race() takes a list of futures and returns the result of whichever finishes first. The remaining futures are cancelled:
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If runnext is empty, the scheduler takes from the ring buffer—a lock-free circular queue of up to 256 goroutines. Only the owning M writes to this queue (single producer), so no locks are needed for the common case.，这一点在谷歌中也有详细论述
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So in the 1950s and ‘60s, the goal of every single business that employed humans was to find ways to replace humans with machines: in economic terms, to substitute capital for labor. And even though they were a relatively labor-light business to start with, this was true of banks as well. This was the case in the United States, but it was actually particularly true in Europe, where labor unrest among bank employees was an ongoing headache. (Financial sector employees were actually some of the most militant of all white-collar workers during this period: because of prolonged strikes by bank employees, Irish banks were closed 10 percent of the time between 1966 and 1976.)