more backports

examples/examples/appender-multifile.rs

@@ -0,0 +1,32 @@
+//! This example demonstrates the use of multiple files with
+//! `tracing-appender`'s `RollingFileAppender`
+//!
+use tracing_appender::rolling;
+use tracing_subscriber::fmt::writer::MakeWriterExt;
+
+#[path = "fmt/yak_shave.rs"]
+mod yak_shave;
+
+fn main() {
+    // Log all `tracing` events to files prefixed with `debug`. Since these
+    // files will be written to very frequently, roll the log file every minute.
+    let debug_file = rolling::minutely("./logs", "debug");
+    // Log warnings and errors to a separate file. Since we expect these events
+    // to occur less frequently, roll that file on a daily basis instead.
+    let warn_file = rolling::daily("./logs", "warnings").with_max_level(tracing::Level::WARN);
+    let all_files = debug_file.and(warn_file);
+
+    tracing_subscriber::fmt()
+        .with_writer(all_files)
+        .with_ansi(false)
+        .with_max_level(tracing::Level::TRACE)
+        .init();
+
+    yak_shave::shave_all(6);
+    tracing::info!("sleeping for a minute...");
+
+    std::thread::sleep(std::time::Duration::from_secs(60));
+
+    tracing::info!("okay, time to shave some more yaks!");
+    yak_shave::shave_all(10);
+}

tracing-appender/Cargo.toml

@@ -23,6 +23,7 @@ rust-version = "1.51.0"
 [dependencies]
 crossbeam-channel = "0.5.0"
 time = { version = "0.3", default-features = false, features = ["formatting"] }
+parking_lot = { optional = true, version = "0.11.2" }
 
 [dependencies.tracing-subscriber]
 path = "../tracing-subscriber"

tracing-appender/src/lib.rs

@@ -154,14 +154,14 @@ use crate::non_blocking::{NonBlocking, WorkerGuard};
 
 use std::io::Write;
 
-mod inner;
-
 pub mod non_blocking;
 
 pub mod rolling;
 
 mod worker;
 
+pub(crate) mod sync;
+
 /// Convenience function for creating a non-blocking, off-thread writer.
 ///
 /// See the [`non_blocking` module's docs][non_blocking]'s for more details.