[llvm-commits] [compiler-rt] r167833 - /compiler-rt/trunk/lib/tsan/lit_tests/write_in_reader_lock.cc

Alexey Samsonov samsonov at google.com
Tue Nov 13 06:05:02 PST 2012


Author: samsonov
Date: Tue Nov 13 08:05:02 2012
New Revision: 167833

URL: http://llvm.org/viewvc/llvm-project?rev=167833&view=rev
Log:
[TSan] Add output test for write under reader lock

Added:
    compiler-rt/trunk/lib/tsan/lit_tests/write_in_reader_lock.cc

Added: compiler-rt/trunk/lib/tsan/lit_tests/write_in_reader_lock.cc
URL: http://llvm.org/viewvc/llvm-project/compiler-rt/trunk/lib/tsan/lit_tests/write_in_reader_lock.cc?rev=167833&view=auto
==============================================================================
--- compiler-rt/trunk/lib/tsan/lit_tests/write_in_reader_lock.cc (added)
+++ compiler-rt/trunk/lib/tsan/lit_tests/write_in_reader_lock.cc Tue Nov 13 08:05:02 2012
@@ -0,0 +1,35 @@
+// RUN: %clangxx_tsan -O1 %s -o %t && %t 2>&1 | FileCheck %s
+#include <pthread.h>
+#include <unistd.h>
+
+pthread_rwlock_t rwlock;
+int GLOB;
+
+void *Thread1(void *p) {
+  (void)p;
+  pthread_rwlock_rdlock(&rwlock);
+  // Write under reader lock.
+  usleep(100);
+  GLOB++;
+  pthread_rwlock_unlock(&rwlock);
+  return 0;
+}
+
+int main(int argc, char *argv[]) {
+  pthread_rwlock_init(&rwlock, NULL);
+  pthread_rwlock_rdlock(&rwlock);
+  pthread_t t;
+  pthread_create(&t, 0, Thread1, 0);
+  volatile int x = GLOB;
+  (void)x;
+  pthread_rwlock_unlock(&rwlock);
+  pthread_join(t, 0);
+  pthread_rwlock_destroy(&rwlock);
+  return 0;
+}
+
+// CHECK: WARNING: ThreadSanitizer: data race
+// CHECK:   Write of size 4 at {{.*}} by thread 1:
+// CHECK:     #0 Thread1(void*) {{.*}}write_in_reader_lock.cc:13
+// CHECK:   Previous read of size 4 at {{.*}} by main thread:
+// CHECK:     #0 main {{.*}}write_in_reader_lock.cc:23





More information about the llvm-commits mailing list