1 files changed, 116 insertions, 0 deletions
diff --git a/lib/libkse/thread/thr_detach.c b/lib/libkse/thread/thr_detach.c
new file mode 100644
index 0000000..adb6861
--- /dev/null
+++ b/lib/libkse/thread/thr_detach.c
@@ -0,0 +1,116 @@
+/*
+ * 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. 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 "namespace.h"
+#include <sys/types.h>
+#include <machine/atomic.h>
+#include <errno.h>
+#include <pthread.h>
+#include "un-namespace.h"
+#include "thr_private.h"
+
+__weak_reference(_pthread_detach, pthread_detach);
+
+int
+_pthread_detach(pthread_t pthread)
+{
+	struct pthread *curthread = _get_curthread();
+	struct kse_mailbox *kmbx = NULL;
+	struct pthread *joiner;
+	int rval = 0;
+
+	/* Check for invalid calling parameters: */
+	if (pthread == NULL || pthread->magic != THR_MAGIC)
+		/* Return an invalid argument error: */
+		rval = EINVAL;
+
+	else if ((rval = _thr_ref_add(curthread, pthread,
+	    /*include dead*/1)) != 0) {
+		/* Return an error: */
+	}
+
+	/* Check if the thread is already detached: */
+	else if ((pthread->attr.flags & PTHREAD_DETACHED) != 0) {
+		/* Return an error: */
+		_thr_ref_delete(curthread, pthread);
+		rval = EINVAL;
+	} else {
+		/* Lock the detached thread: */
+		THR_SCHED_LOCK(curthread, pthread);
+
+		/* Flag the thread as detached: */
+		pthread->attr.flags |= PTHREAD_DETACHED;
+
+		/* Retrieve any joining thread and remove it: */
+		joiner = pthread->joiner;
+		if ((joiner != NULL) && (joiner->kseg == pthread->kseg)) {
+			/*
+			 * We already own the scheduler lock for the joiner.
+			 * Take advantage of that and make the joiner runnable.
+			 */
+			if (joiner->join_status.thread == pthread) {
+				/*
+				 * Set the return value for the woken thread:
+				 */
+				joiner->join_status.error = ESRCH;
+				joiner->join_status.ret = NULL;
+				joiner->join_status.thread = NULL;
+
+				kmbx = _thr_setrunnable_unlocked(joiner);
+			}
+			joiner = NULL;
+		}
+		THR_SCHED_UNLOCK(curthread, pthread);
+		/* See if there is a thread waiting in pthread_join(): */
+		if ((joiner != NULL) &&
+		    (_thr_ref_add(curthread, joiner, 0) == 0)) {
+			/* Lock the joiner before fiddling with it. */
+			THR_SCHED_LOCK(curthread, joiner);
+			if (joiner->join_status.thread == pthread) {
+				/*
+				 * Set the return value for the woken thread:
+				 */
+				joiner->join_status.error = ESRCH;
+				joiner->join_status.ret = NULL;
+				joiner->join_status.thread = NULL;
+
+				kmbx = _thr_setrunnable_unlocked(joiner);
+			}
+			THR_SCHED_UNLOCK(curthread, joiner);
+			_thr_ref_delete(curthread, joiner);
+		}
+		_thr_ref_delete(curthread, pthread);
+		if (kmbx != NULL)
+			kse_wakeup(kmbx);
+	}
+
+	/* Return the completion status: */
+	return (rval);
+}