[PATCH 01/10] util/qemu-thread: track bql_locked across the timed condvar wait

["Denis V. Lunev" <den@openvz.org>]

From: Denis V. Lunev <den@openvz.org>

qemu_cond_timedwait_ts() releases and retakes the mutex around
pthread_cond_timedwait(), but calls the two trace points by hand
instead of going through the mutex hooks, so it never reaches
bql_update_status(). A thread waiting there still reports bql_locked
true while the mutex is released, which is the confusion the hooks were
given that job to end. migration/cpu-throttle.c reaches this through
qemu_cond_timedwait_bql(). The Windows qemu_cond_timedwait_impl() has
the same two trace calls, next to a qemu_cond_wait_impl() that already
uses the hooks.

Call the hooks, which emit the same two trace points.

Fixes: c89d1c879a ("bql: Fix bql_locked status with condvar APIs")
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Philippe Mathieu-Daudé <philmd@oss.qualcomm.com>
Cc: Zhao Liu <zhao1.liu@intel.com>
Cc: Stefan Weil <sw@weilnetz.de>
Signed-off-by: Denis V. Lunev <den@openvz.org>
---
 util/qemu-thread-posix.c | 4 ++--
 util/qemu-thread-win32.c | 4 ++--
 2 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
index 089606c93f..580cdf8079 100644
--- a/util/qemu-thread-posix.c
+++ b/util/qemu-thread-posix.c
@@ -250,9 +250,9 @@ qemu_cond_timedwait_ts(QemuCond *cond, QemuMutex *mutex, struct timespec *ts,
     int err;
 
     assert(cond->initialized);
-    trace_qemu_mutex_unlock(mutex, file, line);
+    qemu_mutex_pre_unlock(mutex, file, line);
     err = pthread_cond_timedwait(&cond->cond, &mutex->lock, ts);
-    trace_qemu_mutex_locked(mutex, file, line);
+    qemu_mutex_post_lock(mutex, file, line);
     if (err && err != ETIMEDOUT) {
         error_exit(err, __func__);
     }
diff --git a/util/qemu-thread-win32.c b/util/qemu-thread-win32.c
index 3037732a6f..afdacdb5f2 100644
--- a/util/qemu-thread-win32.c
+++ b/util/qemu-thread-win32.c
@@ -177,11 +177,11 @@ bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms,
     int rc = 0;
 
     assert(cond->initialized);
-    trace_qemu_mutex_unlock(mutex, file, line);
+    qemu_mutex_pre_unlock(mutex, file, line);
     if (!SleepConditionVariableSRW(&cond->var, &mutex->lock, ms, 0)) {
         rc = GetLastError();
     }
-    trace_qemu_mutex_locked(mutex, file, line);
+    qemu_mutex_post_lock(mutex, file, line);
     if (rc && rc != ERROR_TIMEOUT) {
         error_exit(rc, __func__);
     }
-- 
2.53.0