Don't do work inside assert(). Ever.

The Mac crash key manipulation code was intended to be thread-safe through the
provision of a mutex. The mutex operations were done inside an assert().
assert() is a no-op in NDEBUG (release) builds. Therefore, in release builds,
these operations were occurring without being protected by any mutex at all,
and were nowhere near thread-safe.

BUG=chromium:331268
R=rsesek@chromium.org

Review URL: https://breakpad.appspot.com/1034002

git-svn-id: http://google-breakpad.googlecode.com/svn/trunk@1270 4c0a9323-5329-0410-9bdc-e9ce6186880e

1 files changed, 13 insertions, 16 deletions

diff --git a/src/client/ios/Breakpad.mm b/src/client/ios/Breakpad.mm
index c46509e8..3b9f6d3f 100644
--- a/src/client/ios/Breakpad.mm
+++ b/src/client/ios/Breakpad.mm
@@ -31,6 +31,7 @@
 
 #import "client/ios/Breakpad.h"
 
+#include <assert.h>
 #import <Foundation/Foundation.h>
 #include <pthread.h>
 #include <sys/stat.h>
@@ -91,36 +92,32 @@ pthread_mutex_t gDictionaryMutex;
 // ProtectedMemoryLocker will unprotect this block after taking the lock.
 // Its destructor will first re-protect the memory then release the lock.
 class ProtectedMemoryLocker {
-public:
-  // allocator may be NULL, in which case no Protect() or Unprotect() calls
-  // will be made, but a lock will still be taken
+ public:
   ProtectedMemoryLocker(pthread_mutex_t *mutex,
                         ProtectedMemoryAllocator *allocator)
-  : mutex_(mutex), allocator_(allocator) {
+      : mutex_(mutex),
+        allocator_(allocator) {
     // Lock the mutex
-    assert(pthread_mutex_lock(mutex_) == 0);
+    int rv = pthread_mutex_lock(mutex_);
+    assert(rv == 0);
 
     // Unprotect the memory
-    if (allocator_ ) {
-      allocator_->Unprotect();
-    }
+    allocator_->Unprotect();
   }
 
   ~ProtectedMemoryLocker() {
     // First protect the memory
-    if (allocator_) {
-      allocator_->Protect();
-    }
+    allocator_->Protect();
 
     // Then unlock the mutex
-    assert(pthread_mutex_unlock(mutex_) == 0);
+    int rv = pthread_mutex_unlock(mutex_);
+    assert(rv == 0);
   };
 
-private:
-  //  Keep anybody from ever creating one of these things not on the stack.
-  ProtectedMemoryLocker() { }
+ private:
+  ProtectedMemoryLocker();
   ProtectedMemoryLocker(const ProtectedMemoryLocker&);
-  ProtectedMemoryLocker & operator=(ProtectedMemoryLocker&);
+  ProtectedMemoryLocker& operator=(const ProtectedMemoryLocker&);
 
   pthread_mutex_t           *mutex_;
   ProtectedMemoryAllocator  *allocator_;