auto merge of #11939 : JeremyLetang/rust/move-libsync, r=alexcrichton

This time everything should be okay, No break due to a failed merge or rebase...

Sorry for the abuse of pull request.

So this move extra::sync, extra::arc, extra::future, extra::comm and extra::task_pool to libsync.

Author: bors

mk/crates.mk

@@ -49,25 +49,26 @@
 # automatically generated for all stage/host/target combinations.
 ################################################################################
 
-TARGET_CRATES := std extra green rustuv native flate arena glob term semver uuid
+TARGET_CRATES := std extra green rustuv native flate arena glob term semver uuid sync
 HOST_CRATES := syntax rustc rustdoc
 CRATES := $(TARGET_CRATES) $(HOST_CRATES)
 TOOLS := compiletest rustdoc rustc
 
 DEPS_std := native:rustrt
-DEPS_extra := std term
+DEPS_extra := std term sync
 DEPS_green := std
 DEPS_rustuv := std native:uv native:uv_support
 DEPS_native := std
 DEPS_syntax := std extra term
-DEPS_rustc := syntax native:rustllvm flate arena
-DEPS_rustdoc := rustc native:sundown
+DEPS_rustc := syntax native:rustllvm flate arena sync
+DEPS_rustdoc := rustc native:sundown sync
 DEPS_flate := std native:miniz
 DEPS_arena := std extra
 DEPS_glob := std
 DEPS_term := std
 DEPS_semver := std
 DEPS_uuid := std extra
+DEPS_sync := std
 
 TOOL_DEPS_compiletest := extra green rustuv
 TOOL_DEPS_rustdoc := rustdoc green rustuv

src/doc/guide-tasks.md

@@ -39,26 +39,51 @@ data through the global _exchange heap_.
 
 While Rust's type system provides the building blocks needed for safe
 and efficient tasks, all of the task functionality itself is implemented
-in the standard and extra libraries, which are still under development
+in the standard and sync libraries, which are still under development
 and do not always present a consistent or complete interface.
 
 For your reference, these are the standard modules involved in Rust
 concurrency at this writing:
 
 * [`std::task`] - All code relating to tasks and task scheduling,
 * [`std::comm`] - The message passing interface,
-* [`extra::comm`] - Additional messaging types based on `std::comm`,
-* [`extra::sync`] - More exotic synchronization tools, including locks,
-* [`extra::arc`] - The Arc (atomically reference counted) type,
-  for safely sharing immutable data,
-* [`extra::future`] - A type representing values that may be computed concurrently and retrieved at a later time.
+* [`sync::DuplexStream`] - An extension of `pipes::stream` that allows both sending and receiving,
+* [`sync::SyncChan`] - An extension of `pipes::stream` that provides synchronous message sending,
+* [`sync::SyncPort`] - An extension of `pipes::stream` that acknowledges each message received,
+* [`sync::rendezvous`] - Creates a stream whose channel, upon sending a message, blocks until the 
+    message is received.
+* [`sync::Arc`] - The Arc (atomically reference counted) type, for safely sharing immutable data,
+* [`sync::RWArc`] - A dual-mode Arc protected by a reader-writer lock,
+* [`sync::MutexArc`] - An Arc with mutable data protected by a blocking mutex,
+* [`sync::Semaphore`] - A counting, blocking, bounded-waiting semaphore,
+* [`sync::Mutex`] - A blocking, bounded-waiting, mutual exclusion lock with an associated 
+    FIFO condition variable,
+* [`sync::RWLock`] - A blocking, no-starvation, reader-writer lock with an associated condvar,
+* [`sync::Barrier`] - A barrier enables multiple tasks to synchronize the beginning
+    of some computation,
+* [`sync::TaskPool`] - A task pool abstraction,
+* [`sync::Future`] - A type encapsulating the result of a computation which may not be complete,
+* [`sync::one`] - A "once initialization" primitive
+* [`sync::mutex`] - A proper mutex implementation regardless of the "flavor of task" which is
+    acquiring the lock.
 
