From: Alexandre Oliva <oliva@adacore.com>
Date: Fri, 24 Jun 2022 02:20:46 +0000 (-0300)
Subject: libstdc++: testsuite: tolerate non-cancelling sleep
X-Git-Tag: basepoints/gcc-14~5976
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0b2c1781db8df9051ce3d160af2113387742fef2;p=thirdparty%2Fgcc.git

libstdc++: testsuite: tolerate non-cancelling sleep

Though sleep, nanosleep and clock_nanosleep are all POSIX cancellation
points, not all target systems follow this POSIX requirement.
30_threads/thread/native_handle/cancel.cc will run until it times out
on such systems.

Rather than failing a C++ library test because of a limitation of the
target system, this patch gives the test a chance to successfully
exercise the features it intends to exercise, by introducing a
cancellation point in a loop that would otherwise run indefinitely on
systems exhibiting this limitation.


for  libstdc++-v3/ChangeLog

	* testsuite/30_threads/thread/native_handle/cancel.cc: Add an
	explicit cancellation point in case sleep_for lacks one.
---

diff --git a/libstdc++-v3/testsuite/30_threads/thread/native_handle/cancel.cc b/libstdc++-v3/testsuite/30_threads/thread/native_handle/cancel.cc
index dca162b3ace1..3cef97e8c53d 100644
--- a/libstdc++-v3/testsuite/30_threads/thread/native_handle/cancel.cc
+++ b/libstdc++-v3/testsuite/30_threads/thread/native_handle/cancel.cc
@@ -30,7 +30,11 @@ void f(std::atomic<bool>& started)
 {
   started = true;
   while (true)
-    std::this_thread::sleep_for(std::chrono::milliseconds(100));
+    {
+      std::this_thread::sleep_for(std::chrono::milliseconds(100));
+      // In case the target system doesn't make sleep a cancellation point...
+      pthread_testcancel();
+    }
 }
 
 int main()