Multithreaded locking fixes.

git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@4692 c046a42c-6fe2-441c-8c8c-71466251a162

1 files changed, 16 insertions, 0 deletions

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index c0821386d9..b4ca1074b3 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -46,6 +46,22 @@ void mmap_unlock(void)
         pthread_mutex_unlock(&mmap_mutex);
     }
 }
+
+/* Grab lock to make sure things are in a consistent state after fork().  */
+void mmap_fork_start(void)
+{
+    if (mmap_lock_count)
+        abort();
+    pthread_mutex_lock(&mmap_mutex);
+}
+
+void mmap_fork_end(int child)
+{
+    if (child)
+        pthread_mutex_init(&mmap_mutex, NULL);
+    else
+        pthread_mutex_unlock(&mmap_mutex);
+}
 #else
 /* We aren't threadsafe to start with, so no need to worry about locking.  */
 void mmap_lock(void)