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9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Use is subject to license terms.
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * Copyright (c) 2012 by Delphix. All rights reserved.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * ASSERTION:
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Positive test for ring buffer policy.
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * SECTION: Buffers and Buffering/ring Policy;
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Buffers and Buffering/Buffer Sizes;
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Options and Tunables/bufsize;
9512fe850e98fdd448c638ca63fdd92a8a510255ahl * Options and Tunables/bufpolicy
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * We make some regrettable assumptions about the implementation in this
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * test. First, we assume that each entry for the printf() of an int
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * takes _exactly_ 16 bytes (4 bytes for the EPID, 8 bytes for the
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * timestamp, 4 bytes for the payload). Second, we assume that by
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * allocating storage for n + 1 records, we will get exactly n. Here is
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * why: the final predicate that evaluates to false will reserve space
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * that it won't use. This act of reservation will advance the wrapped
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * offset. That record won't be subsequently used, but the wrapped
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * offset has advanced. (And in this case, that old record is clobbered
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * by the exit() anyway.) Thirdly: we rely on t_cpu/cpu_id. Finally:
e5803b76927480e8f9b67b22201c484ccf4c2bcfAdam H. Leventhal * we rely on being able to run on the CPU that we first ran on.