Initial Contribution

libc/include/semaphore.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) 2008 The Android Open Source Project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *  * Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *  * Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+ * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
+ * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
+ * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+#ifndef _SEMAPHORE_H
+#define _SEMAPHORE_H
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+typedef struct {
+    volatile unsigned int  count;
+} sem_t;
+
+#define  SEM_FAILED  NULL
+
+extern int sem_init(sem_t *sem, int pshared, unsigned int value);
+
+extern int    sem_close(sem_t *);
+extern int    sem_destroy(sem_t *);
+extern int    sem_getvalue(sem_t *, int *);
+extern int    sem_init(sem_t *, int, unsigned int);
+extern sem_t *sem_open(const char *, int, ...);
+extern int    sem_post(sem_t *);
+extern int    sem_trywait(sem_t *);
+extern int    sem_unlink(const char *);
+extern int    sem_wait(sem_t *);
+
+__END_DECLS
+
+#endif /* _SEMAPHORE_H */