1 files changed, 51 insertions, 0 deletions
diff --git a/src/cmd/cgo/internal/test/sigprocmask.c b/src/cmd/cgo/internal/test/sigprocmask.c
new file mode 100644
index 0000000..4315833
--- /dev/null
+++ b/src/cmd/cgo/internal/test/sigprocmask.c
@@ -0,0 +1,51 @@
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !windows
+
+#include <errno.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <pthread.h>
+#include <stdio.h>
+#include <time.h>
+#include <unistd.h>
+
+extern void IntoGoAndBack();
+
+int CheckBlocked() {
+	sigset_t mask;
+	sigprocmask(SIG_BLOCK, NULL, &mask);
+	return sigismember(&mask, SIGIO);
+}
+
+static void* sigthreadfunc(void* unused) {
+	sigset_t mask;
+	sigemptyset(&mask);
+	sigaddset(&mask, SIGIO);
+	sigprocmask(SIG_BLOCK, &mask, NULL);
+	IntoGoAndBack();
+	return NULL;
+}
+
+int RunSigThread() {
+	int tries;
+	pthread_t thread;
+	int r;
+	struct timespec ts;
+
+	for (tries = 0; tries < 20; tries++) {
+		r = pthread_create(&thread, NULL, &sigthreadfunc, NULL);
+		if (r == 0) {
+			return pthread_join(thread, NULL);
+		}
+		if (r != EAGAIN) {
+			return r;
+		}
+		ts.tv_sec = 0;
+		ts.tv_nsec = (tries + 1) * 1000 * 1000; // Milliseconds.
+		nanosleep(&ts, NULL);
+	}
+	return EAGAIN;
+}