diff options
Diffstat (limited to 'lib/libthr/thread/thr_gc.c')
| -rw-r--r-- | lib/libthr/thread/thr_gc.c | 203 |
1 files changed, 0 insertions, 203 deletions
diff --git a/lib/libthr/thread/thr_gc.c b/lib/libthr/thread/thr_gc.c deleted file mode 100644 index 1f6bc6b..0000000 --- a/lib/libthr/thread/thr_gc.c +++ /dev/null @@ -1,203 +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 AUTHOR 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. - * - * $FreeBSD$ - * - * Garbage collector thread. Frees memory allocated for dead threads. - * - */ -#include <sys/param.h> -#include <errno.h> -#include <time.h> -#include <stdlib.h> -#include <unistd.h> -#include <sys/types.h> -#include <pthread.h> -#include "thr_private.h" - -pthread_addr_t -_thread_gc(pthread_addr_t arg) -{ - int f_debug; - int f_done = 0; - int ret; - sigset_t mask; - pthread_t pthread; - pthread_t pthread_cln; - struct timespec abstime; - void *p_stack; - - /* Block all signals */ - sigfillset(&mask); - pthread_sigmask(SIG_BLOCK, &mask, NULL); - - /* Mark this thread as a library thread (not a user thread). */ - curthread->flags |= PTHREAD_FLAGS_PRIVATE; - - /* 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(curthread,"GC"); - - while (!f_done) { - /* Check if debugging this application. */ - if (f_debug) - /* Dump thread info to file. */ - _thread_dump_info(); - - /* - * Lock the list of dead threads which ensures that - * this thread sees another thread exit: - */ - DEAD_LIST_LOCK; - - /* No stack or thread structure to free yet. */ - p_stack = NULL; - pthread_cln = NULL; - - /* Check if this is the last running thread. */ - THREAD_LIST_LOCK; - if (TAILQ_FIRST(&_thread_list) == curthread && - TAILQ_NEXT(curthread, tle) == NULL) - /* - * This is the last thread, so it can exit - * now. - */ - f_done = 1; - THREAD_LIST_UNLOCK; - - /* - * Enter a loop to search for the first dead thread that - * has memory to free. - */ - for (pthread = TAILQ_FIRST(&_dead_list); - p_stack == NULL && pthread_cln == NULL && pthread != NULL; - pthread = TAILQ_NEXT(pthread, dle)) { - /* Don't destroy the initial thread. */ - if (pthread == _thread_initial) - continue; - - UMTX_LOCK(&pthread->lock); - - /* - * Check if the stack was not specified by - * the caller to pthread_create() and has not - * been destroyed yet: - */ - STACK_LOCK; - if (pthread->attr.stackaddr_attr == NULL && - pthread->stack != NULL) { - _thread_stack_free(pthread->stack, - pthread->attr.stacksize_attr, - pthread->attr.guardsize_attr); - pthread->stack = NULL; - } - STACK_UNLOCK; - - /* - * If the thread has not been detached, leave - * it on the dead thread list. - */ - if ((pthread->attr.flags & PTHREAD_DETACHED) == 0) { - UMTX_UNLOCK(&pthread->lock); - continue; - } - - /* Remove this thread from the dead list: */ - TAILQ_REMOVE(&_dead_list, pthread, dle); - - /* - * Point to the thread structure that must - * be freed outside the locks: - */ - pthread_cln = pthread; - - UMTX_UNLOCK(&pthread->lock); - - /* - * Retire the architecture specific id so it may be - * used for new threads. - */ - _retire_thread(pthread_cln->arch_id); - - } - - /* - * 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, - &dead_list_lock, &abstime)) != 0 && ret != ETIMEDOUT) { - _thread_printf(STDERR_FILENO, "ret = %d", ret); - PANIC("gc cannot wait for a signal"); - } - } - - /* Unlock the garbage collector mutex: */ - DEAD_LIST_UNLOCK; - - /* - * 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) { - if (pthread_cln->name != NULL) { - /* Free the thread name string. */ - free(pthread_cln->name); - } - /* - * Free the memory allocated for the thread - * structure. - */ - free(pthread_cln); - } - } - return (NULL); -} |
