experimental threaded libc - kernel only

1 files changed, 97 insertions, 0 deletions

diff --git a/lib/libpthread/uthread/uthread_find_thread.c b/lib/libpthread/uthread/uthread_find_thread.c
new file mode 100644
index 00000000000..99e302306d2
--- /dev/null
+++ b/lib/libpthread/uthread/uthread_find_thread.c
@@ -0,0 +1,97 @@
+/*
+ * 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.
+ *
+ */
+#include <errno.h>
+#ifdef _THREAD_SAFE
+#include <pthread.h>
+#include "pthread_private.h"
+
+/* Find a thread in the linked list of active threads: */
+int
+_find_thread(pthread_t pthread)
+{
+	pthread_t pthread1;
+
+	/* Check if the caller has specified an invalid thread: */
+	if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
+		/* Invalid thread: */
+		return(EINVAL);
+
+	/* Lock the thread list: */
+	_lock_thread_list();
+
+	/* Point to the first thread in the list: */
+	pthread1 = _thread_link_list;
+
+	/* Search for the thread to join to: */
+	while (pthread1 != NULL && pthread1 != pthread) {
+		/* Point to the next thread: */
+		pthread1 = pthread1->nxt;
+	}
+
+	/* Unlock the thread list: */
+	_unlock_thread_list();
+
+	/* Return zero if the thread exists: */
+	return ((pthread1 != NULL) ? 0:ESRCH);
+}
+
+/* Find a thread in the linked list of dead threads: */
+int
+_find_dead_thread(pthread_t pthread)
+{
+	pthread_t pthread1;
+
+	/* Check if the caller has specified an invalid thread: */
+	if (pthread == NULL || pthread->magic != PTHREAD_MAGIC)
+		/* Invalid thread: */
+		return(EINVAL);
+
+	/* Lock the dead thread list: */
+	_lock_dead_thread_list();
+
+	/* Point to the first thread in the list: */
+	pthread1 = _thread_dead;
+
+	/* Search for the thread to join to: */
+	while (pthread1 != NULL && pthread1 != pthread) {
+		/* Point to the next thread: */
+		pthread1 = pthread1->nxt;
+	}
+
+	/* Unlock the dead thread list: */
+	_unlock_dead_thread_list();
+
+	/* Return zero if the thread exists: */
+	return ((pthread1 != NULL) ? 0:ESRCH);
+}
+#endif