Lock Class Reference

#include <thread.h>

Public Member Functions
	Lock (bool rec=false)
	~Lock ()
void	lock ()
void	unlock ()
bool	is_locked ()

Private Member Functions
void	resume_lock (int l)
int	break_lock ()

Private Attributes
pthread_mutex_t	mutex
Thread	owner
int	locked
bool	recursive

Friends
class	ConditionVariable

Detailed Description

Definition at line 17 of file thread.h.

Constructor & Destructor Documentation

Lock()

Lock::Lock ( bool  rec = false )

inline

Definition at line 36 of file thread.h.

                         {
    extern pthread_t no_thread;
    pthread_mutex_init(&mutex, NULL);
    locked = 0;
    recursive = rec;
    owner = no_thread;
  }

~Lock()

Lock::~Lock ( )

inline

Definition at line 43 of file thread.h.

          {
    pthread_mutex_destroy(&mutex);
  }

Member Function Documentation

break_lock()

int Lock::break_lock ( )

inlineprivate

Definition at line 28 of file thread.h.

                   {
    extern pthread_t no_thread;
    int result = locked;
    owner = no_thread;
    locked = 0;
    return result;
  }

is_locked()

bool Lock::is_locked ( )

inline

Definition at line 68 of file thread.h.

                   {
    return locked != 0 && owner == pthread_self();
  }

lock()

void Lock::lock ( )

inline

Definition at line 46 of file thread.h.

              {
    Thread self = pthread_self();
    if (owner == self) {
      if (locked && !recursive)
        ThreadError("locking mutex twice");
    }
    else
      pthread_mutex_lock(&mutex);
    owner = self;
    locked++;
  }

resume_lock()

void Lock::resume_lock ( int  l )

inlineprivate

Definition at line 24 of file thread.h.

                          {
    owner = pthread_self();
    locked = l;
  }

unlock()

void Lock::unlock ( )

inline

Definition at line 57 of file thread.h.

                {
    extern pthread_t no_thread;
    Thread self = pthread_self();
    if (owner != self)
      ThreadError("unlocking unowned lock");
    locked--;
    if (locked == 0) {
      owner = no_thread;
      pthread_mutex_unlock(&mutex);
    }
  }

Friends And Related Symbol Documentation

ConditionVariable

friend class ConditionVariable

friend

Definition at line 20 of file thread.h.

Field Documentation

locked

int Lock::locked

private

Definition at line 22 of file thread.h.

mutex

pthread_mutex_t Lock::mutex

private

Definition at line 19 of file thread.h.

owner

Thread Lock::owner

private

Definition at line 21 of file thread.h.

recursive

bool Lock::recursive

private

Definition at line 23 of file thread.h.

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The documentation for this class was generated from the following file:

• Singular/dyn_modules/systhreads/thread.h