Function AcquireContentLock

src/backend/storage/buffer/bufmgr.c:544–558

static inline void AcquireContentLock(volatile BufferDesc *buf, LWLockMode mode)
{
#ifdef MPROTECT_BUFFERS
	const bool newAcquisition =
		!LWLockHeldByMe(BufferDescriptorGetContentLock(buf));

	LWLockAcquire(BufferDescriptorGetContentLock(buf), mode);

	/* new acquisition of content lock, allow read/write memory access */
	if (newAcquisition)
		BufferMProtect(buf, PROT_READ|PROT_WRITE);
#else
	LWLockAcquire(BufferDescriptorGetContentLock(buf), mode);
#endif
}

static inline bool ConditionalAcquireContentLock(volatile BufferDesc *buf,
												 LWLockMode mode)