/* GNU Objective C Runtime Thread Interface for POSIX compliant threads Copyright (C) 1996, 1997, 2009 Free Software Foundation, Inc. Contributed by Galen C. Hunt (gchunt@cs.rochester.edu) Modified for Linux/Pthreads by Kai-Uwe Sattler (kus@iti.cs.uni-magdeburg.de) Modified for posix compliance by Chris Ball (cball@fmco.com) 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/>. */ #include "objc/thr.h" #include "objc/runtime.h" #include <pthread.h> /* Key structure for maintaining thread specific storage */ static pthread_key_t _objc_thread_storage; static pthread_attr_t _objc_thread_attribs; /* Backend initialization functions */ /* Initialize the threads subsystem. */ int __objc_init_thread_system(void) { /* 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) { if (pthread_attr_setdetachstate(&_objc_thread_attribs, PTHREAD_CREATE_DETACHED) == 0) return 0; } } return -1; } /* Close the threads subsystem. */ int __objc_close_thread_system(void) { if (pthread_key_delete(_objc_thread_storage) == 0) { if (pthread_attr_destroy(&_objc_thread_attribs) == 0) return 0; } return -1; } /* 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, &_objc_thread_attribs, (void *)func, arg))) thread_id = *(objc_thread_t *)&new_thread_handle; else thread_id = NULL; return thread_id; } /* Set the current thread's priority. * * Be aware that the default schedpolicy often disallows thread priorities. */ int __objc_thread_set_priority(int priority) { 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. */ int __objc_thread_get_priority(void) { int policy; struct sched_param params; if (pthread_getschedparam(pthread_self(), &policy, ¶ms) == 0) return params.sched_priority; else return -1; } /* Yield our process time to another thread. */ void __objc_thread_yield(void) { sched_yield(); } /* 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) { if (pthread_setspecific(_objc_thread_storage, value) == 0) return 0; else return -1; } /* Returns the thread's local storage pointer. */ void * __objc_thread_get_data(void) { return pthread_getspecific(_objc_thread_storage); } /* Backend mutex functions */ /* Allocate a mutex. */ int __objc_mutex_allocate(objc_mutex_t mutex) { 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. */ int __objc_mutex_deallocate(objc_mutex_t mutex) { int count = 1; /* * Posix Threads specifically require that the thread be unlocked for * pthread_mutex_destroy to work. */ while (count) { if ((count = pthread_mutex_unlock((pthread_mutex_t*)mutex->backend)) < 0) return -1; } 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. */ int __objc_mutex_lock(objc_mutex_t mutex) { if (pthread_mutex_lock((pthread_mutex_t *)mutex->backend) == 0) return 0; else return -1; } /* Try to grab a lock on a mutex. */ int __objc_mutex_trylock(objc_mutex_t mutex) { if (pthread_mutex_trylock((pthread_mutex_t *)mutex->backend) == 0) return 0; else return -1; } /* Unlock the mutex */ int __objc_mutex_unlock(objc_mutex_t mutex) { if (pthread_mutex_unlock((pthread_mutex_t *)mutex->backend) == 0) return 0; else return -1; } /* Backend condition mutex functions */ /* Allocate a condition. */ int __objc_condition_allocate(objc_condition_t condition) { 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. */ int __objc_condition_deallocate(objc_condition_t condition) { if (pthread_cond_destroy((pthread_cond_t *)condition->backend)) return -1; objc_free(condition->backend); condition->backend = NULL; return 0; } /* Wait on the condition */ int __objc_condition_wait(objc_condition_t condition, objc_mutex_t mutex) { if (pthread_cond_wait((pthread_cond_t *)condition->backend, (pthread_mutex_t *)mutex->backend) == 0) return 0; else return -1; } /* Wake up all threads waiting on this condition. */ int __objc_condition_broadcast(objc_condition_t condition) { if (pthread_cond_broadcast((pthread_cond_t *)condition->backend) == 0) return 0; else return -1; } /* Wake up one thread waiting on this condition. */ int __objc_condition_signal(objc_condition_t condition) { if (pthread_cond_signal((pthread_cond_t *)condition->backend) == 0) return 0; else return -1; }