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SystemInternals: support mocking on Windows #9

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SystemInternals: support mocking on Windows #9

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31 changes: 31 additions & 0 deletions Sources/SystemInternals/Mocking.swift
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Original file line number Diff line number Diff line change
Expand Up @@ -87,24 +87,41 @@ public class MockingDriver {
import Darwin
#elseif os(Linux) || os(FreeBSD) || os(Android)
import Glibc
#elseif os(Windows)
import ucrt
import WinSDK
#else
#error("Unsupported Platform")
#endif

#if os(Windows)
internal let key: DWORD = {
var raw: DWORD = FlsAlloc(nil)
if raw == FLS_OUT_OF_INDEXES {
fatalError("Unable to create key")
}
return raw
}()
#else
internal let key: pthread_key_t = {
var raw = pthread_key_t()
guard 0 == pthread_key_create(&raw, nil) else {
fatalError("Unable to create key")
}
return raw
}()
#endif

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

#if os(Windows)
guard let rawPtr = FlsGetValue(key) else { return nil }
#else
guard let rawPtr = pthread_getspecific(key) else { return nil }
#endif

return Unmanaged<MockingDriver>.fromOpaque(rawPtr).takeUnretainedValue()
}
Expand All @@ -120,16 +137,30 @@ extension MockingDriver {

defer {
if let object = priorMocking {
#if os(Windows)
_ = FlsSetValue(key, Unmanaged.passUnretained(object).toOpaque())
#else
pthread_setspecific(key, Unmanaged.passUnretained(object).toOpaque())
#endif
} else {
#if os(Windows)
_ = FlsSetValue(key, nil)
#else
pthread_setspecific(key, nil)
#endif
}
_fixLifetime(driver)
}

#if os(Windows)
guard FlsSetValue(key, Unmanaged.passUnretained(driver).toOpaque()) else {
fatalError("Unable to set TLSData")
}
#else
guard 0 == pthread_setspecific(key, Unmanaged.passUnretained(driver).toOpaque()) else {
fatalError("Unable to set TLSData")
}
#endif

return try f(driver)
}
Expand Down