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Diffstat (limited to 'lib/libpthread/thread/thr_gc.c')
| -rw-r--r-- | lib/libpthread/thread/thr_gc.c | 272 |
1 files changed, 0 insertions, 272 deletions
diff --git a/lib/libpthread/thread/thr_gc.c b/lib/libpthread/thread/thr_gc.c deleted file mode 100644 index f297fa8a4953..000000000000 --- a/lib/libpthread/thread/thr_gc.c +++ /dev/null @@ -1,272 +0,0 @@ -/* - * Copyright (c) 1998 John Birrell <jb@cimlogic.com.au> - * All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by John Birrell. - * 4. Neither the name of the author nor the names of any co-contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY JOHN BIRRELL AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - * - * $Id: uthread_gc.c,v 1.1 1998/09/30 06:36:56 jb Exp $ - * - * Garbage collector thread. Frees memory allocated for dead threads. - * - */ -#include <errno.h> -#include <time.h> -#include <unistd.h> -#include <sys/types.h> -#include <pthread.h> -#include "pthread_private.h" - -pthread_addr_t -_thread_gc(pthread_addr_t arg) -{ - int f_debug; - int f_done = 0; - int ret; - pthread_t pthread; - pthread_t pthread_cln; - pthread_t pthread_nxt; - pthread_t pthread_prv; - struct timespec abstime; - void *p_stack; - - /* Set a debug flag based on an environment variable. */ - f_debug = (getenv("LIBC_R_DEBUG") != NULL); - - /* Set the name of this thread. */ - pthread_set_name_np(_thread_run,"GC"); - - while (!f_done) { - /* Check if debugging this application. */ - if (f_debug) - /* Dump thread info to file. */ - _thread_dump_info(); - - /* Lock the thread list: */ - _lock_thread_list(); - - /* Check if this is the last running thread: */ - if (_thread_link_list == _thread_run && - _thread_link_list->nxt == NULL) - /* - * This is the last thread, so it can exit - * now. - */ - f_done = 1; - - /* Unlock the thread list: */ - _unlock_thread_list(); - - /* - * Lock the garbage collector mutex which ensures that - * this thread sees another thread exit: - */ - if (pthread_mutex_lock(&_gc_mutex) != 0) - PANIC("Cannot lock gc mutex"); - - /* No stack of thread structure to free yet: */ - p_stack = NULL; - pthread_cln = NULL; - - /* Point to the first dead thread (if there are any): */ - pthread = _thread_dead; - - /* There is no previous dead thread: */ - pthread_prv = NULL; - - /* - * Enter a loop to search for the first dead thread that - * has memory to free. - */ - while (p_stack == NULL && pthread_cln == NULL && - pthread != NULL) { - /* Save a pointer to the next thread: */ - pthread_nxt = pthread->nxt_dead; - - /* Check if the initial thread: */ - if (pthread == _thread_initial) - /* Don't destroy the initial thread. */ - pthread_prv = pthread; - - /* - * Check if this thread has detached: - */ - else if ((pthread->attr.flags & - PTHREAD_DETACHED) != 0) { - /* - * Check if there is no previous dead - * thread: - */ - if (pthread_prv == NULL) - /* - * The dead thread is at the head - * of the list: - */ - _thread_dead = pthread_nxt; - else - /* - * The dead thread is not at the - * head of the list: - */ - pthread_prv->nxt_dead = - pthread->nxt_dead; - - /* - * Check if the stack was not specified by - * the caller to pthread_create and has not - * been destroyed yet: - */ - if (pthread->attr.stackaddr_attr == NULL && - pthread->stack != NULL) { - /* - * Point to the stack that must - * be freed outside the locks: - */ - p_stack = pthread->stack; - } - - /* - * Point to the thread structure that must - * be freed outside the locks: - */ - pthread_cln = pthread; - } else { - /* - * This thread has not detached, so do - * not destroy it: - */ - pthread_prv = pthread; - - /* - * Check if the stack was not specified by - * the caller to pthread_create and has not - * been destroyed yet: - */ - if (pthread->attr.stackaddr_attr == NULL && - pthread->stack != NULL) { - /* - * Point to the stack that must - * be freed outside the locks: - */ - p_stack = pthread->stack; - - /* - * NULL the stack pointer now - * that the memory has been freed: - */ - pthread->stack = NULL; - } - } - - /* Point to the next thread: */ - pthread = pthread_nxt; - } - - /* - * Check if this is not the last thread and there is no - * memory to free this time around. - */ - if (!f_done && p_stack == NULL && pthread_cln == NULL) { - /* Get the current time. */ - if (clock_gettime(CLOCK_REALTIME,&abstime) != 0) - PANIC("gc cannot get time"); - - /* - * Do a backup poll in 10 seconds if no threads - * die before then. - */ - abstime.tv_sec += 10; - - /* - * Wait for a signal from a dying thread or a - * timeout (for a backup poll). - */ - if ((ret = pthread_cond_timedwait(&_gc_cond, - &_gc_mutex, &abstime)) != 0 && ret != ETIMEDOUT) - PANIC("gc cannot wait for a signal"); - } - - /* Unlock the garbage collector mutex: */ - if (pthread_mutex_unlock(&_gc_mutex) != 0) - PANIC("Cannot unlock gc mutex"); - - /* - * If there is memory to free, do it now. The call to - * free() might block, so this must be done outside the - * locks. - */ - if (p_stack != NULL) - free(p_stack); - if (pthread_cln != NULL) { - /* Lock the thread list: */ - _lock_thread_list(); - - /* - * Check if the thread is at the head of the - * linked list. - */ - if (_thread_link_list == pthread_cln) - /* There is no previous thread: */ - _thread_link_list = pthread_cln->nxt; - else { - /* Point to the first thread in the list: */ - pthread = _thread_link_list; - - /* - * Enter a loop to find the thread in the - * linked list before the thread that is - * about to be freed. - */ - while (pthread != NULL && - pthread->nxt != pthread_cln) - /* Point to the next thread: */ - pthread = pthread->nxt; - - /* Check that a previous thread was found: */ - if (pthread != NULL) { - /* - * Point the previous thread to - * the one after the thread being - * freed: - */ - pthread->nxt = pthread_cln->nxt; - } - } - - /* Unlock the thread list: */ - _unlock_thread_list(); - - /* - * Free the memory allocated for the thread - * structure. - */ - free(pthread_cln); - } - - } - return (NULL); -} |