# I am the Watcher. I am your guide through this vast new twtiverse.
# 
# Usage:
#     https://watcher.sour.is/api/plain/users              View list of users and latest twt date.
#     https://watcher.sour.is/api/plain/twt                View all twts.
#     https://watcher.sour.is/api/plain/mentions?uri=:uri  View all mentions for uri.
#     https://watcher.sour.is/api/plain/conv/:hash         View all twts for a conversation subject.
# 
# Options:
#     uri     Filter to show a specific users twts.
#     offset  Start index for quey.
#     limit   Count of items to return (going back in time).
# 
# twt range = 1 1
# self = https://watcher.sour.is/conv/pds6viq
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Go 併發控制：semaphore 詳解**
今天我們來介紹一個 Go 官方庫 x 提供的擴展併發原語 semaphore，譯爲 “信號量”。因爲它就像一個信號一樣控制多個 goroutine 之間協作。概念講解我先簡單介紹下信號量的概念，爲不熟悉的讀者作爲補充知識。一個生活中的例子：假設一個餐廳總共有 10 張餐桌，每來 1 位顧客佔用 1 張餐桌，那麼同一時間共計可以有 10 人在就餐，超過 10 人則需要排隊等位；如果有 1 位顧客就餐 ⌘ Read more