jonkeane commented on code in PR #49996:
URL: https://github.com/apache/arrow/pull/49996#discussion_r3273907715
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r/src/safe-call-into-r-impl.cpp:
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@@ -45,7 +45,16 @@ bool SetEnableSignalStopSource(bool enabled) {
}
// [[arrow::export]]
-bool CanRunWithCapturedR() { return MainRThread::GetInstance().Executor() ==
nullptr; }
+bool CanRunWithCapturedR() {
+#ifdef __EMSCRIPTEN__
+ // Threading is not supported under Emscripten/WASM. Always take the
+ // synchronous path to avoid attempting pthread_create which will fail
+ // with "thread constructor failed: Not supported".
+ return false;
+#else
+ return MainRThread::GetInstance().Executor() == nullptr;
+#endif
Review Comment:
Is it possible to add a test (or maybe it's that we actually need to run the
tests under wasm(???) to catch this?
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