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Following code contains function called SafeSum which is ensuring the consistency of shared data sum. Assume that SafeSum function can be called by several of thread and doesn't allow sum become in inconsistent state. Put pthread_mutex_lock and pthread_mutex_unlock functions into critical sections of following code. pthread_mutex_t mutex = PTHREAD MUTEX INITIALIZER, int sum = 0; /* Global variables / void SafeSum(void) { int i for (i=0; i