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42 lines
641 B
Nim
42 lines
641 B
Nim
discard """
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output: "90"
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"""
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when false:
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template lock(a, b: ptr Lock; body: stmt) =
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if cast[int](a) < cast[int](b):
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pthread_mutex_lock(a)
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pthread_mutex_lock(b)
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else:
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pthread_mutex_lock(b)
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pthread_mutex_lock(a)
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{.locks: [a, b].}:
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try:
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body
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finally:
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pthread_mutex_unlock(a)
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pthread_mutex_unlock(b)
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type
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ProtectedCounter[T] = object
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i {.guard: L.}: T
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L: int
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var
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c: ProtectedCounter[int]
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c.i = 89
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template atomicRead(L, x): untyped =
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{.locks: [L].}:
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x
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proc main =
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{.locks: [c.L].}:
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inc c.i
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discard
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echo(atomicRead(c.L, c.i))
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main()
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