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Delete all the documentation from std::task that references linked
failure.
Tweak TaskBuilder to be more builder-like. .name() is now .named() and
.add_wrapper() is now .with_wrapper(). Remove .watched() and
.unwatched() as they didn't actually do anything.
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This better reflects its purpose and design.
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This automatically unlocks its lock when it goes out of scope, and
provides a safe(ish) method to call .wait.
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Instead, use an enum to allow running both a procedure and sending the task
result over a channel. I expect the common case to be sending on a channel (e.g.
task::try), so don't require an extra allocation in the common case.
cc #11389
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Declare a `type SendStr = MaybeOwned<'static>` to ease readibility of
types that needed the old SendStr behavior.
Implement all the traits for MaybeOwned that SendStr used to implement.
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Now that extra::sync primitives are built on a proper mutex instead of a
pthreads one, there's no longer any use for this function.
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`Times::times` was always a second-class loop because it did not support the `break` and `continue` operations. Its playful appeal was then lost after `do` was disabled for closures. It's time to let this one go.
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We just approximate with a 2MB stack for native::start.
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This will allow capturing of common things like logging messages, stdout prints
(using stdio println), and failure messages (printed to stderr). Any new prints
added to libstd should be funneled through these task handles to allow capture
as well.
Additionally, this commit redirects logging back through a `Logger` trait so the
log level can be usefully consumed by an arbitrary logger.
This commit also introduces methods to set the task-local stdout handles:
* std::io::stdio::set_stdout
* std::io::stdio::set_stderr
* std::io::logging::set_logger
These methods all return the previous logger just in case it needs to be used
for inspection.
I plan on using this infrastructure for extra::test soon, but we don't quite
have the primitives that I'd like to use for it, so it doesn't migrate
extra::test at this time.
Closes #6369
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We just approximate with a 1 or 2 MB stack for native::start.
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This will allow capturing of common things like logging messages, stdout prints
(using stdio println), and failure messages (printed to stderr). Any new prints
added to libstd should be funneled through these task handles to allow capture
as well.
Additionally, this commit redirects logging back through a `Logger` trait so the
log level can be usefully consumed by an arbitrary logger.
This commit also introduces methods to set the task-local stdout handles:
* std::io::stdio::set_stdout
* std::io::stdio::set_stderr
* std::io::logging::set_logger
These methods all return the previous logger just in case it needs to be used
for inspection.
I plan on using this infrastructure for extra::test soon, but we don't quite
have the primitives that I'd like to use for it, so it doesn't migrate
extra::test at this time.
Closes #6369
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There was a scheduling race where a child may not increment the global task
count before the parent exits, and the parent would then think that there are no
more tasks left.
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This allows inspection of the current task's bounds regardless of what the
underlying task is.
Closes #11293
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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).
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This is a very real problem with cvars on normal systems, and all of channels
will not work if spurious wakeups are accepted. This problem is just solved with
a synchronized flag (accessed in the cvar's lock) to see whether a signal()
actually happened or whether it's spurious.
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There was a race in the code previously where schedulers would *immediately*
shut down after spawning the main task (because the global task count would
still be 0). This fixes the logic by blocking the sched pool task in receving on
a port instead of spawning a task into the pool to receive on a port.
The modifications necessary were to have a "simple task" running by the time the
code is executing, but this is a simple enough thing to implement and I forsee
this being necessary to have implemented in the future anyway.
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The scheduler pool now has a much more simplified interface. There is now a
clear distinction between creating the pool and then interacting the pool. When
a pool is created, all schedulers are not active, and only later if a spawn is
done does activity occur.
There are four operations that you can do on a pool:
1. Create a new pool. The only argument to this function is the configuration
for the scheduler pool. Currently the only configuration parameter is the
number of threads to initially spawn.
2. Spawn a task into this pool. This takes a procedure and task configuration
options and spawns a new task into the pool of schedulers.
3. Spawn a new scheduler into the pool. This will return a handle on which to
communicate with the scheduler in order to do something like a pinned task.
4. Shut down the scheduler pool. This will consume the scheduler pool, request
all of the schedulers to shut down, and then wait on all the scheduler
threads. Currently this will block the invoking OS thread, but I plan on
making 'Thread::join' not a thread-blocking call.
These operations can be used to encode all current usage of M:N schedulers, as
well as providing a simple interface through which a pool can be modified. There
is currently no way to remove a scheduler from a pool of scheduler, as there's
no way to guarantee that a scheduler has exited. This may be added in the
future, however (as necessary).
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This adds a few smoke tests associated with libnative tasks (not much code to
test here anyway), and cleans up the entry points a little bit to be a little
more like libgreen.
The I/O code doesn't need much testing because that's all tested in libstd (with
the iotest! macro).
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This commit brings the library up-to-date in order to get all tests passing
again
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This commit introduces a new crate called "native" which will be the crate that
implements the 1:1 runtime of rust. This currently entails having an
implementation of std::rt::Runtime inside of libnative as well as moving all of
the native I/O implementations to libnative.
The current snag is that the start lang item must currently be defined in
libnative in order to start running, but this will change in the future.
Cool fact about this crate, there are no extra features that are enabled.
Note that this commit does not include any makefile support necessary for
building libnative, that's all coming in a later commit.
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