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Merge pull request #192 from CodaFi/amdahls-law
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Amdahls Law
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@CodaFi
CodaFi committed May 14, 2015
2 parents 9a1425b + 262d526 commit 00b000c
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23 changes: 0 additions & 23 deletions README.md
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Expand Up @@ -227,29 +227,6 @@ let left = divideLeftMultiplyRight.apply(Either.left(4)) // 2
let right = divideLeftMultiplyRight.apply(Either.right(7)) // 14
```

**Concurrency**

```swift
import class Swiftz.Chan

//: A Channel is an unbounded FIFO stream of values with special semantics
//: for reads and writes.
let chan : Chan<Int> = Chan()

//: All writes to the Channel always succeed. The Channel now contains `1`.
chan.write(1) // happens immediately

//: Reads to non-empty Channels occur immediately. The Channel is now empty.
let x1 = chan.read()

//: But if we read from an empty Channel the read blocks until we write to the Channel again.
dispatch_after(dispatch_time(DISPATCH_TIME_NOW, 1 * Double(NSEC_PER_SEC)), dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_HIGH, 0), {
chan.write(2) // Causes the read to suceed and unblocks the reading thread.
})

let x2 = chan.read() // Blocks until the dispatch block is executed and the Channel becomes non-empty.
```

Operators
---------

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24 changes: 0 additions & 24 deletions Swiftz-iOS.xcodeproj/project.pbxproj
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Expand Up @@ -67,17 +67,13 @@
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Expand Down Expand Up @@ -198,17 +194,13 @@
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Expand Down Expand Up @@ -273,7 +265,6 @@
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Expand Down Expand Up @@ -412,17 +403,6 @@
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Expand Down Expand Up @@ -584,18 +564,14 @@
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Expand Up @@ -14,17 +14,13 @@
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Expand Down Expand Up @@ -297,7 +289,6 @@
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Expand Down Expand Up @@ -415,17 +406,6 @@
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Expand Down Expand Up @@ -649,26 +629,22 @@
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5 changes: 5 additions & 0 deletions Swiftz/Chan.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -18,6 +18,7 @@ public final class Chan<A> {
let cond : UnsafeMutablePointer<pthread_cond_t>
let matt : UnsafeMutablePointer<pthread_mutexattr_t>

@availability(*, deprecated=2.1, message="Concurrency primitives are being moved to Concurrent.framework")
public init() {
self.stream = []
var mattr : UnsafeMutablePointer<pthread_mutexattr_t> = UnsafeMutablePointer.alloc(sizeof(pthread_mutexattr_t))
Expand All @@ -38,6 +39,7 @@ public final class Chan<A> {
}

/// Writes a value to a channel.
@availability(*, deprecated=2.1, message="Concurrency primitives are being moved to Concurrent.framework")
public func write(a : A) {
pthread_mutex_lock(mutex)
stream.append(a)
Expand All @@ -46,6 +48,7 @@ public final class Chan<A> {
}

/// Reads a value from the channel.
@availability(*, deprecated=2.1, message="Concurrency primitives are being moved to Concurrent.framework")
public func read() -> A {
pthread_mutex_lock(mutex)
while (stream.isEmpty) {
Expand All @@ -58,11 +61,13 @@ public final class Chan<A> {
}

/// Write | Writes a value to a channel.
@availability(*, deprecated=2.1, message="Concurrency primitives are being moved to Concurrent.framework")
public func <-<A>(chan : Chan<A>, value : A) -> Void {
chan.write(value)
}

/// Read | Reads a value from the channel.
@availability(*, deprecated=2.1, message="Concurrency primitives are being moved to Concurrent.framework")
public prefix func <-<A>(chan : Chan<A>) -> A {
return chan.read()
}
1 change: 1 addition & 0 deletions Swiftz/ExecutionContext.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -15,5 +15,6 @@ public protocol ExecutionContext {
/// Computes a value for a Future given a work block.
///
/// When work concludes this function must execute Future.sig(_:) to fulfill the Future.
@availability(*, deprecated=2.1, message="Concurrency primitives are being moved to Concurrent.framework")
func submit<A>(x: Future<A>, work: () -> A)
}
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