| /* |
| * Copyright (C) 2008 The Android Open Source Project |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 |
| * COPYRIGHT OWNER 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. |
| */ |
| |
| #include <errno.h> |
| |
| #include "pthread_accessor.h" |
| |
| int pthread_join(pthread_t t, void ** ret_val) { |
| if (t == pthread_self()) { |
| return EDEADLK; |
| } |
| |
| pthread_accessor thread(t); |
| if (thread.get() == NULL) { |
| return ESRCH; |
| } |
| |
| if (thread->attr.flags & PTHREAD_ATTR_FLAG_DETACHED) { |
| return EINVAL; |
| } |
| |
| // Wait for thread death when needed. |
| |
| // If the 'join_count' is negative, this is a 'zombie' thread that |
| // is already dead and without stack/TLS. Otherwise, we need to increment 'join-count' |
| // and wait to be signaled |
| int count = thread->join_count; |
| if (count >= 0) { |
| thread->join_count += 1; |
| pthread_cond_wait(&thread->join_cond, &gThreadListLock); |
| count = --thread->join_count; |
| } |
| if (ret_val) { |
| *ret_val = thread->return_value; |
| } |
| |
| // Remove thread from thread list when we're the last joiner or when the |
| // thread was already a zombie. |
| if (count <= 0) { |
| _pthread_internal_remove_locked(thread.get()); |
| } |
| return 0; |
| } |