[cfe-commits] [libcxxabi] r132644 - /libcxxabi/trunk/test/test_guard.cpp
Nick Lewycky
nicholas at mxc.ca
Sat Jun 4 11:01:24 PDT 2011
Author: nicholas
Date: Sat Jun 4 13:01:24 2011
New Revision: 132644
URL: http://llvm.org/viewvc/llvm-project?rev=132644&view=rev
Log:
Add more tests for cxa_guard methods. This includes our first two tests using
actual threads!
There's no build file for libcxxabi, so I'll tell you that I built it with this:
$ g++-4.6 -pthread -std=gnu++0x test_guard.cpp ../src/cxa_guard.o -o test_guard
Modified:
libcxxabi/trunk/test/test_guard.cpp
Modified: libcxxabi/trunk/test/test_guard.cpp
URL: http://llvm.org/viewvc/llvm-project/libcxxabi/trunk/test/test_guard.cpp?rev=132644&r1=132643&r2=132644&view=diff
==============================================================================
--- libcxxabi/trunk/test/test_guard.cpp (original)
+++ libcxxabi/trunk/test/test_guard.cpp Sat Jun 4 13:01:24 2011
@@ -10,7 +10,9 @@
#include "cxxabi.h"
#include <cassert>
+#include <thread>
+// Ensure that we initialize each variable once and only once.
namespace test1 {
static int run_count = 0;
int increment() {
@@ -32,6 +34,8 @@
}
}
+// When initialization fails, ensure that we try to initialize it again next
+// time.
namespace test2 {
static int run_count = 0;
int increment() {
@@ -52,8 +56,79 @@
}
}
+// Check that we can initialize a second value while initializing a first.
+namespace test3 {
+ int zero() {
+ return 0;
+ }
+
+ int one() {
+ static int b = zero();
+ return 0;
+ }
+
+ void test() {
+ static int a = one();
+ }
+}
+
+// A simple thread test of two threads racing to initialize a variable. This
+// isn't guaranteed to catch any particular threading problems.
+namespace test4 {
+ static int run_count = 0;
+ int increment() {
+ ++run_count;
+ return 0;
+ }
+
+ void helper() {
+ static int a = increment();
+ }
+
+ void test() {
+ std::thread t1(helper), t2(helper);
+ t1.join();
+ t2.join();
+ assert(run_count == 1);
+ }
+}
+
+// Check that we don't re-initialize a static variable even when it's
+// encountered from two different threads.
+namespace test5 {
+ static int run_count = 0;
+ int zero() {
+ ++run_count;
+ return 0;
+ }
+
+ int one() {
+ static int b = zero();
+ return 0;
+ }
+
+ void another_helper() {
+ static int a = one();
+ }
+
+ void helper() {
+ static int a = one();
+ std::thread t(another_helper);
+ t.join();
+ }
+
+ void test() {
+ std::thread t(helper);
+ t.join();
+ assert(run_count == 1);
+ }
+}
+
int main()
{
test1::test();
test2::test();
+ test3::test();
+ test4::test();
+ test5::test();
}
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