[PATCH v4 04/23] util: expose qemu_thread_set_name

["Daniel P. Berrangé" <berrange@redhat.com>]

The ability to set the thread name needs to be used in a number
of places, so expose the current impls as public methods.

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Dr. David Alan Gilbert <dave@treblig.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
---
 include/qemu/thread.h    |  1 +
 util/qemu-thread-posix.c | 26 ++++++++++++++++----------
 util/qemu-thread-win32.c | 13 ++++++++-----
 3 files changed, 25 insertions(+), 15 deletions(-)

diff --git a/include/qemu/thread.h b/include/qemu/thread.h
index 3a286bb3ef..27b888ab0a 100644
--- a/include/qemu/thread.h
+++ b/include/qemu/thread.h
@@ -215,6 +215,7 @@ void *qemu_thread_join(QemuThread *thread);
 void qemu_thread_get_self(QemuThread *thread);
 bool qemu_thread_is_self(QemuThread *thread);
 G_NORETURN void qemu_thread_exit(void *retval);
+void qemu_thread_set_name(const char *name);
 
 struct Notifier;
 /**
diff --git a/util/qemu-thread-posix.c b/util/qemu-thread-posix.c
index 7c985b5d38..b1c127dbe3 100644
--- a/util/qemu-thread-posix.c
+++ b/util/qemu-thread-posix.c
@@ -329,6 +329,21 @@ static void qemu_thread_atexit_notify(void *arg)
     notifier_list_notify(&thread_exit, NULL);
 }
 
+void qemu_thread_set_name(const char *name)
+{
+    /*
+     * Attempt to set the threads name; note that this is for debug, so
+     * we're not going to fail if we can't set it.
+     */
+# if defined(CONFIG_PTHREAD_SETNAME_NP_W_TID)
+    pthread_setname_np(pthread_self(), name);
+# elif defined(CONFIG_PTHREAD_SETNAME_NP_WO_TID)
+    pthread_setname_np(name);
+# elif defined(CONFIG_PTHREAD_SET_NAME_NP)
+    pthread_set_name_np(pthread_self(), name);
+# endif
+}
+
 typedef struct {
     void *(*start_routine)(void *);
     void *arg;
@@ -342,17 +357,8 @@ static void *qemu_thread_start(void *args)
     void *arg = qemu_thread_args->arg;
     void *r;
 
-    /* Attempt to set the threads name; note that this is for debug, so
-     * we're not going to fail if we can't set it.
-     */
     if (qemu_thread_args->name) {
-# if defined(CONFIG_PTHREAD_SETNAME_NP_W_TID)
-        pthread_setname_np(pthread_self(), qemu_thread_args->name);
-# elif defined(CONFIG_PTHREAD_SETNAME_NP_WO_TID)
-        pthread_setname_np(qemu_thread_args->name);
-# elif defined(CONFIG_PTHREAD_SET_NAME_NP)
-        pthread_set_name_np(pthread_self(), qemu_thread_args->name);
-# endif
+        qemu_thread_set_name(qemu_thread_args->name);
     }
     QEMU_TSAN_ANNOTATE_THREAD_NAME(qemu_thread_args->name);
     g_free(qemu_thread_args->name);
diff --git a/util/qemu-thread-win32.c b/util/qemu-thread-win32.c
index 9595a5b090..4d2d663a9a 100644
--- a/util/qemu-thread-win32.c
+++ b/util/qemu-thread-win32.c
@@ -225,6 +225,7 @@ struct QemuThreadData {
     void             *arg;
     short             mode;
     NotifierList      exit;
+    char             *name;
 
     /* Only used for joinable threads. */
     bool              exited;
@@ -266,6 +267,10 @@ static unsigned __stdcall win32_start_routine(void *arg)
     void *(*start_routine)(void *) = data->start_routine;
     void *thread_arg = data->arg;
 
+    if (data->name) {
+        qemu_thread_set_name(data->name);
+        g_clear_pointer(&data->name, g_free);
+    }
     qemu_thread_data = data;
     qemu_thread_exit(start_routine(thread_arg));
     abort();
@@ -316,7 +321,7 @@ void *qemu_thread_join(QemuThread *thread)
     return ret;
 }
 
-static void set_thread_description(HANDLE h, const char *name)
+void qemu_thread_set_name(const char *name)
 {
     g_autofree wchar_t *namew = NULL;
 
@@ -329,7 +334,7 @@ static void set_thread_description(HANDLE h, const char *name)
         return;
     }
 
-    SetThreadDescriptionFunc(h, namew);
+    SetThreadDescriptionFunc(GetCurrentThread(), namew);
 }
 
 void qemu_thread_create(QemuThread *thread, const char *name,
@@ -344,6 +349,7 @@ void qemu_thread_create(QemuThread *thread, const char *name,
     data->arg = arg;
     data->mode = mode;
     data->exited = false;
+    data->name = g_strdup(name);
     notifier_list_init(&data->exit);
 
     if (data->mode != QEMU_THREAD_DETACHED) {
@@ -355,9 +361,6 @@ void qemu_thread_create(QemuThread *thread, const char *name,
     if (!hThread) {
         error_exit(GetLastError(), __func__);
     }
-    if (name) {
-        set_thread_description(hThread, name);
-    }
     CloseHandle(hThread);
 
     thread->data = data;
-- 
2.50.1