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Provide a way to predefine LWLock tranche IDs.

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It's a bit cumbersome to use LWLockNewTrancheId(), because the returned
value needs to be shared between backends so that each backend can call
LWLockRegisterTranche() with the correct ID.  So, for built-in tranches,
use a hard-coded value instead.

This is motivated by an upcoming patch adding further built-in tranches.

Andres Freund and Robert Haas
This commit is contained in:
Robert Haas
2015-12-15 11:32:13 -05:00
parent 43cd468cf0
commit 3fed417452
3 changed files with 18 additions and 10 deletions
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7
src/backend/storage/lmgr/lwlock.c
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@@ -445,7 +445,7 @@ CreateLWLocks(void)
/* Initialize all LWLocks in main array */
for (id = 0, lock = MainLWLockArray; id < numLocks; id++, lock++)
LWLockInitialize(&lock->lock, 0);
LWLockInitialize(&lock->lock, LWTRANCHE_MAIN);
/*
* Initialize the dynamic-allocation counters, which are stored just
@@ -457,7 +457,7 @@ CreateLWLocks(void)
LWLockCounter = (int *) ((char *) MainLWLockArray - 3 * sizeof(int));
LWLockCounter[0] = NUM_FIXED_LWLOCKS;
LWLockCounter[1] = numLocks;
LWLockCounter[2] = 1; /* 0 is the main array */
LWLockCounter[2] = LWTRANCHE_FIRST_USER_DEFINED;
}
if (LWLockTrancheArray == NULL)
@@ -466,12 +466,13 @@ CreateLWLocks(void)
LWLockTrancheArray = (LWLockTranche **)
MemoryContextAlloc(TopMemoryContext,
LWLockTranchesAllocated * sizeof(LWLockTranche *));
Assert(LWLockTranchesAllocated >= LWTRANCHE_FIRST_USER_DEFINED);
}
MainLWLockTranche.name = "main";
MainLWLockTranche.array_base = MainLWLockArray;
MainLWLockTranche.array_stride = sizeof(LWLockPadded);
LWLockRegisterTranche(0, &MainLWLockTranche);
LWLockRegisterTranche(LWTRANCHE_MAIN, &MainLWLockTranche);
}
/*