1 files changed, 264 insertions, 0 deletions
diff --git a/src/seastar/tests/unit/thread_test.cc b/src/seastar/tests/unit/thread_test.cc
new file mode 100644
index 000000000..9d40d3f2f
--- /dev/null
+++ b/src/seastar/tests/unit/thread_test.cc
@@ -0,0 +1,264 @@
+/*
+ * This file is open source software, licensed to you under the terms
+ * of the Apache License, Version 2.0 (the "License").  See the NOTICE file
+ * distributed with this work for additional information regarding copyright
+ * ownership.  You may not use this file except in compliance with the License.
+ *
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/*
+ * Copyright (C) 2015 Cloudius Systems, Ltd.
+ */
+
+#include <seastar/core/thread.hh>
+#include <seastar/core/do_with.hh>
+#include <seastar/testing/test_case.hh>
+#include <seastar/testing/thread_test_case.hh>
+#include <seastar/core/sstring.hh>
+#include <seastar/core/semaphore.hh>
+#include <seastar/core/do_with.hh>
+#include <seastar/core/loop.hh>
+#include <seastar/core/sleep.hh>
+#include <sys/mman.h>
+#include <sys/signal.h>
+
+#include <valgrind/valgrind.h>
+
+using namespace seastar;
+using namespace std::chrono_literals;
+
+SEASTAR_TEST_CASE(test_thread_1) {
+    return do_with(sstring(), [] (sstring& x) {
+        auto t1 = new thread([&x] {
+            x = "abc";
+        });
+        return t1->join().then([&x, t1] {
+            BOOST_REQUIRE_EQUAL(x, "abc");
+            delete t1;
+        });
+    });
+}
+
+SEASTAR_TEST_CASE(test_thread_2) {
+    struct tmp {
+        std::vector<thread> threads;
+        semaphore sem1{0};
+        semaphore sem2{0};
+        int counter = 0;
+        void thread_fn() {
+            sem1.wait(1).get();
+            ++counter;
+            sem2.signal(1);
+        }
+    };
+    return do_with(tmp(), [] (tmp& x) {
+        auto n = 10;
+        for (int i = 0; i < n; ++i) {
+            x.threads.emplace_back(std::bind(&tmp::thread_fn, &x));
+        }
+        BOOST_REQUIRE_EQUAL(x.counter, 0);
+        x.sem1.signal(n);
+        return x.sem2.wait(n).then([&x, n] {
+            BOOST_REQUIRE_EQUAL(x.counter, n);
+            return parallel_for_each(x.threads.begin(), x.threads.end(), std::mem_fn(&thread::join));
+        });
+    });
+}
+
+SEASTAR_TEST_CASE(test_thread_async) {
+    sstring x = "x";
+    sstring y = "y";
+    auto concat = [] (sstring x, sstring y) {
+        sleep(10ms).get();
+        return x + y;
+    };
+    return async(concat, x, y).then([] (sstring xy) {
+        BOOST_REQUIRE_EQUAL(xy, "xy");
+    });
+}
+
+SEASTAR_TEST_CASE(test_thread_async_immed) {
+    return async([] { return 3; }).then([] (int three) {
+        BOOST_REQUIRE_EQUAL(three, 3);
+    });
+}
+
+SEASTAR_TEST_CASE(test_thread_async_nested) {
+    return async([] {
+        return async([] {
+            return 3;
+        }).get0();
+    }).then([] (int three) {
+        BOOST_REQUIRE_EQUAL(three, 3);
+    });
+}
+
+void compute(float& result, bool& done, uint64_t& ctr) {
+    while (!done) {
+        for (int n = 0; n < 10000; ++n) {
+            result += 1 / (result + 1);
+            ++ctr;
+        }
+        thread::yield();
+    }
+}
+
+#if defined(SEASTAR_ASAN_ENABLED) && defined(SEASTAR_HAVE_ASAN_FIBER_SUPPORT)
+volatile int force_write;
+volatile void* shut_up_gcc;
+
+[[gnu::noinline]]
+void throw_exception() {
+    volatile char buf[1024];
+    shut_up_gcc = &buf;
+    for (int i = 0; i < 1024; i++) {
+        buf[i] = force_write;
+    }
+    throw 1;
+}
+
+[[gnu::noinline]]
+void use_stack() {
+    volatile char buf[2 * 1024];
+    shut_up_gcc = &buf;
+    for (int i = 0; i < 2 * 1024; i++) {
+        buf[i] = force_write;
+    }
+}
+
+SEASTAR_TEST_CASE(test_asan_false_positive) {
+    return async([] {
+        try {
+            throw_exception();
+        } catch (...) {
+            use_stack();
+        }
+    });
+}
+#endif
+
+SEASTAR_THREAD_TEST_CASE_EXPECTED_FAILURES(abc, 2) {
+    BOOST_TEST(false);
+    BOOST_TEST(false);
+}
+
+SEASTAR_TEST_CASE(test_thread_custom_stack_size) {
+    sstring x = "x";
+    sstring y = "y";
+    auto concat = [] (sstring x, sstring y) {
+        sleep(10ms).get();
+        return x + y;
+    };
+    thread_attributes attr;
+    attr.stack_size = 16384;
+    return async(attr, concat, x, y).then([] (sstring xy) {
+        BOOST_REQUIRE_EQUAL(xy, "xy");
+    });
+}
+
+// The test case uses x86_64 specific signal handler info. The test
+// fails with detect_stack_use_after_return=1. We could put it behind
+// a command line option and fork/exec to run it after removing
+// detect_stack_use_after_return=1 from the environment.
