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TLS helpers to ease Windows support #10

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Merged
merged 1 commit into from
Oct 23, 2020
Merged

TLS helpers to ease Windows support #10

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32 changes: 23 additions & 9 deletions Sources/SystemInternals/Mocking.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -91,20 +91,37 @@ import Glibc
#error("Unsupported Platform")
#endif

internal let key: pthread_key_t = {
// TLS helper functions
#if !os(Windows)
internal typealias TLSKey = pthread_key_t
internal func makeTLSKey() -> TLSKey {
var raw = pthread_key_t()
guard 0 == pthread_key_create(&raw, nil) else {
fatalError("Unable to create key")
}
return raw
}()
}
internal func setTLS(_ key: TLSKey, _ p: UnsafeMutableRawPointer?) {
guard 0 == pthread_setspecific(key, p) else {
fatalError("Unable to set TLS")
}
}
internal func getTLS(_ key: TLSKey) -> UnsafeMutableRawPointer? {
pthread_getspecific(key)
}
#else
// TODO: Windows version...
#error("Unsupported Platform")
#endif

private let driverKey: TLSKey = { makeTLSKey() }()

internal var currentMockingDriver: MockingDriver? {
#if !ENABLE_MOCKING
fatalError("Contextual mocking in non-mocking build")
#endif

guard let rawPtr = pthread_getspecific(key) else { return nil }
guard let rawPtr = getTLS(driverKey) else { return nil }

return Unmanaged<MockingDriver>.fromOpaque(rawPtr).takeUnretainedValue()
}
Expand All @@ -120,17 +137,14 @@ extension MockingDriver {

defer {
if let object = priorMocking {
pthread_setspecific(key, Unmanaged.passUnretained(object).toOpaque())
setTLS(driverKey, Unmanaged.passUnretained(object).toOpaque())
} else {
pthread_setspecific(key, nil)
setTLS(driverKey, nil)
}
_fixLifetime(driver)
}

guard 0 == pthread_setspecific(key, Unmanaged.passUnretained(driver).toOpaque()) else {
fatalError("Unable to set TLSData")
}

setTLS(driverKey, Unmanaged.passUnretained(driver).toOpaque())
return try f(driver)
}
}
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