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This code is stable, and the test is finicky, especially on high core
count systems, so just disable it.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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On a many-core machine with the race detector enabled,
this test can take several minutes to complete.
Signed-off-by: Josh Bleecher Snyder <josh@tailscale.com>
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Before, the code attached a finalizer to an object that wasn't returned,
resulting in immediate garbage collection. Instead return the actual
pointer.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Here is the old implementation:
type WaitPool struct {
c chan interface{}
}
func NewWaitPool(max uint32, new func() interface{}) *WaitPool {
p := &WaitPool{c: make(chan interface{}, max)}
for i := uint32(0); i < max; i++ {
p.c <- new()
}
return p
}
func (p *WaitPool) Get() interface{} {
return <- p.c
}
func (p *WaitPool) Put(x interface{}) {
p.c <- x
}
It performs worse than the new one:
name old time/op new time/op delta
WaitPool-16 16.4µs ± 5% 15.1µs ± 3% -7.86% (p=0.008 n=5+5)
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Channels are FIFO which means we have guaranteed cache misses.
Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
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Jason A. Donenfeld
Josh Bleecher Snyder