work around #32087 by polling for I/O on windows inside thread loops (#32109)

JeffBezanson · KristofferC · commit ad5e60ad56ce · 2019-05-23T22:06:41.000+02:00
(cherry picked from commit 4247a48)
diff --git a/src/partr.c b/src/partr.c
@@ -303,7 +303,11 @@ JL_DLLEXPORT jl_task_t *jl_task_get_next(jl_value_t *getsticky)
                 }
                 uv_loop_t *loop = jl_global_event_loop();
                 loop->stop_flag = 0;
+#ifdef _OS_WINDOWS_
+                uv_run(loop, UV_RUN_NOWAIT);
+#else
                 uv_run(loop, UV_RUN_ONCE);
+#endif
                 JL_UV_UNLOCK();
             }
             else {

Original file line number	Diff line number	Diff line change
`@@ -303,7 +303,11 @@ JL_DLLEXPORT jl_task_t jl_task_get_next(jl_value_t getsticky)`
`303`	`303`	`}`
`304`	`304`	`uv_loop_t *loop = jl_global_event_loop();`
`305`	`305`	`loop->stop_flag = 0;`
	`306`	`+#ifdef _OS_WINDOWS_`
	`307`	`+ uv_run(loop, UV_RUN_NOWAIT);`
	`308`	`+#else`
`306`	`309`	`uv_run(loop, UV_RUN_ONCE);`
	`310`	`+#endif`
`307`	`311`	`JL_UV_UNLOCK();`
`308`	`312`	`}`
`309`	`313`	`else {`