futex_map.hh

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/*
 * Copyright (c) 2017 Advanced Micro Devices, Inc.
 * 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;
 * neither the name of the copyright holders nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * 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
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 */
 
#ifndef __FUTEX_MAP_HH__
#define __FUTEX_MAP_HH__
 
#include <unordered_map>
#include <unordered_set>
 
#include <cpu/thread_context.hh>
 
class FutexKey {
  public:
    uint64_t addr;
    uint64_t tgid;
 
    FutexKey(uint64_t addr_in, uint64_t tgid_in);
 
    bool operator==(const FutexKey &in) const;
};
 
namespace std {
    template <>
    struct hash<FutexKey>
    {
        size_t operator()(const FutexKey& in) const;
    };
}
 
class WaiterState {
  public:
    ThreadContext* tc;
    int bitmask;
 
    WaiterState(ThreadContext* _tc, int _bitmask);
 
    bool checkMask(int wakeup_bitmask) const;
};
 
typedef std::list<WaiterState> WaiterList;
 
class FutexMap : public std::unordered_map<FutexKey, WaiterList>
{
  public:
    void suspend(Addr addr, uint64_t tgid, ThreadContext *tc);
 
    int wakeup(Addr addr, uint64_t tgid, int count);
 
    void suspend_bitset(Addr addr, uint64_t tgid, ThreadContext *tc,
                   int bitmask);
 
    int wakeup_bitset(Addr addr, uint64_t tgid, int bitmask);
 
    int requeue(Addr addr1, uint64_t tgid, int count, int count2, Addr addr2);
 
    bool is_waiting(ThreadContext *tc);
 
  private:
 
    std::unordered_set<ThreadContext *> waitingTcs;
};
 
#endif // __FUTEX_MAP_HH__