// class for mutual exclusion using the CPS-library of the CONVEX#include <cps.h>#include <errno.h>class leda_mutex {  leda_mutex(const leda_mutex& m)   { cps_mutex_alloc(&lock_);}   leda_mutex operator=(const leda_mutex& m)   { cps_mutex_alloc(&lock_); return *this; }public:  leda_mutex() { cps_mutex_alloc (&lock_); } ~leda_mutex() { cps_mutex_free (&lock_);  }  void acquire() { cps_mutex_lock (&lock_); }  void lock()    { cps_mutex_lock (&lock_); }  void enter()   { cps_mutex_lock (&lock_); }  void release() { cps_mutex_unlock (&lock_); }  void unlock()  { cps_mutex_unlock (&lock_); }  void exit()    { cps_mutex_unlock (&lock_); }  int trylock()  { return cps_mutex_trylock (&lock_); }  int tryenter() { return cps_mutex_trylock (&lock_); }  private:  cps_mutex_t lock_;};