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Add debug check function LWLockHeldByMeInMode()

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Tests whether my process holds a lock in given mode.
Add initial usage in MarkBufferDirty().

Thomas Munro
This commit is contained in:
Simon Riggs
2016-09-05 10:38:08 +01:00
parent ec03f4121c
commit 016abf1fb8
3 changed files with 23 additions and 5 deletions
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4
src/backend/storage/buffer/bufmgr.c
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@ -1460,8 +1460,8 @@ MarkBufferDirty(Buffer buffer)
bufHdr = GetBufferDescriptor(buffer - 1);
Assert(BufferIsPinned(buffer));
/* unfortunately we can't check if the lock is held exclusively */
Assert(LWLockHeldByMe(BufferDescriptorGetContentLock(bufHdr)));
Assert(LWLockHeldByMeInMode(BufferDescriptorGetContentLock(bufHdr),
LW_EXCLUSIVE));
old_buf_state = pg_atomic_read_u32(&bufHdr->state);
for (;;)