In CreateSharedMemoryAndSemaphores, there is the following comment, just
before CreateLWLocks():
/*
* Now initialize LWLocks, which do shared memory allocation and are
* needed for InitShmemIndex.
*/
Also, in InitShmemAllocation, there is:
/* ShmemIndex can't be set up yet (need LWLocks first) */
Are these comments still true? Specifically, is it necessary to call
CreateLWLocks before InitShmemIndex? I think it used to be, but then the
ShmemIndexLock got made into a separate spinlock in its own right.
It doesn't appear to be true, and I'd like to rearrange this section of the
code, as part of a possible solution to a Win32 shmem/semaphore bootstrap
problem (postgres semaphores under Win32 uses ShmemIndex which uses
spinlocks which use shared memory which use semaphores which ...).
If ok, I was specifically thinking of rolling the ShmemIndex initialization
into InitShmemAllocation, which I suspect used to do this anyway... any
complaints?
Cheers,
Claudio
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