)
+{
+__gthread_active = 1;
+}
+static inline int
+__gthread_active_p (void)
+{
+static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER;
+static pthread_once_t __gthread_active_once = PTHREAD_ONCE_INIT;
+/* Avoid reading __gthread_active twice on the main code path.  */
+int __gthread_active_latest_value = __gthread_active;
+/* This test is not protected to avoid taking a lock on the main code
+path so every update of __gthread_active in a threaded program must
+be atomic with regard to the result of the test.  */
+if (__builtin_expect (__gthread_active_latest_value < 0, 0))
+{
+if (__gthrw_(pthread_once))
+	{
+	  /* If this really is a threaded program, then we must ensure that
+	     __gthread_active has been set to 1 before exiting this block.  */
+	  __gthrw_(pthread_mutex_lock) (&__gthread_active_mutex);
+	  __gthrw_(pthread_once) (&__gthread_active_once, __gthread_trigger);
+	  __gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex);
+	}
+/* Make sure we'll never enter this block again.  */
+if (__gthread_active < 0)
+	__gthread_active = 0;
+__gthread_active_latest_value = __gthread_active;
+}
+return __gthread_active_latest_value != 0;
+}
+#else /* neither FreeBSD nor Solaris */
+static inline int
+__gthread_active_p (void)
+{
+static void *const __gthread_active_ptr
+= __extension__ (void *) &__gthrw_(pthread_cancel);
+return __gthread_active_ptr != 0;
+}
+#endif /* FreeBSD or Solaris */
+#else /* not SUPPORTS_WEAK */
+/* Similar to Solaris, HP-UX 11 for PA-RISC provides stubs for pthread
+calls in shared flavors of the HP-UX C library.  Most of the stubs
+have no functionality.  The details are described in the "libc cumulative
+patch" for each subversion of HP-UX 11.  There are two special interfaces
+provided for checking whether an application is linked to a pthread
+library or not.  However, these interfaces aren't available in early
+libc versions.  We also can't use pthread_once as some libc versions
+call the init function.  So, we use pthread_create to check whether it
+is possible to create a thread or not.  The stub implementation returns
+the error number ENOSYS.  */
+#if defined(__hppa__) && defined(__hpux__)
+#include <errno.h>
+static volatile int __gthread_active = -1;
+static void *
+__gthread_start (void *arg __attribute__((unused)))
+{
+return NULL;
+}
+static void __gthread_active_init (void) __attribute__((noinline));
+static void
+__gthread_active_init (void)
+{
+static pthread_mutex_t __gthread_active_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_t t;
+pthread_attr_t a;
+int result;
+__gthrw_(pthread_mutex_lock) (&__gthread_active_mutex);
+if (__gthread_active < 0)
+{
+__gthrw_(pthread_attr_init) (&a);
+__gthrw_(pthread_attr_setdetachstate) (&a, PTHREAD_CREATE_DETACHED);
+result = __gthrw_(pthread_create) (&t, &a, __gthread_start, NULL);
+if (result != ENOSYS)
+	__gthread_active = 1;
+else
+	__gthread_active = 0;
+__gthrw_(pthread_attr_destroy) (&a);
+}
+__gthrw_(pthread_mutex_unlock) (&__gthread_active_mutex);
+}
+static inline int
+__gthread_active_p (void)
+{
+/* Avoid reading __gthread_active twice on the main code path.  */
+int __gthread_active_latest_value = __gthread_active;
+/* This test is not protected to avoid taking a lock on the main code
+path so every update of __gthread_active in a threaded program must
+be atomic with regard to the result of the test.  */
+if (__builtin_expect (__gthread_active_latest_value < 0, 0))
+{
+__gthread_active_init ();
+__gthread_active_latest_value = __gthread_active;
+}
+return __gthread_active_latest_value != 0;
+}
+#else /* not hppa-hpux */
+static inline int
+__gthread_active_p (void)
+{
+return 1;
+}
+#endif /* hppa-hpux */
+#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 (__gthrw_(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 (__gthrw_(pthread_attr_init) (&_objc_thread_attribs) == 0
+	      && __gthrw_(pthread_attr_setdetachstate) (&_objc_thread_attribs,
+					      PTHREAD_CREATE_DETACHED) == 0)
+	    return 0;
+	}
+}
+return -1;
+}
+/* Close the threads subsystem.  */
+static inline int
+__gthread_objc_close_thread_system (void)
+{
+if (__gthread_active_p ()
+&& __gthrw_(pthread_key_delete) (_objc_thread_storage) == 0
+&& __gthrw_(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 (!(__gthrw_(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
+{
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+pthread_t thread_id = __gthrw_(pthread_self) ();
+int policy;
+struct sched_param params;
+int priority_min, priority_max;
+if (__gthrw_(pthread_getschedparam) (thread_id, &policy, &params) == 0)
+	{
+	  if ((priority_max = __gthrw_(sched_get_priority_max) (policy)) == -1)
+	    return -1;
+	  if ((priority_min = __gthrw_(sched_get_priority_min) (policy)) == -1)
+	    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 (__gthrw_(pthread_setschedparam) (thread_id, policy, &params) == 0)
+	    return 0;
+	}
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+return -1;
+}
+}
+/* Return the current thread's priority.  */
+static inline int
+__gthread_objc_thread_get_priority (void)
+{
+#ifdef _POSIX_PRIORITY_SCHEDULING
+#ifdef _POSIX_THREAD_PRIORITY_SCHEDULING
+if (__gthread_active_p ())
+{
+int policy;
+struct sched_param params;
+if (__gthrw_(pthread_getschedparam) (__gthrw_(pthread_self) (), &policy, &params) == 0)
+	return params.sched_priority;
+else
+	return -1;
+}
+else
+#endif /* _POSIX_THREAD_PRIORITY_SCHEDULING */
+#endif /* _POSIX_PRIORITY_SCHEDULING */
+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_(sched_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 ())
+return (objc_thread_t) __gthrw_(pthread_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 __gthrw_(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 __gthrw_(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 (__gthrw_(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 __gthrw_(pthread_mutex_destroy) to work.
