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