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// @file dur.h durability support
#pragma once
#include "diskloc.h"
namespace mongo {
namespace dur {
/** call writing...() to declare "i'm about to write to x and it should be logged for redo."
failure to call writing...() is checked in _DEBUG mode by using a read only mapped view
(i.e., you'll segfault if you don't...)
*/
#if !defined(_DURABLE)
inline void* writingPtr(void *x, size_t len) { return x; }
inline DiskLoc& writingDiskLoc(DiskLoc& d) { return d; }
inline int& writingInt(int& d) { return d; }
template <typename T> inline T* writing(T *x) { return x; }
inline void assertReading(void *p) { }
inline void assertWriting(void *p) { }
#else
void* writingPtr(void *x, size_t len);
inline DiskLoc& writingDiskLoc(DiskLoc& d) {
#if defined(_DEBUG)
return *((DiskLoc*) writingPtr(&d, sizeof(d)));
#else
return d;
#endif
}
inline int& writingInt(int& d) {
#if defined(_DEBUG)
return *((int*) writingPtr(&d, sizeof(d)));
#else
return d;
#endif
}
template <typename T>
inline
T* writing(T *x) {
#if defined(_DEBUG)
return (T*) writingPtr(x, sizeof(T));
#else
return x;
#endif
}
void assertReading(void *p);
void assertWriting(void *p);
#endif
}
inline DiskLoc& DiskLoc::writing() {
return dur::writingDiskLoc(*this);
}
}
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