The key rings were fastened with hard plastic locks. The lock on the circular ring, Conrad saw, was cracked. On each key ring was a disk stamped with the number of keys that should be in the set. The disk on the circular ring was stamped “18.” Conrad counted the keys three times: there were only sixteen. He phoned Lieutenant Timothy Dial, the jail’s key-control officer, and said, “I’m going to need you to come down here.”
A Chipolo Pop tracker. | Photo by Dominic Preston / The Verge
。体育直播是该领域的重要参考
Atomic registration: wait_for checks the current value and registers the queue inside the same lock acquisition, closing the race where a transition could slip between registration and the initial check.
anadim (@dimitrispapail)
Our cartoonist on a decade of magic moments in the big job for world football’s leading ‘man of the people’