[PATCH 1/3] util/qemu-thread-posix: use TSA_NO_TSA to suppress clang TSA warnings

[Emanuele Giuseppe Esposito]

QEMU does not compile when enabling clang's thread safety analysis
(TSA),
because some functions create wrappers for pthread mutexes but do
not use any TSA macro. Therefore the compiler fails.

In order to make the compiler happy and avoid adding all the
necessary macros to all callers (lock functions should use
TSA_ACQUIRE, while unlock TSA_RELEASE, and this applies to all
users of pthread_mutex_lock/pthread_mutex_unlock),
simply use TSA_NO_TSA to supppress such warnings.

Signed-off-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
---
 include/qemu/thread.h    | 14 +++++++++-----
 util/qemu-thread-posix.c |  2 +-
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/include/qemu/thread.h b/include/qemu/thread.h
index 7c6703bce3..81ec9fc144 100644
--- a/include/qemu/thread.h
+++ b/include/qemu/thread.h
@@ -3,6 +3,7 @@
 
 #include "qemu/processor.h"
 #include "qemu/atomic.h"
+#include "qemu/clang-tsa.h"
 
 typedef struct QemuCond QemuCond;
 typedef struct QemuSemaphore QemuSemaphore;
@@ -24,9 +25,12 @@ typedef struct QemuThread QemuThread;
 
 void qemu_mutex_init(QemuMutex *mutex);
 void qemu_mutex_destroy(QemuMutex *mutex);
-int qemu_mutex_trylock_impl(QemuMutex *mutex, const char *file, const int 
line);
-void qemu_mutex_lock_impl(QemuMutex *mutex, const char *file, const int line);
-void qemu_mutex_unlock_impl(QemuMutex *mutex, const char *file, const int 
line);
+int TSA_NO_TSA qemu_mutex_trylock_impl(QemuMutex *mutex, const char *file,
+                                       const int line);
+void TSA_NO_TSA qemu_mutex_lock_impl(QemuMutex *mutex, const char *file,
+                                     const int line);
+void TSA_NO_TSA qemu_mutex_unlock_impl(QemuMutex *mutex, const char *file,
+                                       const int line);
 
 void qemu_rec_mutex_init(QemuRecMutex *mutex);
 void qemu_rec_mutex_destroy(QemuRecMutex *mutex);
@@ -153,8 +157,8 @@ void qemu_cond_destroy(QemuCond *cond);
  */
 void qemu_cond_signal(QemuCond *cond);
 void qemu_cond_broadcast(QemuCond *cond);
-void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex,
-                         const char *file, const int line);
+void TSA_NO_TSA qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex,
+                                    const char *file, const int line);
 bool qemu_cond_timedwait_impl(QemuCond *cond, QemuMutex *mutex, int ms,
                               const char *file, const int line);
 
diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
index bae938c670..2dd1069cd3 100644
--- a/util/qemu-thread-posix.c
+++ b/util/qemu-thread-posix.c
@@ -223,7 +223,7 @@ void qemu_cond_wait_impl(QemuCond *cond, QemuMutex *mutex, 
const char *file, con
         error_exit(err, __func__);
 }
 
-static bool
+static bool TSA_NO_TSA
 qemu_cond_timedwait_ts(QemuCond *cond, QemuMutex *mutex, struct timespec *ts,
                        const char *file, const int line)
 {
-- 
2.39.0