Thread.h

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* Copyright Onix Solutions Limited [OnixS]. All rights reserved.
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#pragma once

#include <set>

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

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

/// Logical processors that a thread is allowed to run on (first logical CPU has index 0).
typedef size_t CpuIndex;
typedef std::set < CpuIndex > CpuIndexes;

/// Represents set of CPU indices.
class ONIXS_CONFLATEDTCP_EXPORTED ThreadAffinity
{
public:

    /// Constructs thread affinity from the string presentation.
    /// Symbol ',' is used as the CPU index delimiter.
    explicit ThreadAffinity(const std::string & str);

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

    /// Read-only access to index collection.
    const CpuIndexes & cpuIndexes() const;

    /// Collection of CPU indices.
    CpuIndexes & cpuIndexes();

    /// Serializes thread affinity to the string presentation.
    std::string toString();

private:
    ThreadAffinity(const ThreadAffinity &);
    ThreadAffinity & operator = (const ThreadAffinity &);

    CpuIndexes * indexes_;
};

/// Current thread related tasks.
class ONIXS_CONFLATEDTCP_EXPORTED ThisThread
{
public:
    /// Suspends the execution of the current thread for
    /// the given amount of time.
    static void sleep(unsigned int milliseconds);

    /// Executes a single instruction during the given number of microseconds.
    static void spinWait(int microseconds);

    /// Sets the processor affinity mask for the current thread.
    static void affinity(const CpuIndexes & cpuIndexes);

    /// Sets the processor affinity mask for the current thread.
    static void affinity(const CpuIndex cpuIndex);

    /// Sets the priority for the current thread.
    static void priority(int priority);

    /// Sets the scheduling policy for the current thread.
    ///
    /// \note This method also sets the priority to the minimal value for the new policy,
    /// therefore, the priority should be set to a necessary value afterwards.
    static void policy(int policy);

    /// \return the platform identifier for the current thread.
    static ThreadId id();

    /// \return the processor number the current thread is running on during the call to this method.
    static unsigned int processorNumber();

private:
    ThisThread(const ThisThread &);
    ThisThread & operator = (const ThisThread &);
};

}
}
}
}