[compiler-rt] [TSAN] add instrumentation for pthread_mutex_clocklock (PR #75712)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-compiler-rt-sanitizer

Author: Yvan (Yvan-xy)

<details>
<summary>Changes</summary>

The function `pthread_mutex_clocklock` is not supported by TSAN yet, which is mentioned by[ llvm/llvm-project/issues/62623](https://github.com/llvm/llvm-project/issues/62623#issue-1701600538). This patch is to handle this function.

---
Full diff: https://github.com/llvm/llvm-project/pull/75712.diff


2 Files Affected:

- (modified) compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp (+15) 
- (added) compiler-rt/test/tsan/pthread_mutex_clocklock.cpp (+29) 


``````````diff
diff --git a/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp b/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
index 80f86ca98ed9cd..7f546d6120c346 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_interceptors_posix.cpp
@@ -1380,6 +1380,20 @@ TSAN_INTERCEPTOR(int, pthread_mutex_unlock, void *m) {
   return res;
 }
 
+TSAN_INTERCEPTOR(int, pthread_mutex_clocklock, void *m, 
+                __sanitizer_clockid_t clock, void *abstime) {
+  SCOPED_TSAN_INTERCEPTOR(pthread_mutex_clocklock, m, clock, abstime);
+  MutexPreLock(thr, pc, (uptr)m);
+  int res = REAL(pthread_mutex_clocklock)(m, clock, abstime);
+  if (res == errno_EOWNERDEAD)
+    MutexRepair(thr, pc, (uptr)m);
+  if (res == 0 || res == errno_EOWNERDEAD)
+    MutexPostLock(thr, pc, (uptr)m);
+  if (res == errno_EINVAL)
+    MutexInvalidAccess(thr, pc, (uptr)m);
+  return res;
+}
+
 #if SANITIZER_GLIBC
 #  if !__GLIBC_PREREQ(2, 34)
 // glibc 2.34 applies a non-default version for the two functions. They are no
@@ -2902,6 +2916,7 @@ void InitializeInterceptors() {
   TSAN_INTERCEPT(pthread_mutex_trylock);
   TSAN_INTERCEPT(pthread_mutex_timedlock);
   TSAN_INTERCEPT(pthread_mutex_unlock);
+  TSAN_INTERCEPT(pthread_mutex_clocklock);
 #if SANITIZER_GLIBC
 #  if !__GLIBC_PREREQ(2, 34)
   TSAN_INTERCEPT(__pthread_mutex_lock);
diff --git a/compiler-rt/test/tsan/pthread_mutex_clocklock.cpp b/compiler-rt/test/tsan/pthread_mutex_clocklock.cpp
new file mode 100644
index 00000000000000..dbca0b42039181
--- /dev/null
+++ b/compiler-rt/test/tsan/pthread_mutex_clocklock.cpp
@@ -0,0 +1,29 @@
+// RUN: %clang_tsan -O1 %s -o %t && %run %t 2>&1 | FileCheck %s
+// UNSUPPORTED: darwin
+#include <pthread.h>
+#include <stdio.h>
+
+pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
+struct timespec ts = {0};
+
+void *tfunc(void *p) {
+  if (!pthread_mutex_trylock(&m)) {
+    puts("Second thread could not lock mutex");
+    pthread_mutex_unlock(&m);
+  }
+  return p;
+}
+
+int main() {
+  if (!pthread_mutex_clocklock(&m, CLOCK_REALTIME, &ts)) {
+    pthread_t thr;
+    pthread_create(&thr, 0, tfunc, 0);
+    pthread_join(thr, 0);
+    pthread_mutex_unlock(&m);
+  } else
+    puts("Failed to lock mutex");
+  fprintf(stderr, "PASS\n");
+}
+
+// CHECK-NOT: WARNING: ThreadSanitizer: unlock of an unlocked mutex
+// CHECK: PASS
\ No newline at end of file

``````````

</details>


https://github.com/llvm/llvm-project/pull/75712