[gcc r12-794] TSAN: add new test

[gcc r12-794] TSAN: add new test

[Martin Liska]

https://gcc.gnu.org/g:80b4ce1a5190ebe764b1009afae57dcef45f92c2

commit r12-794-g80b4ce1a5190ebe764b1009afae57dcef45f92c2
Author: Michael de Lang <kingoipo@gmail.com>
Date:   Fri May 14 12:09:45 2021 +0200

    TSAN: add new test
    
    gcc/testsuite/ChangeLog:
    
            * g++.dg/tsan/pthread_cond_clockwait.C: New test.

Diff:
---
 gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C | 31 ++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C b/gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C
new file mode 100644
index 00000000000..82d6a5c8329
--- /dev/null
+++ b/gcc/testsuite/g++.dg/tsan/pthread_cond_clockwait.C
@@ -0,0 +1,31 @@
+// Test pthread_cond_clockwait not generating false positives with tsan
+// { dg-do run { target { { *-*-linux* *-*-gnu* *-*-uclinux* } && pthread } } }
+// { dg-options "-fsanitize=thread -lpthread" }
+
+#include <pthread.h>
+
+pthread_cond_t cv;
+pthread_mutex_t mtx;
+
+void *fn(void *vp) {
+    pthread_mutex_lock(&mtx);
+    pthread_cond_signal(&cv);
+    pthread_mutex_unlock(&mtx);
+    return NULL;
+}
+
+int main() {
+    pthread_mutex_lock(&mtx);
+
+    pthread_t tid;
+    pthread_create(&tid, NULL, fn, NULL);
+
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    ts.tv_sec += 10;
+    pthread_cond_clockwait(&cv, &mtx, CLOCK_MONOTONIC, &ts);
+    pthread_mutex_unlock(&mtx);
+
+    pthread_join(tid, NULL);
+    return 0;
+}