rust/src/libstd/rt/local.rs, branch beta

std: Extract librustrt out of libstd

2014-06-07T05:19:41+00:00

As part of the libstd facade efforts, this commit extracts the runtime interface out of the standard library into a standalone crate, librustrt. This crate will provide the following services: * Definition of the rtio interface * Definition of the Runtime interface * Implementation of the Task structure * Implementation of task-local-data * Implementation of task failure via unwinding via libunwind * Implementation of runtime initialization and shutdown * Implementation of thread-local-storage for the local rust Task Notably, this crate avoids the following services: * Thread creation and destruction. The crate does not require the knowledge of an OS threading system, and as a result it seemed best to leave out the `rt::thread` module from librustrt. The librustrt module does depend on mutexes, however. * Implementation of backtraces. There is no inherent requirement for the runtime to be able to generate backtraces. As will be discussed later, this functionality continues to live in libstd rather than librustrt. As usual, a number of architectural changes were required to make this crate possible. Users of "stable" functionality will not be impacted by this change, but users of the `std::rt` module will likely note the changes. A list of architectural changes made is: * The stdout/stderr handles no longer live directly inside of the `Task` structure. This is a consequence of librustrt not knowing about `std::io`. These two handles are now stored inside of task-local-data. The handles were originally stored inside of the `Task` for perf reasons, and TLD is not currently as fast as it could be. For comparison, 100k prints goes from 59ms to 68ms (a 15% slowdown). This appeared to me to be an acceptable perf loss for the successful extraction of a librustrt crate. * The `rtio` module was forced to duplicate more functionality of `std::io`. As the module no longer depends on `std::io`, `rtio` now defines structures such as socket addresses, addrinfo fiddly bits, etc. The primary change made was that `rtio` now defines its own `IoError` type. This type is distinct from `std::io::IoError` in that it does not have an enum for what error occurred, but rather a platform-specific error code. The native and green libraries will be updated in later commits for this change, and the bulk of this effort was put behind updating the two libraries for this change (with `rtio`). * Printing a message on task failure (along with the backtrace) continues to live in libstd, not in librustrt. This is a consequence of the above decision to move the stdout/stderr handles to TLD rather than inside the `Task` itself. The unwinding API now supports registration of global callback functions which will be invoked when a task fails, allowing for libstd to register a function to print a message and a backtrace. The API for registering a callback is experimental and unsafe, as the ramifications of running code on unwinding is pretty hairy. * The `std::unstable::mutex` module has moved to `std::rt::mutex`. * The `std::unstable::sync` module has been moved to `std::rt::exclusive` and the type has been rewritten to not internally have an Arc and to have an RAII guard structure when locking. Old code should stop using `Exclusive` in favor of the primitives in `libsync`, but if necessary, old code should port to `Arc>`. * The local heap has been stripped down to have fewer debugging options. None of these were tested, and none of these have been used in a very long time. [breaking-change]

std: Remove run_in_bare_thread

2014-05-15T20:50:50+00:00

librustc: Remove `~EXPR`, `~TYPE`, and `~PAT` from the language, except

2014-05-07T06:12:54+00:00

for `~str`/`~[]`. Note that `~self` still remains, since I forgot to add support for `Box` before the snapshot. How to update your code: * Instead of `~EXPR`, you should write `box EXPR`. * Instead of `~TYPE`, you should write `Box`. * Instead of `~PATTERN`, you should write `box PATTERN`. [breaking-change]

Replace most ~exprs with 'box'. #11779

2014-05-03T06:00:58+00:00

Publicise types/add #[allow(visible_private_types)] to a variety of places.

2014-02-28T13:12:34+00:00

There's a lot of these types in the compiler libraries, and a few of the older or private stdlib ones. Some types are obviously meant to be public, others not so much.

Removing do keyword from libstd and librustc

2014-01-29T14:15:41+00:00

Fix some warnings

2014-01-06T02:52:52+00:00

Move task count bookeeping out of libstd

2014-01-01T21:08:09+00:00

For libgreen, bookeeping should not be global but rather on a per-pool basis. Inside libnative, it's known that there must be a global counter with a mutex/cvar. The benefit of taking this strategy is to remove this functionality from libstd to allow fine-grained control of it through libnative/libgreen. Notably, helper threads in libnative can manually decrement the global count so they don't count towards the global count of threads. Also, the shutdown process of *all* sched pools is now dependent on the number of tasks in the pool being 0 rather than this only being a hardcoded solution for the initial sched pool in libgreen. This involved adding a Local::try_take() method on the Local trait in order for the channel wakeup to work inside of libgreen. The channel send was happening from a SchedTask when there is no Task available in TLS, and now this is possible to work (remote wakeups are always possible, just a little slower).

std: Get stdtest all passing again

2013-12-25T03:59:52+00:00

This commit brings the library up-to-date in order to get all tests passing again

green: Rip the bandaid off, introduce libgreen

2013-12-25T03:59:52+00:00

This extracts everything related to green scheduling from libstd and introduces a new libgreen crate. This mostly involves deleting most of std::rt and moving it to libgreen. Along with the movement of code, this commit rearchitects many functions in the scheduler in order to adapt to the fact that Local::take now *only* works on a Task, not a scheduler. This mostly just involved threading the current green task through in a few locations, but there were one or two spots where things got hairy. There are a few repercussions of this commit: * tube/rc have been removed (the runtime implementation of rc) * There is no longer a "single threaded" spawning mode for tasks. This is now encompassed by 1:1 scheduling + communication. Convenience methods have been introduced that are specific to libgreen to assist in the spawning of pools of schedulers.