fix win32 build

On Windows, cpus.c needs access to the hThread.  Add a Windows-specific
function to grab it.  This requires changing the CPU threads to
joinable.  There is no substantial change because the threads run
in an infinite loop.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>

cpu-defs.h

@@ -153,6 +153,14 @@ typedef struct CPUWatchpoint {
     QTAILQ_ENTRY(CPUWatchpoint) entry;
 } CPUWatchpoint;
 
+#ifdef _WIN32
+#define CPU_COMMON_THREAD \
+    void *hThread;
+
+#else
+#define CPU_COMMON_THREAD
+#endif
+
 #define CPU_TEMP_BUF_NLONGS 128
 #define CPU_COMMON                                                      \
     struct TranslationBlock *current_tb; /* currently executing TB  */  \
@@ -211,6 +219,7 @@ typedef struct CPUWatchpoint {
     uint32_t stop;   /* Stop request */                                 \
     uint32_t stopped; /* Artificially stopped */                        \
     struct QemuThread *thread;                                          \
+    CPU_COMMON_THREAD                                                   \
     struct QemuCond *halt_cond;                                         \
     int thread_kicked;                                                  \
     struct qemu_work_item *queued_work_first, *queued_work_last;        \

cpus.c

@@ -793,9 +793,9 @@ static void qemu_cpu_kick_thread(CPUState *env)
     }
 #else /* _WIN32 */
     if (!qemu_cpu_is_self(env)) {
-        SuspendThread(env->thread->thread);
+        SuspendThread(env->hThread);
         cpu_signal(0);
-        ResumeThread(env->thread->thread);
+        ResumeThread(env->hThread);
     }
 #endif
 }
@@ -911,7 +911,10 @@ static void qemu_tcg_init_vcpu(void *_env)
         qemu_cond_init(env->halt_cond);
         tcg_halt_cond = env->halt_cond;
         qemu_thread_create(env->thread, qemu_tcg_cpu_thread_fn, env,
-                           QEMU_THREAD_DETACHED);
+                           QEMU_THREAD_JOINABLE);
+#ifdef _WIN32
+        env->hThread = qemu_thread_get_handle(env->thread);
+#endif
         while (env->created == 0) {
             qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
         }
@@ -928,7 +931,7 @@ static void qemu_kvm_start_vcpu(CPUState *env)
     env->halt_cond = g_malloc0(sizeof(QemuCond));
     qemu_cond_init(env->halt_cond);
     qemu_thread_create(env->thread, qemu_kvm_cpu_thread_fn, env,
-                       QEMU_THREAD_DETACHED);
+                       QEMU_THREAD_JOINABLE);
     while (env->created == 0) {
         qemu_cond_wait(&qemu_cpu_cond, &qemu_global_mutex);
     }

qemu-thread-win32.c

@@ -252,14 +252,10 @@ void *qemu_thread_join(QemuThread *thread)
      * discard the handle that _beginthreadex gives back, and
      * get another copy of the handle here.
      */
-    EnterCriticalSection(&data->cs);
-    if (!data->exited) {
-        handle = OpenThread(SYNCHRONIZE, FALSE, thread->tid);
-        LeaveCriticalSection(&data->cs);
+    handle = qemu_thread_get_handle(thread);
+    if (handle) {
         WaitForSingleObject(handle, INFINITE);
         CloseHandle(handle);
-    } else {
-        LeaveCriticalSection(&data->cs);
     }
     ret = data->ret;
     DeleteCriticalSection(&data->cs);
@@ -308,6 +304,27 @@ void qemu_thread_get_self(QemuThread *thread)
     thread->tid = GetCurrentThreadId();
 }
 
+HANDLE qemu_thread_get_handle(QemuThread *thread)
+{
+    QemuThreadData *data;
+    HANDLE handle;
+
+    data = thread->data;
+    if (!data) {
+        return NULL;
+    }
+
+    EnterCriticalSection(&data->cs);
+    if (!data->exited) {
+        handle = OpenThread(SYNCHRONIZE | THREAD_SUSPEND_RESUME, FALSE,
+                            thread->tid);
+    } else {
+        handle = NULL;
+    }
+    LeaveCriticalSection(&data->cs);
+    return handle;
+}
+
 int qemu_thread_is_self(QemuThread *thread)
 {
     return GetCurrentThreadId() == thread->tid;

qemu-thread-win32.h

@@ -19,4 +19,7 @@ struct QemuThread {
     unsigned tid;
 };
 
+/* Only valid for joinable threads.  */
+HANDLE qemu_thread_get_handle(QemuThread *thread);
+
 #endif