[libvirt] [PATCH 1/13] Adding recursive locks

[Stefan Berger <stefanb@xxxxxxxxxx>]

This patch adds recursive locks necessary due to the processing of
network filter XML that can reference other network filters, including
references that cause looks. Loops in the XML are prevented but their
detection requires recursive locks.







---
 src/util/threads-pthread.c |   12 ++++++++++++
 src/util/threads-pthread.h |    1 +
 src/util/threads-win32.c   |    5 +++++
 src/util/threads.h         |    1 +
 4 files changed, 19 insertions(+)

Index: libvirt-acl/src/util/threads-pthread.c
===================================================================
--- libvirt-acl.orig/src/util/threads-pthread.c
+++ libvirt-acl/src/util/threads-pthread.c
@@ -43,6 +43,18 @@ int virMutexInit(virMutexPtr m)
     return 0;
 }
 
+int virRecursiveMutexInit(virMutexPtr m)
+{
+    int ret;
+    pthread_mutexattr_init(&m->attr);
+    pthread_mutexattr_settype(&m->attr, PTHREAD_MUTEX_RECURSIVE);
+    if ((ret = pthread_mutex_init(&m->lock, &m->attr)) != 0) {
+        errno = ret;
+        return -1;
+    }
+    return 0;
+}
+
 void virMutexDestroy(virMutexPtr m)
 {
     pthread_mutex_destroy(&m->lock);
Index: libvirt-acl/src/util/threads-pthread.h
===================================================================
--- libvirt-acl.orig/src/util/threads-pthread.h
+++ libvirt-acl/src/util/threads-pthread.h
@@ -24,6 +24,7 @@
 #include <pthread.h>
 
 struct virMutex {
+    pthread_mutexattr_t attr;
     pthread_mutex_t lock;
 };
 
Index: libvirt-acl/src/util/threads.h
===================================================================
--- libvirt-acl.orig/src/util/threads.h
+++ libvirt-acl/src/util/threads.h
@@ -38,6 +38,7 @@ int virThreadInitialize(void) ATTRIBUTE_
 void virThreadOnExit(void);
 
 int virMutexInit(virMutexPtr m) ATTRIBUTE_RETURN_CHECK;
+int virRecursiveMutexInit(virMutexPtr m) ATTRIBUTE_RETURN_CHECK;
 void virMutexDestroy(virMutexPtr m);
 
 void virMutexLock(virMutexPtr m);
Index: libvirt-acl/src/util/threads-win32.c
===================================================================
--- libvirt-acl.orig/src/util/threads-win32.c
+++ libvirt-acl/src/util/threads-win32.c
@@ -76,6 +76,11 @@ int virMutexInit(virMutexPtr m)
     return 0;
 }
 
+int virRecursiveMutexInit(virMutexPtr m)
+{
+    return virMutexInit(m);
+}
+
 void virMutexDestroy(virMutexPtr m)
 {
     CloseHandle(m->lock);

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