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Fix race conditions in emlog #17

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Related to #10

Add spinlock to protect emlog_info_list manipulation and new einfo allocation in emlog.c.

  • Add a spinlock to protect emlog_info_list manipulation in create_einfo() and free_einfo().
  • Add a spinlock to protect new einfo allocation in get_einfo() and create_einfo().
  • Initialize the spinlock in the emlog_init() function.

Related to nicupavel#10

Add spinlock to protect `emlog_info_list` manipulation and new einfo allocation in `emlog.c`.

* Add a spinlock to protect `emlog_info_list` manipulation in `create_einfo()` and `free_einfo()`.
* Add a spinlock to protect new einfo allocation in `get_einfo()` and `create_einfo()`.
* Initialize the spinlock in the `emlog_init()` function.
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Co-authored-by: kalvdans <[email protected]>
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