misc/cgo/test: add retry loop around pthread_create in TestSigprocmask

This is the same retry loop we use in _cgo_try_pthread_create in runtime/cgo.

Fixes #25078

Change-Id: I7ef4d4fc7fb89cbfb674c4f93cbdd7a033dd8983
Reviewed-on: https://go-review.googlesource.com/121096
Run-TryBot: Ian Lance Taylor <iant@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

diff --git a/misc/cgo/test/sigprocmask.c b/misc/cgo/test/sigprocmask.c
index bd99647d2b386476eedb996430b29d6fa79a1b96..e77ba5b08ea96de5283b62ddaac841a3c1cac69c 100644 (file)
--- a/misc/cgo/test/sigprocmask.c
+++ b/misc/cgo/test/sigprocmask.c
@@ -4,10 +4,12 @@
 
 // +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();
@@ -28,11 +30,22 @@ static void* sigthreadfunc(void* unused) {
 }
 
 int RunSigThread() {
+       int tries;
        pthread_t thread;
        int r;
+       struct timespec ts;
 
-       r = pthread_create(&thread, NULL, &sigthreadfunc, NULL);
-       if (r != 0)
-               return r;
-       return pthread_join(thread, NULL);
+       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;
 }