[Qemu-devel] [PATCH] Correct win32 timers deleting v.3

["Pavel Dovgaluk" <Pavel.Dovgaluk@ispras.ru>]

This patch fixes resource leaks caused by quitting qemu with exit() function on
win32 host.
Timer object should be freed not only at the end of the main function, but by
every of the application exits.

v.3: Fixed all the issues found in previous messages with patch.

Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@gmail.com>
---
 qemu-timer.c |   16 +++++++++++++---
 vl.c         |    1 -
 2 files changed, 13 insertions(+), 4 deletions(-)

diff --git a/qemu-timer.c b/qemu-timer.c
index 95814af..86d77a6 100644
--- a/qemu-timer.c
+++ b/qemu-timer.c
@@ -972,7 +972,10 @@ static int win32_start_timer(struct qemu_alarm_timer *t)
     timeGetDevCaps(&tc, sizeof(tc));
 
     data->period = tc.wPeriodMin;
-    timeBeginPeriod(data->period);
+    if (timeBeginPeriod(data->period) != TIMERR_NOERROR) {
+        fprintf(stderr, "Failed to initialize win32 alarm timer\n");
+        return -1;
+    }
 
     flags = TIME_CALLBACK_FUNCTION;
     if (alarm_has_dynticks(t))
@@ -990,6 +993,7 @@ static int win32_start_timer(struct qemu_alarm_timer *t)
         fprintf(stderr, "Failed to initialize win32 alarm timer: %ld\n",
                 GetLastError());
         timeEndPeriod(data->period);
+        data->period = 0;
         return -1;
     }
 
@@ -1000,8 +1004,12 @@ static void win32_stop_timer(struct qemu_alarm_timer *t)
 {
     struct qemu_alarm_win32 *data = t->priv;
 
-    timeKillEvent(data->timerId);
-    timeEndPeriod(data->period);
+    if (data->timerId) {
+        timeKillEvent(data->timerId);
+    }
+    if (data->period) {
+        timeEndPeriod(data->period);
+    }
 }
 
 static void win32_rearm_timer(struct qemu_alarm_timer *t)
@@ -1027,6 +1035,7 @@ static void win32_rearm_timer(struct qemu_alarm_timer *t)
                 GetLastError());
 
         timeEndPeriod(data->period);
+        data->period = 0;
         exit(1);
     }
 }
@@ -1061,6 +1070,7 @@ int init_timer_alarm(void)
     t->pending = 1;
     alarm_timer = t;
     qemu_add_vm_change_state_handler(alarm_timer_on_change_state_rearm, t);
+    atexit(quit_timers);
 
     return 0;
 
diff --git a/vl.c b/vl.c
index 0292184..c4b25b0 100644
--- a/vl.c
+++ b/vl.c
@@ -3118,7 +3118,6 @@ int main(int argc, char **argv, char **envp)
     os_setup_post();
 
     main_loop();
-    quit_timers();
     net_cleanup();
 
     return 0;