gold: fix race in FileRead::~View.

gold/:
	* fileread.cc (file_counts_lock, file_counts_initialize_lock)
	(total_mapped_bytes, current_mapped_bytes, maximum_mapped_bytes):
	Move definition before File_read::View member definitions.
	(File_read::View::~View): Initialize and hold lock before
	updating current_mapped_bytes.

1 files changed, 17 insertions, 10 deletions

diff --git a/gold/fileread.cc b/gold/fileread.cc
index a16738a0d59..14a02b2f52f 100644
--- a/gold/fileread.cc
+++ b/gold/fileread.cc
@@ -57,6 +57,17 @@ readv(int, const iovec*, int)
 namespace gold
 {
 
+// Class File_read.
+
+// A lock for the File_read static variables.
+static Lock* file_counts_lock = NULL;
+static Initialize_lock file_counts_initialize_lock(&file_counts_lock);
+
+// The File_read static variables.
+unsigned long long File_read::total_mapped_bytes;
+unsigned long long File_read::current_mapped_bytes;
+unsigned long long File_read::maximum_mapped_bytes;
+
 // Class File_read::View.
 
 File_read::View::~View()
@@ -70,7 +81,12 @@ File_read::View::~View()
     case DATA_MMAPPED:
       if (::munmap(const_cast<unsigned char*>(this->data_), this->size_) != 0)
         gold_warning(_("munmap failed: %s"), strerror(errno));
-      File_read::current_mapped_bytes -= this->size_;
+      if (!parameters->options_valid() || parameters->options().stats())
+	{
+	  file_counts_initialize_lock.initialize();
+	  Hold_optional_lock hl(file_counts_lock);
+	  File_read::current_mapped_bytes -= this->size_;
+	}
       break;
     case DATA_NOT_OWNED:
       break;
@@ -100,15 +116,6 @@ File_read::View::is_locked()
 
 // Class File_read.
 
-// A lock for the File_read static variables.
-static Lock* file_counts_lock = NULL;
-static Initialize_lock file_counts_initialize_lock(&file_counts_lock);
-
-// The File_read static variables.
-unsigned long long File_read::total_mapped_bytes;
-unsigned long long File_read::current_mapped_bytes;
-unsigned long long File_read::maximum_mapped_bytes;
-
 File_read::~File_read()
 {
   gold_assert(this->token_.is_writable());