Mutex.h

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#pragma once

#include <OnixS/CME/ConflatedTCP/ABI.h>

namespace OnixS {
namespace CME {
namespace ConflatedTCP {
namespace Threading {

/// Mutex.
///
/// Protects resources from simultaneous access by multiple threads.
///
/// Only one thread at a time can own instance of this class.
///
/// This implementation is optimized for locking threads that are in the same process.
///
/// \note It is NOT suitable for interprocess synchronization.
/// \note Recursive locking is NOT supported.
class ONIXS_CONFLATEDTCP_EXPORTED Mutex
{
public:
    friend ONIXS_CONFLATEDTCP_API_DECL(class, Condition);

    /// Initializes the instance.
    Mutex();

    /// Destructs the instance.
    ~Mutex();

    /// Acquires the lock ownership.
    ///
    /// If the mutex is already occupied by another thread
    /// blocks the current thread and waits until it
    /// will be released by the owner.
    void acquire();

    /// Tries to acquires the lock ownership.
    ///
    /// \return `false` if the mutex is already occupied by another thread,
    /// otherwise - `true`.
    bool tryAcquire();

    /// Releases the ownership (lock) and
    /// unblocks one of the waiting threads.
    void release();

private:
    void * impl_;

    // Copying & assignment is prohibited.
    Mutex(const Mutex &);
    Mutex & operator = (const Mutex &);
};
}
}
}
}