481 lines
10 KiB
C
481 lines
10 KiB
C
/* Threads compatibility routines for libgcc2 and libobjc. */
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/* Compile this one with gcc. */
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/* Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* As a special exception, if you link this library with other files,
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some of which are compiled with GCC, to produce an executable,
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this library does not by itself cause the resulting executable
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to be covered by the GNU General Public License.
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This exception does not however invalidate any other reasons why
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the executable file might be covered by the GNU General Public License. */
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#ifndef GCC_GTHR_SOLARIS_H
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#define GCC_GTHR_SOLARIS_H
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/* Solaris threads as found in Solaris 2.[456].
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Actually these are Unix International (UI) threads, but I don't
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know if anyone else implements these. */
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#define __GTHREADS 1
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#include <thread.h>
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#include <errno.h>
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typedef thread_key_t __gthread_key_t;
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typedef struct
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{
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mutex_t mutex;
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int once;
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} __gthread_once_t;
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typedef mutex_t __gthread_mutex_t;
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#define __GTHREAD_ONCE_INIT { DEFAULTMUTEX, 0 }
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#define __GTHREAD_MUTEX_INIT DEFAULTMUTEX
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#if SUPPORTS_WEAK && GTHREAD_USE_WEAK
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#pragma weak thr_keycreate
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#pragma weak thr_getspecific
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#pragma weak thr_setspecific
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#pragma weak thr_create
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#pragma weak mutex_lock
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#pragma weak mutex_trylock
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#pragma weak mutex_unlock
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#ifdef _LIBOBJC
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#pragma weak thr_exit
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#pragma weak thr_keycreate
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#pragma weak thr_getprio
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#pragma weak thr_self
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#pragma weak thr_setprio
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#pragma weak thr_yield
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#pragma weak cond_init
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#pragma weak cond_destroy
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#pragma weak cond_wait
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#pragma weak cond_broadcast
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#pragma weak cond_signal
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#pragma weak mutex_init
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#pragma weak mutex_destroy
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#endif
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/* This will not actually work in Solaris 2.5, since libc contains
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dummy symbols of all thr_* routines. */
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static void *__gthread_active_ptr = (void *) &thr_create;
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static inline int
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__gthread_active_p (void)
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{
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return __gthread_active_ptr != 0;
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}
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#else /* not SUPPORTS_WEAK */
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static inline int
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__gthread_active_p (void)
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{
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return 1;
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}
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#endif /* SUPPORTS_WEAK */
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#ifdef _LIBOBJC
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/* Key structure for maintaining thread specific storage */
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static thread_key_t _objc_thread_storage;
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/* Thread local storage for a single thread */
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static void *thread_local_storage = NULL;
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/* Backend initialization functions */
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/* Initialize the threads subsystem. */
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static inline int
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__gthread_objc_init_thread_system(void)
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{
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/* Initialize the thread storage key */
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if (__gthread_active_p ()
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&& thr_keycreate(&_objc_thread_storage, NULL) == 0)
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return 0;
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return -1;
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}
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/* Close the threads subsystem. */
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static inline int
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__gthread_objc_close_thread_system(void)
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{
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if (__gthread_active_p ())
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return 0;
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else
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return -1;
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}
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/* Backend thread functions */
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/* Create a new thread of execution. */
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static inline objc_thread_t
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__gthread_objc_thread_detach(void (*func)(void *), void *arg)
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{
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objc_thread_t thread_id;
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thread_t new_thread_id = 0;
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if (!__gthread_active_p ())
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return NULL;
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if (thr_create(NULL, 0, (void *)func, arg,
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THR_DETACHED | THR_NEW_LWP,
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&new_thread_id) == 0)
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thread_id = *(objc_thread_t *)&new_thread_id;
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else
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thread_id = NULL;
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return thread_id;
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}
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/* Set the current thread's priority. */
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static inline int
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__gthread_objc_thread_set_priority(int priority)
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{
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int sys_priority = 0;
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if (!__gthread_active_p ())
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return -1;
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switch (priority)
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{
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case OBJC_THREAD_INTERACTIVE_PRIORITY:
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sys_priority = 300;
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break;
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default:
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case OBJC_THREAD_BACKGROUND_PRIORITY:
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sys_priority = 200;
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break;
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case OBJC_THREAD_LOW_PRIORITY:
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sys_priority = 1000;
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break;
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}
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/* Change priority */
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if (thr_setprio(thr_self(), sys_priority) == 0)
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return 0;
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else
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return -1;
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}
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/* Return the current thread's priority. */
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static inline int
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__gthread_objc_thread_get_priority(void)
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{
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int sys_priority;
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if (!__gthread_active_p ())
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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if (thr_getprio(thr_self(), &sys_priority) == 0)
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{
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if (sys_priority >= 250)
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return OBJC_THREAD_INTERACTIVE_PRIORITY;
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else if (sys_priority >= 150)
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return OBJC_THREAD_BACKGROUND_PRIORITY;
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return OBJC_THREAD_LOW_PRIORITY;
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}
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/* Couldn't get priority. */
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return -1;
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}
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/* Yield our process time to another thread. */
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static inline void
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__gthread_objc_thread_yield(void)
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{
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if (__gthread_active_p ())
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thr_yield();
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}
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/* Terminate the current thread. */
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static inline int
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__gthread_objc_thread_exit(void)
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{
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if (__gthread_active_p ())
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/* exit the thread */
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thr_exit(&__objc_thread_exit_status);
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/* Failed if we reached here */
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return -1;
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}
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/* Returns an integer value which uniquely describes a thread. */
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static inline objc_thread_t
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__gthread_objc_thread_id(void)
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{
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if (__gthread_active_p ())
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return (objc_thread_t)thr_self();
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else
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return (objc_thread_t)1;
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}
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/* Sets the thread's local storage pointer. */
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static inline int
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__gthread_objc_thread_set_data(void *value)
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{
