/usr/include/stk/Mutex.h is in libstk0-dev 4.5.2+dfsg-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74  | #ifndef STK_MUTEX_H
#define STK_MUTEX_H
#include "Stk.h"
#if (defined(__OS_IRIX__) || defined(__OS_LINUX__) || defined(__OS_MACOSX__))
  #include <pthread.h>
  typedef pthread_mutex_t MUTEX;
  typedef pthread_cond_t CONDITION;
#elif defined(__OS_WINDOWS__)
  #include <windows.h>
  #include <process.h>
  typedef CRITICAL_SECTION MUTEX;
  typedef HANDLE CONDITION;
#endif
namespace stk {
/***************************************************/
/*! \class Mutex
    \brief STK mutex class.
    This class provides a uniform interface for
    cross-platform mutex use.  On Linux and IRIX
    systems, the pthread library is used. Under
    Windows, critical sections are used.
    by Perry R. Cook and Gary P. Scavone, 1995--2014.
*/
/***************************************************/
class Mutex : public Stk
{
 public:
  //! Default constructor.
  Mutex();
  //! Class destructor.
  ~Mutex();
  //! Lock the mutex.
  void lock(void);
  //! Unlock the mutex.
  void unlock(void);
  //! Wait indefinitely on the mutex condition variable.
  /*!
    The mutex must be locked before calling this function, and then
    subsequently unlocked after this function returns.
   */
  void wait(void);
  //! Signal the condition variable.
  /*!
    The mutex must be locked before calling this function, and then
    subsequently unlocked after this function returns.
   */
  void signal(void);
 protected:
  MUTEX mutex_;
  CONDITION condition_;
};
} // stk namespace
#endif
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