[PATCH 11/15] lock: introduce global lock for device tree

[Liu Ping Fan <qemulist@xxxxxxxxx>]

From: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>

Signed-off-by: Liu Ping Fan <pingfank@xxxxxxxxxxxxxxxxxx>
---
 cpus.c      |   12 ++++++++++++
 main-loop.h |    3 +++
 2 files changed, 15 insertions(+), 0 deletions(-)

diff --git a/cpus.c b/cpus.c
index b182b3d..a734b36 100644
--- a/cpus.c
+++ b/cpus.c
@@ -611,6 +611,7 @@ static void qemu_tcg_init_cpu_signals(void)
 }
 #endif /* _WIN32 */
 
+QemuMutex qemu_device_tree_mutex;
 QemuMutex qemu_global_mutex;
 static QemuCond qemu_io_proceeded_cond;
 static bool iothread_requesting_mutex;
@@ -634,6 +635,7 @@ void qemu_init_cpu_loop(void)
     qemu_cond_init(&qemu_work_cond);
     qemu_cond_init(&qemu_io_proceeded_cond);
     qemu_mutex_init(&qemu_global_mutex);
+    qemu_mutex_init(&qemu_device_tree_mutex);
 
     qemu_thread_get_self(&io_thread);
 }
@@ -911,6 +913,16 @@ void qemu_mutex_unlock_iothread(void)
     qemu_mutex_unlock(&qemu_global_mutex);
 }
 
+void qemu_lock_devtree(void)
+{
+    qemu_mutex_lock(&qemu_device_tree_mutex);
+}
+
+void qemu_unlock_devtree(void)
+{
+    qemu_mutex_unlock(&qemu_device_tree_mutex);
+}
+
 static int all_vcpus_paused(void)
 {
     CPUArchState *penv = first_cpu;
diff --git a/main-loop.h b/main-loop.h
index dce1cd9..17e959a 100644
--- a/main-loop.h
+++ b/main-loop.h
@@ -353,6 +353,9 @@ void qemu_mutex_lock_iothread(void);
  */
 void qemu_mutex_unlock_iothread(void);
 
+void qemu_lock_devtree(void);
+void qemu_unlock_devtree(void);
+
 /* internal interfaces */
 
 void qemu_fd_register(int fd);
-- 
1.7.4.4

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