PMDK C++ bindings  1.8.2
This is the C++ bindings documentation for PMDK's libpmemobj.
mutex.hpp
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32 
38 #ifndef LIBPMEMOBJ_CPP_MUTEX_HPP
39 #define LIBPMEMOBJ_CPP_MUTEX_HPP
40 
42 #include <libpmemobj/thread.h>
43 #include <libpmemobj/tx_base.h>
44 
45 namespace pmem
46 {
47 
48 namespace obj
49 {
50 
60 class mutex {
61 public:
63  typedef PMEMmutex *native_handle_type;
64 
71  {
72  PMEMobjpool *pop;
73  if ((pop = pmemobj_pool_by_ptr(&plock)) == nullptr)
74  throw pmem::lock_error(
75  1, std::generic_category(),
76  "Persistent mutex not from persistent memory.");
77 
78  pmemobj_mutex_zero(pop, &plock);
79  }
80 
84  ~mutex() = default;
85 
97  void
98  lock()
99  {
100  PMEMobjpool *pop = pmemobj_pool_by_ptr(this);
101  if (int ret = pmemobj_mutex_lock(pop, &this->plock))
102  throw pmem::lock_error(ret, std::system_category(),
103  "Failed to lock a mutex.")
104  .with_pmemobj_errormsg();
105  }
106 
121  bool
123  {
124  PMEMobjpool *pop = pmemobj_pool_by_ptr(this);
125  int ret = pmemobj_mutex_trylock(pop, &this->plock);
126 
127  if (ret == 0)
128  return true;
129  else if (ret == EBUSY)
130  return false;
131  else
132  throw pmem::lock_error(ret, std::system_category(),
133  "Failed to lock a mutex.")
134  .with_pmemobj_errormsg();
135  }
136 
144  void
146  {
147  PMEMobjpool *pop = pmemobj_pool_by_ptr(this);
148  int ret = pmemobj_mutex_unlock(pop, &this->plock);
149  if (ret)
150  throw pmem::lock_error(ret, std::system_category(),
151  "Failed to unlock a mutex.")
152  .with_pmemobj_errormsg();
153  }
154 
161  native_handle() noexcept
162  {
163  return &this->plock;
164  }
165 
171  enum pobj_tx_param
172  lock_type() const noexcept
173  {
174  return TX_PARAM_MUTEX;
175  }
176 
180  mutex &operator=(const mutex &) = delete;
181 
185  mutex(const mutex &) = delete;
186 
187 private:
189  PMEMmutex plock;
190 };
191 
192 } /* namespace obj */
193 
194 } /* namespace pmem */
195 
196 #endif /* LIBPMEMOBJ_CPP_MUTEX_HPP */
PMEMmutex * native_handle_type
Implementation defined handle to the native type.
Definition: mutex.hpp:63
mutex()
Default constructor.
Definition: mutex.hpp:70
enum pobj_tx_param lock_type() const noexcept
The type of lock needed for the transaction API.
Definition: mutex.hpp:172
~mutex()=default
Defaulted destructor.
native_handle_type native_handle() noexcept
Access a native handle to this condition variable.
Definition: mutex.hpp:161
Custom exceptions.
PMEMmutex plock
A POSIX style PMEM-resident mutex.
Definition: mutex.hpp:189
Persistent memory resident mutex implementation.
Definition: mutex.hpp:60
void lock()
Locks the mutex, blocks if already locked.
Definition: mutex.hpp:98
mutex & operator=(const mutex &)=delete
Deleted assignment operator.
Custom lock error class.
Definition: pexceptions.hpp:109
bool try_lock()
Tries to lock the mutex, returns regardless if the lock succeeds.
Definition: mutex.hpp:122
void unlock()
Unlocks a previously locked mutex.
Definition: mutex.hpp:145
A persistent version of concurrent hash map implementation Ref: https://arxiv.org/abs/1509....
Definition: allocation_flag.hpp:43