# 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/xkbihaa
yue-fang-readfog
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Go channel 計數信號量**
Go 併發設計的一個慣用法就是將帶緩衝 channel 用作計數信號量（counting semaphore）。帶緩衝 channel 中的當前數據個數代表的是當前同時處於活動狀態（處理業務）的 goroutine 的數量，而帶緩衝 channel 的容量（capacity）就代表了允許同時處於活動狀態的 goroutine 的最大數量。向帶緩衝 channel 的一個發送操作表示獲取一個信號量， ⌘ Read more