1 files changed, 113 insertions, 0 deletions
diff --git a/lib/libpthread/pthreads/file.c b/lib/libpthread/pthreads/file.c
new file mode 100644
index 000000000000..d2cafc69b643
--- /dev/null
+++ b/lib/libpthread/pthreads/file.c
@@ -0,0 +1,113 @@
+/* ==== file.c ============================================================
+ * Copyright (c) 1993, 1994 by Chris Provenzano, proven@mit.edu
+ * 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 Chris Provenzano.
+ * 4. The name of Chris Provenzano may not be used to endorse or promote 
+ *	  products derived from this software without specific prior written
+ *	  permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``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 CHRIS PROVENZANO 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.
+ *
+ * Description : The locking functions for stdio.
+ *
+ *  1.00 93/09/04 proven
+ *      -Started coding this file.
+ */
+
+#include <pthread.h>
+#include <stdio.h>
+
+/* ==========================================================================
+ * flockfile()
+ */
+void flockfile(FILE *fp)
+{
+	semaphore *lock;
+	int fd;
+
+	fd = fileno(fp);
+	lock = &(fd_table[fd]->lock);
+	while (SEMAPHORE_TEST_AND_SET(lock)) {
+		pthread_yield();
+	}
+
+	if (fd_table[fd]->r_owner != pthread_run) {
+		/* This might fail but POSIX doesn't give a damn. */
+		fd_basic_lock(fd, FD_RDWR, lock);
+	}
+	fd_table[fd]->lockcount++;
+	SEMAPHORE_RESET(lock);
+}
+
+/* ==========================================================================
+ * ftrylockfile()
+ */
+int ftrylockfile(FILE *fp)
+{
+	semaphore *lock;
+	int fd;
+
+	fd = fileno(fp);
+	lock = &(fd_table[fd]->lock);
+	while (SEMAPHORE_TEST_AND_SET(lock)) {
+		pthread_yield();
+	}
+
+	if (fd_table[fd]->r_owner != pthread_run) {
+		if (!(fd_table[fd]->r_owner && fd_table[fd]->w_owner)) {
+			fd_basic_lock(fd, FD_RDWR, lock);
+			fd = OK;
+		} else {
+			fd = NOTOK;
+		}
+	} else {
+		fd_table[fd]->lockcount++;
+		fd = OK;
+	}
+	SEMAPHORE_RESET(lock);
+	return(fd);
+}
+
+/* ==========================================================================
+ * funlockfile()
+ */
+void funlockfile(FILE *fp)
+{
+	semaphore *lock;
+	int fd;
+
+	fd = fileno(fp);
+	lock = &(fd_table[fd]->lock);
+	while (SEMAPHORE_TEST_AND_SET(lock)) {
+		pthread_yield();
+	}
+
+	if (fd_table[fd]->r_owner == pthread_run) {
+		if (--fd_table[fd]->lockcount == 0) {
+			fd_basic_unlock(fd, FD_RDWR);
+		}
+	} 
+	SEMAPHORE_RESET(lock);
+}
+