72 lines
1.6 KiB
C++
72 lines
1.6 KiB
C++
/*
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* Copyright © 2016 Mozilla Foundation
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*
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* This program is made available under an ISC-style license. See the
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* accompanying file LICENSE for details.
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*/
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#if !defined(CUBEB_UTILS_WIN)
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#define CUBEB_UTILS_WIN
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#include <windows.h>
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#include "cubeb-internal.h"
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/* This wraps a critical section to track the owner in debug mode, adapted from
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NSPR and http://blogs.msdn.com/b/oldnewthing/archive/2013/07/12/10433554.aspx */
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class owned_critical_section
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{
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public:
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owned_critical_section()
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#ifndef NDEBUG
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: owner(0)
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#endif
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{
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InitializeCriticalSection(&critical_section);
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}
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~owned_critical_section()
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{
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DeleteCriticalSection(&critical_section);
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}
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void enter()
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{
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EnterCriticalSection(&critical_section);
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#ifndef NDEBUG
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XASSERT(owner != GetCurrentThreadId() && "recursive locking");
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owner = GetCurrentThreadId();
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#endif
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}
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void leave()
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{
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#ifndef NDEBUG
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/* GetCurrentThreadId cannot return 0: it is not a the valid thread id */
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owner = 0;
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#endif
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LeaveCriticalSection(&critical_section);
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}
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/* This is guaranteed to have the good behaviour if it succeeds. The behaviour
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is undefined otherwise. */
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void assert_current_thread_owns()
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{
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#ifndef NDEBUG
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/* This implies owner != 0, because GetCurrentThreadId cannot return 0. */
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XASSERT(owner == GetCurrentThreadId());
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#endif
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}
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private:
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CRITICAL_SECTION critical_section;
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#ifndef NDEBUG
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DWORD owner;
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#endif
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// Disallow copy and assignment because CRICICAL_SECTION cannot be copied.
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owned_critical_section(const owned_critical_section&);
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owned_critical_section& operator=(const owned_critical_section&);
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};
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#endif /* CUBEB_UTILS_WIN */
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