+#if defined(SEASTAR_THREAD_STACK_GUARDS) && defined(__x86_64__) && !defined(SEASTAR_ASAN_ENABLED)
+struct test_thread_custom_stack_size_failure : public seastar::testing::seastar_test {
+    const char* get_test_file() const override { return __FILE__; }
+    const char* get_name() const override { return "test_thread_custom_stack_size_failure"; }
+    int get_expected_failures() const override { return 0; } \
+    seastar::future<> run_test_case() const override;
+};
+
+static test_thread_custom_stack_size_failure test_thread_custom_stack_size_failure_instance;
+static thread_local volatile bool stack_guard_bypassed = false;
+
+static int get_mprotect_flags(void* ctx) {
+    int flags;
+    ucontext_t* context = reinterpret_cast<ucontext_t*>(ctx);
+    if (context->uc_mcontext.gregs[REG_ERR] & 0x2) {
+        flags = PROT_READ | PROT_WRITE;
+    } else {
+        flags = PROT_READ;
+    }
+    return flags;
+}
+
+static void* pagealign(void* ptr, size_t page_size) {
+    static const int pageshift = ffs(page_size) - 1;
+    return reinterpret_cast<void*>(((reinterpret_cast<intptr_t>((ptr)) >> pageshift) << pageshift));
+}
+
+static thread_local struct sigaction default_old_sigsegv_handler;
+
+static void bypass_stack_guard(int sig, siginfo_t* si, void* ctx) {
+    assert(sig == SIGSEGV);
+    int flags = get_mprotect_flags(ctx);
+    stack_guard_bypassed = (flags & PROT_WRITE);
+    if (!stack_guard_bypassed) {
+        return;
+    }
+    size_t page_size = getpagesize();
+    auto mp_result = mprotect(pagealign(si->si_addr, page_size), page_size, PROT_READ | PROT_WRITE);
+    assert(mp_result == 0);
+}
+
+// This test will fail with a regular stack size, because we only probe
+// around 10KiB of data, and the stack guard resides after 128'th KiB.
+seastar::future<> test_thread_custom_stack_size_failure::run_test_case() const {
+    if (RUNNING_ON_VALGRIND) {
+        return make_ready_future<>();
+    }
+
+    sstring x = "x";
+    sstring y = "y";
+
+    // Catch segmentation fault once:
+    struct sigaction sa{};
+    sa.sa_sigaction = &bypass_stack_guard;
+    sa.sa_flags = SA_SIGINFO;
+    auto ret = sigaction(SIGSEGV, &sa, &default_old_sigsegv_handler);
+    if (ret) {
+        throw std::system_error(ret, std::system_category());
+    }
+
+    auto concat = [] (sstring x, sstring y) {
+        sleep(10ms).get();
+        // Probe the stack by writing to it in intervals of 1024,
+        // until we hit a write fault. In order not to ruin anything,
+        // the "write" uses data it just read from the address.
+        volatile char* mem = reinterpret_cast<volatile char*>(&x);
+        for (int i = 0; i < 20; ++i) {
+            mem[i*-1024] = char(mem[i*-1024]);
+            if (stack_guard_bypassed) {
+                break;
+            }
+        }
+        return x + y;
+    };
+    thread_attributes attr;
+    attr.stack_size = 16384;
+    return async(attr, concat, x, y).then([] (sstring xy) {
+        BOOST_REQUIRE_EQUAL(xy, "xy");
+        BOOST_REQUIRE(stack_guard_bypassed);
+        auto ret = sigaction(SIGSEGV, &default_old_sigsegv_handler, nullptr);
+        if (ret) {
+            throw std::system_error(ret, std::system_category());
+        }
+    }).then([concat, x, y] {
+        // The same function with a default stack will not trigger
+        // a segfault, because its stack is much bigger than 10KiB
+        return async(concat, x, y).then([] (sstring xy) {
+            BOOST_REQUIRE_EQUAL(xy, "xy");
+        });
+    });
+}
+#endif // SEASTAR_THREAD_STACK_GUARDS && __x86_64__