1 files changed, 105 insertions, 0 deletions
diff --git a/lib/libthr/thread/thr_join.c b/lib/libthr/thread/thr_join.c
new file mode 100644
index 0000000..c44b261
--- /dev/null
+++ b/lib/libthr/thread/thr_join.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright (c) 1995 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.
+ *
+ * $FreeBSD$
+ */
+
+#include <errno.h>
+#include <pthread.h>
+
+#include "thr_private.h"
+
+__weak_reference(_pthread_join, pthread_join);
+
+static void backout_join(void *arg)
+{
+	struct pthread *curthread = _get_curthread();
+	struct pthread *pthread = (struct pthread *)arg;
+
+	THREAD_LIST_LOCK(curthread);
+	pthread->joiner = NULL;
+	THREAD_LIST_UNLOCK(curthread);
+}
+
+int
+_pthread_join(pthread_t pthread, void **thread_return)
+{
+	struct pthread *curthread = _get_curthread();
+	void *tmp;
+	long state;
+	int oldcancel;
+	int ret = 0;
+ 
+	if (pthread == NULL)
+		return (EINVAL);
+
+	if (pthread == curthread)
+		return (EDEADLK);
+
+	THREAD_LIST_LOCK(curthread);
+	if ((ret = _thr_find_thread(curthread, pthread, 1)) != 0) {
+		ret = ESRCH;
+	} else if ((pthread->tlflags & TLFLAGS_DETACHED) != 0) {
+		ret = ESRCH;
+	} else if (pthread->joiner != NULL) {
+		/* Multiple joiners are not supported. */
+		ret = ENOTSUP;
+	}
+	if (ret) {
+		THREAD_LIST_UNLOCK(curthread);
+		return (ret);
+	}
+	/* Set the running thread to be the joiner: */
+	pthread->joiner = curthread;
+
+	THREAD_LIST_UNLOCK(curthread);
+
+	THR_CLEANUP_PUSH(curthread, backout_join, pthread);
+	oldcancel = _thr_cancel_enter(curthread);
+
+	while ((state = pthread->state) != PS_DEAD) {
+		_thr_umtx_wait(&pthread->state, state, NULL);
+	}
+
+	_thr_cancel_leave(curthread, oldcancel);
+	THR_CLEANUP_POP(curthread, 0);
+
+	tmp = pthread->ret;
+	THREAD_LIST_LOCK(curthread);
+	pthread->tlflags |= TLFLAGS_DETACHED;
+	THR_GCLIST_ADD(pthread);
+	THREAD_LIST_UNLOCK(curthread);
+
+	if (thread_return != NULL)
+		*thread_return = tmp;
+
+	return (ret);
+}