 [`std::task`]: std/task/index.html
 [`std::comm`]: std/comm/index.html
-[`extra::comm`]: extra/comm/index.html
-[`extra::sync`]: extra/sync/index.html
-[`extra::arc`]: extra/arc/index.html
-[`extra::future`]: extra/future/index.html
+[`sync::DuplexStream`]: sync/struct.DuplexStream.html
+[`sync::SyncChan`]: sync/struct.SyncChan.html
+[`sync::SyncPort`]: sync/struct.SyncPort.html
+[`sync::rendezvous`]: sync/fn.rendezvous.html
+[`sync::Arc`]: sync/struct.Arc.html
+[`sync::RWArc`]: sync/struct.RWArc.html
+[`sync::MutexArc`]: sync/struct.MutexArc.html
+[`sync::Semaphore`]: sync/struct.Semaphore.html
+[`sync::Mutex`]: sync/struct.Mutex.html
+[`sync::RWLock`]: sync/struct.RWLock.html
+[`sync::Barrier`]: sync/struct.Barrier.html
+[`sync::TaskPool`]: sync/struct.TaskPool.html
+[`sync::Future`]: sync/struct.Future.html
+[`sync::one`]: sync/one/index.html
+[`sync::mutex`]: sync/mutex/index.html
 
 # Basics
 
@@ -254,21 +279,25 @@ let result = ports.iter().fold(0, |accum, port| accum + port.recv() );
 ~~~
 
 ## Backgrounding computations: Futures
-With `extra::future`, rust has a mechanism for requesting a computation and getting the result
+With `sync::Future`, rust has a mechanism for requesting a computation and getting the result
 later.
 
 The basic example below illustrates this.
 
 ~~~
+# extern mod sync;
+
+# fn main() {
 # fn make_a_sandwich() {};
 fn fib(n: u64) -> u64 {
     // lengthy computation returning an uint
     12586269025
 }
 
-let mut delayed_fib = extra::future::Future::spawn(proc() fib(50));
+let mut delayed_fib = sync::Future::spawn(proc() fib(50));
 make_a_sandwich();
 println!("fib(50) = {:?}", delayed_fib.get())
+# }
 ~~~
 
 The call to `future::spawn` returns immediately a `future` object regardless of how long it
@@ -281,6 +310,7 @@ Here is another example showing how futures allow you to background computations
 be distributed on the available cores.
 
 ~~~
+# extern mod sync;
 # use std::vec;
 fn partial_sum(start: uint) -> f64 {
     let mut local_sum = 0f64;
@@ -291,7 +321,7 @@ fn partial_sum(start: uint) -> f64 {
 }
 
 fn main() {
-    let mut futures = vec::from_fn(1000, |ind| extra::future::Future::spawn( proc() { partial_sum(ind) }));
+    let mut futures = vec::from_fn(1000, |ind| sync::Future::spawn( proc() { partial_sum(ind) }));
 
     let mut final_res = 0f64;
     for ft in futures.mut_iter()  {
@@ -309,16 +339,17 @@ add up to a significant amount of wasted memory and would require copying the sa
 necessary.
 
 To tackle this issue, one can use an Atomically Reference Counted wrapper (`Arc`) as implemented in
-the `extra` library of Rust. With an Arc, the data will no longer be copied for each task. The Arc
+the `sync` library of Rust. With an Arc, the data will no longer be copied for each task. The Arc
 acts as a reference to the shared data and only this reference is shared and cloned.
 
