58 lines
1.2 KiB
C++
58 lines
1.2 KiB
C++
/* lock.h */
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/**
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* Copyright - See the COPYRIGHT that is included with this distribution.
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* EPICS pvDataCPP is distributed subject to a Software License Agreement found
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* in file LICENSE that is included with this distribution.
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*/
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#ifndef LOCK_H
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#define LOCK_H
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#include <stdexcept>
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#include <epicsMutex.h>
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#include "noDefaultMethods.h"
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/* This is based on item 14 of
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* Effective C++, Third Edition, Scott Meyers
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*/
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namespace epics { namespace pvData {
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class Mutex {
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public:
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Mutex() : id(epicsMutexCreate())
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{if(!id) throw std::bad_alloc();}
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~Mutex() { epicsMutexDestroy(id) ;}
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void lock(){
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if(epicsMutexLock(id)!=epicsMutexLockOK)
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throw std::logic_error("Failed to acquire Mutex");
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}
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void unlock(){epicsMutexUnlock(id);}
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private:
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epicsMutexId id;
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};
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class Lock : private NoDefaultMethods {
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public:
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explicit Lock(Mutex &m)
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: mutexPtr(m), locked(true)
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{ mutexPtr.lock();}
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~Lock(){unlock();}
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void lock()
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{
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if(!locked) mutexPtr.lock();
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locked = true;
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}
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void unlock()
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{
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if(locked)
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mutexPtr.unlock();
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locked=false;
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}
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bool ownsLock() const{return locked;}
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private:
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Mutex &mutexPtr;
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bool locked;
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};
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}}
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#endif /* LOCK_H */
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