patch-2.4.20 linux-2.4.20/include/linux/rwsem.h
Next file: linux-2.4.20/include/linux/sched.h
Previous file: linux-2.4.20/include/linux/rwsem-spinlock.h
Back to the patch index
Back to the overall index
- Lines: 47
- Date:
Thu Nov 28 15:53:15 2002
- Orig file:
linux-2.4.19/include/linux/rwsem.h
- Orig date:
Thu Nov 22 11:46:19 2001
diff -urN linux-2.4.19/include/linux/rwsem.h linux-2.4.20/include/linux/rwsem.h
@@ -2,6 +2,8 @@
*
* Written by David Howells (dhowells@redhat.com).
* Derived from asm-i386/semaphore.h
+ *
+ * Trylock by Brian Watson (Brian.J.Watson@compaq.com).
*/
#ifndef _LINUX_RWSEM_H
@@ -46,6 +48,18 @@
}
/*
+ * trylock for reading -- returns 1 if successful, 0 if contention
+ */
+static inline int down_read_trylock(struct rw_semaphore *sem)
+{
+ int ret;
+ rwsemtrace(sem,"Entering down_read_trylock");
+ ret = __down_read_trylock(sem);
+ rwsemtrace(sem,"Leaving down_read_trylock");
+ return ret;
+}
+
+/*
* lock for writing
*/
static inline void down_write(struct rw_semaphore *sem)
@@ -56,6 +70,18 @@
}
/*
+ * trylock for writing -- returns 1 if successful, 0 if contention
+ */
+static inline int down_write_trylock(struct rw_semaphore *sem)
+{
+ int ret;
+ rwsemtrace(sem,"Entering down_write_trylock");
+ ret = __down_write_trylock(sem);
+ rwsemtrace(sem,"Leaving down_write_trylock");
+ return ret;
+}
+
+/*
* release a read lock
*/
static inline void up_read(struct rw_semaphore *sem)
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)