 Here is a small example showing how to use Arcs. We wish to run concurrently several computations on
 a single large vector of floats. Each task needs the full vector to perform its duty.
 
 ~~~
+# extern mod sync;
 # use std::vec;
 # use std::rand;
-use extra::arc::Arc;
+use sync::Arc;
 
 fn pnorm(nums: &~[f64], p: uint) -> f64 {
     nums.iter().fold(0.0, |a,b| a+(*b).powf(&(p as f64)) ).powf(&(1.0 / (p as f64)))
@@ -348,39 +379,48 @@ at the power given as argument and takes the inverse power of this value). The A
 created by the line
 
 ~~~
-# use extra::arc::Arc;
+# extern mod sync;
+# use sync::Arc;
 # use std::vec;
 # use std::rand;
+# fn main() {
 # let numbers = vec::from_fn(1000000, |_| rand::random::<f64>());
 let numbers_arc=Arc::new(numbers);
+# }
 ~~~
 
 and a clone of it is sent to each task
 
 ~~~
-# use extra::arc::Arc;
+# extern mod sync;
+# use sync::Arc;
 # use std::vec;
 # use std::rand;
+# fn main() {
 # let numbers=vec::from_fn(1000000, |_| rand::random::<f64>());
 # let numbers_arc = Arc::new(numbers);
 # let (port, chan)  = Chan::new();
 chan.send(numbers_arc.clone());
+# }
 ~~~
 
 copying only the wrapper and not its contents.
 
 Each task recovers the underlying data by
 
 ~~~
-# use extra::arc::Arc;
+# extern mod sync;
+# use sync::Arc;
 # use std::vec;
 # use std::rand;
+# fn main() {
 # let numbers=vec::from_fn(1000000, |_| rand::random::<f64>());
 # let numbers_arc=Arc::new(numbers);
 # let (port, chan)  = Chan::new();
 # chan.send(numbers_arc.clone());
 # let local_arc : Arc<~[f64]> = port.recv();
 let task_numbers = local_arc.get();
+# }
 ~~~
 
 and can use it as if it were local.
@@ -450,25 +490,27 @@ proceed).
 
 A very common thing to do is to spawn a child task where the parent
 and child both need to exchange messages with each other. The
-function `extra::comm::DuplexStream()` supports this pattern.  We'll
+function `sync::comm::DuplexStream()` supports this pattern.  We'll
 look briefly at how to use it.
 
 To see how `DuplexStream()` works, we will create a child task
 that repeatedly receives a `uint` message, converts it to a string, and sends
 the string in response.  The child terminates when it receives `0`.
 Here is the function that implements the child task:
 
-~~~{.ignore .linked-failure}
-# use extra::comm::DuplexStream;
-# use std::uint;
-fn stringifier(channel: &DuplexStream<~str, uint>) {
-    let mut value: uint;
-    loop {
-        value = channel.recv();
-        channel.send(uint::to_str(value));
-        if value == 0 { break; }
+~~~
+# extern mod sync;
+# fn main() {
+# use sync::DuplexStream;
+    fn stringifier(channel: &DuplexStream<~str, uint>) {
+        let mut value: uint;
+        loop {
+            value = channel.recv();
+            channel.send(value.to_str());
+            if value == 0 { break; }
+        }
     }
-}
+# }
 ~~~~
 
 The implementation of `DuplexStream` supports both sending and
@@ -481,15 +523,15 @@ response itself is simply the stringified version of the received value,
 
 Here is the code for the parent task:
 
-~~~{.ignore .linked-failure}
+~~~
+# extern mod sync;
 # use std::task::spawn;
-# use std::uint;
-# use extra::comm::DuplexStream;
+# use sync::DuplexStream;
 # fn stringifier(channel: &DuplexStream<~str, uint>) {
 #     let mut value: uint;
 #     loop {
 #         value = channel.recv();
-#         channel.send(uint::to_str(value));
+#         channel.send(value.to_str());
 #         if value == 0u { break; }
 #     }
 # }

src/doc/index.md

@@ -43,6 +43,7 @@ li {list-style-type: none; }
 * [The `semver` version collation library](semver/index.html)
 * [The `term` terminal-handling library](term/index.html)
 * [The UUID library](uuid/index.html)
+* [The `sync` library for concurrency-enabled mechanisms and primitives](sync/index.html)
 