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if (__gthread_active_p ())
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{
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if (thr_setspecific(_objc_thread_storage, value) == 0)
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return 0;
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else
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return -1;
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}
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else
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{
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thread_local_storage = value;
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return 0;
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}
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}
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/* Returns the thread's local storage pointer. */
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static inline void *
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__gthread_objc_thread_get_data(void)
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{
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void *value = NULL;
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if (__gthread_active_p ())
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{
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if (thr_getspecific(_objc_thread_storage, &value) == 0)
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return value;
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else
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return NULL;
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}
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else
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return thread_local_storage;
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}
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/* Backend mutex functions */
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/* Allocate a mutex. */
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static inline int
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__gthread_objc_mutex_allocate(objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& mutex_init( (mutex_t *)(&(mutex->backend)), USYNC_THREAD, 0))
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return -1;
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return 0;
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}
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/* Deallocate a mutex. */
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static inline int
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__gthread_objc_mutex_deallocate(objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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mutex_destroy((mutex_t *)(&(mutex->backend)));
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return 0;
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}
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/* Grab a lock on a mutex. */
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static inline int
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__gthread_objc_mutex_lock(objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& mutex_lock((mutex_t *)(&(mutex->backend))) != 0)
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return -1;
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return 0;
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}
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/* Try to grab a lock on a mutex. */
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static inline int
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__gthread_objc_mutex_trylock(objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& mutex_trylock((mutex_t *)(&(mutex->backend))) != 0)
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return -1;
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return 0;
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}
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/* Unlock the mutex */
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static inline int
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__gthread_objc_mutex_unlock(objc_mutex_t mutex)
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{
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if (__gthread_active_p ()
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&& mutex_unlock((mutex_t *)(&(mutex->backend))) != 0)
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return -1;
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return 0;
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}
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/* Backend condition mutex functions */
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/* Allocate a condition. */
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static inline int
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__gthread_objc_condition_allocate(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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return cond_init((cond_t *)(&(condition->backend)), USYNC_THREAD,
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NULL);
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else
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return 0;
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}
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/* Deallocate a condition. */
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static inline int
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__gthread_objc_condition_deallocate(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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return cond_destroy((cond_t *)(&(condition->backend)));
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else
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return 0;
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}
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/* Wait on the condition */
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static inline int
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__gthread_objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex)
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{
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if (__gthread_active_p ())
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return cond_wait((cond_t *)(&(condition->backend)),
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(mutex_t *)(&(mutex->backend)));
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else
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return 0;
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}
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/* Wake up all threads waiting on this condition. */
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static inline int
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__gthread_objc_condition_broadcast(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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return cond_broadcast((cond_t *)(&(condition->backend)));
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else
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return 0;
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}
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/* Wake up one thread waiting on this condition. */
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static inline int
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__gthread_objc_condition_signal(objc_condition_t condition)
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{
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if (__gthread_active_p ())
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return cond_signal((cond_t *)(&(condition->backend)));
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else
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return 0;
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}
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#else /* _LIBOBJC */
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static inline int
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__gthread_once (__gthread_once_t *once, void (*func) (void))
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{
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if (! __gthread_active_p ())
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return -1;
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if (once == 0 || func == 0)
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return EINVAL;
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if (once->once == 0)
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{
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int status = mutex_lock (&once->mutex);
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if (status != 0)
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return status;
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if (once->once == 0)
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{
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(*func) ();
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once->once ++;
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}
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mutex_unlock (&once->mutex);
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}
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return 0;
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}
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static inline int
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__gthread_key_create (__gthread_key_t *key, void (*dtor) (void *))
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{
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/* Solaris 2.5 contains thr_* routines no-op in libc, so test if we actually
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got a reasonable key value, and if not, fail. */
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*key = -1;
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if (thr_keycreate (key, dtor) != 0 || *key == -1)
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return -1;
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else
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return 0;
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}
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static inline int
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__gthread_key_dtor (__gthread_key_t key, void *ptr)
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{
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/* Nothing needed. */
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return 0;
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}
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static inline int
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__gthread_key_delete (__gthread_key_t key)
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{
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/* Not possible. */
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return -1;
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}
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static inline void *
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__gthread_getspecific (__gthread_key_t key)
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{
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void *ptr;
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if (thr_getspecific (key, &ptr) == 0)
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return ptr;
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else
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return 0;
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}
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static inline int
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__gthread_setspecific (__gthread_key_t key, const void *ptr)
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{
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return thr_setspecific (key, (void *) ptr);
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}
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static inline int
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__gthread_mutex_lock (__gthread_mutex_t *mutex)
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{
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if (__gthread_active_p ())
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return mutex_lock (mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_trylock (__gthread_mutex_t *mutex)
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{
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if (__gthread_active_p ())
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return mutex_trylock (mutex);
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else
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return 0;
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}
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static inline int
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__gthread_mutex_unlock (__gthread_mutex_t *mutex)
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{
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if (__gthread_active_p ())
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return mutex_unlock (mutex);
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else
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return 0;
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}
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#endif /* _LIBOBJC */
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#endif /* ! GCC_GTHR_SOLARIS_H */
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