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[SR-2938] Random SwiftShims functionality not working on Linux #45532

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colemancda opened this issue Oct 13, 2016 · 2 comments
Closed

[SR-2938] Random SwiftShims functionality not working on Linux #45532

colemancda opened this issue Oct 13, 2016 · 2 comments
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella

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@colemancda
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Previous ID SR-2938
Radar None
Original Reporter @colemancda
Type Bug
Status Closed
Resolution Won't Do
Environment

Ubuntu 14.04 LTS with Swift 3.0 Release

Additional Detail from JIRA
Votes 0
Component/s Standard Library
Labels Bug
Assignee None
Priority Medium

md5: 1eacea1891d48d8fd5267afda8e5bfb7

Issue Description:

_swift_stdlib_cxx11_mt19937_uniform is not generating a random value on Linux.

Code for testing:

// Import standard C library
#if os(macOS) || os(iOS)
import Darwin.C
#else
import SwiftShims
import Glibc
#endif

let upperBound: UInt32 = 10

let randomValue: UInt32

#if os(Linux)
randomValue = _swift_stdlib_cxx11_mt19937_uniform(upperBound)
#else
randomValue = arc4random_uniform(upperBound)
#endif

print("Random number:", randomValue)
@belkadan
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cc @airspeedswift

@airspeedswift
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This is present only for Swift std lib unit testing purposes and is not meant to be called directly (hence the _ at the start). It needs seeding before it generates random numbers.

@swift-ci swift-ci transferred this issue from apple/swift-issues Apr 25, 2022
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bug A deviation from expected or documented behavior. Also: expected but undesirable behavior. standard library Area: Standard library umbrella
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3 participants
@belkadan @colemancda @airspeedswift