+*/
+do
+	{
+	  count = __gthrw_(pthread_mutex_unlock) ((pthread_mutex_t *) mutex->backend);
+	  if (count < 0)
+	    return -1;
+	}
+while (count);
+if (__gthrw_(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 ()
+&& __gthrw_(pthread_mutex_lock) ((pthread_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_(pthread_mutex_trylock) ((pthread_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_(pthread_mutex_unlock) ((pthread_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 ())
+{
+condition->backend = objc_malloc (sizeof (pthread_cond_t));
+if (__gthrw_(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 (__gthrw_(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 __gthrw_(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 __gthrw_(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 __gthrw_(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 __gthrw_(pthread_once) (__once, __func);
+else
+return -1;
+}
+static inline int
+__gthread_key_create (__gthread_key_t *__key, void (*__dtor) (void *))
+{
+return __gthrw_(pthread_key_create) (__key, __dtor);
+}
+static inline int
+__gthread_key_delete (__gthread_key_t __key)
+{
+return __gthrw_(pthread_key_delete) (__key);
+}
+static inline void *
+__gthread_getspecific (__gthread_key_t __key)
+{
+return __gthrw_(pthread_getspecific) (__key);
+}
+static inline int
+__gthread_setspecific (__gthread_key_t __key, const void *__ptr)
+{
+return __gthrw_(pthread_setspecific) (__key, __ptr);
+}
+static inline int
+__gthread_mutex_destroy (__gthread_mutex_t *__mutex)
+{
+if (__gthread_active_p ())
+return __gthrw_(pthread_mutex_destroy) (__mutex);
+else
+return 0;
+}
+static inline int
+__gthread_mutex_lock (__gthread_mutex_t *__mutex)
+{
+if (__gthread_active_p ())
+return __gthrw_(pthread_mutex_lock) (__mutex);
+else
+return 0;
+}
+static inline int
+__gthread_mutex_trylock (__gthread_mutex_t *__mutex)
+{
+if (__gthread_active_p ())
+return __gthrw_(pthread_mutex_trylock) (__mutex);
+else
+return 0;
+}
+static inline int
+__gthread_mutex_unlock (__gthread_mutex_t *__mutex)
+{
+if (__gthread_active_p ())
+return __gthrw_(pthread_mutex_unlock) (__mutex);
+else
+return 0;
+}
+static inline int
+__gthread_recursive_mutex_init_function (__gthread_recursive_mutex_t *__mutex)
+{
+__mutex->depth = 0;
+__mutex->owner = (pthread_t) 0;
+return __gthrw_(pthread_mutex_init) (&__mutex->actual, NULL);
+}
+static inline int
+__gthread_recursive_mutex_lock (__gthread_recursive_mutex_t *__mutex)
+{
+if (__gthread_active_p ())
+{
+pthread_t __me = __gthrw_(pthread_self) ();
+if (__mutex->owner != __me)
+	{
+	  __gthrw_(pthread_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 ())
+{
+pthread_t __me = __gthrw_(pthread_self) ();
+if (__mutex->owner != __me)
+	{
+	  if (__gthrw_(pthread_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 = (pthread_t) 0;
+	   __gthrw_(pthread_mutex_unlock) (&__mutex->actual);
+	}
+}
+return 0;
+}
+static inline int
+__gthread_cond_broadcast (__gthread_cond_t *__cond)
+{
+return __gthrw_(pthread_cond_broadcast) (__cond);
+}
+static inline int
+__gthread_cond_wait (__gthread_cond_t *__cond, __gthread_mutex_t *__mutex)
+{
+return __gthrw_(pthread_cond_wait) (__cond, __mutex);
+}
+static inline int
+__gthread_cond_wait_recursive (__gthread_cond_t *__cond,
+			       __gthread_recursive_mutex_t *__mutex)
+{
+return __gthrw_(pthread_cond_wait) (__cond, &__mutex->actual);
+}
+#endif /* _LIBOBJC */
+#endif /* ! GCC_GTHR_POSIX_H */

Mercurial > hg > CbC > CbC_gcc

comparison gcc/gthr-posix95.h @ 0:a06113de4d67