[v6,2/6] Wrapper function to wait on condition for the main loop mutex

Commit Message

Aravinda Prasad March 12, 2019, 10:03 a.m. UTC

Introduce a wrapper function to wait on condition for
the main loop mutex. This function atomically releases
the main loop mutex and causes the calling thread to
block on the condition.

Signed-off-by: Aravinda Prasad <[e-mail]>
---
 cpus.c                   |    5 +++++
 include/qemu/main-loop.h |    8 ++++++++
 2 files changed, 13 insertions(+)

Patch

diff --git a/cpus.c b/cpus.c
index e83f72b..d9379e7 100644
--- a/cpus.c
+++ b/cpus.c
@@ -1858,6 +1858,11 @@  void qemu_mutex_unlock_iothread(void)
     qemu_mutex_unlock(&qemu_global_mutex);
 }
 
+void qemu_cond_wait_iothread(QemuCond *cond)
+{
+    qemu_cond_wait(cond, &qemu_global_mutex);
+}
+
 static bool all_vcpus_paused(void)
 {
     CPUState *cpu;
diff --git a/include/qemu/main-loop.h b/include/qemu/main-loop.h
index f6ba78e..a6d20b0 100644
--- a/include/qemu/main-loop.h
+++ b/include/qemu/main-loop.h
@@ -295,6 +295,14 @@  void qemu_mutex_lock_iothread_impl(const char *file, int line);
  */
 void qemu_mutex_unlock_iothread(void);
 
+/*
+ * qemu_cond_wait_iothread: Wait on condition for the main loop mutex
+ *
+ * This function atomically releases the main loop mutex and causes
+ * the calling thread to block on the condition.
+ */
+void qemu_cond_wait_iothread(QemuCond *cond);
+
 /* internal interfaces */
 
 void qemu_fd_register(int fd);