[Qemu-devel] [PATCH 13/13] simplify main loop functions

[Paolo Bonzini <pbonzini@redhat.com>]

Provide a clean example of how to use the main loop in the tools.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 cpus.c |    5 ----
 cpus.h |    1 -
 vl.c   |   79 +++++++++++++++++++++++++++++++++------------------------------
 3 files changed, 41 insertions(+), 44 deletions(-)

diff --git a/cpus.c b/cpus.c
index ead18af..b494e73 100644
--- a/cpus.c
+++ b/cpus.c
@@ -627,11 +627,6 @@ void qemu_init_cpu_loop(void)
     qemu_thread_get_self(&io_thread);
 }
 
-void qemu_main_loop_start(void)
-{
-    resume_all_vcpus();
-}
-
 void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
 {
     struct qemu_work_item wi;
diff --git a/cpus.h b/cpus.h
index 7422584..3525375 100644
--- a/cpus.h
+++ b/cpus.h
@@ -3,7 +3,6 @@
 
 /* cpus.c */
 void qemu_init_cpu_loop(void);
-void qemu_main_loop_start(void);
 void resume_all_vcpus(void);
 void pause_all_vcpus(void);
 void cpu_stop_current(void);
diff --git a/vl.c b/vl.c
index 3fa4b72..d7e1a7d 100644
--- a/vl.c
+++ b/vl.c
@@ -1430,18 +1430,49 @@ void qemu_system_vmstop_request(RunState state)
 
 qemu_irq qemu_system_powerdown;
 
+static bool main_loop_should_exit(void)
+{
+    RunState r;
+    if (qemu_debug_requested()) {
+        vm_stop(RUN_STATE_DEBUG);
+    }
+    if (qemu_shutdown_requested()) {
+        qemu_kill_report();
+        monitor_protocol_event(QEVENT_SHUTDOWN, NULL);
+        if (no_shutdown) {
+            vm_stop(RUN_STATE_SHUTDOWN);
+        } else {
+            return true;
+        }
+    }
+    if (qemu_reset_requested()) {
+        pause_all_vcpus();
+        cpu_synchronize_all_states();
+        qemu_system_reset(VMRESET_REPORT);
+        resume_all_vcpus();
+        if (runstate_check(RUN_STATE_INTERNAL_ERROR) ||
+            runstate_check(RUN_STATE_SHUTDOWN)) {
+            runstate_set(RUN_STATE_PAUSED);
+        }
+    }
+    if (qemu_powerdown_requested()) {
+        monitor_protocol_event(QEVENT_POWERDOWN, NULL);
+        qemu_irq_raise(qemu_system_powerdown);
+    }
+    if (qemu_vmstop_requested(&r)) {
+        vm_stop(r);
+    }
+    return false;
+}
+
 static void main_loop(void)
 {
     bool nonblocking;
-    int last_io __attribute__ ((unused)) = 0;
+    int last_io = 0;
 #ifdef CONFIG_PROFILER
     int64_t ti;
 #endif
-    RunState r;
-
-    qemu_main_loop_start();
-
-    for (;;) {
+    do {
         nonblocking = !kvm_enabled() && last_io > 0;
 #ifdef CONFIG_PROFILER
         ti = profile_getclock();
@@ -1450,38 +1481,7 @@ static void main_loop(void)
 #ifdef CONFIG_PROFILER
         dev_time += profile_getclock() - ti;
 #endif
-
-        if (qemu_debug_requested()) {
-            vm_stop(RUN_STATE_DEBUG);
-        }
-        if (qemu_shutdown_requested()) {
-            qemu_kill_report();
-            monitor_protocol_event(QEVENT_SHUTDOWN, NULL);
-            if (no_shutdown) {
-                vm_stop(RUN_STATE_SHUTDOWN);
-            } else
-                break;
-        }
-        if (qemu_reset_requested()) {
-            pause_all_vcpus();
-            cpu_synchronize_all_states();
-            qemu_system_reset(VMRESET_REPORT);
-            resume_all_vcpus();
-            if (runstate_check(RUN_STATE_INTERNAL_ERROR) ||
-                runstate_check(RUN_STATE_SHUTDOWN)) {
-                runstate_set(RUN_STATE_PAUSED);
-            }
-        }
-        if (qemu_powerdown_requested()) {
-            monitor_protocol_event(QEVENT_POWERDOWN, NULL);
-            qemu_irq_raise(qemu_system_powerdown);
-        }
-        if (qemu_vmstop_requested(&r)) {
-            vm_stop(r);
-        }
-    }
-    bdrv_close_all();
-    pause_all_vcpus();
+    } while (!main_loop_should_exit());
 }
 
 static void version(void)
@@ -3441,7 +3441,10 @@ int main(int argc, char **argv, char **envp)
 
     os_setup_post();
 
+    resume_all_vcpus();
     main_loop();
+    bdrv_close_all();
+    pause_all_vcpus();
     net_cleanup();
     res_free();
 
-- 
1.7.6