1 // Copyright 2015 The Go Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style
3 // license that can be found in the LICENSE file.
4
5 //go:build !windows
6
7 #include <errno.h>
8 #include <signal.h>
9 #include <stdlib.h>
10 #include <pthread.h>
11 #include <stdio.h>
12 #include <time.h>
13 #include <unistd.h>
14
15 extern void IntoGoAndBack();
16
CheckBlocked()17 int CheckBlocked() {
18 sigset_t mask;
19 sigprocmask(SIG_BLOCK, NULL, &mask);
20 return sigismember(&mask, SIGIO);
21 }
22
sigthreadfunc(void * unused)23 static void* sigthreadfunc(void* unused) {
24 sigset_t mask;
25 sigemptyset(&mask);
26 sigaddset(&mask, SIGIO);
27 sigprocmask(SIG_BLOCK, &mask, NULL);
28 IntoGoAndBack();
29 return NULL;
30 }
31
RunSigThread()32 int RunSigThread() {
33 int tries;
34 pthread_t thread;
35 int r;
36 struct timespec ts;
37
38 for (tries = 0; tries < 20; tries++) {
39 r = pthread_create(&thread, NULL, &sigthreadfunc, NULL);
40 if (r == 0) {
41 return pthread_join(thread, NULL);
42 }
43 if (r != EAGAIN) {
44 return r;
45 }
46 ts.tv_sec = 0;
47 ts.tv_nsec = (tries + 1) * 1000 * 1000; // Milliseconds.
48 nanosleep(&ts, NULL);
49 }
50 return EAGAIN;
51 }
52