Diff of /mozglue/linker/Mappable.h [75d3ff] .. [9085df] Maximize Restore

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--- a/mozglue/linker/Mappable.h
+++ b/mozglue/linker/Mappable.h
@@ -265,7 +265,7 @@
   mozilla::ScopedDeleteArray<unsigned char> chunkAvail;
 
   /* Number of chunks that have already been decompressed. */
-  size_t chunkAvailNum;
+  mozilla::Atomic<size_t> chunkAvailNum;
 
   /* Mutex protecting decompression */
   pthread_mutex_t mutex;