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Test to try to track down the alignment problem on Mac 10.9.

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There's no code change here, I'm rearranging member variables of the
trace class and adding a sizeof check to the CriticalSection
class + alignment attribute for the mutex, on Mac only.

TBR=pbos@webrtc.org

Review URL: https://webrtc-codereview.appspot.com/38339004

Cr-Commit-Position: refs/heads/master@{#8540}
git-svn-id: http://webrtc.googlecode.com/svn/trunk@8540 4adac7df-926f-26a2-2b94-8c16560cd09d
This commit is contained in:
tommi@webrtc.org 2015-02-28 00:01:11 +00:00
parent 73acc15c69
commit d31250518a
2 changed files with 19 additions and 2 deletions
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19
webrtc/base/criticalsection.h
View File

@ -22,6 +22,22 @@
#include <pthread.h>
#endif
#if defined(WEBRTC_MAC)
// TODO(tommi): This is a temporary test to see if critical section objects are
// somehow causing pointer co-member variables that follow a critical section
// variable, are somehow throwing off the alignment and causing crash on
// the Mac 10.9 debug bot:
// http://build.chromium.org/p/chromium.mac/builders/Mac10.9%20Tests%20(dbg)
#define _MUTEX_ALIGNMENT __attribute__((__aligned__(8)))
#define _STATIC_ASSERT_CRITICAL_SECTION_SIZE() \
static_assert(sizeof(CriticalSection) % 8 == 0, \
"Bad size of CriticalSection")
#else
#define _MUTEX_ALIGNMENT
#define _STATIC_ASSERT_CRITICAL_SECTION_SIZE()
#endif
#ifdef _DEBUG
#define CS_TRACK_OWNER 1
#endif // _DEBUG
@ -63,6 +79,7 @@ class LOCKABLE CriticalSection {
class LOCKABLE CriticalSection {
public:
CriticalSection() {
_STATIC_ASSERT_CRITICAL_SECTION_SIZE();
pthread_mutexattr_t mutex_attribute;
pthread_mutexattr_init(&mutex_attribute);
pthread_mutexattr_settype(&mutex_attribute, PTHREAD_MUTEX_RECURSIVE);
@ -99,7 +116,7 @@ class LOCKABLE CriticalSection {
}
private:
pthread_mutex_t mutex_;
_MUTEX_ALIGNMENT pthread_mutex_t mutex_;
TRACK_OWNER(pthread_t thread_);
};
#endif // WEBRTC_POSIX

2
webrtc/system_wrappers/source/trace_impl.h
View File

@ -93,12 +93,12 @@ class TraceImpl : public Trace {
void WriteToFile(const char* msg, uint16_t length)
EXCLUSIVE_LOCKS_REQUIRED(crit_);
rtc::CriticalSection crit_;
TraceCallback* callback_ GUARDED_BY(crit_);
uint32_t row_count_text_ GUARDED_BY(crit_);
uint32_t file_count_text_ GUARDED_BY(crit_);
const rtc::scoped_ptr<FileWrapper> trace_file_ GUARDED_BY(crit_);
rtc::CriticalSection crit_;
};
} // namespace webrtc