patch-2.4.4 linux/include/linux/rwsem.h

• Lines: 80
• Date: Fri Apr 27 15:48:25 2001
• Orig file: v2.4.3/linux/include/linux/rwsem.h
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.3/linux/include/linux/rwsem.h linux/include/linux/rwsem.h
@@ -0,0 +1,79 @@
+/* rwsem.h: R/W semaphores, public interface
+ *
+ * Written by David Howells (dhowells@redhat.com).
+ * Derived from asm-i386/semaphore.h
+ */
+
+#ifndef _LINUX_RWSEM_H
+#define _LINUX_RWSEM_H
+
+#include <linux/linkage.h>
+
+#define RWSEM_DEBUG 0
+
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <asm/system.h>
+#include <asm/atomic.h>
+
+struct rw_semaphore;
+
+#ifdef CONFIG_RWSEM_GENERIC_SPINLOCK
+#include <linux/rwsem-spinlock.h> /* use a generic implementation */
+#else
+#include <asm/rwsem.h> /* use an arch-specific implementation */
+#endif
+
+#ifndef rwsemtrace
+#if RWSEM_DEBUG
+extern void FASTCALL(rwsemtrace(struct rw_semaphore *sem, const char *str));
+#else
+#define rwsemtrace(SEM,FMT)
+#endif
+#endif
+
+/*
+ * lock for reading
+ */
+static inline void down_read(struct rw_semaphore *sem)
+{
+	rwsemtrace(sem,"Entering down_read");
+	__down_read(sem);
+	rwsemtrace(sem,"Leaving down_read");
+}
+
+/*
+ * lock for writing
+ */
+static inline void down_write(struct rw_semaphore *sem)
+{
+	rwsemtrace(sem,"Entering down_write");
+	__down_write(sem);
+	rwsemtrace(sem,"Leaving down_write");
+}
+
+/*
+ * release a read lock
+ */
+static inline void up_read(struct rw_semaphore *sem)
+{
+	rwsemtrace(sem,"Entering up_read");
+	__up_read(sem);
+	rwsemtrace(sem,"Leaving up_read");
+}
+
+/*
+ * release a write lock
+ */
+static inline void up_write(struct rw_semaphore *sem)
+{
+	rwsemtrace(sem,"Entering up_write");
+	__up_write(sem);
+	rwsemtrace(sem,"Leaving up_write");
+}
+
+
+#endif /* __KERNEL__ */
+#endif /* _LINUX_RWSEM_H */