Correct NetBSD support in pthread_once(3)/TSan

Summary:
The pthread_once(3)/NetBSD type is built with the following structure:

struct __pthread_once_st {
 pthread_mutex_t pto_mutex;
 int pto_done;
};

Set the pto_done position as shifted by __sanitizer::pthread_mutex_t_sz
from the beginning of the pthread_once struct.

This corrects deadlocks when the pthread_once(3) function
is used.

Sponsored by <The NetBSD Foundation>

Reviewers: joerg, dvyukov, vitalybuka

Reviewed By: dvyukov

Subscribers: llvm-commits, kubamracek, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D40262

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@318742 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 1 insertions, 0 deletions

diff --git a/lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc b/lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc
index b973f0d6d..108e196e7 100644
--- a/lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc
+++ b/lib/sanitizer_common/sanitizer_platform_limits_netbsd.cc
@@ -83,6 +83,7 @@ unsigned siginfo_t_sz = sizeof(siginfo_t);
 unsigned struct_sigaction_sz = sizeof(struct sigaction);
 unsigned struct_itimerval_sz = sizeof(struct itimerval);
 unsigned pthread_t_sz = sizeof(pthread_t);
+unsigned pthread_mutex_t_sz = sizeof(pthread_mutex_t);
 unsigned pthread_cond_t_sz = sizeof(pthread_cond_t);
 unsigned pid_t_sz = sizeof(pid_t);
 unsigned timeval_sz = sizeof(timeval);