libplatform-161.tar.gz

[apple/libplatform.git] / private / os / semaphore_private.h

diff --git a/private/os/semaphore_private.h b/private/os/semaphore_private.h
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+/*
+ * Copyright (c) 2008-2013 Apple Inc. All rights reserved.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_START@
+ *
+ * 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.
+ *
+ * @APPLE_APACHE_LICENSE_HEADER_END@
+ */
+
+#ifndef __OS_SEMAPHORE_PRIVATE__
+#define __OS_SEMAPHORE_PRIVATE__
+
+#include <Availability.h>
+#include <stdint.h>
+#include <os/base_private.h>
+#include <os/tsd.h>
+
+OS_ASSUME_NONNULL_BEGIN
+
+__BEGIN_DECLS
+
+#define OS_SEMAPHORE_SPI_VERSION 20130313
+
+typedef uintptr_t os_semaphore_t;
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+OS_EXPORT OS_WARN_RESULT OS_NOTHROW
+os_semaphore_t _os_semaphore_create(void);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+OS_EXPORT OS_NOTHROW
+void _os_semaphore_dispose(os_semaphore_t);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+OS_EXPORT OS_NOTHROW
+void _os_semaphore_wait(os_semaphore_t);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_9,__IPHONE_7_0)
+OS_EXPORT OS_NOTHROW
+void _os_semaphore_signal(os_semaphore_t);
+
+OS_WARN_RESULT OS_NOTHROW
+__header_always_inline os_semaphore_t
+os_get_cached_semaphore(void)
+{
+       os_semaphore_t sema;
+       sema = (os_semaphore_t)_os_tsd_get_direct(__TSD_SEMAPHORE_CACHE);
+       if (os_unlikely(!sema)) {
+               return _os_semaphore_create();
+       }
+       _os_tsd_set_direct(__TSD_SEMAPHORE_CACHE, 0);
+       return sema;
+}
+
+OS_NOTHROW
+__header_always_inline void
+os_put_cached_semaphore(os_semaphore_t sema)
+{
+       os_semaphore_t old_sema;
+       old_sema = (os_semaphore_t)_os_tsd_get_direct(__TSD_SEMAPHORE_CACHE);
+       _os_tsd_set_direct(__TSD_SEMAPHORE_CACHE, (void*)sema);
+       if (os_unlikely(old_sema)) {
+               return _os_semaphore_dispose(old_sema);
+       }
+}
+
+OS_NOTHROW
+__header_always_inline void
+os_semaphore_wait(os_semaphore_t sema)
+{
+       return _os_semaphore_wait(sema);
+}
+
+OS_NOTHROW
+__header_always_inline void
+os_semaphore_signal(os_semaphore_t sema)
+{
+       return _os_semaphore_signal(sema);
+}
+
+__END_DECLS
+
+OS_ASSUME_NONNULL_END
+
+#endif // __OS_SEMAPHORE_PRIVATE__