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We have a single thread that runs a no-op initialization once and then repeatedly runs checks of the initialization (i.e., an acquire load and conditional jump) in a tight loop. This gives us, on average, the best-case latency of pthread_once (the initialization is the exactly-once slow path, and we're not looking at initialization-related synchronization overheads in this case).
10 lines
434 B
Plaintext
10 lines
434 B
Plaintext
# This tests the common-case scenario for pthread_once.
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# We have a single thread that runs a no-op initialization once and then
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# repeatedly runs checks of the initialization (i.e., an acquire load and
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# conditional jump) in a tight loop.
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# scripts/bench.py doesn't handle function pointers, so we just use void *:
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## args: pthread_once_t *:void *
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## includes: pthread.h
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## include-sources: pthread_once-source.c
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&once, once_handler
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