 # Tooling
 

src/etc/licenseck.py

@@ -41,7 +41,7 @@
     "libstd/sync/mpsc_queue.rs", # BSD
     "libstd/sync/spsc_queue.rs", # BSD
     "libstd/sync/mpmc_bounded_queue.rs", # BSD
-    "libextra/sync/mpsc_intrusive.rs", # BSD
+    "libsync/sync/mpsc_intrusive.rs", # BSD
 ]
 
 def check_license(name, contents):

src/libextra/lib.rs

@@ -34,17 +34,16 @@ Rust extras are part of the standard Rust distribution.
 #[deny(non_camel_case_types)];
 #[deny(missing_doc)];
 
-// Utility modules
+extern mod sync;
 
-pub mod c_vec;
+#[cfg(stage0)]
+macro_rules! if_ok (
+    ($e:expr) => (match $e { Ok(e) => e, Err(e) => return Err(e) })
+)
 
-// Concurrency
+// Utility modules
 
-pub mod sync;
-pub mod arc;
-pub mod comm;
-pub mod future;
-pub mod task_pool;
+pub mod c_vec;
 
 // Collections
 

src/libextra/workcache.rs

@@ -13,7 +13,7 @@
 use json;
 use json::ToJson;
 use serialize::{Encoder, Encodable, Decoder, Decodable};
-use arc::{Arc,RWArc};
+use sync::{Arc,RWArc};
 use treemap::TreeMap;
 use std::str;
 use std::io;

src/librustc/back/link.rs

@@ -331,7 +331,7 @@ pub mod write {
     }
 
     unsafe fn configure_llvm(sess: Session) {
-        use extra::sync::one::{Once, ONCE_INIT};
+        use sync::one::{Once, ONCE_INIT};
         static mut INIT: Once = ONCE_INIT;
 
         // Copy what clang does by turning on loop vectorization at O2 and

src/librustc/lib.rs

@@ -35,6 +35,7 @@ extern mod extra;
 extern mod flate;
 extern mod arena;
 extern mod syntax;
+extern mod sync;
 
 use back::link;
 use driver::session;

src/librustc/middle/trans/base.rs

@@ -2660,7 +2660,7 @@ pub fn trans_crate(sess: session::Session,
                    output: &Path) -> CrateTranslation {
     // Before we touch LLVM, make sure that multithreading is enabled.
     unsafe {
-        use extra::sync::one::{Once, ONCE_INIT};
+        use sync::one::{Once, ONCE_INIT};
         static mut INIT: Once = ONCE_INIT;
         static mut POISONED: bool = false;
         INIT.doit(|| {

src/librustdoc/html/render.rs

@@ -41,7 +41,7 @@ use std::io::{fs, File, BufferedWriter};
 use std::str;
 use std::vec;
 
-use extra::arc::Arc;
+use sync::Arc;
 use extra::json::ToJson;
 use syntax::ast;
 use syntax::attr;

src/librustdoc/lib.rs

@@ -18,6 +18,7 @@
 extern mod syntax;
 extern mod rustc;
 extern mod extra;
+extern mod sync;
 
 use std::local_data;
 use std::io;

src/libextra/arc.rs renamed to src/libsync/arc.rs

@@ -18,7 +18,7 @@
  * With simple pipes, without Arc, a copy would have to be made for each task.
  *
  * ```rust
- * use extra::arc::Arc;
+ * use sync::Arc;
  * use std::{rand, vec};
  *
  * let numbers = vec::from_fn(100, |i| (i as f32) * rand::random());
@@ -38,7 +38,7 @@
  * ```
  */
 
-#[allow(missing_doc)];
+#[allow(missing_doc, dead_code)];
 
 
 use sync;
@@ -424,7 +424,7 @@ impl<T:Freeze + Send> RWArc<T> {
      * # Example
      *
      * ```rust
-     * use extra::arc::RWArc;
+     * use sync::RWArc;
      *
      * let arc = RWArc::new(1);
      * arc.write_downgrade(|mut write_token| {
@@ -605,7 +605,7 @@ impl<T:Clone+Send+Freeze> Clone for CowArc<T> {
 #[cfg(test)]
 mod tests {
 
-    use arc::*;
+    use super::{Arc, RWArc, MutexArc, CowArc};
 
     use std::task;