56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
// Copyright 2013 Google Inc. All Rights Reserved.
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//
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// Lock - Platform independent interface for a Mutex class
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//
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#ifndef WVCDM_CORE_LOCK_H_
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#define WVCDM_CORE_LOCK_H_
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#include "wv_cdm_types.h"
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namespace wvcdm {
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// Simple lock class. The implementation is platform dependent.
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//
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// The lock must be unlocked by the thread that locked it.
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// The lock is also not recursive (ie. cannot be taken multiple times).
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class Lock {
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public:
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Lock();
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~Lock();
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void Acquire();
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void Release();
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// Acquires a lock if not held and returns true.
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// Returns false if the lock is held by another thread.
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bool Try();
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friend class AutoLock;
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private:
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class Impl;
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Impl* impl_;
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CORE_DISALLOW_COPY_AND_ASSIGN(Lock);
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};
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// Manages the lock automatically. It will be locked when AutoLock
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// is constructed and release when AutoLock goes out of scope.
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class AutoLock {
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public:
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explicit AutoLock(Lock& lock) : lock_(&lock) { lock_->Acquire(); }
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explicit AutoLock(Lock* lock) : lock_(lock) { lock_->Acquire(); }
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~AutoLock() { lock_->Release(); }
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private:
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Lock* lock_;
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CORE_DISALLOW_COPY_AND_ASSIGN(AutoLock);
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};
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}; // namespace wvcdm
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#endif // WVCDM_CORE_LOCK_H_
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