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/usr/include/nrn/nmodlmutex.h is in neuron-dev 7.5-1.

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#ifndef nmodlmutex_h
#define nmodlmutex_h

#include <nrnpthread.h>
#if USE_PTHREAD
#include <pthread.h>
extern pthread_mutex_t* _nmodlmutex;
#define _NMODLMUTEXLOCK {if (_nmodlmutex) { pthread_mutex_lock(_nmodlmutex); }}
#define _NMODLMUTEXUNLOCK {if (_nmodlmutex) { pthread_mutex_unlock(_nmodlmutex); }}
#else
#define _NMODLMUTEXLOCK /**/
#define _NMODLMUTEXUNLOCK /**/
#endif

#endif