Created
March 10, 2013 06:14
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This demonstrates usage of the log package in go. Log to stderr or a file.
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| package main | |
| import ( | |
| "os" | |
| "log" | |
| "time" | |
| ) | |
| func main() { | |
| logfile, err := os.OpenFile("test.log", | |
| os.O_RDWR|os.O_APPEND|os.O_CREATE, 0644) | |
| if err != nil { | |
| panic("failed to open log file") | |
| } | |
| defer logfile.Close() | |
| log.SetOutput(logfile) // comment this then it'll write to stderr | |
| for { | |
| log.Println("this is a log") // > test.log | |
| time.Sleep(5000 * time.Millisecond) | |
| } | |
| } |
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| package main | |
| import ( | |
| "os" | |
| "log" | |
| "time" | |
| ) | |
| func main() { | |
| logfile, err := os.OpenFile("test.log", | |
| os.O_RDWR|os.O_APPEND|os.O_CREATE, 0644) | |
| if err != nil { | |
| panic("failed to open log file") | |
| } | |
| defer logfile.Close() | |
| logger := log.New(logfile, "[test] ", log.LstdFlags) | |
| for { | |
| log.Println("this is a log") // > stderr | |
| logger.Println("this is a log") // > test.log | |
| time.Sleep(5000 * time.Millisecond) | |
| } | |
| } |
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The log package uses a mutex to sync between goroutines so that it can be called from a large number of goroutines. It won't cause a "pthread_create failed" error. This is different from the fmt package.