Import sources from 2011-03-30 iso image

1 files changed, 38 insertions, 0 deletions

diff --git a/sys/src/cmd/dossrv/lock.c b/sys/src/cmd/dossrv/lock.c
new file mode 100755
index 000000000..20d77ccd6
--- /dev/null
+++ b/sys/src/cmd/dossrv/lock.c
@@ -0,0 +1,38 @@
+#include <u.h>
+#include <libc.h>
+#include "iotrack.h"
+#include "dat.h"
+#include "fns.h"
+
+void
+mlock(MLock *l)
+{
+
+	if(l->key != 0 && l->key != 1)
+		panic("uninitialized lock");
+	if (l->key)
+		panic("lock");
+	l->key = 1;
+}
+
+void
+unmlock(MLock *l)
+{
+
+	if(l->key != 0 && l->key != 1)
+		panic("uninitialized unlock");
+	if (!l->key)
+		panic("unlock");
+	l->key = 0;
+}
+
+int
+canmlock(MLock *l)
+{
+	if(l->key != 0 && l->key != 1)
+		panic("uninitialized canlock");
+	if (l->key)
+		return 0;
+	l->key = 1;
+	return 1;
+}