[Pvfs2-cvs] commit by kunkel in pvfs2/src/common/gen-locks: gen-locks.h gen-locks.c

[CVS commit program]

Update of /projects/cvsroot/pvfs2/src/common/gen-locks
In directory parlweb1:/tmp/cvs-serv18345/src/common/gen-locks

Modified Files:
      Tag: kunkel-migration-branch
	gen-locks.h gen-locks.c 
Log Message:
There might be a bug in the pthread implementation for our Intel Xeon SMP machine which randomly results in a server crash by the fault: pthread_mutex_lock.c:78: __pthread_mutex_lock: Assertion
`mutex->__data.__owner == 0' failed on high frequents of mutex lock  and unlock operations,
so I will use semaphores which avoids the problem.


Index: gen-locks.h
===================================================================
RCS file: /projects/cvsroot/pvfs2/src/common/gen-locks/gen-locks.h,v
diff -p -u -r1.10.42.1 -r1.10.42.2
--- gen-locks.h	17 Feb 2007 11:17:00 -0000	1.10.42.1
+++ gen-locks.h	23 Feb 2007 14:17:10 -0000	1.10.42.2
@@ -13,7 +13,7 @@
  * int gen_mutex_unlock(gen_mutex_t* mut);
  * int gen_mutex_trylock(gen_mutex_t* mut);
  * gen_mutex_t* gen_mutex_build(void);
- * int gen_mutex_destroy(gen_mutex_t* mut); 
+ * int gen_mutex_destroy(gen_mutex_t* mut);
  *
  * See the examples directory for details.
  */
@@ -25,7 +25,7 @@
 
 /* we will make posix locks the default unless turned off for now. */
 /* this is especially important for development in which case the locks
- * should really be enabled in order to verify proper operation 
+ * should really be enabled in order to verify proper operation
  */
 #if !defined(__GEN_NULL_LOCKING__) && !defined(__GEN_POSIX_LOCKING__)
 #define __GEN_POSIX_LOCKING__
@@ -33,6 +33,23 @@
 
 #ifdef __GEN_POSIX_LOCKING__
 #include <pthread.h>
+
+/* somehow I get sometimes cool messages like:
+ * pthread_mutex_lock.c  __pthread_mutex_lock: Assertion `mutex->__data.__owner == 0'
+ * now I try with semaphores
+ * */
+#include <semaphore.h>
+typedef sem_t gen_sem_t;
+
+
+int gen_posix_sem_init(
+    gen_sem_t * sem);
+int gen_posix_sem_destroy(
+    gen_sem_t * sem);
+int gen_posix_sem_lock(
+    gen_sem_t * sem);
+int gen_posix_sem_unlock(
+    gen_sem_t * sem);
 
 	/* function prototypes for specific locking implementations */
 int gen_posix_mutex_lock(

Index: gen-locks.c
===================================================================
RCS file: /projects/cvsroot/pvfs2/src/common/gen-locks/gen-locks.c,v
diff -p -u -r1.7.40.1 -r1.7.40.2
--- gen-locks.c	17 Feb 2007 11:17:00 -0000	1.7.40.1
+++ gen-locks.c	23 Feb 2007 14:17:10 -0000	1.7.40.2
@@ -19,6 +19,32 @@
  */
 
 #ifndef __GEN_NULL_LOCKING__
+
+int gen_posix_sem_destroy(
+    gen_sem_t * sem)
+{
+    return sem_destroy(sem);
+}
+
+int gen_posix_sem_init(
+    gen_sem_t * sem)
+{
+    return sem_init(sem, 0, 1);
+}
+
+
+int gen_posix_sem_lock(
+    gen_sem_t * sem)
+{
+    return sem_wait(sem);
+}
+
+int gen_posix_sem_unlock(
+    gen_sem_t * sem)
+{
+    return sem_post(sem);
+}
+
 /*
  * gen_mutex_init()
  *