Refactor thread retrieval and check

We have qemu_cpu_self and qemu_thread_self. The latter is retrieving the
current thread, the former is checking for equality (using CPUState). We
also have qemu_thread_equal which is only used like qemu_cpu_self.

This refactors the interfaces, creating qemu_cpu_is_self and
qemu_thread_is_self as well ass qemu_thread_get_self.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Blue Swirl <blauwirbel@gmail.com>

cpus.c

@@ -531,7 +531,7 @@ void qemu_init_vcpu(void *_env)
     }
 }
 
-int qemu_cpu_self(void *env)
+int qemu_cpu_is_self(void *env)
 {
     return 1;
 }
@@ -699,7 +699,7 @@ int qemu_init_main_loop(void)
     qemu_mutex_init(&qemu_global_mutex);
     qemu_mutex_lock(&qemu_global_mutex);
 
-    qemu_thread_self(&io_thread);
+    qemu_thread_get_self(&io_thread);
 
     return 0;
 }
@@ -714,7 +714,7 @@ void run_on_cpu(CPUState *env, void (*func)(void *data), void *data)
 {
     struct qemu_work_item wi;
 
-    if (qemu_cpu_self(env)) {
+    if (qemu_cpu_is_self(env)) {
         func(data);
         return;
     }
@@ -808,7 +808,7 @@ static void *qemu_kvm_cpu_thread_fn(void *arg)
     int r;
 
     qemu_mutex_lock(&qemu_global_mutex);
-    qemu_thread_self(env->thread);
+    qemu_thread_get_self(env->thread);
 
     r = kvm_init_vcpu(env);
     if (r < 0) {
@@ -845,7 +845,7 @@ static void *qemu_tcg_cpu_thread_fn(void *arg)
     CPUState *env = arg;
 
     qemu_tcg_init_cpu_signals();
-    qemu_thread_self(env->thread);
+    qemu_thread_get_self(env->thread);
 
     /* signal CPU creation */
     qemu_mutex_lock(&qemu_global_mutex);
@@ -888,14 +888,11 @@ void qemu_cpu_kick_self(void)
     }
 }
 
-int qemu_cpu_self(void *_env)
+int qemu_cpu_is_self(void *_env)
 {
     CPUState *env = _env;
-    QemuThread this;
 
-    qemu_thread_self(&this);
+    return qemu_thread_is_self(env->thread);
-
-    return qemu_thread_equal(&this, env->thread);
 }
 
 void qemu_mutex_lock_iothread(void)
@@ -1023,10 +1020,7 @@ void cpu_stop_current(void)
 
 void vm_stop(int reason)
 {
-    QemuThread me;
+    if (!qemu_thread_is_self(&io_thread)) {
-    qemu_thread_self(&me);
-
-    if (!qemu_thread_equal(&me, &io_thread)) {
         qemu_system_vmstop_request(reason);
         /*
          * FIXME: should not return to device code in case

exec.c

@@ -1640,7 +1640,7 @@ void cpu_interrupt(CPUState *env, int mask)
      * If called from iothread context, wake the target cpu in
      * case its halted.
      */
-    if (!qemu_cpu_self(env)) {
+    if (!qemu_cpu_is_self(env)) {
         qemu_cpu_kick(env);
         return;
     }

qemu-common.h

@@ -290,7 +290,7 @@ void qemu_notify_event(void);
 /* Unblock cpu */
 void qemu_cpu_kick(void *env);
 void qemu_cpu_kick_self(void);
-int qemu_cpu_self(void *env);
+int qemu_cpu_is_self(void *env);
 
 /* work queue */
 struct qemu_work_item {

qemu-thread.c

@@ -176,14 +176,14 @@ void qemu_thread_signal(QemuThread *thread, int sig)
         error_exit(err, __func__);
 }
 
-void qemu_thread_self(QemuThread *thread)
+void qemu_thread_get_self(QemuThread *thread)
 {
     thread->thread = pthread_self();
 }
 
-int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2)
+int qemu_thread_is_self(QemuThread *thread)
 {
-   return pthread_equal(thread1->thread, thread2->thread);
+   return pthread_equal(pthread_self(), thread->thread);
 }
 
 void qemu_thread_exit(void *retval)

qemu-thread.h

@@ -37,8 +37,8 @@ void qemu_thread_create(QemuThread *thread,
                        void *(*start_routine)(void*),
                        void *arg);
 void qemu_thread_signal(QemuThread *thread, int sig);
-void qemu_thread_self(QemuThread *thread);
+void qemu_thread_get_self(QemuThread *thread);
-int qemu_thread_equal(QemuThread *thread1, QemuThread *thread2);
+int qemu_thread_is_self(QemuThread *thread);
 void qemu_thread_exit(void *retval);
 
 #endif

target-i386/kvm.c

@@ -1355,7 +1355,7 @@ int kvm_arch_put_registers(CPUState *env, int level)
 {
     int ret;
 
-    assert(cpu_is_stopped(env) || qemu_cpu_self(env));
+    assert(cpu_is_stopped(env) || qemu_cpu_is_self(env));
 
     ret = kvm_getput_regs(env, 1);
     if (ret < 0) {
@@ -1403,7 +1403,7 @@ int kvm_arch_get_registers(CPUState *env)
 {
     int ret;
 
-    assert(cpu_is_stopped(env) || qemu_cpu_self(env));
+    assert(cpu_is_stopped(env) || qemu_cpu_is_self(env));
 
     ret = kvm_getput_regs(env, 0);
     if (ret < 0) {

ui/vnc-jobs-async.c

@@ -303,7 +303,7 @@ static void *vnc_worker_thread(void *arg)
 {
     VncJobQueue *queue = arg;
 
-    qemu_thread_self(&queue->thread);
+    qemu_thread_get_self(&queue->thread);
 
     while (!vnc_worker_thread_loop(queue)) ;
     vnc_queue_clear(queue);