lsst::ap::SharedMutex Class Reference

A wrapper for a POSIX process shared mutual exclusion lock. More...

#include <Mutex.h>

Inheritance diagram for lsst::ap::SharedMutex:

Public Member Functions
	SharedMutex ()
	~SharedMutex ()

Private Member Functions
void	acquire ()
bool	tryAcquire ()
void	release ()

Private Attributes
::pthread_mutex_t	_mutex

Friends
class	ScopedLock< SharedMutex >
class	Condition< SharedMutex >

Detailed Description

A wrapper for a POSIX process shared mutual exclusion lock.

Definition at line 97 of file Mutex.h.

Constructor & Destructor Documentation

lsst::ap::SharedMutex::SharedMutex

(

)

Definition at line 46 of file Mutex.cc.

                               {
    ::pthread_mutexattr_t attr;

    int err = ::pthread_mutexattr_init(&attr);
    if (err != 0) {
        throw LSST_EXCEPT(ex::RuntimeError,
            (boost::format("pthread_mutexattr_init() failed, return code: %1%") % err).str());
    }
    ScopeGuard attrGuard(boost::bind(::pthread_mutexattr_destroy, &attr));
    ::pthread_mutexattr_setpshared(&attr, PTHREAD_PROCESS_SHARED);
    err = ::pthread_mutex_init(&_mutex, &attr);
    if (err != 0) {
        throw LSST_EXCEPT(ex::RuntimeError,
            (boost::format("pthread_mutex_init() failed, return code: %1%") % err).str());
    }
}

lsst::ap::SharedMutex::~SharedMutex ( )

inline

Definition at line 103 of file Mutex.h.

                   {
        int result = ::pthread_mutex_destroy(&_mutex);
        assert(result == 0);
    }

Member Function Documentation

void lsst::ap::SharedMutex::acquire ( )

inlineprivate

Definition at line 112 of file Mutex.h.

                   {
        int result = ::pthread_mutex_lock(&_mutex);
        assert(result == 0);
    }

void lsst::ap::SharedMutex::release ( )

inlineprivate

Definition at line 121 of file Mutex.h.

                   {
        int result = ::pthread_mutex_unlock(&_mutex);
        assert(result == 0);
    }

bool lsst::ap::SharedMutex::tryAcquire ( )

inlineprivate

Definition at line 117 of file Mutex.h.

                      {
        return ::pthread_mutex_trylock(&_mutex) == 0;
    }

Friends And Related Function Documentation

friend class Condition< SharedMutex >

friend

Definition at line 127 of file Mutex.h.

friend class ScopedLock< SharedMutex >

friend

Definition at line 126 of file Mutex.h.

Member Data Documentation

::pthread_mutex_t lsst::ap::SharedMutex::_mutex

private

Definition at line 110 of file Mutex.h.

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

• /lsst/home/lsstsw/stack/Linux64/ap/master-g60f1e072bb+1/include/lsst/ap/Mutex.h
• /lsst/home/lsstsw/stack/Linux64/ap/master-g60f1e072bb+1/src/Mutex.cc