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    <head>
      <base href="https://bugs.llvm.org/">
    </head>
    <body><table border="1" cellspacing="0" cellpadding="8">
        <tr>
          <th>Bug ID</th>
          <td><a class="bz_bug_link 
          bz_status_NEW "
   title="NEW - Multiple processes can write to the same gcda files at the same time on Windows"
   href="https://bugs.llvm.org/show_bug.cgi?id=34923">34923</a>
          </td>
        </tr>

        <tr>
          <th>Summary</th>
          <td>Multiple processes can write to the same gcda files at the same time on Windows
          </td>
        </tr>

        <tr>
          <th>Product</th>
          <td>new-bugs
          </td>
        </tr>

        <tr>
          <th>Version</th>
          <td>5.0
          </td>
        </tr>

        <tr>
          <th>Hardware</th>
          <td>PC
          </td>
        </tr>

        <tr>
          <th>OS</th>
          <td>Windows NT
          </td>
        </tr>

        <tr>
          <th>Status</th>
          <td>NEW
          </td>
        </tr>

        <tr>
          <th>Severity</th>
          <td>enhancement
          </td>
        </tr>

        <tr>
          <th>Priority</th>
          <td>P
          </td>
        </tr>

        <tr>
          <th>Component</th>
          <td>new bugs
          </td>
        </tr>

        <tr>
          <th>Assignee</th>
          <td>unassignedbugs@nondot.org
          </td>
        </tr>

        <tr>
          <th>Reporter</th>
          <td>mcastelluccio@mozilla.com
          </td>
        </tr>

        <tr>
          <th>CC</th>
          <td>llvm-bugs@lists.llvm.org
          </td>
        </tr></table>
      <p>
        <div>
        <pre>flock is a no-op on Windows
(<a href="https://github.com/llvm-mirror/compiler-rt/blob/d89810afdc2862ea865f5c297ef4ea5839941d25/lib/profile/WindowsMMap.c#L122">https://github.com/llvm-mirror/compiler-rt/blob/d89810afdc2862ea865f5c297ef4ea5839941d25/lib/profile/WindowsMMap.c#L122</a>),
which means the gcda files can get corrupted if multiple processes are writing
them at the same time.</pre>
        </div>
      </p>


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