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diff --git a/include/private/utils/futex_synchro.h b/include/private/utils/futex_synchro.h
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+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _FUTEX_SYNCHRO_H
+#define _FUTEX_SYNCHRO_H
+
+#ifndef HAVE_FUTEX
+#error "HAVE_FUTEX not defined"
+#endif
+
+#define FUTEX_WAIT_INFINITE (0)
+
+typedef struct futex_mutex_t futex_mutex_t;
+
+struct futex_mutex_t
+{
+ volatile int value;
+};
+
+typedef struct futex_cond_t futex_cond_t;
+
+struct futex_cond_t
+{
+ volatile int value;
+};
+
+
+#if __cplusplus
+extern "C" {
+#endif
+
+void futex_mutex_init(futex_mutex_t *m);
+int futex_mutex_lock(futex_mutex_t *m, unsigned msec);
+void futex_mutex_unlock(futex_mutex_t *m);
+int futex_mutex_trylock(futex_mutex_t *m);
+
+void futex_cond_init(futex_cond_t *c);
+int futex_cond_wait(futex_cond_t *c, futex_mutex_t *m, unsigned msec);
+void futex_cond_signal(futex_cond_t *c);
+void futex_cond_broadcast(futex_cond_t *c);
+
+#if __cplusplus
+} // extern "C"
+#endif
+
+#endif // _FUTEX_SYNCHRO_H
+