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[Concurrency] Reference dispatch_async_swift_job directly when the header is available. #73945

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Merged
merged 1 commit into from
May 29, 2024
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[Concurrency] Reference dispatch_async_swift_job directly when the header is available. #73945

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10 changes: 9 additions & 1 deletion stdlib/public/Concurrency/DispatchGlobalExecutor.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -33,6 +33,11 @@
#endif
#endif

#if __has_include(<dispatch/private.h>)
#include <dispatch/private.h>
#define SWIFT_CONCURRENCY_HAS_DISPATCH_PRIVATE 1
#endif

// Ensure that Job's layout is compatible with what Dispatch expects.
// Note: MinimalDispatchObjectHeader just has the fields we care about, it is
// not complete and should not be used for anything other than these asserts.
Expand Down Expand Up @@ -89,7 +94,10 @@ static void initializeDispatchEnqueueFunc(dispatch_queue_t queue, void *obj,
// Always fall back to plain dispatch_async_f for back-deployed concurrency.
#if !defined(SWIFT_CONCURRENCY_BACK_DEPLOYMENT)
if (runtime::environment::concurrencyEnableJobDispatchIntegration())
#if defined(_WIN32)
#if SWIFT_CONCURRENCY_HAS_DISPATCH_PRIVATE
if (SWIFT_RUNTIME_WEAK_CHECK(dispatch_async_swift_job))
func = SWIFT_RUNTIME_WEAK_USE(dispatch_async_swift_job);
#elif defined(_WIN32)
func = reinterpret_cast<dispatchEnqueueFuncType>(
GetProcAddress(LoadLibraryW(L"dispatch.dll"),
"dispatch_async_swift_job"));
Expand Down