semaphore.h

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/*
* Copyright (c) 2011-2012 MLBA-Team. All rights reserved.
*
* @MLBA_OPEN_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.
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* @MLBA_OPEN_LICENSE_HEADER_END@
*/


#ifndef XDISPATCH_SEMAPHORE_H_
#define XDISPATCH_SEMAPHORE_H_

#ifndef __XDISPATCH_INDIRECT__
#error "Please #include <xdispatch/dispatch.h> instead of this file directly."
#endif

#include <memory>

__XDISPATCH_BEGIN_NAMESPACE

class XDISPATCH_EXPORT semaphore {

    public:
        semaphore(int = 1);
        semaphore(dispatch_semaphore_t);
        semaphore(const semaphore&);
        ~semaphore();

        int release();
        void acquire();
        bool try_acquire(dispatch_time_t);
        bool try_acquire(struct tm*);
        const dispatch_semaphore_t native_semaphore() const;

        semaphore& operator=(const semaphore&);
        bool operator ==(const semaphore&);
        bool operator ==(const dispatch_semaphore_t&);
        bool operator !=(const semaphore&);
        bool operator !=(const dispatch_semaphore_t&);

    private:
        class data;
        pointer<data>::unique d;

};

XDISPATCH_EXPORT std::ostream& operator<<(std::ostream&, const semaphore*);
XDISPATCH_EXPORT std::ostream& operator<<(std::ostream&, const semaphore&);

XDISPATCH_EXPORT bool operator ==(const dispatch_semaphore_t&, const semaphore&);
XDISPATCH_EXPORT bool operator !=(const dispatch_semaphore_t&, const semaphore&);

__XDISPATCH_END_NAMESPACE

#endif /* XDISPATCH_SEMAPHORE_H_ */