Example of method of golang implementing coroutine pool

=== RUN   TestPool
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 0
pool exec: 2
pool exec: 0
pool exec: 1
pool exec: 3
pool exec: 4
pool exec: 7
pool exec: 8
pool exec: 5
pool exec: 6
pool exec: 9
2024/08/02 23:06:20 hello,world97
pool exec: 2
2024/08/02 23:06:20 hello,world42
pool exec: 2
2024/08/02 23:06:20 hello,world57
pool exec: 2
2024/08/02 23:06:20 hello,world56
pool exec: 2
2024/08/02 23:06:20 hello,world55
pool exec: 2
2024/08/02 23:06:20 hello,world54
pool exec: 2
2024/08/02 23:06:20 hello,world53
pool exec: 2
2024/08/02 23:06:20 hello,world52
pool exec: 2
2024/08/02 23:06:20 hello,world51
pool exec: 2
2024/08/02 23:06:20 hello,world50
pool exec: 2
2024/08/02 23:06:20 hello,world49
pool exec: 2
2024/08/02 23:06:20 hello,world48
pool exec: 2
2024/08/02 23:06:20 hello,world47
pool exec: 2
2024/08/02 23:06:20 hello,world46
pool exec: 2
2024/08/02 23:06:20 hello,world45
pool exec: 2
2024/08/02 23:06:20 hello,world44
pool exec: 2
2024/08/02 23:06:20 hello,world95
pool exec: 0
2024/08/02 23:06:20 hello,world43
pool exec: 2
2024/08/02 23:06:20 hello,world41
pool exec: 2
2024/08/02 23:06:20 hello,world40
pool exec: 2
2024/08/02 23:06:20 hello,world33
pool exec: 0
2024/08/02 23:06:20 hello,world39
pool exec: 2
2024/08/02 23:06:20 hello,world38
pool exec: 0
2024/08/02 23:06:20 hello,world37
2024/08/02 23:06:20 hello,world36
pool exec: 2
pool exec: 0
2024/08/02 23:06:20 hello,world96
pool exec: 4
2024/08/02 23:06:20 hello,world98
2024/08/02 23:06:20 hello,world99
pool exec: 3
2024/08/02 23:06:20 hello,world94
2024/08/02 23:06:20 hello,world32
pool exec: 7
2024/08/02 23:06:20 hello,world35
2024/08/02 23:06:20 hello,world31
pool exec: 7
2024/08/02 23:06:20 hello,world90
pool exec: 9
pool exec: 3
2024/08/02 23:06:20 hello,world28
pool exec: 2
2024/08/02 23:06:20 hello,world29
pool exec: 1
2024/08/02 23:06:20 hello,world24
2024/08/02 23:06:20 hello,world26
pool exec: 2
2024/08/02 23:06:20 hello,world34
pool exec: 1
2024/08/02 23:06:20 hello,world93
pool exec: 9
2024/08/02 23:06:20 hello,world21
pool exec: 8
2024/08/02 23:06:20 hello,world92
pool exec: 1
2024/08/02 23:06:20 hello,world23
pool exec: 5
2024/08/02 23:06:20 hello,world22
pool exec: 3
2024/08/02 23:06:20 hello,world20
pool exec: 8
2024/08/02 23:06:20 hello,world25
pool exec: 1
2024/08/02 23:06:20 hello,world91
2024/08/02 23:06:20 hello,world89
pool exec: 6
2024/08/02 23:06:20 hello,world88
pool exec: 6
2024/08/02 23:06:20 hello,world66
pool exec: 6
2024/08/02 23:06:20 hello,world87
pool exec: 9
2024/08/02 23:06:20 hello,world27
pool exec: 4
2024/08/02 23:06:20 hello,world73
pool exec: 4
2024/08/02 23:06:20 hello,world18
pool exec: 1
2024/08/02 23:06:20 hello,world72
pool exec: 6
pool exec: 9
2024/08/02 23:06:20 hello,world30
pool exec: 5
pool exec: 0
2024/08/02 23:06:20 hello,world81
pool exec: 7
2024/08/02 23:06:20 hello,world68
pool exec: 2
2024/08/02 23:06:20 hello,world74
2024/08/02 23:06:20 hello,world67
pool exec: 3
pool exec: 0
2024/08/02 23:06:20 hello,world79
2024/08/02 23:06:20 hello,world85
2024/08/02 23:06:20 hello,world19
pool exec: 3
2024/08/02 23:06:20 hello,world86
pool exec: 4
2024/08/02 23:06:20 hello,world71
2024/08/02 23:06:20 hello,world77
pool exec: 3
2024/08/02 23:06:20 hello,world84
pool exec: 0
2024/08/02 23:06:20 hello,world83
pool exec: 8
pool exec: 9
2024/08/02 23:06:20 hello,world78
pool exec: 4
2024/08/02 23:06:20 hello,world69
pool exec: 2
pool exec: 6
2024/08/02 23:06:20 hello,world76
pool exec: 9
pool exec: 4
2024/08/02 23:06:20 hello,world63
pool exec: 9
2024/08/02 23:06:20 hello,world65
pool exec: 8
2024/08/02 23:06:20 hello,world60
pool exec: 4
2024/08/02 23:06:20 hello,world80
pool exec: 7
2024/08/02 23:06:20 hello,world59
pool exec: 4
2024/08/02 23:06:20 hello,world13
pool exec: 9
2024/08/02 23:06:20 hello,world75
2024/08/02 23:06:20 hello,world16
pool exec: 0
2024/08/02 23:06:20 hello,world15
pool exec: 0
2024/08/02 23:06:20 hello,world14
pool exec: 0
2024/08/02 23:06:20 hello,world11
pool exec: 0
2024/08/02 23:06:20 hello,world58
pool exec: 1
2024/08/02 23:06:20 hello,world82
pool exec: 9
pool exec: 5
2024/08/02 23:06:20 hello,world10
pool exec: 9
2024/08/02 23:06:20 hello,world0
pool exec: 7
pool exec: 0
2024/08/02 23:06:20 hello,world8
pool exec: 7
2024/08/02 23:06:20 hello,world7
2024/08/02 23:06:20 hello,world62
pool exec: 9
pool exec: 2
2024/08/02 23:06:20 hello,world9
pool exec: 2
2024/08/02 23:06:20 hello,world2
pool exec: 2
2024/08/02 23:06:20 hello,world4
pool exec: 9
2024/08/02 23:06:20 hello,world3
pool exec: 9
2024/08/02 23:06:20 hello,world100
pool exec: 9
pool exec: 9
pool exec: 9
2024/08/02 23:06:20 hello,world5
pool exec: 9
pool exec: 9
2024/08/02 23:06:20 hello,world1
pool exec: 9
2024/08/02 23:06:20 hello,world64
pool exec: 0
2024/08/02 23:06:20 hello,world61
pool exit 8
2024/08/02 23:06:20 hello,world70
pool exec: 2
pool exit 2
2024/08/02 23:06:20 hello,world17
pool exit 0
2024/08/02 23:06:20 hello,world12
pool exit 4
2024/08/02 23:06:20 hello,world6
pool exit 7
pool exit 3
pool exec: 9
pool exit 9
pool exit 1
pool exec: 5
pool exit 5
pool exit 6
--- PASS: TestPool (1.00s)
PASS