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Commit38f8bdc

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Modify the isolation tester so that multiple sessions can wait.
This allows testing of deadlock scenarios. Scenarios that wouldpreviously have been considered invalid are now simply taken as ascenario in which more than one backend will wait.
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‎src/test/isolation/README

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@@ -107,10 +107,11 @@ Each step may contain commands that block until further action has been taken
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(most likely, some other session runs a step that unblocks it or causes a
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deadlock). A test that uses this ability must manually specify valid
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permutations, i.e. those that would not expect a blocked session to execute a
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command. If the test fails to follow that rule, the test is aborted.
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Currently, at most one step can be waiting at a time. As long as one
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step is waiting, subsequent steps are run to completion synchronously.
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command. If a test fails to follow that rule, isolationtester will cancel it
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after 60 seconds. If the cancel doesn't work, isolationtester will exit
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uncleanly after a total of 75 seconds of wait time. Testing invalid
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permutations should be avoided because they can make the isolation tests take
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a very long time to run, and they serve no useful testing purpose.
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Note that isolationtester recognizes that a command has blocked by looking
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to see if it is shown as waiting in the pg_locks view; therefore, only

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