Commitbaa2e44

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check for max_prepared_xacts == 0 before locking GXact

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Original file line number	Diff line number	Diff line change
`@@ -631,6 +631,14 @@ LockGXact(const char *gid, Oid user)`
`631`	`631`	`before_shmem_exit(AtProcExit_Twophase,0);`
`632`	`632`	`twophaseExitRegistered= true;`
`633`	`633`	`}`
	`634`	`+`
	`635`	`+/* here we know in advance that there are no prepared transactions */`
	`636`	`+if (max_prepared_xacts==0)`
	`637`	`+ereport(ERROR,`
	`638`	`+(errcode(ERRCODE_UNDEFINED_OBJECT),`
	`639`	`+errmsg("prepared transaction with identifier \"%s\" does not exist",`
	`640`	`+gid)));`
	`641`	`+`
`634`	`642`	`MyLockedGxact=NULL;`
`635`	`643`	`i=string_hash(gid,0) %max_prepared_xacts;`
`636`	`644`	`Retry:`

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