fmt.Fprintf is fine for concurrent use if you use it properly. It does a single write system call to the output once the result is created. C does not guarantee that, if that's how you came to think it unsafe.
The same applies to log.Printf. -rob On Thu, Oct 19, 2017 at 6:48 AM, Alex Buchanan <buchanae.o...@gmail.com> wrote: > You mean fmt.Fprintf right? Formatting a string without writing to a > io.Writer (fmt.Sprintf) must be safe for concurrent use. > > The "log" package should be safe for concurrent use, and has a Printf > function: > https://godoc.org/log#Logger > > """ > A Logger represents an active logging object that generates lines of > output to an io.Writer. Each logging operation makes a single call to the > Writer's Write method. A Logger can be used simultaneously from multiple > goroutines; it guarantees to serialize access to the Writer. > """ > > On Wednesday, October 18, 2017 at 12:18:10 PM UTC-7, David Renne wrote: >> >> I had a question that I cant seem to figure out. I know fmt is a bad >> package to use if you have any concurrent workers because it uses f.Write() >> and is not thread safe apparently. >> >> But I like using Sprintf because I can format strings and return as a >> string. How can I implement something to use the log package in a manner >> that I can have a concurrently safe log function which acts like Sprintf()? >> >> It's just so strange to me and I have always been curious of why there >> isnt a log.Sprintf(). >> > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
